Thu·Oct 5, 2023Thursday·October 5, 2023

1. 01*

   Predictions from scoto-seesaw with $A_4$ modular symmetry

   Ranjeet Kumar🇮🇳 · Priya Mishra🇮🇳 · Mitesh Kumar Behera🇹🇭 · Rukmani Mohanta🇮🇳 · Rahul Srivastava🇮🇳

   This paper's novelty lies in introducing a hybrid scoto-seesaw model rooted in $A_4$ discrete modular symmetry leading to several interesting phenomenological implications. The scoto-seesaw framework leads to generation of one mass square difference $(\Delta m_{\mathrm{atm}}^2$) using the type-I seesaw mechanism at the tree level. Additionally, the scotogenic contribution is vital in obtaining the other mass square difference ($\Delta m_{\mathrm{sol}}^2$) at the loop level, thus providing a clear interpretation of the two different mass square differences. The non-trivial transformation of Yukawa couplings under the $A_4$ modular symmetry helps to explore neutrino phenomenology with a specific flavor structure of the mass matrix. In addition to predictions for neutrino mass ordering, mixing angles and CP phases, this setup leads to precise predictions for $\sum m_i$ as well as $|m_{ee}|$. In particular, the model predicts $\sum m_i\in (0.073,0.097)$ eV and $\left|m_{ee}\right|\in (3.15,6.66)\times 10^{-3}$ eV range; within reach of upcoming experiments. Furthermore, our model is also promising for addressing lepton flavor violations, i.e., ${\ell }_{\alpha }\to {\ell }_{\beta }\gamma$, ${\ell }_{\alpha }\to 3{\ell }_{\beta }$ and $\mu -e$ conversion rates while staying within the realm of current experimental limits.

   hep-phhep-exPLB(2024)·50 citations
2. 02*

   Impact of vector mesons polarization on its interaction with matter

   S. R. Gevorkyan🇷🇺 · A. V. Guskov🇷🇺

   The production of unstable particles on different nuclei provides the possibility to determine the total cross section of the interaction of vector mesons $V=\rho ,\omega ,\phi ,K^{\ast 0}(892),J/\psi$ etc. with nucleons. This interaction is defined by a set of amplitudes that correspond to the transverse (helicity $\lambda =\pm 1$) or longitudinal ($\lambda =0$) polarization of the vector meson. The total cross section for the interaction of transversely polarized vector mesons with nucleon ${\sigma }_T=\sigma (V_{T}N)$ has been extracted from the coherent photoproduction of vector mesons off nuclei, while the vector meson production in charge exchange reactions as ${\pi }^{\pm }(K^{\pm })+A\to V^0(K^{\ast 0})+A^{\prime }$ provides the unique opportunity to obtain the not yet measured total cross section for longitudinally polarized vector meson interacting with nucleon ${\sigma }_L=\sigma (V_{L}N)$. We shortly discuss the importance of the knowledge of ${\sigma }_L$ and possibility to extract its value from experiments on nuclear target.

   hep-phEPJC(2024)·1 citation
3. 03*

   QGP probes from a dynamical holographic model of AdS/QCD

   Sara Heshmatian🇮🇷 · Razieh Morad🇿🇦

   In this paper, we employ the gauge/gravity duality to study some features of the quark gluon plasma. For this purpose, we implement a holographic QCD model constructed from an Einstein-Maxwell-Dilaton gravity at finite temperature and finite chemical potential. The model captures both the confinement and deconfinement phases of QCD and we use it to study the effect of temperature and chemical potential on a heavy quark moving through the plasma. We calculate the drag force, Langevin diffusion coefficients and also the jet quenching parameter, and our results align with other holographic QCD models and the experimental data.

   hep-phhep-thEPJC(2024)·4 citations
4. 04*

   B meson rare decays in the TNMSSM

   Hai-Xiang Chen🇨🇳 · Sheng-Kai Cui🇨🇳 · Ning-Yu Zhu🇨🇳 · Zhao-Yang Zhang🇨🇳 · Huai-Cong Hu🇨🇳

