Tue·May 17, 2022Tuesday·May 17, 2022

1. 01*

   Aspects of Axions and ALPs Phenomenology

   Maurizio Giannotti🇺🇸

   The physics of axions and axion-like particles (ALPs) is enjoying an incredibly productive period, with many new experimental proposals, theoretical idea, and original astrophysical and cosmological arguments which help the search effort. The large number of experimental proposals is likely to lead to fundamental advances (perhaps, a discovery?) in the coming years. The aim of this article is to provide a very brief overview of some of the recent developments in axions and ALP phenomenology, and to discuss some relevant aspects in this important field. A particular attention is given to the definition of motivated regions in the axion parameters space, which should be the targets of experimental searches.

   hep-phastro-ph.COastro-ph.HEastro-ph.SRJ.Phys.Conf.Ser.(2023)·16 citations
2. 02*

   Strong decay widths and mass spectra of charmed baryons

   H. Garcia-Tecocoatzi🇮🇹 · A. Giachino🇦🇷 · J. Li🇨🇳 · A. Ramirez-Morales🇰🇷 · E. Santopinto🇮🇹

   The total decay widths of the charmed baryons are calculated by means of the ${}^3{P}_0$ model. Our calculations consider in the final states: the charmed baryon-(vector/pseudoscalar) meson pairs and the (octet/ decuplet) baryon-(pseudoscalar/vector) charmed meson pairs, within a constituent quark model. Furthermore, we calculate the masses of the charmed baryon ground states and their excitations up to the $D$-wave in a constituent quark model both in the three-quark and in the quark-diquark schemes, utilizing a Hamiltonian model based on a harmonic oscillator potential plus a mass splitting term that encodes the spin, \mbox{spin-orbit}, isospin, and flavor interactions. The parameters of the Hamiltonian model are fitted to the experimental data of the charmed baryon masses and decay widths. As the experimental uncertainties of the data affect the fitted model parameters, we have thoroughly propagated these uncertainties into our predicted charmed baryon masses and decay widths via a Monte Carlo bootstrap approach, which is often absent in other theoretical studies on this subject. Our quantum number assignments and predictions of the masses and strong partial decay widths are in reasonable agreement with the available data. Thus, our results show the ability to guide future measurements in LHCb, Belle and Belle II experiments. Finally, the appendices provide some details of our calculations, in which we include the flavor coupling coefficients, which are useful for further theoretical investigations.

   hep-phPRD(2023)·41 citations
3. 03*

   Contribution of exclusive $({\pi }^0{\pi }^0,{\pi }^0\eta ,\eta \eta )\gamma$ channels to the leading order HVP of the muon $g-2$

   J. L. Gutiérrez-Santiago🇲🇽 · G. López-Castro🇲🇽

   We evaluate the contributions of $({\pi }^0{\pi }^0,{\pi }^0\eta ,\eta \eta )\gamma$ exclusive channels to the dispersion integral of the leading order HVP of the muon anomalous magnetic moment. These channels are included in some way in previous evaluations of the ${\pi }^0\omega ,\eta \omega$ and $\eta \varphi$ contributions to $a_{\mu }^{\mathrm{had},\mathrm{LO}}$, where the vector resonances (decaying into ${\pi }^0/\eta +\gamma$) are assumed to be on-shell. Since the separation of resonance and background contributions in a given observable is, in general, a model-dependent procedure, here we use pseudoscalar mesons and the photon as the $in$ and $out$ states of the $e^{+}{e}^{-}\to ({\pi }^0{\pi }^0,{\pi }^0\eta ,\eta \eta )\gamma$ $S$-matrix, such that the cross section contains the interferences among different contributing to the amplitudes. We find $a_{\mu }^{\mathrm{had},\mathrm{LO}}(P_1^0{P}_2^0\gamma )=(1.13\pm 0.13)\times 10^{-10}$, where uncertainties stem mainly from vector meson dominance model parameters. Improved experimental studies of these exclusive channels in the whole range below 2 GeV would reduce model-dependency.

   hep-phhep-exPRD(2022)·3 citations
4. 04*

   The assignments of the bottom mesons within the screened potential model and ${}^3{P}_0$ model

   Xue-Chao Feng🇨🇳 · Wei-Hao🇨🇳 · li-Juan Liu🇨🇳

   In this work, we calculate the mass spectrum of the bottom mesons with a modified nonrelativistic quark model by involving the screening effect, and explore their strong decay properties within the ${}^3{P}_0$ model. Our results suggest that the $B_1(5721)$, $B_2^{\ast }(5747)$, $B_J(5840)$, and $B_J(5970)$ could be reasonably assigned as the $B_1^{\prime }(1P)$, $B(1^3{P}_2)$, $B(2^1{S}_0)$, and $B(1^3{D}_3)$ respectively. The more precise measurements of the excited bottom mesons are crucial to confirm these assignments.

   hep-phIJMPE(2022)·8 citations
5. 05*

   Identifying the ${\Xi }_b(6100)$ as the $P$-wave bottom baryon of $J^P=3/2^{-}$

   Hui-Min Yang🇨🇳 · Hua-Xing Chen🇨🇳 · Er-Liang Cui🇨🇳 · Qiang Mao🇨🇳

   We study the ${\Xi }_b(6100)$ using the methods of QCD sum rules and light-cone sum rules within the framework of heavy quark effective theory. Our results suggest that the ${\Xi }_b(6100)$ can be well interpreted as the $P$-wave bottom baryon of $J^P=3/2^{-}$, belonging to the $SU(3)$ flavor ${\bar{3}}_F$ representation. It has a partner state of $J^P=1/2^{-}$, labelled as ${\Xi }_b(1/2^{-})$, whose mass and width are predicted to be $m_{{\Xi }_b(1/2^{-})}=6.08_{-0.11}^{+0.13}$~GeV and ${\Gamma }_{{\Xi }_b(1/2^{-})}=4_{-4}^{+29}$~MeV, with the mass splitting $\Delta M=m_{{\Xi }_b(6100)}-m_{{\Xi }_b(1/2^{-})}=9\pm 3$~MeV. We propose to search for it in the ${\Xi }_c({1/2}^{-})\to {\Xi }_b^{\prime }\pi$ decay channel. Our results also suggest that the ${\Lambda }_b(5912)$ and ${\Lambda }_b(5920)$ are their partner states with $J^P=1/2^{-}$ and $3/2^{-}$ respectively, and moreover, the ${\Lambda }_c(2595)$, ${\Lambda }_c(2625)$, ${\Xi }_c(2790)$, and ${\Xi }_c(2815)$ are their charmed partner states.

