Tue·May 2, 2023Tuesday·May 2, 2023

1. 01*

   Measuring Inflaton Couplings via Primordial Gravitational Waves

   Basabendu Barman🇵🇱 · Anish Ghoshal🇵🇱 · Bohdan Grzadkowski🇵🇱 · Anna Socha🇵🇱

   We investigate the reach of future gravitational wave (GW) detectors in probing inflaton couplings with visible sector particles that can either be bosonic or fermionic in nature. Assuming reheating takes place through perturbative quantum production from vacuum in presence of classical inflaton background field, we find that the spectral energy density of the primordial GW generated during inflation becomes sensitive to inflaton-matter coupling. We conclude, obeying bounds from Big Bang Nucleosysthesis and Cosmic Microwave Background, that, e.g., inflaton-scalar couplings of the order of $\sim \mathcal{O}(10^{-20})$ GeV fall within the sensitivity range of several proposed GW detector facilities. However, this prediction is sensitive to the size of the inflationary scale, nature of the inflaton-matter interaction and shape of the potential during reheating. Having found the time-dependent effective inflaton decay width, we also discuss its implications for dark matter (DM) production from the thermal plasma via UV freeze-in during reheating. It is shown, that one can reproduce the observed DM abundance for its mass up to several PeVs, depending on the dimension of the operator connecting DM with the thermal bath and the associated scale of the UV physics. Thus we promote primordial GW to observables sensitive to feebly coupled inflaton, which is very challenging if not impossible to test in conventional particle physics laboratories or astrophysical measurements.

   hep-phastro-ph.COJHEP(2023)·39 citations
2. 02*

   Minimally modified Fritzsch texture for quark masses and CKM mixing

   Benedetta Belfatto🇮🇹 · Zurab Berezhiani🇮🇹

   The Standard Model does not constrain the form of the Yukawa matrices and thus the origin of fermion mass hierarchies and mixing pattern remains puzzling. On the other hand, there are intriguing relations between fermion masses and mixing angles which may point towards specific textures of Yukawa matrices. One of the classic hypothesis is the zero texture proposed by Fritzsch which is, however, excluded by present precision tests since it predicts a too large value of $|V_{cb}|$ as well as a too small value of the ratio $|V_{ub}/V_{cb}|$. In this paper we discuss a minimal modification which still maintains the six zero entries as in the original Fritzsch ansatz. This modification consists in introducing an asymmetry between the 23 and 32 entries in the down-quark Yukawa matrix. We show that this flavour structure can naturally emerge in the context of models with inter-family $SU(3{)}_H$ symmetry. We present a detailed analysis of this Fritzsch-like texture by testing its predictions and showing that it is perfectly compatible with the present precision data on quark masses and CKM mixing matrix.

   hep-phJHEP(2023)·11 citations
3. 03*

   Corrections of $Z^{\prime }$ to the Magnetic Moment of the Muon

   Jorge Gamboa🇨🇱 · Justo López-Sarrión🇪🇸 · Fernando Méndez🇨🇱 · Natalia Tapia Arellano🇺🇸

   We go through several previous corrections and contributions to the muon $g-2$, starting from the dark photon hypothesis to the dark Z. We explore the inputs from a dark Z boson virtual mediator in a first order loop. We consider not only the QED like contributions in the theory but also weak interactions. We obtain a new factor that adds corrections to the form factor associated with the anomalous magnetic moment. We show our result is favorable in new unexplored windows in the mass-coupling parameter space.

   hep-phPRD(2023)·1 citation
4. 04*

   Chiral symmetry restoration in a rotating medium

   Irving I. Gaspar🇲🇽 · Luis A. Hernández🇲🇽 · Renato Zamora🇨🇱

   We study the nature of the chiral symmetry restoration within the Yukawa model with spontaneous symmetry breaking. We work with scalar and fermion fields which are subject to the effects of a rotating system. In this work, we show the derivation of the scalar field propagator in a rotating medium using the Fock-Schwinger proper-time method. We compute analytically the effective potential in the high-temperature approximations, including the contribution of the ring diagrams to account for the plasma screening properties. We study the chiral transition as we vary the angular velocity $\Omega$, the boson self-coupling $\lambda$ and the fermion-boson coupling $g$. We show that the critical temperature for the restoration of chiral symmetry always starts with decreasing behaviour, until it reaches a minimum and from there when increasing $\Omega$, we observe $T_c$ increases monotonically. In all the phase transition lines in the $T-\Omega$ plane reported, we obtain that the rotating effects are able to change the order of the phase transition.

   hep-phhep-thnucl-thPRD(2023)·20 citations
5. 05*

   Novel method for identifying the heaviest QED atom

   Jing-Hang Fu🇨🇳 · Sen Jia🇨🇳 · Xing-Yu Zhou🇨🇳 · Yu-Jie Zhang🇨🇳 · Cheng-Ping Shen🇨🇳 · Chang-Zheng Yuan🇨🇳

   The bound state of a ${\tau }^{+}{\tau }^{-}$ pair by the electromagnetic force is the heaviest and smallest QED atom. Since the discovery of the two lightest QED atoms more than 60 years ago, no evidence for the third one has been found. We demonstrate that the $J_{\tau }$ (${\tau }^{+}{\tau }^{-}$ atom with $J^{PC}=1^{--}$) resonance signal can be observed with a significance larger than $5\sigma$ including both statistical and systematic uncertainties, via the process $e^{+}{e}^{-}\to X^{+}{Y}^{-}\text{slashed}E$ ($X,Y=e$, $\mu$, $\pi$, $K$, or $\rho$, and $\text{slashed}E$ is the missing energy) with $1.5\mathrm{a}{\mathrm{b}}^{-1}$ data taken around the $\tau$ pair production threshold. The $\tau$ lepton mass can be measured in a precision of 2 keV with the same data sample. This is within one year's running time of the proposed super tau-charm factory or super charm-tau factory.

   hep-phhep-exSci.Bull.(2024)·6 citations
6. 06*

   Spatial correlations of charm and anticharm quarks at hadronisation

   M. Gazdzicki (1)🇵🇱 · D. Kikola (2)🇵🇱 · I. Pidhurskyi (1, 3)🇵🇱 · L. Tinti (1) ((1) Jan Kochanowski University, Kielce, Poland, (2) Warsaw University of Technology, Warsaw, Poland, (3) European Organization for Nuclear Research, CERN, Geneva, Switzerland)🇵🇱