   We investigate the two loop electroweak corrections to B meson rare decays $\bar{B}\to X_s\gamma$ and $B_s^0\to {\mu }^{+}{\mu }^{-}$ in the minimal supersymmetry standard model (MSSM) extension with two triplets and one singlet (TNMSSM). The new particle contents and interactions in the TNMSSM can affect the theoretical predictions of the branching ratios $\mathrm{Br}(\bar{B}\to X_s\gamma )$ and $\mathrm{Br}(B_s^0\to {\mu }^{+}{\mu }^{-})$, and the corrections from two loop diagrams to the process $\bar{B}\to X_s\gamma$ can reach around $4\%$. Considering the latest experimental measurements, the numerical results of $\mathrm{Br}(\bar{B}\to X_s\gamma )$ and $\mathrm{Br}(B_s^0\to {\mu }^{+}{\mu }^{-})$ in the TNMSSM are presented and analyzed. It is found that the results in the TNMSSM can fit the updated experimental data well and the new parameters $T_{\lambda },\kappa ,\lambda$ affect the theoretical predictions of $\mathrm{Br}(\bar{B}\to X_s\gamma )$ and $\mathrm{Br}(B_s^0\to {\mu }^{+}{\mu }^{-})$ obviously.

   hep-phCPC(2024)·5 citations
5. 05*

   Self-consistent description of HERA data at low $Q^2$ and soft hadron production at LHC

   A. V. Lipatov🇷🇺 · G. I. Lykasov🇷🇺 · M. A. Malyshev🇷🇺

   Using the analytical expression for transverse momentum dependent (TMD) gluon density in a proton, a self-consistent simultaneous description of low $Q^2$ data on proton structure function $F_2(x,Q^2)$, reduced cross section for the electron-proton deep inelastic scattering at HERA and soft hadron production in $pp$ collisions at the LHC is achieved in the framework of color dipole approach and modified quark-gluon string model.

   hep-phPLB(2024)·10 citations
6. 06*

   Anisotropy of magnetized quark matter

   Kangkan Goswami🇮🇳 · Dushmanta Sahu🇮🇳 · Jayanta Dey🇮🇳 · Raghunath Sahoo🇮🇳 · Reinhard Stock🇮🇳

   Strong transient magnetic fields are generated in non-central relativistic heavy-ion collisions. These fields induce anisotropy within the strongly interacting medium that, in principle, can affect the thermodynamic properties of the medium. We use the Polyakov loop extended Nambu Jona-Lasinio model to study the quark matter subjected to an external magnetic field at vanishing baryon chemical potential (${\mu }_B$). We have estimated the degree of anisotropy in the speed of sound and isothermal compressibility within the magnetized quark matter as a function of temperature ($T$) and magnetic field ($eB$). This study helps us to understand the extent of directionality generated in the initial stages of non-central collisions while giving us useful information about the system.

   hep-phhep-exnucl-exnucl-thPRD(2024)·18 citations
7. 07*

   Searching for $H\to hh\to b\bar{b}\tau \tau$ in the 2HDM Type-I at the LHC

   A. Arhrib🇲🇦 · S. Moretti🇬🇧 · S. Semlali🇬🇧 · C. H. Shepherd-Themistocleous🇬🇧 · Y. Wang🇨🇳 · Q. S. Yan🇨🇳

   Unlike other realisations of the 2-Higgs Doublet Model (2HDM), the so-called Type-I allows for a very light Higgs boson spectrum. Specifically, herein, the heaviest of the two CP-even neutral Higgs states, $H$, can be the one discovered at the Large Hadron Collider (LHC) in 2012, with a mass of $\approx 125$ GeV and couplings consistent with those predicted by the Standard Model (SM). In such a condition of the model, referred to as `inverted mass hierarchy', the decay of the SM-like Higgs state into pairs of the lightest CP-even neutral Higgs boson, $h$, is possible, for masses of the latter ranging from $M_H/2\approx 65$ GeV down to 15 GeV or so, all compatible with experimental constraints. In this paper, we investigate the scope of the LHC in accessing the process $gg\to H\to hh\to b\bar{b}\tau \tau$ by performing a Monte Carlo (MC) analysis aimed at extracting this signal from the SM backgrounds, in presence of a dedicated trigger choice and kinematic selection. We prove that some sensitivity to such a channel exists already at Run 3 of the LHC while the High-Luminosity LHC (HL-LHC) will be able to either confirm or disprove this theoretical scenario over sizable regions of its parameter space.