   hep-phPRD(2022)·20 citations
6. 06*

   Search for the tensor glueball

   E. Klempt🇩🇪 · A.V. Sarantsev🇩🇪 · I. Denisenko🇷🇺 · K.V. Nikonov🇩🇪

   The tensor glueball is searched for in BESIII data on radiative $J/\psi$ decays into ${\pi }^0{\pi }^0$ and $K_s{K}_s$. The $\pi \pi$ invariant mass distribution exhibits an enhancement that can be described by a pole at $(2210\pm 60)-i(180\pm 60)$\,MeV. We speculate if the tensor glueball could be distributed among high-mass tensor mesons.

   hep-phPLB(2022)·24 citations
7. 07*

   Radiative first-order phase transitions to next-to-next-to-leading order

   Andreas Ekstedt🇸🇪 · Oliver Gould🇬🇧 · Johan Löfgren🇸🇪

   We develop new perturbative tools to accurately study radiatively-induced first-order phase transitions. Previous perturbative methods have suffered internal inconsistencies and been unsuccessful in reproducing lattice data, which is often attributed to infrared divergences of massless modes (the Linde problem). We employ a consistent power counting scheme to perform calculations, and compare our results against lattice data. We conclude that the consistent expansion removes many previous issues, and indicates that the infamous Linde problem is not as big a factor in these calculations as previously thought.

   hep-phhep-thPRD(2022)·58 citations
8. 08*

   Searching for cosmic string induced stochastic gravitational wave background with the Parkes Pulsar Timing Array

   Ligong Bian🇨🇳 · Jing Shu🇨🇳 · Bo Wang🇨🇳 · Qiang Yuan🇨🇳 · Junchao Zong🇨🇳

   We search for stochastic gravitational wave background emitted from cosmic strings using the Parkes Pulsar Timing Array data over 15 years. While we find that the common power-law excess revealed by several pulsar timing array experiments might be accounted for by the gravitational wave background from cosmic strings, the lack of the characteristic Hellings-Downs correlation cannot establish its physical origin yet. The constraints on the cosmic string model parameters are thus derived with conservative assumption that the common power-law excess is due to unknown background. Two representative cosmic string models with different loop distribution functions are considered. We obtain constraints on the dimensionless string tension parameter $G\mu <10^{-11}\sim 10^{-10}$, which is more stringent by two orders of magnitude than that obtained by the high-frequency LIGO-Virgo experiment for one model, and less stringent for the other. The results provide the chance to test the Grand unified theories, with the spontaneous symmetry breaking scale of $U(1)$ being two-to-three orders of magnitude below $10^{16}$ GeV. The pulsar timing array experiments are thus quite complementary to the LIGO-Virgo experiment in probing the cosmic strings and the underlying beyond standard model physics in the early Universe.

   hep-phastro-ph.COgr-qchep-thPRD(2022)·52 citations
9. 09*

   Associated squark-electroweakino production with NLO+NLL precision

   Juri Fiaschi🇬🇧 · Benjamin Fuks🇫🇷 · Michael Klasen🇩🇪 · Alexander Neuwirth🇩🇪

   Motivated by the increased precision expected from LHC Run 3, equally accurate theory predictions are mandatory. As supersymmetry mass limits increase, predictions can be improved by threshold resummation. We examine the effects of including next-to-leading logarithms on associated squark-electroweakino production at the LHC and find a significant reduction in the uncertainty of factorisation and renormalisation scale dependence and a modest increase in the total cross section.

   hep-ph0 citations
10. 10*

    A tower of hidden sectors: a general treatment and physics implications

    Amin Aboubrahim🇩🇪 · Pran Nath🇺🇸

    An analysis of a tower of hidden sectors coupled to each other, with one of these hidden sectors coupled to the visible sector, is given and the implications of such couplings on physics in the visible sector are investigated. Thus the analysis considers $n$ number of hidden sectors where the visible sector couples only to hidden sector 1, while the latter couples also to hidden sector 2, and the hidden sector 2 couples to hidden sector 3 and so on. A set of successively feeble couplings of the hidden sectors to the visible sector are generated in such a set up. In general each of these sectors live in a different heat bath. We develop a closed form set of coupled Boltzmann equations for the correlated evolution of the temperatures and number densities of each of the heat baths. We then apply the formalism to a simplified model with scalar portals between the different sectors. Predictions related to dark matter direct detection experiments and future CMB probes of dark radiation are made.

    hep-phastro-ph.COJHEP(2022)·15 citations
11. 11*

    Leptonic $g-2$ in 2HDM

    Francisco J. Botella🇪🇸 · Fernando Cornet-Gomez🇪🇸 · Carlos Miró🇪🇸 · Miguel Nebot🇪🇸

    The experimental observations of the electron and muon anomalous magnetic moment present discrepancies with respect to the Standard Model predictions. A class of flavor conserving Two Higgs Doublet model, stable under renormalization, that is capable of explaining both anomalies simultaneously is presented. This model can also explain an excess observed by ATLAS in $\sigma (pp\to S{)}_{[\text{ggF}]}\times \text{Br}(S\to {\tau }^{+}{\tau }^{-})$.

