Wed·Nov 9, 2022Wednesday·November 9, 2022

1. 01*

   QCD resummation for groomed jet observables at NNLL+NLO

   Mrinal Dasgupta🇬🇧 · Basem Kamal El-Menoufi🇬🇧 · Jack Helliwell🇬🇧

   We use a direct QCD approach to carry out the next-to-next-to-leading logarithmic (NNLL) resummation for observables groomed with the modified mass-drop tagger (Soft Drop $\beta =0$). We focus on observables which are additive given an arbitrary number of soft-collinear emissions. For this class of observables, we arrange the structure of the NNLL terms into two distinct categories. The first defines a simplified inclusive tagger, whereby the NNLL collinear structure is directly related to ungroomed observables. The second defines a clustering correction which takes a particularly simple form when the Cambridge-Aachen (C/A) algorithm is used to cluster the jets. We provide, in addition to the QCD resummation of groomed jet mass, the first NNLL resummed predictions, matched to NLO, for a range of groomed jet angularities with mMDT grooming. Moreover, we also include for the first time in the same calculation, finite $z_{\mathrm{cut}}$ effects computed at NLL level alongside the small $z_{\mathrm{cut}}$ NNLL results which simultaneously improves upon both of the calculations used for groomed jet mass phenomenological studies to date. While for simplicity we focus on $e^{+}{e}^{-}$ collisions, the essential NNLL resummation we develop is process independent and hence with the appropriate NLO matching our results are also applicable for hadron collider phenomenology.

   hep-phJHEP(2023)·19 citations
2. 02*

   Bounds on quark mixing, $M_{Z^{\prime }}$ and $Z-Z^{\prime }$ mixing angle from flavor changing neutral processes in a 3-3-1 model

   Vinícius Oliveira🇧🇷 · C. A. de S. Pires🇧🇷

   Meson and anti-meson mixing processes constitute an important source of constraints on models that give tree level contributions to flavor violating neutral processes. In electroweak $\text{SU}(3{)}_{\text{L}}\times \text{U}(1{)}_N$ models, where anomaly cancellation requires that one family of quarks transforms differently from the other ones, processes involving flavor changing neutral currents gain tree level contributions mediated by gauge and scalar fields. Here, we firstly investigate the contributions of the neutral scalar that mimics the standard Higgs to the $K^0-{\bar{K}}^0$, $B^0-{\bar{B}}^0$, and $D^0-{\bar{D}}^0$ mixing processes and confront our predictions with experiments. The results will determine the quark mixing matrices $V_L^{u,d}$. In possession of this information we, next, evaluate the contributions of the neutral gauge bosons $Z^{\prime }$ and $Z$ to the $K^0-{\bar{K}}^0$, $B^0-{\bar{B}}^0$, and $D^0-{\bar{D}}^0$ processes. This realistic approach to meson transitions will provide severe bounds on $M_{Z^{\prime }}$ and $Z-Z^{\prime }$ mixing angle.

   hep-phPLB(2023)·10 citations
3. 03*

   Light double-gluon hybrid states from QCD sum rules

   Niu Su🇨🇳 · Hua-Xing Chen🇨🇳 · Wei Chen🇨🇳 · Shi-Lin Zhu🇨🇳

   We study the double-gluon hybrid states with the quark-gluon contents $\bar{q}qgg$ ($q=u/d$) and $\bar{s}sgg$. We construct twelve double-gluon hybrid currents with various quantum numbers, five of which are found to be zero due to some internal symmetries between the two gluon fields. We use the rest seven currents to perform QCD sum rule analyses. Especially, the masses of the double-gluon hybrid states with the exotic quantum number $J^{PC}=2^{+-}$ are calculated to be $M_{|\bar{q}qgg;2^{+-}⟩}=2.26_{-0.25}^{+0.20}$ GeV and $M_{|\bar{s}sgg;2^{+-}⟩}=2.38_{-0.25}^{+0.19}$ GeV. Their two- and three-meson decay patterns are also investigated.

   hep-phhep-exhep-latPRD(2023)·11 citations
4. 04*

   Simulation of Dark Bremsstrahlung in GEANT4

   Tom Eichlersmith🇺🇸 · Jeremiah Mans🇺🇸 · Omar Moreno🇺🇸 · Joseph Muse🇺🇸 · Michael Revering🇺🇸 · Natalia Toro🇺🇸

   A technique for the simulation of dark bremsstrahlung for electrons and muons in GEANT4 is presented. The total cross section is calculated using the Weizsäcker-Williams approximation and the outgoing kinematics are produced by scaling events produced in MadGraph/MadEvent to lower incident lepton energies, allowing the simulation to account for thick targets and lepton sources without fixed energies. Compared with dedicated samples produced at an arbitrary particle energy, typical precision of better than 5% is achieved.