   Heavy-ion collisions are a unique tool for studying properties of strong interactions at high energy densities. In particular, the momentum correlations of charm and bottom hadrons have been considered for testing heavy quark thermalisation in the dense matter produced by the collisions. In this respect, two effects have been considered: the decrease of the initial back-to-back correlations and the increase of correlations due to heavy-quark interactions with the collectively flowing medium. Here, we show that information on the spatial correlations of the charm-anticharm quarks at the hadronisation can be extracted by measuring the momentum correlation of charm and anticharm hadrons produced in central collisions of two heavy nuclei. This, however, requires collisions with a single charm-anticharm quark pair created - the condition likely to be fulfilled in central Pb+Pb collisions at the CERN SPS energies. We introduce a method to correct the measured joint distribution function for the smearing of the charm and anticharm hadron momenta caused by hadronisation. Then the results are directly sensitive to the spatial correlations at the hadronisation. Using an example of central Pb+Pb collisions at the CERN SPS energies, we demonstrate that even a limited statistics of charm-anticharm hadron pairs can distinguish between different spatial correlation functions of charm-anticharm quarks at hadronisation. The results on spatial charm-anticharm quark correlations will provide a unique test of different assumptions on heavy quark creation in space-time and transport in dense, strongly interacting matter. We show that the existing detector technology and beam intensities at the CERN SPS should allow us to conduct the needed experiments soon.

   hep-phCommun.Phys.(2025)·6 citations
7. 07*

   Single-photon decays in systems with at least one heavy quark

   Marek Karliner🇮🇱 · Jonathan L. Rosner🇺🇸

   Hadrons containing at least one heavy quark (charm or bottom) frequently have small enough natural widths that decay modes involving a single photon have detectable branching fractions. Photons of typical energy greater than 100 MeV have been directly detected, while those of lower energy have only been inferred. Here we discuss prospects for observing direct sub-100 MeV photons in specific radiative decays of charmed and bottom vector mesons, as well as a spin-excited heavy baryon.

   hep-ph1 citation
8. 08*

   Bayesian Inference of Supernova Neutrino Spectra with Multiple Detectors

   Xu-Run Huang🇨🇳 · Chuan-Le Sun🇨🇳 · Lie-Wen Chen🇨🇳 · Jun Gao🇨🇳

   We implement the Bayesian inference to retrieve energy spectra of all neutrinos from a galactic core-collapse supernova (CCSN). To achieve high statistics and full sensitivity to all flavours of neutrinos, we adopt a combination of several reaction channels from different large-scale neutrino observatories, namely inverse beta decay on proton and elastic scattering on electron from Hyper-Kamiokande (Hyper-K), charged current absorption on Argon from Deep Underground Neutrino Experiment (DUNE) and coherent elastic scattering on Lead from RES-NOVA. Assuming no neutrino oscillation or specific oscillation models, we obtain mock data for each channel through Poisson processes with the predictions, for a typical source distance of 10 kpc in our Galaxy, and then evaluate the probability distributions for all spectral parameters of theoretical neutrino spectrum model with Bayes' theorem. Although the results for either the electron-neutrinos or electron-antineutrinos reserve relatively large uncertainties (according to the neutrino mass hierarchy), a precision of a few percent (i.e., $\pm 1\%\sim \pm 4\%$ at a credible interval of $2\sigma$) is achieved for primary spectral parameters (e.g., mean energy and total emitted energy) of other neutrino species. Moreover, the correlation coefficients between different parameters are computed as well and interesting patterns are found. Especially, the mixing-induced correlations are sensitive to the neutrino mass hierarchy, which potentially makes it a brand new probe to determine the neutrino mass hierarchy in the detection of galactic supernova neutrinos. Finally, we discuss the origin of such correlation patterns and perspectives for further improvement on our results.

   hep-phastro-ph.HEnucl-exnucl-thJCAP(2023)·10 citations
9. 09*

   Estimation of collision centrality in terms of the number of participating nucleons in heavy-ion collisions using deep learning

   Dipankar Basak🇮🇳 · Kalyan Dey🇮🇳

   The deep learning technique has been applied for the first time to investigate the possibility of centrality determination in terms of the number of participants ($N_{\mathrm{part}}$) in high-energy heavy-ion collisions. For this purpose, supervised learning using both deep neural network (DNN) and convolutional neural network (CNN) is performed with labeled data obtained by modeling relativistic heavy-ion collisions utilizing A Multi-phase Transport Model (AMPT). Event-by-event distributions of pseudorapidity and azimuthal angle of charged hadrons weighted by their transverse momentum are used as input to train the DL models. The DL models did remarkably well in predicting $N_{\mathrm{part}}$ values with CNN slightly outperforming the DNN model. The Mean Squared Logarithmic Error (MSLE) for the CNN model (Model-4) is determined to be 0.0592 for minimum bias collisions and 0.0114 for 0-60\% centrality class, indicating that the model performs better for semi-central and central collisions. Furthermore, the studied DL model is proven to be robust to changes in energy as well as model parameters of the input. The current study demonstrates that the data-driven technique has a distinct potential for determining centrality in terms of the number of participants in high-energy heavy-ion collision experiments.

   hep-phnucl-thEPJA(2023)·5 citations
10. 10*

    (pseudo)Scalar mesons in a self-consistent NJL model

    Xiaozhu Yu🇨🇳 · Xinyang Wang🇨🇳

    In this study, we investigate the mass spectrum of $\pi$ and $\sigma$ mesons at finite chemical potential using the self-consistent NJL model and the Fierz-transformed interaction Lagrangian. The model introduces an arbitrary parameter $\alpha$ to reflect the weights of the Fierz-transformed interaction channels. We show that when $\alpha$ exceeds a certain threshold value, the chiral phase transition transforms from a first-order one to a smooth crossover, which is evident from the behaviors of the chiral condensates and meson masses. Additionally, at high chemical potential, the smaller the value of $\alpha$, the higher the masses of the $\pi$ and $\sigma$ mesons become. Moreover, the Mott and dissociation chemical potentials both increase with the increase in $\alpha$. Thus, the meson mass emerges as a valuable experimental observable for determining the value of $\alpha$ and investigating the properties of the chiral phase transition in dense QCD matter.

    hep-phCPC(2023)·2 citations
11. 11*

    Starobinsky-Type B-L Higgs Inflation Leading Beyond MSSM

    C. Pallis🇬🇷

    Models of induced-gravity inflation are formulated within Supergravity employing as inflaton the Higgs field which leads to a spontaneous breaking of a U(1)_{B-L} symmetry at Mgut=2x10^16 GeV. We use a renormalizable superpotential, fixed by a U(1) R symmetry, and logarithmic or semi-logarithmic Kahler potentials with integer prefactors which exhibit a quadratic non-minimal coupling to gravity. We find inflationary solutions of Starobinsky type in accordance with the observations. The inflaton mass is predicted to be of the order of 10^13 GeV. The model can be nicely linked to MSSM offering an explanation of the magnitude of the mu parameter consistently with phenomenological data. Also it allows for baryogenesis via non-thermal leptogenesis, provided that the gravitino is heavier than about 10 TeV.