    hep-phhep-ex1 citation
12. 12*

    Unstable Neutrinos can Relax Cosmological Mass Bounds

    Stefan Sandner🇪🇸

    The light neutrino masses are at present most stringently constraint via cosmological probes. In particular the Planck collaboration reports $\sum m_{\nu }\le 0.12\mathrm{eV}$ at $95\%$ CL within the standard cosmological model. This is more than one order of magnitude stronger than the one arising from laboratory searches. The cosmological bound taken at face value excludes a plethora of neutrino flavour models which can successfully explain the neutrino oscillation data. The indirect nature of the cosmological bound, however, allows to relax the bound to up to $\sum m_{\nu }\sim 1\mathrm{eV}$ if neutrinos decay on timescales shorter than the age of the Universe, ${\tau }_{\nu }\le t_U$. We present how a decay of the type ${\nu }_i\to {\nu }_4\varphi$ can be realized within general models of the minimal extended seesaw framework. The idea is then explicitly realized within the context of a $U(1{)}_{\mu -\tau }$ flavour model.

    hep-phastro-ph.CO0 citations
13. 13*

    Prospects for Dark Matter Search at the Super c-tau Factory

    E. E. Boos🇷🇺 · V. E. Bunichev🇷🇺 · S. S. Trykov🇷🇺

    We present perspectives for searching for light dark matter production mediated by a leptophilic scalar {\phi} and a dark photon A' in in experiments at the Super c-tau Factory. Based on the analysis of the associative production of mediators and {\tau} -leptons at the energies of the future collider, the possibility of searching in the non-excluded region of the parameter space was found. The obtained sensitivity curves at the 90% C.L. for the mediators mass range below 4 GeV demonstrate the power of the SCTF for light dark matter search.

    hep-phhep-exPRD(2023)·13 citations
14. 14*

    Is there a radio excess from the decoupling of pre-recombination bremsstrahlung?

    Josef Pradler🇦🇹

    Recently it has been suggested that thermal bremsstrahlung emission, when it decouples prior to recombination, creates an excess over the Planck cosmic microwave background spectrum at sub-GHz frequencies. Remarkable by itself, this would also explain a long-standing unexplained deficit in the predictions of the extragalactic radio background. In this brief note we reiterate that no such non-thermal component can arise by itself when matter and radiation remain kinetically coupled.

    hep-phastro-ph.CORes.Notes AAS(2022)·0 citations
15. 15*

    Three-loop topology analysis of neutral B-meson mixing with tapir

    Marvin Gerlach🇩🇪

    Modern advances in particle physics depend strongly on the usage of reliable computer programs. In this context two issues become important: The usage of powerful algorithms to handle the amount of evaluated data properly, and a software architecture capable to overcome the problems of maintainability and extendability. We present our approach to such a computer program, called tapir. This tool assists computations in perturbative quantum field theory in many ways. Such calculations often involve the evaluation of a large amount of Feynman diagrams with multiple loops. tapir helps in reducing the number of diagrams, and the resulting integrals thereof, by identifying and minimizing their topological structure. We will focus on a three-loop calculation which is needed for the next-to-next-to leading order predictions of neutral $B$-meson systems. We show how tapir can be utilized for this kind of calculation.

    hep-phJ.Phys.Conf.Ser.(2023)·3 citations
16. 16*

    The role of dineutrino modes in the search for new physics

    Hector Gisbert🇩🇪

    Dineutrino modes offer promising searches for new physics. The potential aspects of these modes are reviewed in detail. Performing a proper combination of them, novel tests of the SM symmetries are derived. Different phenomenological applications are worked out, including charm, beauty and kaons, which result in novel tests of lepton universality and charged lepton flavour conservation with flavour-summed dineutrino observables, in addition to improved bounds on $\tau \ell$ couplings with $\ell =e,\mu ,\tau$.

    hep-ph0 citations
17. 17*

    Constraining super-light sterile neutrinos at Borexino and KamLAND

    Zikang Chen🇨🇳 · Jiajun Liao🇨🇳 · Jiajie Ling🇨🇳 · Baobiao Yue🇨🇳

    The presence of a super-light sterile neutrino can lead to a dip in the survival probability of solar neutrinos, and explain the suppression of the upturn in the low energy solar neutrino data. In this work, we systematically study the survival probabilities in the 3+1 framework by taking into account of the non-adiabatic transitions and the coherence effect. We obtain an analytic equation that can predict the position of the dip. We also place constraints on the parameter space of sterile neutrinos by using the latest Borexino and KamLAND data. We find that the low and high energy neutrino data at Borexino are sensitive to different regions in the sterile neutrino parameter space. In the case with only ${\theta }_{01}$ being nonzero, the ${}^8\mathrm{B}$ data sets the strongest bounds at $\Delta m_{01}^2\approx (1.1\sim 2.2)\Delta m_{21}^2$, while the low energy neutrino data is more sensitive to other mass-squared regions. The lowest bounds on $\Delta m_{01}^2$ from the $\mathrm{pp}$ data can reach $10^{-12}\mathrm{e}{\mathrm{V}}^2$ because of the coherence effect. Also, due to the presence of non-adiabatic transitions, the bounds in the range of $10^{-9}{\text{eV}}^2\lesssim \Delta m_{01}^2\lesssim 10^{-5}{\text{eV}}^2$ become weaker as $\Delta m_{01}^2$ or ${\sin }^{2}2{\theta }_{01}$ decreases. We also find that in the case with only ${\theta }_{02}$ or ${\theta }_{03}$ being nonzero, the low energy solar neutrino data set similar but weaker bounds as compared to the case with only ${\theta }_{01}$ being nonzero. However, the bounds from the high energy solar data and the KamLAND data are largely affected by the sterile mixing angles.

    hep-phJHEP(2022)·12 citations
18. 18*

    A natural mechanism for a SM-like Higgs boson in the 2HDM without decoupling

    Howard E. Haber🇺🇸

    The properties of the Higgs boson discovered at the Large Hadron Collider are very well described by the Standard Model (SM). Thus, any theory that invokes an extended Higgs sector must explain why the neutral scalar observed at the LHC so closely resembles the SM Higgs boson. In this talk, I review the Higgs alignment limit, in which one neutral scalar state of the Higgs sector is SM-like. An approximate Higgs alignment can be achieved "naturally" either via decoupling or via an approximate symmetry. Using the two-Higgs doublet model as a prototype for an extended Higgs sector, I examine the symmetries of the scalar potential and their soft breakings that may be responsible for the SM-like properties of the observed Higgs boson, and I demonstrate how to extend such (softly-broken) symmetries to the Yukawa sector of the model.