   hep-phhep-exComput.Phys.Commun.(2023)·11 citations
5. 05*

   Resonant Vector Dark Matter Production during Inflation

   Neil D. Barrie🇰🇷

   We present a new mechanism for generating the observed dark matter energy density, through resonant production of vector dark matter during inflation. Resonant amplification of the vector dark matter is achieved through Mathieu instabilities induced by an oscillatory coupling with the inflaton, which can occur as early as 11.9 e-folds before the end of inflation. Successful dark matter production is possible for a wide range of inflationary Hubble rates and vector mass scales. This scenario generates both helicity states of the vector dark matter density in contrast to other tachyonic production mechanisms, while exhibiting large parameter regions with negligible energy density generated in the longitudinal mode. The discovery of this dark matter candidate will not only explain the nature of dark matter but provide insight into the inflationary potential and the scale of inflation. The allowed parameter space is surveyed and the unique phenomenological implications are discussed, which include gravitational waves and the dark matter energy density spectrum.

   hep-ph7 citations
6. 06*

   Towards the assignments for $1^1{D}_2$ and $1^3{D}_2$ meson nonets

   Xue Chao Feng🇨🇳 · Ke Wei Wei🇨🇳 · Jie Wu🇨🇳 · Xue Zhen Zhai🇨🇳 · ShiZhuo Wang🇨🇳

   In this work, we investigate the mass spectrum of $1^1{D}_2$ and $1^3{D}_2$ meson nonets in the framework of the meson mass matrix and Regge phenomenology. The results are compared with the values from different phenomenological models and may be useful for the assignment of the $1^1{D}_2$ and $1^3{D}_2$ meson nonets in the future.

   hep-phActa Phys.Polon.B(2022)·2 citations
7. 07*

   Deviations to $\mu -\tau$ symmetry in a cobimaximal scenario

   Diana C. Rivera-Agudelo🇨🇴 · S.L. Tostado🇨🇴

   Within the different patterns of the neutrino mixing matrix, the cobimaximal mixing remains a plausible possibility for understanding the flavor structure of neutrinos as it is consistent with current experimental data. Such a pattern is related to a concrete form of the mass matrix, displaying a $\mu -\tau$ reflection symmetry, which has motivated many theoretical investigations in recent years. In this paper, we discuss the effects of the Majorana phases over a $\mu -\tau$ symmetric mass matrix obtained from a cobimaximal mixing matrix. We investigate how these phases could be restricted through deviations from the symmetric scenario and the most precise determinations of the mixing parameters. Some of our relations could be tested with future results.

   hep-phNPB(2023)·14 citations
8. 08*

   CP violation in the interference between $\rho (770{)}^0$ and $S$-wave in $B^{\pm }\to {\pi }^{+}{\pi }^{-}{\pi }^{\pm }$ decays and its implication for CP asymmetry in $B^{\pm }\to {\rho }^0{\pi }^{\pm }$

   Hai-Yang Cheng🇹🇼

   The decay amplitude analyses of $B^{\pm }\to {\pi }^{+}{\pi }^{-}{\pi }^{\pm }$ decays in the Dalitz plot performed by LHCb indicate that CP asymmetry for the dominant quasi-two-body decay $B^{\pm }\to \rho (770{)}^0{\pi }^{\pm }$ was found to be consistent with zero in all three approaches for the $S$-wave component and that CP-violation effects related to the interference between the $\rho (770{)}^0$ resonance and the $S$-wave were clearly observed. We show that the nearly vanishing CP violation in $B^{\pm }\to {\rho }^0{\pi }^{\pm }$ is understandable within the framework of QCD factorization. There are two $1/m_b$ power corrections, one from penguin annihilation and the other from hard spectator interactions. They contribute destructively to $A_{CP}(B^{\pm }\to {\rho }^0{\pi }^{\pm })$ to render it compatible with zero, in contrast to the sizable negative CP asymmetry predicted in most of the existing models. We next show that the measured interference pattern between the $\rho$ and $S$-wave contributions in the low $m_{{\pi }^{+}{\pi }^{-}}$ region separated by the sign of value of $\cos \theta$ with $\theta$ being the angle between the two same charged pions measured in the rest frame of the $\rho$ resonance can be explained in terms of the smallness of $A_{CP}(B^{+}\to {\rho }^0{\pi }^{+})$ and the interference between $\rho (770)$ and $\sigma /f_0(500)$. If CP asymmetry in $B^{\pm }\to {\rho }^0{\pi }^{\pm }$ is not negligible as predicted in many existing models, the observed interference pattern will be destroyed. We conclude that the experimental observation of the interference pattern between $P$- and $S$-waves in the low-$m_{{\pi }^{+}{\pi }^{-}}$ region between 0.5 and 1.0 GeV is consistent with a nearly vanishing CP violation in $B^{\pm }\to {\rho }^0{\pi }^{\pm }$.

