Tue·Oct 17, 2023Tuesday·October 17, 2023

1. 01*

   Leptogenesis in a Left-Right Symmetric Model with double seesaw

   Utkarsh Patel🇮🇳 · Pratik Adarsh🇮🇳 · Sudhanwa Patra🇮🇳 · Purushottam Sahu🇮🇳

   We explore the connection between low-scale CP-violating Dirac phase~$(\delta )$ and high-scale leptogenesis in a Left-Right Symmetric Model (LRSM) with scalar bidoublet and doublets. The fermion sector of the model is extended with one sterile neutrino~$(S_L)$ per generation to implement a double seesaw mechanism in the neutral fermion mass matrix. The double seesaw is performed via the implementation of type-I seesaw twice. The first seesaw facilitates the generation of Majorana mass term for heavy right-handed (RH) neutrinos~$(N_R)$, and the light neutrino mass becomes linearly dependent on $S_L$ mass in the second. In our framework, we have taken charge conjugation ($C$) as the discrete left-right (LR) symmetry. This choice assists in deriving the Dirac neutrino mass matrix ($M_D$) in terms of the light and heavy RH neutrino masses and light neutrino mixing matrix $U_{PMNS}$ (containing $\delta$). We illustrate the viability of unflavored thermal leptogenesis via the decay of RH neutrinos by using the obtained $M_D$ with the masses of RH neutrinos as input parameters. A complete analysis of the Boltzmann equations describing the asymmetry evolution is performed in the unflavored regime, and it is shown that with or without Majorana phases, the CP-violating Dirac phase is sufficient to produce the required asymmetry in the leptonic sector within this framework for a given choice of input parameters. Finally, we comment on the possibility of constraining our model with the current and near-future oscillation experiments, which are aimed at refining the value of $\delta$.

   hep-phhep-thJHEP(2024)·13 citations
2. 02*

   Viability of Boosted Light Dark Matter in a Two-Component Scenario

   Arindam Basu🇮🇳 · Amit Chakraborty🇮🇳 · Nilanjana Kumar🇮🇳 · Soumya Sadhukhan🇮🇳

   We study the boosted dark matter (BDM) scenario in a two-component model. We consider a neutrinophilic two-Higgs doublet model ($\nu$2HDM), which consists of one extra Higgs doublet and a light right-handed neutrino. This model is extended with a light ($\sim 10$~MeV) singlet scalar DM ${\varphi }_3$, which is stabilized under an extra dark $Z_2^{\mathrm{DM}}$ symmetry and can only effectively annihilate through the CP even scalar $H$. Although oblique parameters put tight constraints on the model, introduction of vectorlike leptons (VLL) can potentially salvage the issue. The vectorlike doublet $N$ and singlet $\chi$ are also stabilized through dark $Z_2^{\mathrm{DM}}$ symmetry. The lightest vectorlike mass eigenstate (${\chi }_1\sim 100$~GeV) is the 2nd DM component of the model. The fermion DM is restricted in a narrow mass region while a somewhat broader mass region is allowed for the scalar DM. However, when two DM sectors are coupled, the annihilation channel ${\chi }_1{\chi }_1\to {\varphi }_3{\varphi }_3$ opens up. As a result, the fermionic relic density decreases, and paves way for broader fermionic DM mass region with under-abundant relic: a region of $[30-65]$ GeV compared to a narrower $[40-50]$ GeV window for the single component case. On the other hand, the light DM ${\varphi }_3$ acquires significant boost from the annihilation of ${\chi }_1$, causing a dilution in the resonant annihilation of ${\varphi }_3$. This in turn increases the scalar DM relic, allowing for a smaller mass region compared to the individual case. The exact and underabundant relic is achievable in a significant parameter space of the two-component model where the total DM relic is mainly dominated by the fermionic DM contribution. The scalar DM is found to be sub-dominant or equally dominant ($\sim 30\%-80\%$ of total DM) with significant boost which can be detected in experiments.

   hep-phhep-thPRD(2025)·5 citations
3. 03*

   Four-jet event shapes in hadronic Higgs decays

   Aude Gehrmann-De Ridder🇨🇭 · Christian T Preuss🇩🇪 · Ciaran Williams🇺🇸

   We present next-to-leading order perturbative QCD predictions for four-jet-like event-shape observables in hadronic Higgs decays. To this end, we take into account two Higgs-decay categories: involving either the Yukawa-induced decay to a $b\bar{b}$ pair or the loop-induced decay to two gluons via an effective Higgs-gluon-gluon coupling. We present results for distributions related to the event-shape variables thrust minor, light-hemisphere mass, narrow jet broadening, $D$-parameter, and Durham four-to-three-jet transition variable. For each of these observables we study the impact of higher-order corrections and compare their size and shape in the two Higgs-decay categories. We find large NLO corrections with a visible shape difference between the two decay modes, leading to a significant shift of the peak in distributions related to the $H\to gg$ decay mode.

   hep-phJHEP(2024)·18 citations
4. 04*

   Parallel scattering, saturation, and generalized Abramovskii-Gribov-Kancheli (AGK) theorem in the EPOS4 framework, with applications for heavy-ion collisions at $\sqrt{s_{NN}}$ of 5.02 TeV and 200 GeV

   K. Werner🇫🇷

   Ultrarelativistic heavy-ion collisions will first realize many nucleon-nucleon scatterings, happening instantaneously and therefore necessarily in parallel, due to the short collision time. An appropriate quantum mechanical tool to treat that problem is S-matrix theory, and it has been known for a long time how to derive a simple geometric probabilistic picture, still widely used, and here the Abramovskii-Gribov-Kancheli (AGK) theorem plays a crucial role. All this is done in a scenario where energy conservation is not taken care of, but this is needed, in particular for Monte Carlo simulations. When introducing energy-momentum sharing properly, the AGK theorem does not apply anymore, nor do simple geometric concepts such as binary scaling. I will discuss this (very serious) problem, and how it can be solved, in the EPOS4 framework. When connecting the multiple Pomeron approach (for parallel scatterings) and perturbative QCD, one is actually forced to implement in a very particular way saturation scales, in order to get an approach free of contradictions. One recovers a generalized AGK theorem (gAGK), valid at large $p_t$ (larger than the relevant saturation scales). I discuss how gAGK is related to factorization (in proton-proton scatterings) and binary scaling (in heavy-ion collisions). I will show some applications, using this new approach as an initial condition for hydrodynamical evolutions, for heavy-ion collisions at $\sqrt{s_{NN}}$ of 5.02 TeV and 200 GeV, to get some idea about the energy dependence.