    hep-phPoS(2022)·3 citations
19. 19*

    Systematical study of ${\Omega }_c$-like molecular states from interactions ${\Xi }_c^{{(}^{\prime },\ast )}{\bar{K}}^{(\ast )}$ and ${\Xi }^{(\ast )}{D}^{(\ast )}$

    Jun-Tao Zhu🇨🇳 · Shu-Yi Kong🇨🇳 · Lin-Qing Song🇨🇳 · Jun He🇨🇳

    In this work, the ${\Omega }_c$-like molecular states are systematically investigated in a quasipotential Bethe-Salpeter equation approach. The relevant interactions ${\Xi }_c^{(\ast {,}^{\prime })}{\bar{K}}^{(\ast )}$, ${\Xi }^{(\ast )}{D}^{(\ast )}$, and ${\Omega }_c^{(\ast )}(\pi /\eta /\rho /\omega )$ are described by light meson exchanges with the help of the effective Lagrangians with SU(3), chiral, and heavy quark symmetries. The obtained potential kernels of considered interactions are inserted into the quasipotential Bethe-Salpeter equation, and coupled-channel calculations are performed to find possible molecular states and its couplings to the channels considered. The results suggest that an isoscalar state can be produced from the ${\Xi }_c^{\ast }\bar{K}$ interaction with spin parity $3/2^{-}$, which can be related to state ${\Omega }_c(3120)$. And its isoscalar partner is predicted with a dominant decay in the ${\Omega }_c^{\ast }\pi$ channel. The isoscalar and isovector states with $1/2^{-}$ can be produced from the ${\Xi }_c^{\prime }\bar{K}$ interaction with a threshold close to the mass of the ${\Omega }_c(3050)$ and ${\Omega }_c(3065)$. Their couplings to the ${\Xi }_c\bar{K}$ channel are very weak, and the isovector one has strong coupling to ${\Omega }_c\pi$. High precision measurement is helpful to confirm or search such molecular states. Experimental search of states with higher masses generated from interactions ${\Xi }_c^{(\ast {,}^{\prime })}{\bar{K}}^{\ast }$ and ${\Xi }^{\ast }{D}^{(\ast )}$ are also suggested by the current results.

    hep-phPRD(2022)·16 citations
20. 20*

    Violations of Quark-Hadron Duality in Low-Energy Determinations of ${\alpha }_s$

    Antonio Pich🇪🇸 · Antonio Rodríguez-Sánchez🇫🇷

    Using the spectral functions measured in $\tau$ decays, we investigate the actual numerical impact of duality violations on the extraction of the strong coupling. These effects are tiny in the standard ${\alpha }_s(m_{\tau }^2)$ determinations from integrated distributions of the hadronic spectrum with pinched weights, or from the total $\tau$ hadronic width. The pinched-weight factors suppress very efficiently the violations of duality, making their numerical effects negligible in comparison with the larger perturbative uncertainties. However, combined fits of ${\alpha }_s$ and duality-violation parameters, performed with non-protected weights, are subject to large systematic errors associated with the assumed modelling of duality-violation effects. These uncertainties have not been taken into account in the published analyses, based on specific models of quark-hadron duality.

    hep-phhep-exJHEP(2022)·26 citations
21. 21*

    The ${\psi }^{(\ast )}p$ scattering length based on near-threshold charmoniums photoproduction

    Xiao-Yun Wang🇨🇳 · Fancong Zeng🇨🇳 · Igor I. Strakovsky🇺🇸

    Under the framework of Vector Meson Dominance model, the value of scattering length can be expressed as a function of the ratio between total cross section $\sigma (W)$ and $R(W)$, where $R(W)$ is the ratio between final momentum $|{\mathbf{p}}_3|$ and initial momentum $|{\mathbf{p}}_1|$ and positively correlated with the center-of-mass energy. Based on the theoretical study of charmoniums photoproduction within two gluon exchange model and effective pomeron model, we research the scattering lengths of vector mesons and proton interaction in this work. Results show that the scattering length $\left|{\alpha }_{J/\psi p}\right|$ obtained from the two models are close and basically in agreement with the theoretical prediction of Strakovsky and co-workers. Additionally, we first calculate the scattering length of $\psi (2S)$-proton interaction in two gluon exchange model and effective pomeron model as $1.31\pm 0.92$ am (1 am = $10^{-3}$ fm) and $3.24\pm 0.63$ am, respectively. This is a little bit different from the two models and requires precise measurements from subsequent experiments. In short, our results will provide a theoretical reference for future studies on characterizing the vector meson-proton scattering length.

    hep-phPRC(2022)·20 citations
22. 22*

    Multi-Species Thermalization Cascade of Energetic Particles in the Early Universe

    Manuel Drees🇩🇪 · Bardia Najjari🇩🇪

    Heavy long-lived particles are abundant in BSM physics and will, under generic circumstances, get to dominate the energy density of the universe. The resulting matter dominated era has to end before the onset of Big Bang Nucleosynthesis through the decay of the heavy matter component of mass $M$ into a thermal bath of temperature $T$. The process of thermalization primarily involves near-collinear splittings of energetic particles into two particles with lower energy. The correct treatment of these processes requires the inclusion of coherence effects which suppress the splitting rate. We write down and numerically solve the resulting coupled Boltzmann equations including all gauge bosons and fermions of the Standard Model (SM). We then comment on the dependence of the nonthermal spectra on the ratio $M/T$, as well as on the matter decay rate and branching ratios into various SM particles.