    hep-phastro-ph.COhep-thPoS(2023)·4 citations
12. 12*

    Theory of the deconfinement process in QCD

    M.S. Lukashov🇷🇺 · Yu.A. Simonov🇷🇺

    The phenomenon of the deconfinement -- the spectacular drop of the colorelectric string tension at the critical temperature $T_c$ -- is studied within the method of field correlators (FCM) taking into account directly the contribution of the gluon condensate into the hadronic free energy. Using the resulting expressions for the free energy as a sum of the gluon condensate (the vacuum energy) and the hadronic pressure one obtains the possibility to calculate the deconfinement temperature $T_c$ and the temperature behavior of the string tension ${\sigma }_E(T)$ and the gluonic condensate $G_2(T)$ below $T_c$. The connection between the string tension and the quark condensate found in the framework of FCM allows the predict also the latter as a function of $T$ . These results are compared to the known lattice data of $T_c$, ${\sigma }_E(T)$, $⟨\bar{q}q⟩(T)$ for hadronic media with different $n_f$ and $m_q$ and in the external magnetic field $eB$. The good agreement of the results of this approach with lattice data is demonstrated.

    hep-phhep-exhep-latPhys.Atom.Nucl.(2023)·4 citations
13. 13*

    Observable proton decay and gauge coupling unification in the improved missing doublet SU(5) model

    Maria Mehmood🇵🇰 · Mansoor Ur Rehman🇵🇰

    We investigate the possibility of observable proton decay within the improved missing doublet model (IMDM75), which utilizes a Higgs in 75 representation for $SU(5)$ gauge symmetry breaking. The realization of observable proton decay in IMDM75 is made feasible primarily due to chirality nonflipping color-triplet mediation, while chirality flipping mediation is adequately suppressed. Our predictions suggest a range of proton lifetimes between $10^{34}-10^{36}$ yr, which can be observed in upcoming experiments such as Hyper-K and DUNE, for a corresponding range of color-triplet mass parameter $M_T$ in the order of $10^{11}-10^{14}$GeV. IMDM75 is shown to offer unique predictions for branching ratios when compared to other grand unified theory models. Finally, a realization of successful gauge coupling unification is achieved, even with the presence of particles at intermediate scales.

    hep-phPRD(2023)·5 citations
14. 14*

    Hint of a new scalar interaction in LHCb data?

    Alakabha Datta🇺🇸 · Danny Marfatia🇺🇸 · Lopamudra Mukherjee🇨🇳

    We explain recent LHCb measurements of the lepton universality ratios, $R_{D^{(\ast )}}^{\tau /\ell }\equiv \frac{\mathcal{B}(\bar{B}\to D^{(\ast )+}{\tau }^{-}{\bar{\nu }}_{\tau })}{\mathcal{B}(\bar{B}\to D^{(\ast )+}{\ell }^{-}{\bar{\nu }}_{\ell })}$ and ${R({\Lambda }_c^{+})}^{\tau /\ell }\equiv \frac{\mathcal{B}({\Lambda }_b\to {\Lambda }_c^{+}{\tau }^{-}{\bar{\nu }}_{\tau })}{\mathcal{B}({\Lambda }_b\to {\Lambda }_c^{+}{\ell }^{-}{\bar{\nu }}_{\ell })}$ with $\ell =\mu$, via new physics that affects $R_D^{\tau /\ell }$ and $R({\Lambda }_c^{+}{)}^{\tau /\ell }$ but not $R_{D^{\ast }}^{\tau /\ell }$. The scalar operator in the effective theory for new physics is indicated. We find that the forward-backward asymmetry and $\tau$ polarization in $\bar{B}\to D^{+}{\tau }^{-}{\bar{\nu }}_{\tau }$ and ${\Lambda }_b\to {\Lambda }_c^{+}{\tau }^{-}{\bar{\nu }}_{\tau }$ decays are significantly affected by the scalar interaction. We construct a simple two Higgs doublet model as a realization of our scenario and consider lepton universality in semileptonic charm and top decays, radiative $B$ decay, $B$-mixing, and $Z\to b\bar{b}$.

    hep-phhep-exEPJC(2024)·2 citations
15. 15*

    The doubly-charmed pentaquark in a quark model with a complete set of harmonic oscillator bases

    Woosung Park🇰🇷 · Sungsik Noh🇰🇷

    As our recent quark model calculation~\cite{Noh:2023fdy} suggests a strong possibility of a compact $T_{cc}$ that closely reproduces experimental mass, we have a strong incentive to extend our work to investigate the possible compact configuration of a pentaquark $udcc\bar{s}$, which is related to the structure of the doubly charmed tetraquark $T_{cc}$. Since the introduction of a complete set of 3-dimensional harmonic oscillator bases to a spatial wave function in solving a quark model-based Hamiltonian with variational method leads to a more accurate value of the mass, it seems natural that future studies of the pentaquark should be treated with the same elaborate technical approach. To attain such precision for the ground state energy, we utilize a complete set of 3-dimensional harmonic oscillator base up to 6th quanta. Before carrying out this process, one important thing that has to be taken into account is to find out the color $\otimes$ spin states of the pentaquark for the evaluation of color and spin interaction most essential to the quark model configuration. To easily identify the suitable configuration, we make a systematic analysis of $SU(6{)}_{CS}$ irreducible representation of the pentaquark, from which we find that there is a correspondence between the color $\otimes$ spin states obtained from their coupling scheme and the multiplet of the $SU(6{)}_{CS}$ irreducible representation of the pentaquark. We find that the energy of the pentaquark configuration is +18.5 MeV above the lowest threshold for decay into ${\Xi }_{cc}$ and $K$, suggesting that this configuration is not stable against its decay. Nonetheless, while we used a Gaussian hyperfine potential, it was recently found that a Yukawa form leads to a stronger attraction for the $T_{cc}$ configuration. Therefore it is important to study the same configuration using the latter potential.

    hep-phPRD(2023)·5 citations
16. 16*

    Probing the electroweak $4b+\ell +\text{/}{E}_T$ final state in type I 2HDM at the LHC

    Prasenjit Sanyal🇰🇷 · Daohan Wang🇰🇷

    Most of the experimental searches of the non-Standard Model Higgs boson(s) at the LHC rely on the QCD induced production modes. However, in some beyond Standard Model frameworks, the additional Higgs bosons can have fermiophobic behaviour. The type I two Higgs doublet model considered here is a perfect example where all the additional Higgs bosons exhibit fermiophobic nature over a large region of parameter space. Thus the electroweak productions of these new Higgs bosons are more dominant over the QCD induced processes. In scenarios with light pseuodoscalar ($A$) which is bound to decay dominantly to $b\bar{b}$, even being fermiophobic, the $4b+W$ state via $pp\to H^{\pm }A\to (AW)A\to 4b+W$ and followed by the leptonic decay of $W$ boson can surpass the QCD initiated $4b$ final state. However, the signal gets overshadowed by large $t\bar{t}+$jets background and hence constructing a suitable discriminator based on the signal hypothesis and signal topology is necessary. We devised a ${\chi }^2$ variable as the most suitable signal-background discrimintor to reduce the background by a sizable amount and showed the discovery reach ( $>3\sigma$) of the electroweak initiated $4b+\ell +\text{/}{E}_T$ final state at the LHC.