   hep-phnucl-thPRC(2024)·43 citations
5. 05*

   Mass Spectrum of Non-Charmed and Charmed Meson States in Extended Linear-Sigma Model

   Azar I. Ahmadov (Baku, Inst. Phys.)🇦🇿 · Azza A. Alshehri (University of Hafr Al Batin, KSA)🇸🇦 · Abdel Nasser Tawfik (Future U. in Egypt and Egyptian Ctr. Theor. Phys., Cairo)🇦🇿

   The mass spectrum of different meson particles is generated using an effective Lagrangian of the extended linear-sigma model (eLSM) for scalar and pseudoscalar meson fields and quark flavors, up, down, strange, and charm. Analytical formulas for the masses of scalar, pseudoscalar, vector, and axialvector meson states are derived assuming global chiral symmetry. The various eLSM parameters are analytically deduced and numerically computed. This enables accurate estimations of the masses of sixteen non-charmed and thirteen charmed meson states at vanishing temperature. The comparison of these results to recent compilation of the particle data group (PDG) allows to draw the conclusion that the masses of sixteen non-charmed and thirteen charmed meson states calculated in the eLSM are in good agreement with the PDG. This shows that the eLSM, with its configurations and parameters, is an effective theoretical framework for determining the mass spectra of various non-charmed and charmed meson states, particularly at vanishing temperature.

   hep-phnucl-thParticles(2024)·3 citations
6. 06*

   Effects of new physics on the Standard Model parameters and vice versa

   Mario W. Barela🇧🇷 · V. Pleitez🇧🇷

   This note discusses the matter of probing Beyond the Standard Model physics and how, to succeed in this quest, the interpretations of the Standard Model regarding observed phenomena must be utilized with caution. We give several specific examples of why this is necessary and assess general scenarios in which it is specially important. In particular, we call attention to the fact that once the Standard Model (SM) is finally replaced, the parameters of the new theory which embed those of the SM must be rederived directly from data instead of inherited through their expected relations with those of the SM.

   hep-ph1 citation
7. 07*

   Proving Rho Meson be a Dynamical Gauge Boson of Hidden Local Symmetry

   Koichi Yamawaki🇯🇵

   The rho meson has long been successfully identified with a dynamical gauge boson of the Hidden Local Symmetry (HLS) $H_{\mathrm{local}}$ in the nonlinear sigma model $G/H$ gauge equivalent to the model having the symmetry $G_{\mathrm{global}}\times H_{\mathrm{local}}$, with $G=[SU(2{)}_L\times SU(2{)}_R]\simeq O(4),H=SU(2{)}_V\simeq O(3)$, however under a hitherto unproven assumption that its kinetic term is dynamically generated, together with an ad hoc choice of the auxiliary field parameter "$a=2$". We prove this assumption, thereby solving the long-standing mystery: The rho meson kinetic term is generated simply by the large $N$ limit of the Grassmannian model $G/H=O(N)/[O(N-3)\times O(3)]$ gauge equivalent to $O(N{)}_{\mathrm{global}}\times [O(N-3)\times O(3){]}_{\mathrm{local}}$, extrapolated to $N=4$, $O(4{)}_{\mathrm{global}}\times O(3{)}_{\mathrm{local}}$, with all the phenomenologically successful "$a=2$ results" i.e., $\rho$-universality, KSRF relation and the Vector Meson Dominance, realized {\it independently of the parameter "$a$".} This in turn establishes validity of the large $N$ dynamics at quantitative level directly by the experiments. The relevant cutoff reads $\Lambda \simeq 4\pi F_{\pi }$ for $N=4$, which is regarded as a matching scale of the HLS as a "magnetic dual" to QCD. Skyrmion is stabilized by such a dynamically generated rho meson without recourse to the underlying QCD, further signal of the duality. The unbroken phase with massless rho meson may be realized as a novel chiral restored hadronic phase in hot/dense QCD.

   hep-phSymmetry(2023)·6 citations
8. 08*

   The role of pomeron states in the Glueball Resonance Gas

   Enrico Trotti🇵🇱 · Shahriyar Jafarzade🇵🇱

   In this note, we present our recent analyses of the thermodynamic properties of the glueball resonance gas. We observe that the dominant contribution to the thermodynamic quantities, such as pressure, trace anomaly, and entropy, is coming from the free glueball gas with the states of positive charge conjugation (i.e., pomeron). A comparison of pomeron states obtained from LQCD and functional methods within the glueball resonance gas model is also presented.

   hep-phNuovo Cim.C(2024)·0 citations
9. 09*

   Decays of the tensor glueball in a chiral approach

   Arthur Vereijken🇵🇱

   Glueballs remain an experimentally undiscovered prediction of QCD. Lattice QCD predicts a spectrum of glueballs, with the tensor $(J^{PC}=2^{++})$ glueball being the second lightest, behind the scalar glueball. From an effective hadronic model based on spontaneous and explicit chiral symmetry breaking, we compute decay ratios of the tensor glueball into various meson decay channels. We find the tensor glueball to primarily decay into 2 vector mesons, dominated by $\rho \rho$ and $K^{\ast }{K}^{\ast }$. These results are compared to experimental data of decay rates of spin 2 mesons. Based on this comparison we make statements on the eligibility of these mesons as potential tensor glueball candidates.