    hep-phastro-ph.COJCAP(2023)·26 citations
23. 23*

    Remarks on the penguin decay $B_s\to \varphi \varphi$ with prospects for FCCee

    R. Aleksan🇫🇷 · L. Oliver🇫🇷

    We underline the theoretical interest of the vector-vector penguin decay $B_s\to \varphi \varphi$, very clean from the experimental point of view. The CP-violation asymmetry $A_{CP}^{mix}$ comes from the interference of mixing and decay ${\lambda }_{\varphi \varphi }=\frac{q}{p}\frac{\bar{A}}{A}$. In the Standard Model (SM) and in the Naive Factorization limit, the CP phase from the mixing $\frac{q}{p}$ exactly cancels the CP phase from the decay ratio $\frac{\bar{A}}{A}$. Therefore, this mode is suitable to look for possible New Physics (NP) because $A_{CP}^{mix}$ would directly indicate the departure from the SM in mixing. We estimate the deviation from this cancellation by analyzing possible small effects in the SM, using in particular the QCD Factorization scheme. We compare the theoretical expectation for $A_{CP}^{mix}$ to the measurement of LHCb, and the implications for NP. We pay also special attention to the transverse amplitude $h=-$, the longitudinal and transverse polarization fractions, and the interesting helicity-dependent observables ${\lambda }_{\varphi \varphi }^{h=0}$ and ${\lambda }_{\varphi \varphi }^{h=-}$. On the other hand, we make an estimation of the expected sensitivity at the future FCCee experiment for the CP phase and modulus of ${\lambda }_{\varphi \varphi }$. We find $\delta (\mid {\lambda }_{\varphi \varphi }\mid )=0.004$ and $\delta ({\varphi }_{\varphi \varphi })=0.009$ rad and, comparing to the LHCb data, we point out the expectations at FCCee in the search of NP.

    hep-phhep-ex4 citations
24. 24*

    Exclusive production of a pair of high transverse momentum photons in pion-nucleon collisions for extracting generalized parton distributions

    Jian-Wei Qiu🇺🇸 · Zhite Yu🇺🇸

    We show that exclusive production of a pair of high transverse momentum photons in pion-nucleon collisions can be systematically studied in QCD factorization approach if the photon's transverse momentum $q_T$ with respect to the colliding pion is much greater than ${\Lambda }_{\mathrm{QCD}}$. We demonstrate that the leading power non-perturbative contributions to the scattering amplitudes of this exclusive process are process-independent and can be systematically factorized into universal pion's distribution amplitudes (DAs) and nucleon's generalized parton distributions (GPDs), which are convoluted with corresponding infrared safe and perturbatively calculable short-distance hard parts. The correction to this factorized expression is suppressed by powers of $1/q_T$. We demonstrate quantitatively that this new type of exclusive processes is not only complementary to existing processes for extracting GPDs, but also capable of providing an enhanced sensitivity to the dependence of both DAs and GPDs on the active parton's momentum fraction $x$. We also introduce additional, but the same type of exclusive observables to enhance our capability to explore GPDs, in particular, their $x$-dependence.

    hep-phhep-latnucl-thJHEP(2022)·68 citations
25. 25*

    Laser-assisted charged Higgs boson decay in Two Higgs Doublet Model -- type II

    S. Mouslih🇲🇦 · M. Jakha🇲🇦 · S. El Asri🇲🇦 · S. Taj🇲🇦 · B. Manaut🇲🇦 · R. Benbrik🇲🇦 · E Siher🇲🇦

    In this paper, we investigate the charged Higgs boson decay in the context of the type-II two-Higgs-doublet model in the presence of a circularly polarized electromagnetic field of laser radiation. The calculations are performed by adopting the Furry picture approach of non-perturbative interactions with the external electromagnetic field. Using the method of exact solutions for charged particles states in the presence of a circularly polarized electromagnetic wave field and evaluating the $S$-matrix elements, an exact analytic expression is derived for the decay width of leptonic, hadronic and bosonic decay modes. The branching ratios of different decay modes with multiple photon emission and absorption from the laser beam are analyzed and found to be dramatically modified in the region of superstrong fields. The dependencies of the decay width on the laser field strength and frequency are also examined. The results obtained may be interesting for future experimental and theoretical investigations.

    hep-phPLB(2022)·7 citations
26. 26*

    Strong supernovae bounds on ALPs from quantum loops

    Ricardo Z. Ferreira🇪🇸 · M.C. David Marsh🇸🇪 · Eike Müller🇸🇪

    We show that in theories of axionlike particles (ALPs) coupled to electrons at tree-level, the one-loop effective coupling to photons is process dependent: the effective coupling relevant for decay processes, $g_{a\gamma }^{\text{(D)}}$, differs significantly from the coupling appearing in the phenomenologically important Primakoff process, $g_{a\gamma }^{\text{(P)}}$. We show that this has important implications for the physics of massive ALPs in hot and dense environments, such as supernovae. We derive, as a consequence, new limits on the ALP-electron coupling, ${\hat{g}}_{ae}$, from SN 1987A by accounting for all relevant production processes, including one-loop processes, and considering bounds from excess cooling as well as the absence of an associated gamma-ray burst from ALP decays. Our limits are among the strongest to date for ALP masses in the range $0.03\text{MeV}<m_a<240\text{MeV}$. Moreover, we also show how cosmological bounds on the ALP-photon coupling translate into new, strong limits on ${\hat{g}}_{ae}$ at one loop. Our analysis emphasises that large hierarchies between ALP effective couplings are difficult to realise once quantum loops are taken into account.