    hep-phhep-exJHEP(2023)·10 citations
17. 17*

    Study of singly heavy baryon lifetimes

    Hai-Yang Cheng🇹🇼 · Chia-Wei Liu🇨🇳

    We study the inclusive decay widths of singly heavy baryons with the improved bag model in which the unwanted center-of-mass motion is removed. Additional insight is gained by comparing the charmed and bottom baryons. We discuss the running of the baryon matrix elements and compare the results with the non-relativistic quark model (NRQM). While the calculated two-quark operator elements are compatible with the literature, those of the four-quark ones deviate largely. In particular, the heavy quark limit holds reasonably well in the bag model for four-quark operator matrix elements but is badly broken in the NRQM. We predict $1-\tau ({\Omega }_b)/\tau ({\Lambda }_b^0)=(8.34\pm 2.22)\%$ in accordance with the current experimental value of $(11.5_{-11.6}^{+12.2})\%$ and compatible with $(13.2\pm 4.7)\%$ obtained in the NRQM. We find an excellent agreement between theory and experiment for the lifetimes of bottom baryons. We confirm that ${\Omega }_c^0$ could live longer than ${\Lambda }_c^{+}$ after the dimension-7 four-quark operators are taken into account. We recommend to measure some semileptonic inclusive branching fractions in the forthcoming experiments to discern different approaches. For example, we obtain $\mathcal{B}\mathcal{F}({\Xi }_c^{+}\to X{e}^{+}{\nu }_e)=(8.57\pm 0.49)\%$ and $\mathcal{B}\mathcal{F}({\Omega }_c^0\to X{e}^{+}{\nu }_e)=(1.88\pm 1.69)\%$ in sharp contrast to $\mathcal{B}\mathcal{F}({\Xi }_c^{+}\to X{e}^{+}{\nu }_e)=(12.74_{-2.45}^{+2.54})\%$ and $\mathcal{B}\mathcal{F}({\Omega }_c^0\to X{e}^{+}{\nu }_e)=(7.59_{-2.24}^{+2.49})\%$ found in the NRQM.

    hep-phhep-exJHEP(2023)·18 citations
18. 18*

    CKM matrix parameters from the exceptional Jordan algebra

    Aditya Ankur Patel🇮🇳 · Tejinder P. Singh🇮🇳

    We report a theoretical derivation of the Cabibbo-Kobayashi-Maskawa (CKM) matrix parameters and the accompanying mixing angles. These results are arrived at from the exceptional Jordan algebra applied to quark states, and from expressing flavor eigenstates (i.e. left-chiral states) as superposition of mass eigenstates (i.e. the right-chiral states) weighted by square-root of mass. Flavor mixing for quarks is mediated by the square-root mass eigenstates, and the mass ratios used have been derived in earlier work from a left-right symmetric extension of the standard model. This permits a construction of the CKM matrix from first principles. There exist only four normed division algebras, they can be listed as follows - the real numbers $\mathbb{R}$, the complex numbers $\mathbb{C}$, the quaternions $\mathbb{H}$ and the octonions $\mathbb{O}$. The first three algebras are fairly well known; however, octonions as algebra are less studied. Recent research has pointed towards the importance of octonions in the study of high energy physics. Clifford algebras and the standard model are being studied closely. The main advantage of this approach is that the spinor representations of the fundamental fermions can be constructed easily here as the left ideals of the algebra. Also the action of various Spin Groups on these representations too can be studied easily. In this work, we build on some recent advances in the field and try to determine the CKM angles from an algebraic framework. We obtain the mixing angle values as ${\theta }_{12}=11.093^o,{\theta }_{13}=0.172^o,{\theta }_{23}=4.054^o$. In comparison, the corresponding experimentally measured values for these angles are $13.04^o\pm 0.05^o,0.201^o\pm 0.011^o,2.38^o\pm 0.06^o$. The agreement of theory with experiment is likely to improve when running of quark masses is taken into account.

    hep-phUniverse(2023)·14 citations
19. 19*

    Dissociation cross sections of $\psi (3770)$, $\psi (4040)$, $\psi (4160)$, and $\psi (4415)$ mesons with nucleons

    Ruo-Qing Ding🇨🇳 · Xiao-Ming Xu🇨🇳 · H. J. Weber🇺🇸

    We study the dissociation of $\psi (3770)$, $\psi (4040)$, $\psi (4160)$, and $\psi (4415)$ mesons in collisions with nucleons, which takes place in high-energy proton-nucleus collisions. Quark interchange between a nucleon and a $c\bar{c}$ meson leads to the dissociation of the $c\bar{c}$ meson. We consider the reactions: $pR\to {\Lambda }_c^{+}{\bar{D}}^0$, $pR\to {\Lambda }_c^{+}{\bar{D}}^{\ast 0}$, $pR\to {\Sigma }_c^{++}{D}^{-}$, $pR\to {\Sigma }_c^{++}{D}^{\ast -}$, $pR\to {\Sigma }_c^{+}{\bar{D}}^0$, $pR\to {\Sigma }_c^{+}{\bar{D}}^{\ast 0}$, $pR\to {\Sigma }_c^{\ast ++}{D}^{-}$, $pR\to {\Sigma }_c^{\ast ++}{D}^{\ast -}$, $pR\to {\Sigma }_c^{\ast +}{\bar{D}}^0$, and $pR\to {\Sigma }_c^{\ast +}{\bar{D}}^{\ast 0}$, where $R$ stands for $\psi (3770)$, $\psi (4040)$, $\psi (4160)$, or $\psi (4415)$. A reaction of a neutron and a $c\bar{c}$ meson corresponds to a reaction of a proton and the $c\bar{c}$ meson by replacing the up quark with the down quark and vice versa. Transition-amplitude formulas are derived from the $S$-matrix element. Unpolarized cross sections are calculated with the transition amplitudes for scattering in the prior form and in the post form. The cross sections relate to nodes in the radial wave functions of $\psi (3770)$, $\psi (4040)$, $\psi (4160)$, and $\psi (4415)$ mesons.

    hep-phCommun.Theor.Phys.(2024)·1 citation
20. 20*

    $B_c$-meson decays into $J/\psi$ plus a light meson in the improved perturbative QCD formalism