   hep-phhep-exPRD(2022)·9 citations
9. 09*

   Short-distance constraints on the hadronic light-by-light

   Johan Bijnens🇸🇪 · Nils Hermansson-Truedsson🇨🇭 · Antonio Rodríguez-Sánchez🇮🇹

   The muon anomalous magnetic moment continues to attract interest due to the potential tension between experimental measurement [1,2] and the Standard Model prediction [3]. The hadronic light-by-light contribution to the magnetic moment is one of the two diagrammatic topologies currently saturating the theoretical uncertainty. With the aim of improving precision on the hadronic light-by-light in a data-driven approach founded on dispersion theory [4,5], we derive various short-distance constraints of the underlying correlation function of four electromagnetic currents. Here, we present our previous progress in the purely short-distance regime and current efforts in the so-called Melnikov-Vainshtein limit.

   hep-phEPJ Web Conf.(2022)·2 citations
10. 10*

    $B_c$ meson spectroscopy motivated by general features of pNRQCD

    Raghav Chaturvedi🇮🇳 · Ajay Kumar Rai🇮🇳

    In the present article the mass spectrum, decay constant, weak decay widths, life time and branching fraction ratios and electromagnetic transition widths are calculated for ground and radially excited $B_c$ meson. To calculate the above properties the Schrödinger equation has been solved numerically for the potential. The potential employed consists of relativistic correction in the framework of pNRQCD, added to the Cornell potential. The calculated results are compared with available experimental and theoretical results.

    hep-phEPJA(2022)·17 citations
11. 11*

    Two-body nonleptonic decays of the heavy mesons in the factorization approach

    Shuo-Ying Yu🇨🇳 · Xian-Wei Kang🇨🇳 · V. O. Galkin🇷🇺

    In the framework of the factorization approach we calculate the branching fractions of 100 two-body nonleptonic decay channels in total, including 44 channels of the charm meson decays and 56 channels of the bottom meson decays. For charm meson decays, we test and confirm the previous observation that taking the limit for the number of colors $N\to \infty$ significantly improves theoretical predictions. For bottom meson decays, the penguin contributions are included in addition. As an essential input, we employ the weak decay form factors obtained in the framework of the relativistic quark model based on the quasi-potential approach. These form factors have well been tested by calculating observables in the semileptonic $D$ and $B$ meson decays and confronting obtained results with experimental data. In general, the predictions for the nonleptonic decay branching fractions are acceptable. However, for a quantitative calculation it is necessary to account for a more subtle effects of the final-state interaction.

    hep-phhep-exnucl-thFront.Phys.(Beijing)(2023)·13 citations
12. 12*

    On the contribution of the electromagnetic dipole operator ${\mathcal{O}}_7$ to the ${\bar{B}}_s\to {\mu }^{+}{\mu }^{-}$ decay amplitude

    Thorsten Feldmann🇩🇪 · Nico Gubernari🇩🇪 · Tobias Huber🇩🇪 · Nicolas Seitz🇩🇪

    We construct a factorization theorem that allows to systematically include QCD corrections to the contribution of the electromagnetic dipole operator in the effective weak Hamiltonian to the ${\bar{B}}_s\to {\mu }^{+}{\mu }^{-}$ decay amplitude. We first rederive the known result for the leading-order QED box diagram, which features a double-logarithmic enhancement associated to the different rapidities of the light quark in the ${\bar{B}}_s$ meson and the energetic muons in the final state. We provide a detailed analysis of the cancellation of the related endpoint divergences appearing in individual momentum regions, and show how the rapidity logarithms can be isolated by suitable subtractions applied to the corresponding bare factorization theorem. This allows us to include in a straightforward manner the QCD corrections arising from the renormalization-group running of the hard matching coefficient of the electromagnetic dipole operator in soft-collinear effective theory, the hard-collinear scattering kernel, and the $B_s$-meson distribution amplitude. Focusing on the contribution from the double endpoint logarithms, we derive a compact formula that resums the leading-logarithmic QCD corrections.

    hep-phPRD(2023)·28 citations
13. 13*

    Medium modification of singly heavy baryons in a pion-mean field approach

    Nam-Yong Ghim🇰🇷 · Hyun-Chul Kim🇰🇷 · Ulugbek Yakhshiev🇰🇷 · Ghil-Seok Yang🇰🇷

    We investigate how the masses of singly heavy baryons undergo changes in nuclear matter. The mass spectrum of the singly heavy baryons was successfully described in a pion-mean field approach even with isospin symmetry breaking, based on which we extend the investigation to the medium modification of the singly heavy baryons. Since all dynamical parameters were determined by explaining the mass spectrum of the SU(3) light and singly heavy baryons in free space, we can directly implement the density-dependent functionals for the dynamical parameters, of which the density dependence was already fixed by reproducing the bulk properties of nuclear matter and medium modification of the SU(3) light baryons. We predict and discuss the density dependence of the masses of the singly heavy baryons.

    hep-phnucl-thPRD(2023)·7 citations
14. 14*

    Dark Matter in the Alternative Left Right Model

    Mariana Frank🇨🇦 · Chayan Majumdar🇮🇳 · Poulose Poulose🇮🇳 · Supriya Senapati🇮🇳 · Urjit A. Yajnik🇮🇳