    hep-phastro-ph.HEJCAP(2022)·76 citations
27. 27*

    Quantum Simulation of Light-Front QCD for Jet Quenching in Nuclear Environments

    Xiaojun Yao🇺🇸

    We develop a framework to simulate jet quenching in nuclear environments on a quantum computer. The formulation is based on the light-front Hamiltonian dynamics of QCD. The Hamiltonian consists of three parts relevant for jet quenching studies: kinetic, diffusion and splitting terms. In the basis made up of $n$-particle states in momentum space, the kinetic Hamiltonian is diagonal. Matrices representing the diffusion and splitting parts are sparse. The diffusion part of the Hamiltonian depends on classical background gauge fields, which need to be sampled classically before constructing quantum circuits for the time evolution. The cost of the sampling scales linearly with the time length of the evolution and the momentum grid volume. The framework automatically keeps track of quantum interference and thus it can be applied to study the Landau-Pomeranchuk-Migdal effect in cases with more than two coherent splittings, which is beyond the scope of state-of-the-art analyses, no matter whether the medium is static or expanding, thin or thick, hot or cold. We apply this framework to study a toy model and gluon in-medium radiation on a small lattice. The essence of the Landau-Pomeranchuk-Migdal effect is observed in the quantum simulation results of both the toy model and the gluon case, which is quantum decoherence caused by medium interactions that suppresses the total radiation probability.

    hep-phhep-latnucl-thquant-ph23 citations
28. 28*

    The width difference in the $B-\bar{B}$ system at next-to-next-to-leading order of QCD

    Marvin Gerlach🇩🇪 · Ulrich Nierste🇩🇪 · Vladyslav Shtabovenko🇩🇪 · Matthias Steinhauser🇩🇪

    We extend the theoretical prediction for the width difference $\Delta {\Gamma }_q$ in the mixing of neutral $B$ mesons in the Standard Model to next-to-next-to-leading order in ${\alpha }_s$. To this aim we calculate three-loop diagrams with two $|\Delta B|=1$ current-current operators analytically. In the matching between $|\Delta B|=1$ and $|\Delta B|=2$ effective theories we regularize the infrared divergences dimensionally and take into account all relevant evanescent operators. Further elements of the calculation are the two-loop renormalization matrix $Z_{ij}$ for the $|\Delta B|=2$ operators and the $\mathcal{O}({\alpha }_s^2)$ corrections to the finite renormalization that ensures the $1/m_b$ suppression of the operator $R_0$ at two-loop order. Our theoretical prediction reads $\Delta {\Gamma }_s/\Delta M_s=(4.33\pm 0.93)\cdot 10^{-3}$ if expressed in terms of the bottom mass in the $\overline{\mathrm{MS}}$ scheme and $\Delta {\Gamma }_s/\Delta M_s=(4.20\pm 0.95)\cdot 10^{-3}$ for the use of the potential-subtracted mass. While the controversy on $|V_{cb}|$ affects both $\Delta {\Gamma }_s$ and $\Delta M_s$, the ratio $\Delta {\Gamma }_s/\Delta M_s$ is not affected by the uncertainty in $|V_{cb}|$ .

    hep-phPRL(2022)·26 citations
29. 29*

    Possible triply heavy tetraquark states

    Xuejie Liu🇨🇳 · Yue Tan🇨🇳 · Dianyong Chen🇨🇳 · Hongxia Huang🇨🇳 · Jialun Ping🇨🇳

    In the present work, the triply heavy tetraquarks states $QQ\bar{Q}\bar{q}$ with $Q=(c,b)$ and $q=(u,d,s)$ with all possible quantum numbers are systematically investigated in the framework of the chiral quark model with the resonance ground method. Two kinds of structures, including the meson-meson configuration (the color-singlet channels and the hidden-color channels) and the diquark-antidiquark configuration (the color sextet-antisextet and the color triplet-antitriplet), are considered. In the considered system, several bound states are obtained for the $cc\bar{c}\overline{q^{{}^{\prime }}}$, $bb\bar{c}\overline{q^{{}^{\prime }}}$ and $bc\bar{c}\bar{q}$ tetraquarks. From the present estimations, we find that the coupled channel effect is of great significance for forming the below thresholds tetraquark states, which are stable for strong decays.

    hep-phPRD(2023)·9 citations
30. 30*

    Topological indices of general relativity and Yang-Mills theory in four-dimensional space-time

    Yoshimasa Kurihara🇯🇵

    This report investigates general relativity and the Yang-Mills theory in four-dimensional space-time using a common mathematical framework, the Chern-Weil theory for principal bundles. The whole theory is described owing to the fibre bundle with the GL(4) symmetry by twisting several principal bundles with the gauge symmetry. In addition to the principal connection, we introduce the Hodge-dual connection into the Lagrangian to make gauge fields have dynamics independent from the Bianchi identity. We show that the duplex superstructure appears in the bundle when a Z2-grading operator exists in the total space of the bundle in general. The Dirac operator appears in the secondary superspace using the one-dimensional Clifford algebra, and it provides topological indices from the Atiyah-Singer index theorem. Though the topological index is usually discussed in the elliptic-type manifold, this report treats it in the hyperbolic-type space-time manifold using a novel method, the theta-metric space. The theta-metric treats the Euclidean and Minkowski spaces simultaneously and defines the topological index in the Minkowski space-time.

    ↳ gr-qchep-ph2 citations
31. 31*

    Geminga contribution to the cosmic-ray positron excess according to the gamma-ray observations

    Guang-Yao Zhou🇨🇳 · Zhao-Huan Yu🇨🇳 · Qiang Yuan🇨🇳 · Hong-Hao Zhang🇨🇳

    We attempt to interpret the cosmic-ray positron excess by injection from the nearby pulsar Geminga, assuming a two-zone diffusion scenario and an injection spectrum with a low energy cutoff. Since the high energy positrons and electrons from Geminga can induce $\gamma$ rays via inverse Compton scattering, we take into account the extended $\gamma$-ray observations around Geminga from HAWC for $\sim 10$ TeV and from Fermi-LAT for $\mathcal{O}(10)$ GeV. According to the extended $\gamma$-ray observation claimed by an analysis of Fermi-LAT data, we find that Geminga could explain the positron excess for a $30\%$ energy conversion efficiency into positrons and electrons. However, based on the constraint on the extended $\gamma$ rays given by another Fermi-LAT analysis, positrons from Geminga would be insufficient to account for the positron excess. A further robust analysis of Fermi-LAT data for the extended $\gamma$ rays would be crucial to determine whether Geminga can explain the positron excess or not.