    Xin Liu🇨🇳

    In the wake of measurements on $B_c^{+}\to J/\psi K^{+}$, $B_c^{+}\to J/\psi {\pi }^{+}{\pi }^{-}{\pi }^{+}$, and $B_c^{+}\to J/\psi K^{+}{K}^{-}{\pi }^{+}$ at Large Hadron Collider experiments, we propose to study the decays $B_c^{+}\to J/\psi M^{+}$ comprehensively, with $M$ being the light charged pseudoscalar ($P$), vector ($V$), scalar ($S$), axial-vector ($A$), and tensor ($T$) mesons, within the improved perturbative QCD (iPQCD) formalism at leading order in the Standard Model. The theoretical predictions for experimental observables such as branching fractions, relative ratios, and longitudinal polarization fractions in the iPQCD formalism await near future examinations relying on the upgraded Large Hadron Collider, even the forthcoming Circular Electron-Positron Collider. We emphasize that the investigations on the factorizable-emission-suppressed or -forbidden decays like $B_c^{+}\to J/\psi S^{+}$, $B_c^{+}\to J/\psi A_{1^1{P}_1}^{+}$, and $B_c^{+}\to J/\psi T^{+}$, should go definitely beyond naive factorization to explore the rich dynamics, which could, in turn, further help understand the QCD nature of $B_c$ meson, as well as that of related hadrons. The future confirmations on those predictions about the relative ratios between the branching fractions of $B_c^{+}\to J/\psi b_1(1235{)}^{+}(a_0(980{)}^{+},a_0(1450{)}^{+},a_2(1320{)}^{+})$ and $B_c^{+}\to J/\psi {\pi }^{+}$ could further examine the reliability of this iPQCD formalism. Because of containing only tree-level $\bar{b}\to \bar{c}$ transitions, the {\it CP} asymmetries in the $B_c^{+}\to J/\psi M^{+}$ decays exhibit naturally zero.

    hep-phhep-exPRD(2023)·20 citations
21. 21*

    Spontaneous magnetization of a vacuum in high temperature gluodynamics (two-loop approximation

    V. Skalozub🇺🇦

    In SU(N) gluodynamics, at high temperature the spontaneous magnetization, b(T) not equal to 0, of a vacuum happens in the approximation to the effective potential - the tree plus the one-loop, plus daisy diagrams, W(b)= b^2/2 g^2 + W^(1)(b) + W^(daisy)(b). At the same time, in two-loop approximation, W(A_0)= W^(1)(A_0) + W^(2)(A_0), other classical field - A_0 condensate directly related to the Polyakov loop - is also spontaneously generated. To investigate the creation of the condensates together, the two loop effective potential of both fields should be calculated. This program was realized recently for SU(2) in [1]. However, the generation of magnetic field in two-loop order was not studied in detail. In the present paper, we compute the value of chromomagnetic field b(T) for latter case. Then, considering the spectrum of color charged gluons at the background of both condensates, we conclude that the A_0 stabilizes the magnetized vacuum at high temperature. This is in agreement with the lattice simulations carried out already and clarifies the mechanism of the magnetic field stabilization. Key words: condetsation, high temperature, gluodynamics, A0 condensate, spontaneous magnetization, vacuum

    hep-phJ. of Physics and Elrctronics, v. 30 (2),…·4 citations
22. 22*

    Invisible dark matter decays of a non-Standard Model like CP-even scalar boson

    Maien Binjonaid (King Saud University)🇸🇦

    We investigate two extensions of the standard model that include particle dark matter candidates: the Next-to-Two Higgs Doublet Model and the Next-to-minimal Supersymmetric Standard Model. These models feature a non-Standard Model like CP-even scalar with a sub-TeV mass, denoted by $H_2$, among other particles. At a 13 TeV proton-proton collider, the primary production channel for such scalars is via the fusion of a pair of gluons. Subsequently, these scalars can decay invisibly into a pair of dark matter candidates, which can be dominant. In the supersymmetric model, it is possible for the Lightest Supersymmetric Particle (LSP) and Next-to Lightest Supersymmetric Particle (NLSP) to be mass degenerate, leading to quasi-invisible $H_2$ decays to LSP+NLSP and NLSP+NLSP. We present the predictions of both models for this challenging scenario while ensuring compatibility with recent experimental constraints.

    hep-phJournal of King Saud University - Science(2024)·4 citations
23. 23*

    Use of $SU(3)$ flavor projection operators to construct baryon-meson scattering amplitudes in the $1/N_c$ expansion

    Victor Miguel Banda Guzmán🇲🇽 · Ruben Flores-Mendieta🇲🇽 · Johann Hernandez🇲🇽

    An $SU(3)$ flavor projection operator technique is implemented to construct the baryon-meson scattering amplitude in the framework of the $1/N_c$ expansion of QCD, where $N_c$ is the number of color charges. The operator technique is implemented to evaluate not only the lowest-order scattering amplitude but also effects coming from first-order perturbative $SU(3)$ flavor symmetry breaking and strong isospin breaking. The most general expression is obtained by accounting for explicitly the effects of the decuplet-octet baryon mass difference. At order $\mathcal{O}(1/N_c^2)$, a large number of unknown operator coefficients appear, so there is little additional predictive power unless leading and subleading terms are retained. Although the resultant expression is general enough that it can be applied to any incoming and outgoing baryons and pseudo scalar mesons, provided that the Gell-Mann--Nishijima scheme is respected, results for $N\pi \to N\pi$ scattering processes are explicitly dealt with.

    hep-phCPC(2026)·5 citations
24. 24*

    The high-energy QCD dynamics from Higgs-plus-jet correlations at the FCC

    Francesco Giovanni Celiberto🇮🇹 · Alessandro Papa🇮🇹

    Recent analyses on high-energy inclusive Higgs-boson rates in proton collisions via the gluon-fusion channel, matched with the state of-the-art fixed-order N${}^3$LO accuracy, have shown that the impact of high-energy resummation corrections reaches 10% at the FCC nominal energies. This supports the statement that electroweak physics at 100 TeV is expected to receive relevant contributions from small-$x$ physics. In this preliminary study we present novel predictions for transverse-momentum and rapidity distributions sensitive to the inclusive emission of a Higgs boson in association with a light-flavored jet in proton collisions, calculated within the NLL accuracy of the energy-logarithmic resummation. We highlight how high-energy signals for this process are already present and visible at current LHC energies, and they are also sizable at the FCC ones. We come out with the message that the improvement of fixed-order calculations on Higgs-sensitive QCD distributions is a core ingredient to reach the precision level in the description of observables relevant for the Higgs physics at the FCC.

    hep-phhep-ex31 citations
25. 25*

    MLAnalysis: An open-source program for high energy physics analyses

    Yu-Chen Guo🇨🇳 · Fan Feng🇨🇳 · An Di🇨🇳 · Shi-Qi Lu🇨🇳 · Ji-Chong Yang🇨🇳

    We present a python-based program for phenomenological investigations in particle physics using machine learning algorithms, called \verb"MLAnalysis". The program is able to convert LHE and LHCO files generated by \verb"MadGraph5_aMC@NLO" into data sets for machine learning algorithms, which can analyze the information of the events. At present, it contains three machine learning (ML) algorithms: isolation forest (IF) algorithm, nested isolation forest (NIF) algorithm, kmeans anomaly detection (KMAD), and some basic functionality to analyze the kinematic features of a data set. Users can use this program to improve the efficiency of searching for new physics signals.

    hep-phComput.Phys.Commun.(2024)·16 citations
26. 26*

    Pileup and Infrared Radiation Annihilation (PIRANHA): A Paradigm for Continuous Jet Grooming