   hep-phEPJ Web Conf.(2024)·0 citations
10. 10*

    Clockwork Neutrinogenesis: Baryogenesis from theory space

    Suvam Maharana🇮🇳 · Tripurari Srivastava🇮🇳

    We propose a minimal clockwork model to illustrate the possibility of baryogenesis via leptogenesis in a theory space setting. The standard lepton sector is augmented with three copies of a clockwork lattice made of SM neutral fermions. The two boundaries of these one-dimensional lattices are endowed with couplings to the SM leptons and three dark sector fermions, respectively. Small neutrino masses and a resonance enhanced Dirac leptogenesis are naturally obtained for anarchic textures of the Yukawa matrices, with $\sim \mathcal{O}(1)$ elements, provided the heavy clockwork fermions have masses $\gtrsim \mathcal{O}(10\text{mbox}TeV)$

    hep-phhep-thPLB(2025)·1 citation
11. 11*

    One loop reduced QED for massive fermions within an innovative formalism

    Victor Miguel Banda Guzmán🇲🇽 · Adnan Bashir🇲🇽 · Luis Albino🇲🇽 · Dania Rodríguez-Tzintzun🇲🇽

    We carry out a detailed study of the three-point fermion-photon interaction vertex at one loop order for massive fermions in reduced quantum electrodynamics. This calculation is carried out in arbitrary covariant gauges and space-time dimensions within a recently proposed innovative approach based upon an efficient combination of the first and second order formalisms of quantum electrodynamics. This procedure provides a natural decomposition of the vertex into its components which are longitudinal and transverse to the photon momentum. It also separates the spin and scalar degrees of freedom of a fermion interacting electromagnetically, allowing us to readily establish the gauge-independence of the Pauli form factor and compute it in an expeditious manner. All incoming and outgoing momenta are taken off-shell at the outset. However, we present results for cases of particular kinematic interest whenever required. For the sake of completeness, we also provide expressions for the massive fermion self energy and photon vacuum polarization, verifying known expressions for massless reduced quantum electrodynamics and computing the renormalization constants ${\mathcal{Z}}_1$, ${\mathcal{Z}}_2$ and ${\mathcal{Z}}_3$. As we provide general expressions for the computed Green functions, we readily reproduce and confirm the results for standard quantum electrodynamics. Comparing the two cases, we infer that the Pauli form factor for reduced quantum electrodynamics is $8/3$ times that for the standard QED in four dimensions, implying a higher Landé $g$-factor. We expect our perturbative calculation of the fermion-photon vertex to serve as a guide for any non-perturbative construction of this Green function, invariably required in the Schwinger-Dyson equation studies of the subject.

    hep-phcond-mat.mtrl-scihep-thnucl-thPRD(2023)·3 citations
12. 12*

    Hadron-quark transition and chiral symmetry restoration at high density

    Hiroaki Kouno🇯🇵 · Kouji Kashiwa🇯🇵

    A simple phenomenological hybrid hadron-quark model with effective volume effects of baryons and chiral dynamics is investigated. The hybrid EoS naturally connects the low density baryonic matter with the high density quark matter. In the intermediate region, the phase which can not be regarded as pure hadron matter or pure quark matter appears. In this model, there is a possibility that the abrupt first -order like transition to pure quark matter induces the strong chiral symmetry restoration and the speed of sound has a large peak at considerable large density.

    hep-phhep-latnucl-thPRD(2024)·8 citations
13. 13*

    The $T_{c\bar{s}}(2900)$ as a threshold effect from the interaction of the $D^{\ast }{K}^{\ast }$, $D_s^{\ast }\rho$ channels

    R. Molina🇪🇸 · E. Oset🇪🇸

    We investigate the $D^{\ast }{K}^{\ast }$ and $D_s^{\ast }\rho$ interaction in coupled channels within the hidden gauge formalism. A structure is developed around their thresholds, short of producing a bound state, which leads to a peak in the $D_s^{+}{\pi }^{-}$ mass distribution in the $B^0\to {\bar{D}}^0{D}_s^{+}{\pi }^{-}$ decay compatible with the experimental data. We conclude that the interaction between the $D^{\ast }{K}^{\ast }$ and $D_s^{\ast }\rho$ is essential to produce the cusp structure that we associate to the recently seen $T_{c\bar{s}}(2900)$, and that its experimental width is mainly due to the decay width of the $\rho$ meson. The peak obtained together with a smooth background reproduces fairly well the experimental mass distribution observed in the $B_0\to {\bar{D}}^0{D}_s^{+}{\pi }^{-}$ decay.

    hep-phEPJ Web Conf.(2024)·4 citations
14. 14*

    Investigation on the bottom analogs of the $T_{cc}^{+}$

    Yu-Shan Ren🇨🇳 · Guang-Juan Wang🇯🇵 · Zhi Yang🇨🇳 · Jia-Jun Wu🇨🇳

    We investigate the doubly bottom state $T_{bb}^{-}$ composed of two bottom mesons with $J^P=1^{+}$. The potentials are obtained using the one-boson exchange model. With the heavy quark flavor symmetry, all the parameters in the model are determined by fitting the experimental data of doubly charmed state $T_{cc}^{+}$ from our previous work. Our analysis indicates that the isospin symmetry is well-preserved. We identify a deeply bound $T_{bb}^{-}$ state with quantum numbers $I(J^P)=0(1^{+})$, in contrast to the loosely bound $T_{cc}^{+}$. Additionally, we discover a resonant $T_{bb}^{-}$ state with $I(J^P)=1(1^{+})$. Furthermore, our investigation into the $\bar{B}{\bar{B}}^{\ast }$-${\bar{B}}^{\ast }{\bar{B}}^{\ast }$ coupled channel effect reveals its important impact. The binding energy of the bound $I(J^P)=0(1^{+})$ states becomes deeper, while the resonant $T_{bb}^{-}$ state with $I(J^P)=1(1^{+})$ remains nearly unchanged.