    ↳ astro-ph.HEhep-phCommun.Theor.Phys.(2022)·5 citations
32. 32*

    Search for the Gravitational-wave Background from Cosmic Strings with the Parkes Pulsar Timing Array Second Data Release

    Zu-Cheng Chen🇨🇳 · Yu-Mei Wu🇨🇳 · Qing-Guo Huang🇨🇳

    We perform a direct search for an isotropic stochastic gravitational-wave background (SGWB) produced by cosmic strings in the Parkes Pulsar Timing Array second data release. We find no evidence for such an SGWB, and therefore place $95\%$ confidence level upper limits on the cosmic string tension, $G\mu$, as a function of the reconnection probability, $p$, which can be less than 1 in the string-theory-inspired models. The upper bound on the cosmic string tension is $G\mu \lesssim 5.1\times 10^{-10}$ for $p=1$, which is about five orders of magnitude tighter than the bound derived from the null search of individual gravitational wave burst from cosmic string cusps in the PPTA DR2.

    ↳ astro-ph.COgr-qchep-phhep-thApJ(2022)·61 citations
33. 33*

    Hunting for extra dimensions in the shadow of Sagittarius A*

    Di Wu🇨🇳

    Recently, Vagnozzi and Visinelli's work [Phys. Rev. D 100, 024020 (2020)] reveals that M87*'s shadow establishes an upper limit of $l\lesssim 170$ AU, where $l$ is the AdS${}_5$ curvature radius and 1 AU is one astronomical unit. The Event Horizon Telescope, on the other hand, just captured the first image of the shadow of Sagittarius A* (SgrA*), the Galactic center source associated with a supermassive black hole. In this paper, we are motivated to comprehensively explore a new upper limit of $l$ with the shadow of SgrA*, and the findings suggest that $l\lesssim 0.097$ AU. Our results improve accuracy by three orders of magnitude. This is also one of the first quantifiable limitations on exotic physics derived from the remarkable first image of the shadow of SgrA*.

    ↳ gr-qchep-ph4 citations
34. 34*

    First-order electroweak phase transitions: a nonperturbative update

    Oliver Gould🇬🇧 · Sinan Güyer🇫🇮 · Kari Rummukainen🇫🇮

    We study first-order electroweak phase transitions nonperturbatively, assuming any particles beyond the Standard Model are sufficiently heavy to be integrated out at the phase transition. Utilising high temperature dimensional reduction, we perform lattice Monte-Carlo simulations to calculate the main quantities characterising the transition: the critical temperature, the latent heat, the surface tension and the bubble nucleation rate, updating and extending previous lattice studies. We focus on the region where the theory gives first-order phase transitions due to an effective reduction in the Higgs self-coupling and give a detailed comparison with perturbation theory.

    ↳ hep-latastro-ph.COhep-phPRD(2022)·91 citations
35. 35*

    Fluctuations in the canonical ensemble of an Abelian charge

    Bengt Friman (Darmstadt, GSI)🇩🇪 · Krzysztof Redlich (Wroclaw U.)🇵🇱

    We study fluctuations in the canonical ensemble, where the net baryon number is exactly conserved. The focus is on cumulants and factorial cumulants linked to the baryon and antibaryon multiplicities and their sum or difference in full phase-space as well as in subsystems. In particular, we connect the fluctuations of the net baryon number in a subsystem, relevant for fluctuation studies in nucleus-nucleus collisions, with fluctuations of the baryon and antibaryon numbers of the total system. We derive analytic expressions for factorial cumulants of arbitrary order. Compact results are obtained in terms of cumulants of the baryon number of the total system. Moreover, we derive the asymptotic forms of the factorial cumulants of baryon and antibaryon multiplicities in the high- and low-temperature limits and discuss the results in the context of heavy-ion collision experiments.

    ↳ nucl-thhep-ph7 citations
36. 36*

    Conservative Binary Dynamics with a Spinning Black Hole at $\mathcal{O}(G^3)$ from Scattering Amplitudes

    Fernando Febres Cordero🇺🇸 · Manfred Kraus🇺🇸 · Guanda Lin🇨🇳 · Michael S. Ruf🇺🇸 · Mao Zeng🇬🇧

    We compute the conservative two-body Hamiltonian of a compact binary system with a spinning black hole through $\mathcal{O}(G^3)$ to all orders in velocity, including linear and quadratic spin terms. To obtain our results we calculate the classical limit of the two-loop amplitude for the scattering of a massive scalar particle with a massive spin-1 particle minimally coupled to gravity. We employ modern scattering amplitude and loop integration techniques, in particular numerical unitarity, integration-by-parts identities, and the method of regions. The conservative potential in terms of rest-frame spin vectors is extracted by matching to a non-relativistic effective field theory. We also apply the Kosower-Maybee-O'Connell (KMOC) formalism to calculate the impulse in the covariant spin formalism directly from the amplitude. We work systematically in conventional dimensional regularization and explicitly evaluate all divergent integrals that appear in full- and effective-theory amplitudes, as well as in the phase-space integrals that arise in the KMOC formalism.

    ↳ hep-thhep-phPRL(2023)·113 citations
37. 37*

    Continuum limit of parton distribution functions from the pseudo-distribution approach on the lattice

    Manjunath Bhat🇵🇱 · Wojciech Chomicki🇵🇱 · Krzysztof Cichy🇵🇱 · Martha Constantinou🇺🇸 · Jeremy R. Green🇮🇪 · Aurora Scapellato🇺🇸

    Precise quantification of the structure of nucleons is one of the crucial aims of hadronic physics for the coming years. The expected progress related to ongoing and planned experiments should be accompanied by calculations of partonic distributions from lattice QCD. While key insights from the lattice are expected to come for distributions that are difficult to access experimentally, it is important that lattice QCD can reproduce the well-known unpolarized parton distribution functions (PDFs) with full control over systematic uncertainties. One of the novel methods for accessing the partonic $x$-dependence is the pseudo-distribution approach, which employs matrix elements of a spatially-extended nonlocal Wilson-line operator of length $z$. In this paper, we address the issue of discretization effects, related to the necessarily nonzero value of the lattice spacing $a$, which start at first order in $a$ as a result of the nonlocal operator. We use twisted mass fermions simulated at three values of the lattice spacing, at a pion mass of 370 MeV, and extract the continuum limit of isovector unpolarized PDFs. We also test, for the first time in the pseudo-distribution approach, the effects of the recently derived two-loop matching. Finally, we address the issue of the reliability of the extraction with respect to the maximal value of $z$.