    Samuel Alipour-Fard🇺🇸 · Patrick T. Komiske🇺🇸 · Eric M. Metodiev🇺🇸 · Jesse Thaler🇺🇸

    Jet grooming is an important strategy for analyzing relativistic particle collisions in the presence of contaminating radiation. Most jet grooming techniques introduce hard cutoffs to remove soft radiation, leading to discontinuous behavior and associated experimental and theoretical challenges. In this paper, we introduce Pileup and Infrared Radiation Annihilation (PIRANHA), a paradigm for continuous jet grooming that overcomes the discontinuity and infrared sensitivity of hard-cutoff grooming procedures. We motivate PIRANHA from the perspective of optimal transport and the Energy Mover's Distance and review Apollonius Subtraction and Iterated Voronoi Subtraction as examples of PIRANHA-style grooming. We then introduce a new tree-based implementation of PIRANHA, Recursive Subtraction, with reduced computational costs. Finally, we demonstrate the performance of Recursive Subtraction in mitigating sensitivity to soft distortions from hadronization and detector effects, and additive contamination from pileup and the underlying event.

    hep-phhep-exJHEP(2023)·11 citations
27. 27*

    Phenomenology of the simplest linear seesaw mechanism

    Aditya Batra🇮🇳 · Praveen Bharadwaj🇮🇳 · Sanjoy Mandal🇰🇷 · Rahul Srivastava🇮🇳 · José W. F. Valle🇪🇸

    The linear seesaw mechanism provides a simple way to generate neutrino masses. In addition to Standard Model particles, it includes quasi-Dirac leptons as neutrino mass mediators, and a leptophilic scalar doublet seeding small neutrino masses. Here we review its associated physics, including restrictions from theory and phenomenology. The model yields potentially detectable $\mu \to e\gamma$ rates as well as distinctive signatures in the production and decay of heavy neutrinos ($N_i$) and the charged Higgs boson ($H^{\pm }$) arising from the second scalar doublet. We have found that production processes such as $e^{+}{e}^{-}\to NN$, $e^{-}\gamma \to N{H}^{-}$ and $e^{+}{e}^{-}\to H^{+}{H}^{-}$ followed by the decay chain $H^{\pm }\to {\ell }_i^{\pm }N$, $N\to {\ell }_j^{\pm }{W}^{\mp }$ leads to striking lepton number violation signatures at high energies which may probe the Majorana nature of neutrinos.

    hep-phhep-exJHEP(2023)·30 citations
28. 28*

    Detecting the critical point through entanglement in Schwinger model

    Kazuki Ikeda🇺🇸 · Dmitri E. Kharzeev🇺🇸 · René Meyer🇩🇪 · Shuzhe Shi🇺🇸

    Using quantum simulations on classical hardware, we study the phase diagram of the massive Schwinger model with a $\theta$-term at finite chemical potential $\mu$. We find that the quantum critical point in the phase diagram of the model can be detected through the entanglement entropy and entanglement spectrum. As a first step, we chart the phase diagram using conventional methods by computing the dependence of the charge and chiral condensates on the fermion mass $m$, coupling constant $g$, and the chemical potential $\mu$. At zero density, the Schwinger model possesses a quantum critical point at $\theta =\pi$ and $m/g\simeq 0.33$. We find that the position of this quantum critical point depends on the chemical potential. Near this quantum critical point, we observe a sharp maximum in the entanglement entropy. Moreover, we find that the quantum critical point can be located from the entanglement spectrum by detecting the position of the gap closing point.

    hep-phcond-mat.str-elhep-exhep-lat+2PRD(2023)·36 citations
29. 29*

    First Constraints on the Photon Coupling of Axion-like Particles from Multimessenger Studies of the Neutron Star Merger GW170817

    P. S. Bhupal Dev🇺🇸 · Jean-François Fortin🇨🇦 · Steven P. Harris🇺🇸 · Kuver Sinha🇺🇸 · Yongchao Zhang🇨🇳

    We use multimessenger observations of the neutron star merger event GW170817 to derive new constraints on axion-like particles (ALPs) coupling to photons. ALPs are produced via Primakoff and photon coalescence processes in the merger, escape the remnant and decay back into two photons, giving rise to a photon signal approximately along the line-of-sight to the merger. We analyze the spectral and temporal information of the ALP-induced photon signal, and use the Fermi-LAT observations of GW170817 to derive our new ALP constraints. We also show the improved prospects with future MeV gamma-ray missions, taking the spectral and temporal coverage of Fermi-LAT as an example.

    hep-phastro-ph.HEPRL(2024)·56 citations
30. 30*

    Higgs to $b\bar{b}$ from Vector Boson Fusion for High-Scale Physics

    Tao Han🇺🇸 · Sze Ching Iris Leung🇺🇸 · Matthew Low🇺🇸

    Vector boson fusion is arguably the most direct collider probe of electroweak symmetry breaking. Typically, the signature includes two forward/backward jets with low transverse momenta with a scale that is set by the mass of the vector boson. For this reason, an upper cut is used when searching for vector boson fusion processes in the Standard Model. Alternatively, the upper cut on the forward jets can be removed and the high-momentum exchange region of vector boson fusion can be studied. This phase space region has sensitivity to new physics via higher dimensional operators and form factors. In this work, we study the high-momentum region of the vector boson fusion channel where the Higgs decays to $b\bar{b}$. We show that, depending on the form of new physics, the limits on the new physics scale range from 0.5 TeV to 1.8 TeV.

    hep-phhep-exPRD(2024)·4 citations
31. 31*

    Hydrodynamic sound shell model

    Rong-Gen Cai🇨🇳 · Shao-Jiang Wang🇨🇳 · Zi-Yan Yuwen🇨🇳

    For a cosmological first-order phase transition in the early Universe, the associated stochastic gravitational wave background is usually dominated by sound waves from plasma fluid motions, which have been analytically modeled as a random superposition of freely propagating sound shells but with the force by the scalar field that produces the self-similar profile removed. In this Letter, we propose a new analytic sound shell model by focusing on the forced propagating contribution from the initial collision stage of sound shells when their self-similar profiles are still maintained by the moving bubble walls. We reproduce the causal $k^3$ scaling in the infrared consistent with numerical simulations, and also recover the broad dome in the power spectrum first observed in numerical simulations. The total sound waves should contain both contributions from forced collisions and free propagation of sound shells at early and late stages of the phase transition, respectively.