    hep-phPRD(2024)·7 citations
15. 15*

    Quantum radiation reaction spectrum of electrons in plane waves

    Greger Torgrimsson🇸🇪

    In previous works we derived equations for the average momentum of high-energy electrons experiencing quantum radiation reaction (RR) in strong electromagnetic plane-wave background fields. In this paper we derive similar equations for the momentum spectrum. We formulate the equations in terms of the cumulative function and study the relation between the equations for the spectrum and the equations for the moments, analyze the structure of the low-energy expansions, and finally explain how our formulation is essentially in terms of a ``Green's function'' which allows us to study the dynamics without choosing a specific initial wave packet (or particle-bunch distribution).

    hep-phhep-thphysics.plasm-phPRD(2024)·5 citations
16. 16*

    Two-loop master integrals for a planar topology contributing to $pp\to t\bar{t}j$

    Matteo Becchetti🇮🇹

    We report on recent progress for the QCD corrections to top quark pair plus jet production. In particular, we discuss a recent computation for the two-loop master integrals associated to a two-loop five-point pentagon-box integral configuration with one internal massive propagator, that contributes to top quark pair production in association with a jet in the QCD planar limit.

    hep-phhep-thPoS(2024)·0 citations
17. 17*

    Imprints of new physics in {\Lambda}_b decays into {\Lambda}*(1520)l^+ l^- in non-universal Z^' model

    S. Biswas🇮🇳 · S. Mahata🇮🇳 · B. P. Nayak🇮🇳 · S. Sahoo🇮🇳

    Inspired by various updated tantalizing results of LHCb on baryonic sector we study the {\Lambda}_b decays into {\Lambda}^* (1520)l^+ l^- decay in non-universal Z^' model. We present the four-fold angular distributions of the decay in terms of transversity amplitudes. We structure the observables: differential branching ratio, lepton side forward backward asymmetries and polarization fractions in terms of the transversity amplitudes and incorporate the new physics (NP) terms in it. We reduce the number of the form factors using the improved Isgur-Wise relations. We study the observables in the standard model (SM) as well as in non-universal Z^' model. The predicted values are very interesting for the high energy physics community and results might provide prominent footprints of NP.

    hep-phInternational Journal of Modern Physics A…·2 citations
18. 18*

    Numerical Unitarity for Binary Dynamics

    Fernando Febres Cordero🇺🇸

    We present a calculation of the conservative two-body Hamiltonian of a compact binary system including a spinning black hole. We include up-to third order corrections in Newton's constant $G$, all orders in velocity, and linear and quadratic terms in spin. The results are obtained from the classical limit of two-loop scattering amplitudes involving two massive scalars and two massive spin-1 particles minimally coupled to gravity. We discuss the usage of numerical techniques in our computation. In particular we show how the numerical unitarity method is well suited to obtain results of relevance to the physics program of current and future gravitational wave observatories.

    hep-phgr-qchep-thPoS(2024)·0 citations
19. 19*

    New Results from IR-Improved Amplitude-Based Resummation in Quantum Field Theory

    B.F.L. Ward (1)🇺🇸 · S. Jadach (2)🇵🇱 · W. Placzek (3)🇵🇱 · M. Skrzypek (2)🇵🇱 · Z.A. Was (2)🇵🇱 · S.A. Yost (4) ((1) Department of Physics, Baylor University, Waco, TX, USA, (2) Institute Of Nuclear Physics, Polish Academy of Sciences, Krakow, PL, (3) Institute of Applied Computer Science, Jagiellonian University, Krakow, PL, (4) Department of Physics, The Citadel, Charleston, SC, USA)🇺🇸

    There is a continuing effort to support and prepare the precision physics programs for the present and planned future colliders such as HL-LHC, FCC, CLIC, CEPC, and CPPC. We discuss new results from IR-improved amplitude-based resummation in quantum field theory relevant to such support and preparation with some emphasis on the interplay between soft and collinear resummation algebras.

    hep-phPoS(2024)·1 citation
20. 20*

    Monte Carlo Simulations of Factors Influencing Seasonal Variation of Multiple Muon Events

    Ellen Guan🇺🇸 · Maury Goodman🇺🇸

    In a 2015 study, particle physicists reported the first observed seasonal variation of multiple muon events in the MINOS Far and Near Detectors, where multiple muon events created by cosmic rays were observed to be more numerous in the winter than in the summer. This goes against the initial hypothesis of the researchers, because it has long been measured that single muon rates are higher in the summer. Using Python, I simulated three potential factors that could affect this: muon decay, altitude, and the fate of the leading pion from the first interaction. My data gives support to the conclusion that the seasonal variation is due to the geometry of the underground particle detectors and related to the higher altitude of the atmosphere in the summer.

    hep-ph1 citation
21. 21*

    $N_{\mathrm{eff}}$ as a new physics probe in the precision era of cosmology

    Yong Du🇨🇳

    We perform a global fit to the electroweak vertices and 4-fermion operators of the standard model effective field theory in this work using $N_{\mathrm{eff}}$ from cosmological probes, as well as data sets from colliders and low-energy experiments. We find $N_{\mathrm{eff}}$, both its current measurement and future projections, can only marginally improve the fit in both the flavor universal and the most general flavor scenarios. The resulting $1\sigma$ bound on $N_{\mathrm{eff}}$ is significantly improved from the global fit and becomes comparable to its current theoretical uncertainty, such that the latter will become important for this study at next generation experiments like future lepton colliders. $N_{\mathrm{eff}}$ from the global fit is also adopted to predict the primordial helium abundance $Y_P$, which significantly reduces the parameter space on the $Y_P$-$N_{\mathrm{eff}}$ plane. Through error propagation, we also conclude that reducing the experimental uncertainty of $Y_P$ from metal-poor galaxies down below 0.2% could play an important role in deepening our understanding on the free neutron lifetime anomaly.