    The Alternative Left-Right Model is an attractive variation of the usual Left-Right Symmetric Model because it avoids flavour-changing neutral currents, thus allowing the additional Higgs bosons in the model to be light. We show here that the model predicts several dark matter candidates naturally, through introduction of an $R$-parity similar to the one in supersymmetry, under which some of the new particles are odd, while all the SM particles are even. Dark matter candidates can be fermionic or bosonic. We present a comprehensive investigation of all possibilities. We analyze and restrict the parameter space where relic density, direct and indirect detection bounds are satisfied, and investigate the possibility of observing fermionic and bosonic dark matter signals at the LHC. Both the bosonic and fermionic candidates provide promising signals, the first in LHC at 300 fb${}^{-1}$, the second at higher luminosity, 3000 fb${}^{-1}$. Signals from bosonic candidates are indicative of the presence of exotic $d^{\prime }$ quarks, while fermionic candidates imply the existence of charged Higgs bosons, all with masses in the TeV region.

    hep-phJHEP(2022)·9 citations
15. 15*

    A Light shed on Lepton Flavor Universality in B decays

    Sonali Patnaik🇮🇳 · Rajeev Singh🇵🇱

    At the back of succeeding measurements of anomalies in semileptonic decays at LHCb and several collider experiments hinting at the possible violation of lepton flavor universality, we undertake a concise review of theoretical foundations of the tree- and loop-level $b$-hadron decays, $b\to cl{\nu }_l$ and $b\to s{l}^{+}{l}^{-}$ along with experimental environments. We revisit the world averages for $R_{D(D^{\ast })}$, $R_{K(K^{\ast })}$, $R_{J/\psi }$, and $R_{{\eta }_c}$, for the semileptonic transitions and provide results within the framework of the relativistic independent quark model in addition to the results from model-independent studies. If the ongoing evaluation of the data of LHC Run 2 confirms the measurements of Run 1, then the statistical significance of the effect in each decay channel is likely to reach 5~$\sigma$. A confirmation of these measurements would soon turn out to be the first remarkable observation of physics beyond the Standard Model providing a wider outlook on the understanding of New Physics.

    hep-phUniverse(2023)·9 citations
16. 16*

    Semileptonic decays of doubly charmed baryons with bag model

    Chao-Qiang Geng🇨🇳 · Chia-Wei Liu🇨🇳 · Aowen Zhou🇨🇳 · Xiao Yu🇨🇳

    We study the semileptonic decays of $B_{cc}$ $\to$ $B_c{\ell }^{+}{\nu }_{\ell }$ with the bag model, where $\ell$ = $(e,\mu )$, $B_{cc}$ = $({\Xi }_{cc}^{++}$, ${\Xi }_{cc}^{+}$, ${\Omega }_{cc}^{+}$), and $B_c$ are the singly charmed baryons with $J^P=1/2^{+}$. We obtain the decay widths of $\Gamma ({\Xi }_{cc}^{++}\to {\Xi }_c^{+}{e}^{+}{\nu }_e,{\Xi }_c^{\prime +}{e}^{+}{\nu }_e,{\Lambda }_c^{+}{e}^{+}{\nu }_e,{\Omega }_c^{+}{e}^{+}{\nu }_e)=(5.1\pm 0.1,11\pm 1,0.34\pm 0.06,0.76\pm 0.06)\times 10^{-14}$~GeV, $\Gamma ({\Xi }_{cc}^{+}\to {\Xi }_c^0{e}^{+}{\nu }_e,{\Xi }_c^{\prime 0}{e}^{+}{\nu }_e,{\Sigma }_c^0{e}^{+}{\nu }_e)=(5.1\pm 0.6,11\pm 1,1.5\pm 0.1)\times 10^{-14}$~GeV, and $\Gamma ({\Omega }_{cc}^{+}\to {\Omega }_c^0{e}^{+}{\nu }_e,{\Xi }_c^0{e}^{+}{\nu }_e,{\Xi }_c^{\prime 0}{e}^{+}{\nu }_e)=(22\pm 2,0.32\pm 0.04,0.77\pm 0.06)\times 10^{-14}$~GeV. We also get that $\Gamma$($B_{cc}$ $\to$ $B_c{\mu }^{+}{\nu }_{\mu }$)/$\Gamma$($B_{cc}$ $\to$ $B_c{e}^{+}{\nu }_e$) = $0.97\sim 1.00$. In addition, we discuss the $SU(3)$ flavor breaking effects, classified into three aspects: phase space differences, spectator quarks, and overlappings of the transited quarks. In particular, we show that the breaking effects are dominated by the phase space differences, which can be as large as 25\%. Explicitly, we find that $\Gamma ({\Xi }_{cc}^{++}\to {\Lambda }_c^{+}{e}^{+}{\nu }_e)V_{cs}^2/\Gamma ({\Xi }_{cc}^{++}\to {\Xi }_c^{+}{e}^{+}{\nu }_e)V_{cd}^2=1.24$, which is expected as $1$ under the exact $SU(3)$ flavor symmetry.