   hep-phPRD(2024)·8 citations
8. 08*

   Possible explanation of not observing ultra-high energy cosmic neutrinos

   Jakub Rembielinski🇵🇱 · Jacek Ciborowski🇵🇱

   Assuming that neutrinos are spacelike (tachyonic) fermions, we calculate width for the kinematically allowed, lepton number conserving, three-body decay ${\nu }_{\alpha }\to {\nu }_{\alpha }{\nu }_{\beta }{\bar{\nu }}_{\beta }$ in the Standard Model. Decays of tachyonic neutrinos over cosmological distances can lead to a reduction of the neutrino flux in the high-energy end of the spectrum. We estimate upper limits on the spacelike neutrino mass based on the PeV-energy cosmological neutrino events observed in the IceCube experiment. These limits are close to those deduced from the measurements of $m_{\nu }^2$ in the tritium-decay experiment KATRIN.

   hep-phastro-ph.HEJHEAp(2024)·0 citations
9. 09*

   Peccei-Quinn mechanism and axion interactions in the 3-3-1 model with Cosmological Inflation

   H. N. Long (Van Lang U.)🇻🇳 · L. T. Hue (Van Lang U.)🇻🇳

   Based on the Peccei-Quinn (PQ) assignment, the PQ charge operator in the 3-3-1 model with Cosmological Inflation is constructed in terms of diagonal generators $T_3$ and $T_8$ of the $SU(3{)}_L$ subgroup. The formula shows that difference of PQ charges of up and down quarks is 2, i.e., $\text{De}{Q}_A=2$, while for electric charge, are assumed to be equal, while the ($Q_A$) are opposite. PQ charge of neutral scalars equal $\pm 2$, while for charged scalars, it vanishes. The couplings of axion with fermions are presented. To have correct kinetic term for the axion, the PQ scale $f_a$ is to be VEV of the singlet scalar boson, namely, $f_a=v_{\varphi }$. The photon couples to charged particles only, while in this model, the axion does not couple to charged scalar/gauge bosons. The point is worth emphasizing that the axion has doubly derivative coupling with scalar playing the role of inflaton. The new effects mainly happen in the energy region from $10^7\text{gev}$ to $10^{11}GeV$. The chiral effective Lagrangian as usually provides axion mass consistent with model-independent prediction.

   hep-ph1 citation
10. 10*

    On the possible experimental revelations of Unruh and Sokolov-Ternov effects

    Emil T. Akhmedov🇷🇺 · Kirill Gubarev🇷🇺

    In this paper we propose generalizations of the Sokolov-Ternov and Unruh effects, and discuss the possibility to measure them on different experiments.

    hep-phgr-qchep-thInt.J.Mod.Phys.A(2024)·4 citations
11. 11*

    A lepton model with nearly Cobimaximal mixing

    Juan Carlos Gómez-Izquierdo🇲🇽 · Asahel Enrique Pozas Ramírez🇲🇽

    Cobimaximal mixing predicts $\pi /4$ and $3\pi /2$ for the atmospheric angle and the Dirac CP-violating phase, respectively. These values are in tension with the neutrino globals fits. If this pattern was behind the lepton mixings, then it would have to be broken. In that case, in this paper, we explore the ${\mathbf{S}}_3$ flavor symmetry within the $B-L$ gauge model where the aforementioned scheme comes from the neutrino sector but the charged lepton contribution breaks the well known predictions so the mixing observables as well as the $m_{ee}$ mass can be accommodated quite well according to the available data. Notably, the predicted regions for the Dirac CP-violating phase would allow us to test the model in future experiments.