    hep-phastro-ph.COPRD(2024)·3 citations
22. 22*

    Modular flavor models with positive modular weights: a new lepton model building

    Tatsuo Kobayashi🇯🇵 · Takaaki Nomura🇨🇳 · Hiroshi Okada🇯🇵 · Hajime Otsuka🇯🇵

    We propose an interesting assignment of positive modular wights for fields in a modular non-Abelian discrete flavor symmetry. By this assignment, we can construct inverse seesaw and linear seesaw models without any additional symmetries which possess good testability in current experiments. At first, we discuss probabilities for positive modular wights from a theoretical point of view. Then we show concrete examples of inverse seesaw and linear seesaw scenarios applying modular $A_4$ symmetry as examples and demonstrate some predictions as well as being consistent with experimental results such as their masses and mixings.

    hep-phJHEP(2024)·15 citations
23. 23*

    Quantification of the electric dipole moment generated by hadronic CP violation: resolution of the strong CP problem

    Nodoka Yamanaka🇯🇵

    The atomic, nuclear, and nucleon electric dipole moments (EDMs) have significant sensitivity to the CP violation of elementary particle physics, but its quantification has for long been obstructed by the nonperturbative physics of quantum chromodynamics. Quite recently, there were significant progresses in this field, notably the quantification of hadron level CP violation and the resolution of the strong CP problem. In this proceedings contribution, we summarize this attempt by focussing on the latter topic, the resulting new paradigm of baryogenesis, and the modifications that have to be applied in the evaluation of the EDMs.

    hep-ph1 citation
24. 24*

    A new method for calculating the soft anomalous dimension matrix for massive particle scattering

    Johannes M. Henn🇩🇪 · Calum Milloy🇮🇹 · Kai Yan🇨🇳

    The general structure of infrared divergences in the scattering of massive particles is captured by the soft anomalous dimension matrix. The latter can be computed from a correlation function of multiple Wilson lines. The state-of-the-art two-loop result has a tantalizingly simple structure that is not manifest in the calculations. We argue that the complexity in intermediate steps of the known calculations comes from spurious, regulator-dependent terms. Based on this insight we propose a different infrared regulator that is associated to only one of the Wilson lines. We demonstrate that this streamlines obtaining the two-loop result: computing the required Feynman integrals via the differential equations method, only multiple polylogarithmic functions appear (to all orders in the dimensional regulator), as opposed to elliptic polylogarithms. We show that the new method is promising for higher-loop applications by computing a three-loop diagram of genuine complexity, and provide the answer in terms of multiple polylogarithms. The relatively simple symbol alphabet we obtain may be of interest for bootstrap approaches.

    hep-phhep-thJHEP(2024)·7 citations
25. 25*

    Multi-source thermal model describing multi-region structure of transverse momentum spectra of identified particles and parameter dynamics of system evolution in relativistic collisions

    Jia-Yu Chen🇨🇳 · Mai-Ying Duan🇨🇳 · Fu-Hu Liu · Khusniddin K. Olimov🇺🇿

    In this article, the multi-region structure of transverse momentum ($p_T$) spectra of identified particles produced in relativistic collisions is studied by the multi-component standard distribution (the Boltzmann, Fermi-Dirac, or Bose-Einstein distribution) in the framework of a multi-source thermal model. Results are interpreted in the framework of string model phenomenology in which the multi-region of $p_T$ spectra corresponds to the string hadronization in the cascade process of string breaking. The contributions of the string hadronizations from the first-, second-, and third-, i.e., last-generations of string breakings mainly form high-, intermediate-, and low-$p_T$ regions, respectively. From the high- to low-$p_T$ regions, the extracted volume parameter increases rapidly, and temperature and flow velocity parameters decrease gradually. The multi-region of $p_T$ spectra reflects the volume, temperature, and flow velocity dynamics of the system evolution. Due to the successful application of the multi-component standard distribution, this work reflects that the simple classical theory can still play a great role in the field of complex relativistic collisions.

    hep-phhep-exnucl-exnucl-thIndian J.Phys.(2024)·6 citations
26. 26*

    Tensor glueball decay into nucleon-antinucleon

    Arthur Vereijken🇵🇱

    In the context of a chiral hadronic model, we compute the decay ratio of a tensor glueball decaying into a nucleon and antinucleon compared to the decay into 2 pions. Tensor meson dominance is assumed to also hold for the tensor glueball in order to relate the coupling constants of the different decay channels. We find that the decay width to nucleons is slightly larger than the decay width to pions, but still in the same order of magnitude.

    hep-phNuovo Cim.C(2024)·0 citations
27. 27*

    Study (using a chiral effective Lagrangian model) of the scalar and pseudoscalar meson mass spectrum of QCD at finite temperature, above $T_c$

    Enrico Meggiolaro🇮🇹

    In this work, we analyze (using a chiral effective Lagrangian model) the scalar and pseudoscalar meson mass spectrum of QCD at finite temperature, above the chiral transition at $T_c$, in the realistic case with $N_f=2+1$ light quark flavors (that is, with $m_{u,d}\to 0$ and $m_s\ne 0$), looking, in particular, for signatures of the breaking of the $U(1)$ axial symmetry above $T_c$. A critical comparison with the corresponding results obtained (in a previous study) in the two limit cases $N_f=2$ and $N_f=3$ and with the available lattice results is performed, together with a discussion on the limits of validity of a description in terms of a chiral effective Lagrangian model.

    hep-phhep-lathep-th2 citations
28. 28*

    Modulus stabilisation in the multiple-modulus framework

    Stephen F. King🇬🇧 · Xin Wang🇬🇧

    In a class of modular-invariant models with multiple moduli fields, the viable lepton flavour mixing pattern can be realised if the values of moduli are selected to be at the fixed points. In this paper, we investigate a modulus stabilisation mechanism in the multiple-modulus framework which is capable of providing de Sitter (dS) minima precisely at the fixed points $\tau =\mathrm{i}$ and $\omega$, by taking into consideration non-perturbative effects on the superpotential and the dilaton Kähler potential. Due to the existence of additional Kähler moduli, more possible vacua can occur, and the dS vacua could be the deepest under certain conditions. We classify different choices of vacua, and discuss their phenomenological implications for lepton masses and flavour mixing.