    hep-phhep-exPRD(2023)·6 citations
17. 17*

    Connecting $b\to s\ell \ell$ with $b\to s\nu \bar{\nu }$ and $s\to d\nu \bar{\nu }$

    Martín Novoa-Brunet🇮🇹

    We discuss the consequences of deviations from the Standard Model observed in $b\to s{\mu }^{+}{\mu }^{-}$ transitions for flavour-changing neutral-current processes involving down-type quarks and neutrinos. We work within an effective field theory approach respecting the SM gauge symmetry, including right-handed currents, a flavour structure based on approximate U(2) symmetry, and assuming only SM-like light neutrinos. We discuss correlations among $B\to h_s\nu \bar{\nu }$ ($h_s=K,K^{\ast },X_s$), $K^{+}\to {\pi }^{+}\nu \bar{\nu }$ and $K_L\to {\pi }^0\nu \bar{\nu }$ branching ratios in the case of linear Minimal Flavour Violation and in a more general framework.

    hep-ph0 citations
18. 18*

    Diffractive di-hadron production at NLO within the shockwave formalism

    Michael Fucilla🇮🇹 · Andrey V. Grabovsky🇷🇺 · Lech Szymanowski🇵🇱 · Emilie Li🇫🇷 · Samuel Wallon🇫🇷

    We compute the next-leading-order cross-sections for diffractive electro- or photoproduction of a pair of hadrons with large $p_T$, out of a nucleus or a nucleon. A hybrid factorization is used, mixing collinear and small-$x$ factorizations, more precisely shockwave formalism. We demonstrate the cancellation of divergences and extract the finite parts of the differential cross-section in general kinematics.

    hep-phActa Phys.Polon.Supp.(2023)·2 citations
19. 19*

    One-loop Matching for the Seesaw Model

    Di Zhang🇨🇳 · Shun Zhou🇨🇳

    In this talk, we present the results of the complete one-loop matching of the seesaw model onto its low-energy effective theory by integrating out three right-handed neutrinos at the one-loop level. We find that there are 31 independent dimension-6 (dim-6) operators (barring flavor structures and Hermitian conjugates) in the Warsaw basis, and the standard-model couplings and the Wilson coefficient of the Weinberg operator acquire threshold corrections at the one-loop level. The complete Lagrangian up to dim-6 at the one-loop level is derived, which is indispensable for consistent explorations of the impact of heavy right-handed neutrinos at low energies.

    hep-phhep-exPoS(2022)·0 citations
20. 20*

    Neutrino mass and leptogenesis in a hybrid seesaw model with a spontaneously broken CP

    Rohan Pramanick🇮🇳 · Tirtha Sankar Ray🇮🇳 · Avirup Shaw🇮🇳

    We introduce a novel hybrid framework combining type I and type II seesaw models for neutrino mass where a complex vacuum expectation value of a singlet scalar field breaks CP spontaneously. Using pragmatic organizing symmetries we demonstrate that such a model can simultaneously explain the neutrino oscillation data and generate observed baryon asymmetry through leptogenesis. Interestingly, natural choice of parameters leads to a mixed leptogenesis scenario driven by nearly degenerate scalar triplet and right handed singlet neutrino fields for which we present a detailed quantitative analysis.

    hep-phJHEP(2023)·9 citations
21. 21*

    Stability of homogeneous chiral phases against inhomogeneous perturbations in 2+1 dimensions

    Marc Winstel🇩🇪 · Laurin Pannullo🇩🇪

    In this work, inhomogeneous chiral phases are studied in a variety of Four-Fermion and Yukawa models in $2+1$ dimensions at zero and non-zero temperature and chemical potentials. Employing the mean-field approximation, we do not find indications for an inhomogeneous phase in any of the studied models. We show that the homogeneous phases are stable against inhomogeneous perturbations. At zero temperature, full analytic results are presented.

    hep-phcond-mat.str-elhep-latPoS(2023)·16 citations
22. 22*

    Axion-like ALPs

    Fernando Arias-Aragón🇫🇷 · Jérémie Quevillon🇫🇷 · Christopher Smith🇫🇷

    The Effective Field Theory (EFT) Lagrangian for a generic axion-like particle (ALP) has many free parameters, and leaves quite some freedom for the expected phenomenology. In this work, we set up more constrained EFTs by enforcing true axion-like properties for the ALP. Indeed, though the Peccei-Quinn symmetry of the QCD axion is anomalous, it is so in specific ways, and this shows up as consistency conditions between the gauge boson and fermion couplings. We propose to enforce such conditions, as inspired from the DFSZ and KSVZ scenarios, on the generic ALP EFTs. These truly axion-like ALP EFTs are then particularly well-suited as benchmark scenarios, to be used in the search for ALPs both at colliders and at low-energy experiments.