    ↳ gr-qcastro-ph.COhep-phPRD(2023)·46 citations
32. 32*

    The EB-correlation in Resolved Polarized Images: Connections to Astrophysics of Black Holes

    Razieh Emami🇺🇸 · Sheperd S. Doeleman🇺🇸 · Maciek Wielgus🇩🇪 · Dominic Chang · Koushik Chatterjee🇺🇸 · Randall Smith · Matthew Liska · James F. Steiner · Angelo Ricarte · Ramesh Narayan · Grant Tremblay · Douglas Finkbeiner and 9 other authors

    We present an in-depth analysis of a newly proposed correlation function in visibility space, between the E and B modes of the linear polarization, hereafter the EB-correlation, for a set of time-averaged GRMHD simulations compared with the phase map from different semi-analytic models as well as the Event Horizon Telescope (EHT) 2017 data for M87* source. We demonstrate that the phase map of the time-averaged EB-correlation contains novel information that might be linked to the BH spin, accretion state and the electron temperature. A detailed comparison with a semi-analytic approach with different azimuthal expansion modes shows that to recover the morphology of the real/imaginary part of the correlation function and its phase, we require higher orders of these azimuthal modes. To extract the phase features, we propose to use the Zernike polynomial reconstruction developing an empirical metric to break degeneracies between models with different BH spins that are qualitatively similar. We use a set of different geometrical ring models with various magnetic and velocity field morphologies and show that both the image space and visibility based EB-correlation morphologies in MAD simulations can be explained with simple fluid and magnetic field geometries as used in ring models. SANEs by contrast are harder to model, demonstrating that the simple fluid and magnetic field geometries of ring models are not sufficient to describe them owing to higher Faraday Rotation depths. A qualitative comparison with the EHT data demonstrates that some of the features in the phase of EB-correlation might be well explained by the current models for BH spins as well as electron temperatures, while others may require a larger theoretical surveys.

    ↳ astro-ph.GAastro-ph.COastro-ph.HEhep-ph+1ApJ(2023)·6 citations
33. 33*

    Methods and prospects for gravitational wave searches targeting ultralight vector boson clouds around known black holes

    Dana Jones🇦🇺 · Ling Sun🇦🇺 · Nils Siemonsen🇨🇦 · William E. East🇨🇦 · Susan M. Scott🇦🇺 · Karl Wette🇦🇺

    Ultralight bosons are predicted in many extensions to the Standard Model and are popular dark matter candidates. The black hole superradiance mechanism allows for these particles to be probed using only their gravitational interaction. In this scenario, an ultralight boson cloud may form spontaneously around a spinning black hole and extract a non-negligible fraction of the black hole's mass. These oscillating clouds produce quasi-monochromatic, long-duration gravitational waves that may be detectable by ground-based or space-based gravitational wave detectors. We discuss the capability of a new long-duration signal tracking method, based on a hidden Markov model, to detect gravitational wave signals generated by ultralight vector boson clouds, including cases where the signal frequency evolution timescale is much shorter than that of a typical continuous wave signal. We quantify the detection horizon distances for vector boson clouds with current- and next-generation ground-based detectors. We demonstrate that vector clouds hosted by black holes with mass $\gtrsim 60M_{\odot }$ and spin $\gtrsim 0.6$ are within the reach of current-generation detectors up to a luminosity distance of $\sim 1$ Gpc. This search method enables one to target vector boson clouds around remnant black holes from compact binary mergers detected by gravitational-wave detectors. We discuss the impact of the sky localization of the merger events and demonstrate that a typical remnant black hole reasonably well-localized by the current generation detector network is accessible in a follow-up search.

    ↳ gr-qcastro-ph.HEhep-phPRD(2023)·31 citations
34. 34*

    Dissipative Callan-Harvey mechanism in 2+1 D Dirac system: The fate of edge states along a domain wall

    C. X. Zhang🇩🇪 · M. Ulybyshev🇩🇪 · C. Northe🇩🇪 · E. M. Hankiewicz🇩🇪

    The Callan-Harvey mechanism in 2+1 D Jackiw-Rebbi model is revisited. We analyzed Callan-Harvey anomaly inflow in the massive Chern insulator (quantum anomalous Hall system) subject to external electric field. In addition to the conventional current flowing from the bulk to edge due to parity anomaly, we considered the dissipation of the edge charge due to interaction with external bosonic bath in 2+1 D and due to external bath of photons in 3+1 D. In the case of 2+1 D bosonic bath, we found the new stationary state, which is defined by the balance between Callan-Harvey current and the outgoing flow caused by the dissipation processes. In the case of 3+1 D photon bath, we found a critical electric field, below which this balance state can be achieved, but above which there is no such a balance. Furthermore, we estimated the photon-mediated transition rate between 2+1 D bulk and 1+1 D topological edge state of the order of one ns${}^{-1}$ (nanosecond) at the room temperature.

    ↳ cond-mat.mes-hallhep-phPRB(2023)·0 citations
35. 35*

    Detecting the secondary spin with extreme mass ratio inspirals in Scalar-Tensor theory

    Hong Guo🇨🇳 · Chao Zhang🇨🇳 · Yunqi Liu🇨🇳 · Rui-Hong Yue🇨🇳 · Yungui Gong🇨🇳 · Bin Wang🇨🇳

    In this paper, we investigate the detectability of secondary spin in the extreme mass ratio inspirals system within a modified gravity model coupled with a scalar field. The central black hole, which reduces to a Kerr one, is circularly spiralled by a scalar-charged spinning secondary body on the equatorial plane. The analysis reveals that the presence of the scalar field amplifies the secondary spin effect, allowing for a lower limit of the detectability and an improved resolution of the secondary spin when the scalar charge is sufficiently large. Our findings suggest that the secondary spin detection is more feasible when the primary mass is not large, and TianQin is the optimal choice for detection.

    ↳ gr-qchep-phCPC(2024)·9 citations
36. 36*

    Observational constraints on power law Starobinsky inflation

    Saisandri Saini🇮🇳 · Akhilesh Nautiyal🇮🇳

    In this work we revisit power law, $\frac{1}{M^2}{R}^{\beta }$, inflation to find the deviations from $R^2$ inflation allowed by current CMB and LSS observations. We compute the power spectra for scalar and tensor perturbations numerically and perform MCMC analysis to put constraints on parameters $M$ and $\beta$ from Planck-2018, BICEP3 and other LSS observations. We consider general reheating scenario and also vary the number of e-foldings during inflation, $N_{pivot}$, along with the other parameters. We find $\beta =1.966_{-0.042}^{+0.035}$, $M=\left(3.31_{-2}^{+5}\right)\times 10^{-5}$ and $N_{pivot}=41_{-10}^{+10}$ with $95\%C.L.$. This indicates that the current observations allow deviation from Starobinsky inflation. The scalar spectral index, $n_s$, and tensor-to-scalar ratio, $r$, derived from these parameters, are consistent with the Planck and BICEP3 observations.