    hep-phRev.Mex.Fis.(2024)·5 citations
12. 12*

    Low-Energy Radiative Backgrounds in CCD-Based Dark-Matter Detectors

    Peizhi Du🇺🇸 · Daniel Egaña-Ugrinovic🇨🇦 · Rouven Essig🇺🇸 · Mukul Sholapurkar🇺🇸

    The reach of sub-GeV dark-matter detectors is at present severely affected by low-energy events from various origins. We present the theoretical methods to compute the single- and few-electron events that arise from secondary radiation emitted by high-energy particles passing through detector materials and perform simulations to quantify them at (Skipper) CCD-based experiments, focusing on the SENSEI data collected in the MINOS cavern at Fermilab. The simulations account for the generation of secondaries from Cherenkov and luminescent recombination; photo-absorption, reflection, refraction and thin-film interference in detector materials; roughness of the interfaces and the dynamics of charges and partial charge collection (PCC) in the doped CCD-backside. We consider several systematic uncertainties, notably those stemming from the backside charge-diffusion modeling, which we estimate with a "fiducial'' and an "extreme'' model, with the former model presenting better agreement with PCC data. We find that Cherenkov photons constitute about 40% of the observed single-electron events for both models; radiative recombination rates are negligible for the fiducial model, but can dominate over the Cherenkov rates for the extreme model. We also estimate the fraction of 2-electron events from 1-electron event same-pixel coincidences, finding that the entire 2-electron rate can be explained by coincidences of radiative events and spurious charge. Accounting for backgrounds, we project the sensitivity of future Skipper-CCD-based experiments to different dark-matter models. For light-mediator models with dark-matter masses of 1, 5, and 10 MeV, we find that future experiments with 10-kg-year exposures and successful background mitigation could have a sensitivity that is larger by 9, 3, and 2 orders of magnitude, respectively, when compared to an experiment without background improvements. (abridged)

    hep-phastro-ph.IMhep-exphysics.ins-detJHEP(2024)·13 citations
13. 13*

    Bi-gravity Portal Dark Matter

    Qing Chen🇨🇳 · Shuang-Yong Zhou🇨🇳

    We consider a model where the interaction between dark matter and the Standard Model particles are mediated by a ghost-free bi-gravity portal. The bi-gravity model invokes a massive spin-2 particle coupled to the usual massless graviton as well as generic bi-metric matter couplings. The cross-sections for dark matter direct detection are computed and confronted with the experimental bounds. The presence of the massive spin-2 mediator resolves the core-cusp problem, which in turn significantly constrains the dark matter coupling in such a bi-gravity theory. Yet, there remains a window of the parameter space where the model can be tested in the upcoming direct detection experiments such as XENONnT and PandaX-30T. The model also predicts a reheating temperature of the order of $10^6$ GeV.

    hep-phastro-ph.COgr-qchep-thPRD(2024)·4 citations
14. 14*

    First-order phase-transition on dynamical Lorentz symmetry breaking system

    Y. M. P. Gomes🇧🇷 · M. J. Neves🇧🇷

    A model of $N$ 4-component massless fermions in a quartic self-interaction based on ref. \cite{gomes2022} is investigated in the presence of chemical potential and temperature via optimized perturbation theory that accesses finite-N contributions. We use the generating functional approach to calculate the corrections to the effective potential of the model. The model introduces an auxiliary pseudo-vector field with a nontrivial minimum and is influenced by temperature $(T)$ and chemical potential $(\mu )$. These thermodynamic quantities are introduced through Matsubara formalism. Thereby, the integrals are modified, and via the principle of minimum sensitivity, we obtain the gap equations of the model. The correspondent finite-N solutions of these equations define the vacuum states of the model associated with the background pseudo-vector field. In particular, one focuses on its temporal component that acts as an effective chiral chemical potential. We discuss the solutions of the four cases in which $(T=0,\mu =0)$, $(T\ne 0,\mu \ne 0)$, $(T\ne 0,\mu =0)$ and $(T=0,\mu \ne 0)$, where the effective potential is so obtained as a function of the background vector field, the chemical potential, and the temperature. The model shows the finite-N corrections generate first-order phase transitions on the self-interacting fermions for the case $N=1$ and the persistence of a second-order phase transition for $N\ge 2$.

    ↳ hep-thhep-phNPB(2024)·0 citations
15. 15*

    Positivity from Cosmological Correlators

    Daniel Green🇺🇸 · Yiwen Huang🇺🇸 · Chia-Hsien Shen🇺🇸 · Daniel Baumann🇳🇱

    Effective field theories in flat space and in anti-de Sitter space are constrained by causality and unitarity, often in the form of positivity bounds. Similar bounds have been harder to demonstrate in cosmological backgrounds, where the roles of unitarity and causality are more obscure. Fortunately, the expansion of the universe ensures that late-time cosmological correlators are effectively classical and the role of unitarity is played by classical statistical inequalities. For multi-field inflation, the resulting positivity constraints have long been known in terms of the Suyama-Yamaguchi inequality. In this paper, we demonstrate that similar statistical bounds imply nontrivial constraints for massive fields in the early universe. We show that any real anomalous dimensions for principal series fields in de Sitter space must be positive. We also derive a limit on the amplitude of oscillatory signals from inflation, including those arising in cosmological collider physics. Finally, we demonstrate that these constraints manifest themselves directly in the two-point statistics of matter and galaxies that will be measured in upcoming surveys.