    ↳ hep-lathep-phPRD(2022)·32 citations
38. 38*

    Snowmass White Paper: Prospects of CP-violation measurements with the Higgs boson at future experiments

    A. V. Gritsan🇺🇸 · H. Bahl🇺🇸 · R. K. Barman🇺🇸 · I. Bozovic-Jelisavcic🇷🇸 · J. Davis🇺🇸 · W. Dekens🇺🇸 · Y. Gao🇬🇧 · D. Goncalves🇺🇸 · L. S. Mandacaru Guerra🇺🇸 · D. Jeans🇯🇵 · K. Kong🇺🇸 · S. Kyriacou🇺🇸 and 6 other authors

    The search for CP violation in interactions of the Higgs boson with either fermions or bosons provides attractive reference measurements in the Particle Physics Community Planning Exercise (a.k.a. "Snowmass"). Benchmark measurements of CP violation provide a limited and well-defined set of parameters that could be tested at the proton, electron-positron, photon, and muon colliders, and compared to those achieved through study of virtual effects in electric dipole moment measurements. We review the current status of these CP-sensitive studies and provide projections to future measurements.

    ↳ hep-exhep-ph41 citations
39. 39*

    Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A${}^{\ast }$

    Sunny Vagnozzi🇮🇹 · Rittick Roy🇨🇳 · Yu-Dai Tsai🇺🇸 · Luca Visinelli🇨🇳 · Misba Afrin🇮🇳 · Alireza Allahyari🇮🇷 · Parth Bambhaniya · Dipanjan Dey🇨🇦 · Sushant G. Ghosh🇮🇳 · Pankaj S. Joshi🇮🇳 · Kimet Jusufi🇲🇰 · Mohsen Khodadi🇮🇷 and 3 other authors

    Horizon-scale images of black holes (BHs) and their shadows have opened an unprecedented window onto tests of gravity and fundamental physics in the strong-field regime. We consider a wide range of well-motivated deviations from classical General Relativity (GR) BH solutions, and constrain them using the Event Horizon Telescope (EHT) observations of Sagittarius A${}^{\ast }$ (Sgr A${}^{\ast }$), connecting the size of the bright ring of emission to that of the underlying BH shadow and exploiting high-precision measurements of Sgr A${}^{\ast }$'s mass-to-distance ratio. The scenarios we consider, and whose fundamental parameters we constrain, include various regular BHs, string-inspired space-times, violations of the no-hair theorem driven by additional fields, alternative theories of gravity, novel fundamental physics frameworks, and BH mimickers including well-motivated wormhole and naked singularity space-times. We demonstrate that the EHT image of Sgr A${}^{\ast }$ places particularly stringent constraints on models predicting a shadow size larger than that of a Schwarzschild BH of a given mass, with the resulting limits in some cases surpassing cosmological ones. Our results are among the first tests of fundamental physics from the shadow of Sgr A${}^{\ast }$ and, while the latter appears to be in excellent agreement with the predictions of GR, we have shown that a number of well motivated alternative scenarios, including BH mimickers, are far from being ruled out at present.

    ↳ gr-qcastro-ph.HEhep-phhep-thClass.Quant.Grav.(2023)·1008 citations
40. 40*

    Cosmological Bound on the QCD Axion Mass, Redux

    Francesco D'Eramo🇮🇹 · Eleonora Di Valentino🇬🇧 · William Giarè🇮🇹 · Fazlollah Hajkarim🇮🇹 · Alessandro Melchiorri🇮🇹 · Olga Mena🇪🇸 · Fabrizio Renzi🇳🇱 · Seokhoon Yun🇮🇹

    We revisit the joint constraints in the mixed hot dark matter scenario in which both thermally produced QCD axions and relic neutrinos are present. Upon recomputing the cosmological axion abundance via recent advances in the literature, we improve the state-of-the-art analyses and provide updated bounds on axion and neutrino masses. By avoiding approximate methods, such as the instantaneous decoupling approximation, and limitations due to the limited validity of the perturbative approach in QCD that forced to artificially divide the constraints from the axion-pion and the axion-gluon production channels, we find robust and self-consistent limits. We investigate the two most popular axion frameworks: KSVZ and DFSZ. From Big Bang Nucleosynthesis (BBN) light element abundances data we find for the KSVZ axion $\Delta N_{\mathrm{eff}}<0.31$ and an axion mass bound $m_a<0.53$ eV (i.e., a bound on the axion decay constant $f_a>1.07\times 10^7$ GeV) both at $95\%$ CL. These BBN bounds are improved to $\Delta N_{\mathrm{eff}}<0.14$ and $m_a<0.16$ eV ($f_a>3.56\times 10^7$ GeV) if a prior on the baryon energy density from Cosmic Microwave Background (CMB) data is assumed. When instead considering cosmological observations from the CMB temperature, polarization and lensing from the Planck satellite combined with large scale structure data we find $\Delta N_{\mathrm{eff}}<0.23$, $m_a<0.28$ eV ($f_a>2.02\times 10^7$ GeV) and $\sum m_{\nu }<0.16$ eV at $95\%$ CL. This corresponds approximately to a factor of $5$ improvement in the axion mass bound with respect to the existing limits. Very similar results are obtained for the DFSZ axion. We also forecast upcoming observations from future CMB and galaxy surveys, showing that they could reach percent level errors for $m_a\sim 1$ eV.

    ↳ astro-ph.COhep-phJCAP(2022)·89 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.