    ↳ astro-ph.COgr-qchep-phhep-thPRD(2023)·5 citations
37. 37*

    Impact of isovector pairing fluctuation on neutrinoless double-beta decay in multi-reference covariant density functional theory

    C. R. Ding🇨🇳 · X. Zhang🇨🇳 · J. M. Yao🇨🇳 · P. Ring🇩🇪 · J. Meng🇨🇳

    We extend the multi-reference covariant density functional theory (MR-CDFT) by including fluctuations in quadrupole deformations and average isovector pairing gaps simultaneously for the nuclear matrix elements (NMEs) of neutrinoless double-beta $(0\nu \beta \beta )$ decay in the candidate nuclei ${}^{76}$Ge, ${}^{82}$Se, ${}^{100}$Mo, ${}^{130}$Te, and ${}^{136}$Xe assuming the exchange of either light or heavy neutrinos. The results indicate a linear correlation between the predicted NMEs and the isovector pairing strengths, as well as the excitation energies of $2_1^{+}$ and $4_1^{+}$ states. By adjusting the pairing strengths based on the excitation energies of the $2_1^{+}$ states, we calculate the NMEs for $0\nu \beta \beta$ decay, which are reduced by approximately $12\%$ to $62\%$ compared to the results obtained in the previous studies by Song et al. [Phys. Rev. C95, 024305 (2017)]. Additionally, upon introducing the average isovector pairing gap as an additional generator coordinate in the calculation, the NMEs increase by a factor ranging from $56\%$ to $218\%$.

    ↳ nucl-thhep-phnucl-exPRC(2023)·11 citations
38. 38*

    Recent Results from BABAR: Dark Matter, Axion-like Particles and Heavy Neutral Leptons, a contribution to the 2023 Electroweak session of the 57th Rencontres de Moriond

    Sophie Middleton🇺🇸

    Three independent searches for new physics using data collected at BABAR are presented. Firstly, two searches for dark matter and baryogenesis: $B^0\to \Lambda +{\psi }_D$ and $B^{+}\to p+{\psi }_D$ are detailed, where ${\psi }_D$ is a new dark fermion. Neither signal is observed and new upper limits on the branching fractions, at the 90 $\%$ confidence level (C.L), are placed at $\mathcal{O}(10^{-5}-10^{-6})$ across the mass range $1.0<m_{{\psi }_D}<4.3$ GeV/c${}^2$. Secondly, new limits on the coupling, $g_{aW}$, of an axion-like particle ($a$) to the $W$ boson, at the 90 $\%$ C.L, are presented at $\mathcal{O}(10^{-5})$ GeV${}^{-1}$ for $a$ masses in the mass range 0.175 $<m_a<$ 4.78 GeV/c${}^2$. Thirdly, a model-independent search for heavy neutral leptons (HNL) found new upper limits at the 95 $\%$ C.L on the extended Pontecorvo-Maki-Nakagawa-Sakata (PMNS) matrix element, $|U_{\tau 4}{|}^2$, which depend on the HNL mass hypothesis and vary from $2.31\times 10^{-2}$ to $5.04\times 10^{-6}$, across the mass range $100<m_4<1300$ MeV/c${}^2$, with more stringent limits on higher HNL masses.

    ↳ hep-exhep-ph0 citations
39. 39*

    Flowing fields and optimal RG-flows

    Friederike Ihssen🇩🇪 · Jan M. Pawlowski🇩🇪

    Renormalisation group approaches are tailor made for resolving the scale-dependence of quantum and statistical systems, and hence their phase structure and critical physics. Usually this advantage comes at the price of having to truncate the full theory at hand, which asks for optimal expansion schemes. In the present work we use a functional renormalisation group (fRG) approach for the effective action which includes general scale-dependent reparametrisations of the theory [1]. This approach is used in an O(N)-theory to set up adaptive RG-flows that correspond to an optimal systematic expansion of the theory about the ground state or rather its full covariance or propagator. These parametrisations are induced by flowing fields that encode the differential reparametrisation steps. The approach is put to work for an investigation of the thermal phase transition in the O(4)-theory in view of applications to QCD. The respective results are compared with those obtained in standard fRG computations.

    ↳ hep-thhep-ph25 citations
40. 40*

    Novel high-frequency gravitational waves detection with split cavity

    Chu-Tian Gao🇨🇳 · Yu Gao🇨🇳 · Yiming Liu🇨🇳 · Sichun Sun🇨🇳

    Gravitational waves can generate electromagnetic effects inside a strong electric or magnetic field within the Standard Model and general relativity. Here we propose using a quarterly split cavity and LC(inductor and capacitor)-resonance circuit to detect a high-frequency gravitational wave from 0.1 MHz to GHz. We perform a full 3D simulation of the cavity's signal for sensitivity estimate. Our sensitivity depends on the coherence time scale of the high-frequency gravitational wave sources and the volume size of the split cavity. We discuss the resonant measurement schemes for narrow-band gravitational wave sources and also a non-resonance scheme for broadband signals. For a meter-sized split cavity under a 14 Tesla magnetic field, the LC resonance enhanced sensitivity to the gravitational wave strain is expected to reach $h\sim 10^{-20}$ around $10$ MHz.

    ↳ gr-qcastro-ph.COhep-phPRD(2024)·11 citations
41. 41*

    Primordial power spectrum in light of JWST observations of high redshift galaxies

    Priyank Parashari🇮🇳 · Ranjan Laha🇮🇳

    Early data releases of JWST have revealed several high redshift massive galaxy candidates by photometry, and some of them have been confirmed spectroscopically. We study their implications on the primordial power spectrum. In the first part, we use the CEERS photometric survey data, along with respective spectroscopic updates, to compute the cumulative comoving stellar mass density. We find that a very high star formation efficiency (unlikely in various theoretical scenarios) is required to explain these observations within Lambda cold dark matter ($\Lambda$CDM) cosmology. We show that the tension can be eased if the primordial power spectrum has a blue tilt. In the second part, we study spectroscopically confirmed galaxies reported in the JADES survey to investigate their implications on a red-tilted primordial power spectrum. We estimate the star formation efficiency from an earlier observation at similar redshift by {\it Spitzer}, and find that the star formation efficiency is an order of magnitude smaller than required to explain the CEERS photometric observations mentioned earlier. Using the estimated star formation efficiency, we find the strongest constraints on the red tilt of the power spectrum over some scales. Our study shows that JWST will be an excellent probe of the power spectrum and can lead to novel discoveries.

    ↳ astro-ph.COastro-ph.GAgr-qchep-phMNRAS(2023)·76 citations
42. 42*

    Self-similar growth of Bose stars

    A.S. Dmitriev🇷🇺 · D.G. Levkov🇷🇺 · A.G. Panin🇷🇺 · I.I. Tkachev🇷🇺

    We analytically solve the problem of Bose star growth in the bath of gravitationally interacting particles. We find that after nucleation of this object the bath is described by a self-similar solution of kinetic equation. Together with the conservation laws, this fixes mass evolution of the Bose star. Our theory explains, in particular, the slowdown of the star growth at a certain "core-halo" mass, but also predicts formation of heavier and lighter objects in magistral dark matter models. The developed "adiabatic" approach to self-similarity may be of interest for kinetic theory in general.

    ↳ astro-ph.COastro-ph.GAcond-mat.stat-mechhep-phPRL(2024)·47 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.