    hep-phJHEP(2023)·33 citations
23. 23*

    Probing Poincaré Violation

    Rick S. Gupta🇮🇳 · Joerg Jaeckel🇩🇪 · Michael Spannowsky🇬🇧

    Time and space translation invariance, giving rise to energy and momentum conservation, are not only amongst the most fundamental but also the most generally accepted symmetry assumptions in physics. It is nevertheless prudent to put such assumptions to experimental and observational tests. In this note, we take the first step in this direction, specifying a simple periodic time dependence that violates time translation invariance in QED, and setting phenomenological constraints on it. In addition to observational and experimental constraints on time varying couplings, we focus on probes of violation of energy conservation such as spontaneous production of photon and electron pairs and the $e\to e\gamma$ process. We discuss similarities and differences to the discussion of time varying fundamental constants and to the case of a light bosonic dark matter field that usually also causes oscillating effects.

    hep-phhep-exhep-thJHEP(2023)·8 citations
24. 24*

    Factorization for quasi-TMD distributions of sub-leading power

    Simone Rodini🇫🇷 · Alexey Vladimirov🇪🇸

    The quasi-transverse-momentum dependent (qTMD) distributions are equal-time correlators that can be computed within the lattice QCD approach. In the regime of large hadron's momentum, qTMD distributions are expressed in terms of standard TMD distributions via the factorization theorem. We derive the corresponding factorization theorem at the next-leading power (NLP), and, for the first time, we present the factorized expressions for a large class of qTMD distributions of sub-leading power. The NLP expression contains TMD distributions of twist-two, twist-three, and a new lattice-specific nonperturbative function. We point out that some of the qTMD distributions considered in this work can be employed to extract the Collins-Soper kernel using the standard techniques of different-momenta-ratio. We provide NLO expressions for all the elements of the factorization theorem. Also, for the first time, we explicitly demonstrate the restoration of boost invariance in NLP TMD factorization.

    hep-phhep-lathep-thJHEP(2023)·31 citations
25. 25*

    SuperRad: Modeling the black hole superradiance gravitational waveform

    Nils Siemonsen🇨🇦 · Taillte May🇨🇦 · William E. East🇨🇦

    Gravitational signatures of black hole superradiance are a unique probe of ultralight particles that are weakly-coupled to ordinary matter. The existence of an ultralight boson would lead spinning black holes with size comparable to the Compton wavelength of the boson to become superradiantly unstable to forming an oscillating cloud, spinning down the black hole, and radiating gravitational waves in the process. However, maximizing the chance of observing such signals or, in their absence, placing the strongest constraints on the existence of such particles, requires accurate theoretical predictions. In this work, we introduce a new gravitational waveform model, SuperRad, that models the dynamics, oscillation frequency, and gravitational wave signals of these clouds by combining numerical results in the relativistic regime with fits calibrated to analytical estimates, covering the entire parameter space of ultralight scalar and vector clouds with the lowest two azimuthal numbers ($m=1$ and $2$). We present new calculations of the gravitational wave frequency evolution as the boson cloud dissipates, including using fully general-relativistic methods to quantify the error in more approximate treatments. Finally, as a first application, we assess the viability of conducting follow-up gravitational wave searches for ultralight vector clouds around massive black hole binary merger remnants. We show that LISA may be able to probe vector masses in the range from $1\times 10^{-16}$ eV to $6\times 10^{-16}$ eV using follow-up gravitational wave searches.

    ↳ gr-qcastro-ph.HEhep-phPRD(2023)·77 citations
26. 26*

    Spectroscopy of chimera baryons in a $Sp(4)$ lattice gauge theory

    Ho Hsiao🇹🇼 · Ed Bennett🇬🇧 · Deog Ki Hong🇰🇷 · Jong-Wan Lee🇰🇷 · C.-J. David Lin🇹🇼 · Biagio Lucini🇬🇧 · Maurizio Piai🇬🇧 · Davide Vadacchino🇬🇧

    Chimera baryons are an important element of strongly coupled theories that provide a microscopic origin for UV complete composite Higgs models (CHMs), since they play the role of top partners in top partial compositeness. In a particular interesting realisation of CHMs based upon an underlying $Sp(4)$ gauge theory, such exotic objects are composed of two fermion constituents transforming on the fundamental, and one on the 2-index antisymmetric representations. We perform lattice computations of the chimera baryon spectrum in the quenched approximation. We present preliminary results for the masses of various chimera baryons with different quantum numbers, including the one interpreted as the top partner. We test the technology needed for future calculations with dynamical fermions.