    ↳ hep-thastro-ph.COastro-ph.GAhep-phJHEP(2024)·37 citations
16. 16*

    Can negative bare couplings make sense? The ${\vec{\varphi }}^4$ theory at large $N$

    Ryan D. Weller🇺🇸

    Scalar $\lambda {\varphi }^4$ theory in 3+1D, for a positive coupling constant $\lambda >0$, is known to have no interacting continuum limit, which is referred to as quantum triviality. However, it has been recently argued that the theory in 3+1D with an $N$-component scalar $\vec{\varphi }$ and a $(\vec{\varphi }\cdot \vec{\varphi }{)}^2={\vec{\varphi }}^4$ interaction term does have an interacting continuum limit at large $N$. It has been suggested that this continuum limit has a negative (bare) coupling constant and exhibits asymptotic freedom, similar to the $\mathcal{P}\mathcal{T}$-symmetric $-g{\varphi }^4$ field theory. In this paper I study the ${\vec{\varphi }}^4$ theory in 3+1D at large $N$ with a negative coupling constant $-g<0$, and with the scalar field taking values in a $\mathcal{P}\mathcal{T}$-symmetric complex domain. The theory is non-trivial, has asymptotic freedom, and has a Landau pole in the IR, and I demonstrate that the thermal partition function matches that of the positive-coupling $\lambda >0$ theory when the Landau poles of the two theories (in the $\lambda >0$ case a pole in the UV) are identified with one another. The spirit of renormalization is that observables do not depend on the renormalization scale. Here we see even if the coupling is taken negative above the scale of the Landau pole, thermodynamic observables are unaffected. Thus the ${\vec{\varphi }}^4$ theory at large $N$ appears to have a negative bare coupling constant; the coupling only becomes positive in the IR, which in the context of other $\mathcal{P}\mathcal{T}$-symmetric and large-$N$ quantum field theories I argue is perfectly acceptable.

    ↳ hep-thhep-phnucl-th13 citations
17. 17*

    The unresolved stochastic background from compact binary mergers detectable by next-generation ground-based gravitational-wave observatories

    Darsan S. Bellie🇺🇸 · Sharan Banagiri🇺🇸 · Zoheyr Doctor🇺🇸 · Vicky Kalogera🇺🇸

    The next generation of ground-based gravitational-wave detectors will look much deeper into the Universe and have unprecedented sensitivities and low-frequency capabilities. Especially alluring is the possibility of detecting an early-Universe cosmological stochastic background that could provide important insights into the beginnings of our Universe and fundamental physics at extremely high energies. However, even if next-generation detectors are sensitive to cosmological stochastic backgrounds, they will be masked by more dominant astrophysical backgrounds, namely the residual background from the imperfect subtraction of resolvable compact binary coalescences (CBCs) as well as the CBC background from individually unresolvable CBCs. Using our latest knowledge of masses, rates, and delay time distributions, we present a data-driven estimate of the unresolvable CBC background that will be seen by next-generation detectors. Accounting for statistical and systematic errors, this estimate quantifies an important piece in the CBC noise budget for next-generation detectors and can help inform detector design and subtraction algorithms. We compare our results with predictions for backgrounds from several cosmological sources in the literature, finding that the unresolvable background will likely be a significant impediment for many models. This motivates the need for simultaneous inference methods or other statistical techniques to detect early-Universe cosmological backgrounds.

    ↳ gr-qcastro-ph.HEhep-phPRD(2024)·23 citations
18. 18*

    B-physics from Lattice Gauge Theory

    J. Tobias Tsang🇨🇭 · Michele Della Morte🇩🇰

    We discuss the main issues in dealing with heavy quarks on the lattice and shortly present the different approaches used. We discuss a selection of computations covering first the b-quark mass and the B(s) meson decay constants as the consolidated results (neglecting isospin breaking corrections). In the second part we consider recent calculations of form factors for tree-level semileptonic decays with emphasis on the tensions between the results produced by different collaborations. We propose benchmark quantities and tests suited to investigate the origin of such tensions. Finally, we review computations of the bag parameters parameterising neutral meson mixing and provide an overview on a few recent developments in the field.

    ↳ hep-lathep-phEur.Phys.J.ST(2024)·15 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.