    hep-phPRD(2024)·26 citations
29. 29*

    Decays of fully beauty scalar tetraquarks to $B_q{\overline{B}}_q$ and $B_q^{\ast }{\overline{B}}_q^{\ast }$ mesons

    S. S. Agaev🇦🇿 · K. Azizi🇮🇷 · B. Barsbay🇹🇷 · H. Sundu🇹🇷

    Decays of the fully beauty four-quark structures $X_{4b}$ and $T_{4b}$ to $B$ meson pairs are investigated in the framework of QCD three-point sum rule method. We model the scalar exotic mesons $X_{4b}$ and $T_{4b}$ as diquark-antidiquark systems composed of the axial-vector and pseudoscalar diquarks, respectively. The masses $m=(18540\pm 50)\mathrm{MeV}$ and $\tilde{m}=(18858\pm 50)\mathrm{MeV}$ of these compounds calculated in our previous articles, fix possible decay channels of these particles. In the present work, we consider their decays to $B_q{\overline{B}}_q$ and $B_q^{\ast }{\overline{B}}_q^{\ast }(q=u,d,s,c)$ mesons. In the case of $X_{4b}$ the mass of which is below the $2{\eta }_b$ threshold, these channels determine essential part of its full width ${\Gamma }_{4b}$. The tetraquark $T_{4b}$ can decay to the pair ${\eta }_b{\eta }_b$, therefore partial widths of processes with $B(B^{\ast })$ mesons in the final state permit us to refine our estimate for the full width of this particle. The predictions ${\Gamma }_{4b}=(9.6\pm 1.1)\mathrm{MeV}$ and ${\tilde{\Gamma }}_{4b}^{\mathrm{Full}}=(144\pm 29)\mathrm{MeV}$ obtained in this article can be used in future experimental investigations of four $b$-quark mesons.

    hep-phhep-exhep-latPRD(2024)·27 citations
30. 30*

    Nuclear deexcitation simulator for neutrino interactions and nucleon decays of ${}^{12}\text{C}$ and ${}^{16}\text{O}$ based on TALYS

    Seisho Abe🇯🇵

    Nuclear deexcitation associated with neutrino interactions and nucleon decays has a significant impact on a recent key observable for neutrino detectors: neutron multiplicity. However, most existing neutrino Monte Carlo event generators do not consider this process. For a comprehensive prediction of the neutron multiplicity, a nuclear deexcitation simulator based on TALYS named NucDeEx is developed. NucDeEx can be used for neutrino interactions and nucleon decayes for ${}^{12}\text{C}$ and ${}^{16}\text{O}$. The author provides the NucDeEx codes and sample codes for applying the NucDeex to widely-used neutrino Monte Carlo event generators, NEUT, NuWro, and GENIE.

    hep-phhep-exnucl-thPRD(2024)·14 citations
31. 31*

    Full NNLO QCD corrections to diphoton production

    Federico Coro🇪🇸

    We consider the diphoton production in hadronic collisions at the next-to-next-to-leading order (NNLO) in perturbative QCD, taking into account for the first time the full top quark mass dependence. We present the computation of the two-loop form factors for diphoton production in the quark annihilation channel, that are relevant for the phenomenological studies of the full NNLO. The MIs are written in the so-called canonical logarithmic form, except for the elliptic ones. We perform a study on the Maximal Cut in order to show the elliptic behaviour of the non-planar topology. The Master Integrals are evaluated by means of differential equations in a semy-analitical approach through the generalised power series technique. Finally we use this result with all the other contributions showing selected numerical distributions.

    hep-phhep-thPoS(2024)·2 citations
32. 32*

    Composite 2-Higgs Doublet Model: Strong Effects on Higgs Pair Production

    Stefania De Curtis🇮🇹 · Luigi Delle Rose🇮🇹 · Felix Egle🇩🇪 · Stefano Moretti🇬🇧 · Margarete Mühlleitner🇩🇪 · Kodai Sakurai🇯🇵

    We show how effects of compositeness emerging in a Composite 2-Higgs Doublet Model can enter Standard Model (SM)-like Higgs pair production at the Large Hadron Collider in both resonant and non-resonant mode. Such effects can arise from modified trilinear Higgs self-couplings and top-Yukawa couplings as well as from loops of new heavy quarks and additional quartic Higgs-fermion interactions. In the resonant case, significant distortions of the Breit- Wigner shape of a new scalar state decaying into the two SM-like Higgs states may occur due to interference effects amongst not only the SM-like diagrams but also those involving the new heavy quarks. In the non-resonant case, a modification of the underlying line-shape and a local maximum at twice a new heavy quark mass appear simultaneously. We quantify these effects by taking into account the relevant theoretical and latest experimental bounds.

    hep-phJHEP(2024)·11 citations
33. 33*

    Linearly polarized gluon density in the rescaling model

    N.A. Abdulov🇷🇺 · X. Chen🇨🇳 · A.V. Kotikov🇷🇺 · A.V. Lipatov🇷🇺

    The low-x behavior of the linearly polarized gluon density h_{g}(x,k_t^2, Q^2) in nuclei is studied in the rescaling model at small transverse momentum k_t.

    hep-phJETP Lett.(2023)·2 citations
34. 34*

    Di-Higgs productions at N${}^3$LO+N${}^3$LL

    A.H. Ajjath · Hua-Sheng Shao🇫🇷

    In this talk, we discuss the soft-gluon resummation for a pair of Higgs bosons in the dominant gluon fusion channel to next-to-next-to-next-to-leading logarithmic (N${}^3$LL) accuracy. Through the study, we achieve sub-percent level accuracy in the uncertainties from the residual renormalisation and factorisation scales, for both inclusive and differential mass distribution in the infinite top quark mass limit. We also combine these results with the full top mass dependent next-to-leading order calculations.