    ↳ hep-lathep-ph16 citations
27. 27*

    Deciphering the ~18 TeV photons from GRB 221009A

    Sarira Sahu🇲🇽 · B. Medina-Carrillo🇲🇽 · G. Sánchez-Colón🇲🇽 · Subhash Rajpoot🇺🇸

    On 9 October, 2022, an extremely powerful gamma-ray burst, GRB 221009A, was detected by several instruments. Despite being obstructed by the Milky Way galaxy, its afterglow outburst outshone all other GRBs seen before. LHAASO detected several thousands very high energy photons extending up to 18 TeV. Detection of such energetic photons are unexpected due to the large opacity of the Universe. It is possible that in the afterglow epoch the intrinsic very high energy photon flux from the source might have increased manifolds, which could compensate the attenuation by pair-production with the extragalactic background light. We propose such a scenario and show that very high energy photons can be observed on the Earth from the interaction of very high energy protons with the seed synchrotron photons in the external forward shock region of the GRB jet.

    ↳ astro-ph.HEhep-phApJL(2023)·21 citations
28. 28*

    Big bang nucleosynthesis and early dark energy in light of the EMPRESS $Y_p$ results and the $H_0$ tension

    Tomo Takahashi🇯🇵 · Sora Yamashita🇯🇵

    Recent measurement of the primordial ${}^4$He abundance $Y_p$ from EMPRESS suggests a cosmological scenario with the effective number of neutrino species deviated from the standard value and non-zero lepton asymmetry. We argue that the extension of the standard cosmological model would be more demanded when the Hubble tension is taken into account, in which derived baryon density could be somewhat higher than the standard $\Lambda$CDM framework. We also discuss the issue by assuming early dark energy whose energy density can have a sizable fraction at the epoch of big bang nucleosynthesis. We show that the existence of early dark energy can reduce some tension implied by the EMPRESS $Y_p$ results.

    ↳ astro-ph.COhep-phPRD(2023)·13 citations
29. 29*

    Pseudoscalar transition form factors and the hadronic light-by-light contribution to the muon $g-2$

    Antoine Gérardin🇫🇷 · Jana N. Guenther🇩🇪 · Lukas Varnhorst🇩🇪 · Willem E. A. Verplanke🇫🇷

    We report on our progress toward the computation of the ${\pi }^0$, $\eta$ and ${\eta }^{\prime }$ transition form factors using staggered quarks on $N_f=2+1+1$ gauge ensembles generated by the Budapest-Marseille-Wuppertal collaboration. These form factors are essential ingredients to evaluate the pseudoscalar-pole contributions to the hadronic light-by-light scattering in the muon $g-2$. Preliminary results for the pseudoscalar-pole contributions are presented, at finite lattice spacing, for all three light mesons.

    ↳ hep-lathep-exhep-phPoS(2023)·5 citations
30. 30*

    Light-amplified Landau-Zener conductivity in gapped graphene monolayers: a simulacrum of photo-catalyzed vacuum instability

    Selym Villalba-Chávez🇩🇪 · Oliver Mathiak🇩🇪 · Reinhold Egger🇩🇪 · Carsten Müller🇩🇪

    Interband transitions of electrons in a gapped graphene monolayer are highly stimulated near the Fermi surface when a high-frequency electric wave of weak intensity and a strong constant electric field are superposed in the plane of the flake. We consider this phenomenon equivalent to the Franz-Keldysh effect, paying particular attention to the regime where the photon energy linked to the fast-oscillating field is just below the graphene gap, so that the quantum transitions still occur through tunneling effects while being facilitated by the one-photon absorption channel. In the considered parameter regime the photo-catalyzed current linked to the described setup is shown to exceed the one driven by the strong field solely by several orders of magnitude. Conditions to relieve the impact of the field's finite extension are discussed, and a formula for the residual current density is derived. The robustness of our assessment supports the viability of detecting this phenomenon in graphene, thus providing a simulation of the dynamically-assisted Schwinger mechanism in QED.

    ↳ cond-mat.mes-hallhep-phquant-phPRD(2023)·6 citations
31. 31*

    Taming Calabi-Yau Feynman integrals: The four-loop equal-mass banana integral

    Sebastian Pögel🇩🇪 · Xing Wang🇩🇪 · Stefan Weinzierl🇩🇪

    Certain Feynman integrals are associated to Calabi-Yau geometries. We demonstrate how these integrals can be computed with the method of differential equations. The four-loop equal-mass banana integral is the simplest Feynman integral whose geometry is a non-trivial Calabi-Yau manifold. We show that its differential equation can be cast into an $\epsilon$-factorised form. This allows us to obtain the solution to any desired order in the dimensional regularisation parameter $\epsilon$. The method generalises to other Calabi-Yau Feynman integrals. Our calculation also shows that the four-loop banana integral is only minimally more complicated than the corresponding Feynman integrals at two or three loops.