    hep-phPoS(2024)·1 citation
35. 35*

    Exploring spin of ultralight dark matter with gravitational wave detectors

    Yusuke Manita🇯🇵 · Hiroki Takeda🇯🇵 · Katsuki Aoki🇯🇵 · Tomohiro Fujita🇯🇵 · Shinji Mukohyama🇯🇵

    We propose a novel method for distinguishing the spin of ultralight dark matter (ULDM) using interferometric gravitational wave detectors. ULDM can be a bosonic field of spin-0, 1, or 2, and each induces distinctive signatures in signals. We find that the finite-time traveling effect causes a dominant signal for spin-0 and spin-1 ULDM, while not for spin-2. By using overlap reduction functions (ORF) of multiple detectors, we can differentiate between the spins of ULDM. Furthermore, we point out that the current constraint on the coupling constant of spin-1 ULDM to baryons becomes 30 times weaker when the finite-time light-travel effect on the ORF is taken into account.

    hep-phastro-ph.COgr-qcPRD(2024)·23 citations
36. 36*

    Bounds on the Equation of State from QCD Inequalities and Lattice QCD

    Yuki Fujimoto🇺🇸 · Sanjay Reddy🇺🇸

    We derive robust bounds on the equation of state (EoS) at finite baryon chemical potential using QCD inequalities and input from recent lattice-QCD calculations of thermodynamic properties of matter at nonzero isospin chemical potential. We use lattice data to deduce an upper bound on the baryon density of the symmetric nuclear matter at a given baryon chemical potential and a lower bound on the pressure as a function of the energy density. We also use constraints from perturbative calculations of the QCD EoS at high density derived in earlier work and causality to delineate robust bounds on the EoS of isospin symmetric matter at densities relevant to heavy-ion collisions.

    ↳ nucl-thhep-lathep-phPRD(2024)·31 citations
37. 37*

    New Hadrons Discovered at BESIII

    Zhiqing Liu🇨🇳 · Ryan E. Mitchell🇺🇸

    The BESIII experiment starts to run at 2009 and has submitted 500 publications during the past 15 years. This article reviews the 26 new hadrons discovered at BESIII, dedicated to the celebration of this event.

    ↳ hep-exhep-phSci.Bull.(2023)·16 citations
38. 38*

    Implications of ALP-photon conversion for the diffuse gamma-ray background associated with high-energy neutrinos

    Kirill Riabtsev🇬🇧

    Some fraction of the diffuse photon background is supposed to be linked to high-energy neutrinos by astrophysical mechanisms of production and electromagnetic cascades. This article presents a simulation study of axion-like particles (ALPs) implications for that component, exploiting transport equations. Alternations of that spectrum due to ALP-photon conversion in the intergalactic magnetic field (IGMF) in the cases of various ALP parameters and mixing regimes at sources are studied. The results indicate considerable influence of IGMF-conversion on the ALP-photon flux even in the case of inverse ALP-photon coupling constant $M$ equal to $10^{11.5}$ GeV and some residual effects in the case of $M=10^{12}$ GeV. Furthermore, the scenario shows another aspect of a complex multimessenger interplay between IceCube and Fermi data, to a certain extent relieving the tension between them.

    ↳ astro-ph.HEhep-phPLB(2024)·1 citation
39. 39*

    Flow Oriented Perturbation Theory

    Alexandre Salas-Bernárdez🇪🇸 · Michael Borinsky🇨🇭 · Zeno Capatti🇨🇭 · Eric Laenen🇳🇱

    Flow Oriented Perturbation Theory (FOPT) is a novel approach to Feynman diagrams based on the coordinate (position) space description of Quantum Field Theories (QFT). FOPT offers interesting features regarding the computation of higher-loop Feynman amplitudes such as combinatorial and canonical Feynman rules, explicit infrared singularity factorization on a per-diagram level and the potential to have manifest cancellation of real and virtual singularities. In these proceedings we briefly summarize the derivation of FOPT and present its Feynman rules for covariant diagrams, S-matrix elements and cut diagrams in massless scalar QFT, supported by examples. We then discuss the extension of FOPT to massless fermion fields and indicate steps towards the treatment of massive lines in arbitrary dimensions.

    ↳ hep-thhep-phPoS(2024)·1 citation
40. 40*

    Vavilov-Cherenkov emission with a twist: a study of the final entangled state

    A.D. Chaikovskaia🇷🇺 · D.V. Karlovets🇷🇺 · V.G. Serbo🇷🇺

    We present a theoretical investigation of the Vavilov-Cherenkov (VC) radiation by a plane-wave or twisted electron. Special emphasis is put on the question whether and at what conditions the emitted VC photons can be twisted. For this aim we obtain a general expression in the coordinate and momentum representations for the quantum state of the final electron-photon system that is a result of the radiation process itself and does not depend on the properties of a detector. It is shown that this evolved state is an entangled state of an electron and a photon, and both particles can be twisted. A direct consequence of this result follows: if one uses a detector sensitive to the twisted electron (photon) with the definite projection of the total angular momentum (TAM), then the final photon (electron) also will be in the twisted state with a definite TAM projection. Further, we investigate the polarization properties of the final twisted photon in more general conditions than has been calculated before. Finally, we exploit a close similarity between the discussed VC radiation and the process of the equivalent photon emission in the Weizsäcker-Williams method and find the corresponding final state.