    ↳ hep-thhep-phmath-phmath.MPPRL(2023)·77 citations
32. 32*

    Non-singlet quark helicity PDFs of the nucleon from pseudo-distributions

    Robert G. Edwards🇺🇸 · Colin Egerer🇺🇸 · Joseph Karpie🇺🇸 · Nikhil Karthik🇺🇸 · Christopher J. Monahan🇺🇸 · Wayne Morris🇺🇸 · Kostas Orginos🇺🇸 · Anatoly Radyushkin🇺🇸 · David Richards🇺🇸 · Eloy Romero🇺🇸 · Raza Sabbir Sufian🇺🇸 · Savvas Zafeiropoulos🇫🇷

    The non-singlet helicity quark parton distribution functions (PDFs) of the nucleon are determined from lattice QCD, by jointly leveraging pseudo-distributions and the distillation spatial smearing paradigm. A Lorentz decomposition of appropriately isolated space-like matrix elements reveals pseudo-distributions that contain information on the leading-twist helicity PDFs, as well as an invariant amplitude that induces an additional $z^2$ contamination of the leading-twist signal. An analysis of the short-distance behavior of the space-like matrix elements using matching coefficients computed to next-to-leading order (NLO) exposes the desired PDF up to this additional $z^2$ contamination. Due to the non-conservation of the axial current, we elect to isolate the helicity PDFs normalized by the nucleon axial charge at the same scale ${\mu }^2$. The leading-twist helicity PDFs as well as several sources of systematic error, including higher-twist effects, discretization errors, and the aforementioned $z^2$ contaminating amplitude are jointly determined by characterizing the computed pseudo-distribution in a basis of Jacobi polynomials. The Akaike Information Criterion is exploited to effectively average over distinct model parameterizations and cuts on the pseudo-distribution. Encouraging agreement is observed with recent global analyses of each non-singlet quark helicity PDF, notably a rather small non-singlet anti-quark helicity PDF for all quark momentum fractions.

    ↳ hep-lathep-phJHEP(2023)·24 citations
33. 33*

    Hidden Hearts of Neutrino Active Galaxies

    Kohta Murase🇺🇸

    Recent multimessenger studies have provided evidence for high-energy neutrino sources that are opaque to GeV-TeV gamma rays. We present model-independent studies on the connection between neutrinos and gamma rays in the active galaxy NGC 1068, and find that the neutrinos most likely come from regions within about 30-100 Schwarzschild radii. This is especially the case if neutrinos are produced via the photomeson production process, although the constraints could be alleviated if hadronuclear interactions are dominant. We consider the most favorable neutrino production regions, and discuss coronae, jets, winds, and their interactions with dense material. The results strengthen the importance of understanding dissipation mechanisms near the coronal region and the outflow base. There could be a connection between active galactic nuclei with near-Eddington accretion and tidal disruptions events, in that neutrinos are produced in the obscured vicinity of supermassive black holes.

    ↳ astro-ph.HEastro-ph.GAhep-phApJ(2022)·135 citations
34. 34*

    Self-Binding Energies in AdS

    Stefano Andriolo🇮🇱 · Marco Michel🇮🇱 · Eran Palti🇮🇱

    The Positive Binding Conjecture is a proposed formulation of the Weak Gravity Conjecture appropriate to Anti de-Sitter (AdS) space. It proposes that in a consistent gravitational theory, with a $U(1)$ gauge symmetry, there must exist a charged particle with non-negative self-binding energy. In order to formulate this as a constraint on a given effective theory, we calculate the self-binding energy for a charged particle in AdS${}_4$ and AdS${}_5$. In particular, we allow it to couple to an additional scalar field of arbitrary mass. Unlike the flat-space case, even when the scalar field is massive it contributes significantly to the binding energy, and therefore is an essential component of the conjecture. In AdS${}_5$, we give analytic expressions for the self-binding energy for the cases when the scalar field is massless and when it saturates the Breitenlohner-Freedman (BF) bound, and in AdS${}_4$ when it is massless. We show that the massless case reproduces the flat-space expressions in the large AdS radius limit, and that both analytic cases lead to vanishing total self-binding energy for BPS particles in example supersymmetric models. For other masses of the scalar we give numerical expressions for its contribution to the self-binding energy.

    ↳ hep-thhep-phJHEP(2023)·11 citations
35. 35*

    The Hubble Tension and Early Dark Energy

    Marc Kamionkowski🇺🇸 · Adam G. Riess🇺🇸

    Over the past decade, the disparity between the value of the cosmic expansion rate directly determined from measurements of distance and redshift or instead from the standard $\Lambda$CDM cosmological model calibrated by measurements from the early Universe, has grown to a level of significance requiring a solution. Proposed systematic errors are not supported by the breadth of available data (and "unknown errors" untestable by lack of definition). Simple theoretical explanations for this "Hubble tension" that are consistent with the majority of the data have been surprisingly hard to come by, but in recent years, attention has focused increasingly on models that alter the early or pre-recombination physics of $\Lambda$CDM as the most feasible. Here, we describe the nature of this tension, emphasizing recent developments on the observational side. We then explain why early-Universe solutions are currently favored and the constraints that any such model must satisfy. We discuss one workable example, early dark energy, and describe how it can be tested with future measurements. Given an assortment of more extended recent reviews on specific aspects of the problem, the discussion is intended to be fairly general and understandable to a broad audience.

    ↳ astro-ph.COgr-qchep-phAnn.Rev.Nucl.Part.Sci.(2023)·504 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.