    ↳ quant-phhep-phPRA(2024)·10 citations
41. 41*

    Till the core collapses: the evolution and properties of self-interacting dark matter subhalos

    Zhichao Carton Zeng🇺🇸 · Annika H. G. Peter🇺🇸 · Xiaolong Du🇺🇸 · Shengqi Yang🇺🇸 · Andrew Benson🇺🇸 · Francis-Yan Cyr-Racine🇺🇸 · Fangzhou Jiang🇺🇸 · Charlie Mace🇺🇸 · R. Benton Metcalf🇮🇹

    One of the hottest questions in the cosmology of self-interacting dark matter (SIDM) is whether scatterings can induce detectable core-collapse in halos by the present day. Because gravitational tides can accelerate core-collapse, the most promising targets to observe core-collapse are satellite galaxies and subhalo systems. However, simulating small subhalos is computationally intensive, especially when subhalos start to core-collapse. In this work, we present a hierarchical framework for simulating a population of SIDM subhalos, which reduces the computation time to linear order in the total number of subhalos. With this method, we simulate substructure lensing systems with multiple velocity-dependent SIDM models, and show how subhalo evolution depends on the SIDM model, subhalo mass and orbits. We find that an SIDM cross section of $\gtrsim 200$ cm${}^2$/g at velocity scales relevant for subhalos' internal heat transfer is needed for a significant fraction of subhalos to core-collapse in a typical lens system at redshift $z=0.5$, and that core-collapse has unique observable features in lensing. We show quantitatively that core-collapse in subhalos is typically accelerated compared to field halos, except when the SIDM cross section is non-negligible ($\gtrsim \mathcal{O}(1)$ cm${}^2$/g) at subhalos' orbital velocities, in which case evaporation by the host can delay core-collapse. This suggests that substructure lensing can be used to probe velocity-dependent SIDM models, especially if line-of-sight structures (field halos) can be distinguished from lens-plane subhalos. Intriguingly, we find that core-collapse in subhalos can explain the recently reported ultra-steep density profiles of substructures found by lensing with the \emph{Hubble Space Telescope}

    ↳ astro-ph.GAastro-ph.COastro-ph.HEhep-phPRD(2025)·27 citations
42. 42*

    Exact Renormalization of the Higgs Field

    Kang-Sin Choi🇰🇷

    Using Wilsonian renormalization, we calculate the quantum correction to observable quantities, rather than the bare parameters, of the Higgs field. A physical parameter, such as a mass-squared or a quartic coupling, at an energy scale $\mu$ is obtained from that at a reference scale by integrating in the degrees of freedom in between. In this process, heavy modes decouple and the ultraviolet scale dependence is canceled in the observables. An exact renormalization group equation is parametrized by the low-energy scale $\mu$.

    ↳ hep-thhep-phPRD(2024)·4 citations
43. 43*

    Host Galaxies for Four Nearby CHIME/FRB Sources and the Local Universe FRB Host Galaxy Population

    Mohit Bhardwaj · Daniele Michilli · Aida Yu. Kirichenko · Obinna Modilim · Kaitlyn Shin · Victoria M. Kaspi · Bridget C. Andersen · Tomas Cassanelli · Charanjot Brar · Shami Chatterjee · Amanda M. Cook · Fengqiu Adam Dong and 15 other authors

    We present the host galaxies of four apparently non-repeating fast radio bursts (FRBs), FRBs 20181223C, 20190418A, 20191220A, and 20190425A, reported in the first Canadian Hydrogen Intensity Mapping Experiment (CHIME/FRB) catalog. Our selection of these FRBs is based on a planned hypothesis testing framework where we search all CHIME/FRB Catalog-1 events that have low extragalactic dispersion measure (< 100 pc cm${}^{-3}$), with high Galactic latitude (|b| > 10$\mathrm{deg}$) and saved baseband data. We associate the selected FRBs to galaxies with moderate to high star-formation rates located at redshifts between 0.027 and 0.071. We also search for possible multi-messenger counterparts, including persistent compact radio and gravitational wave (GW) sources, and find none. Utilizing the four FRB hosts from this study along with the hosts of 14 published local Universe FRBs (z < 0.1) with robust host association, we conduct an FRB host demographics analysis. We find all 18 local Universe FRB hosts in our sample to be spirals (or late-type galaxies), including the host of FRB 20220509G, which was previously reported to be elliptical. Using this observation, we scrutinize proposed FRB source formation channels and argue that core-collapse supernovae are likely the dominant channel to form FRB progenitors. Moreover, we infer no significant difference in the host properties of repeating and apparently non-repeating FRBs in our local Universe FRB host sample. Finally, we find the burst rates of these four apparently non-repeating FRBs to be consistent with those of the sample of localized repeating FRBs observed by CHIME/FRB. Therefore, we encourage further monitoring of these FRBs with more sensitive radio telescopes.

    ↳ astro-ph.HEastro-ph.GAhep-phApJL(2024)·85 citations
44. 44*

    Klein-Gordon particles in a quasi-pointlike global monopole spacetime and a Wu-Yang magnetic monopole: invariance and isospectrality

    Omar Mustafa🇹🇷

    We use two correlated metric functions and transform/deform the pointlike global monopole (PGM) spacetime metric into a quasi-PGM (QPGM) spacetime one. We study Klein-Gordon (KG) particles (manifestly introduced by the non-minimal coupling form of the operator , with ${\mathcal{F}}_{\mu }$ , and $D_{\mu }={\partial }_{\mu }-ie{A}_{\mu }$) in such QPGM spacetime background. We show that the KG-particles in the QPGM spacetime are isospectral and invariant with KG-particles in the PGM spacetime, provided that the two metric functions are correlated. The Wu-Yang magnetic monopole (WYMM) is also included in the process. We report the effects of both monopoles PGM/QPGM and WYMM on the spectroscopic structure of two models, KG-oscillators and KG-Coulomb particles in such spacetime background. Moreover, we discuss KG-Coulomb particles and shifted KG-oscillators in a PGM spacetime and a WYMM, where such models are manifestly introduced by some Lorentz scalar interaction potentials $S(r)$. The current study is not only of fundamental observability nature but also of pedagogical interest in quantum gravity.

    ↳ gr-qchep-phmath-phmath.MPJ.Phys.G(2024)·11 citations
45. 45*

    MHz to TeV expectations from scotogenic WIMP dark matter

    Laura Eisenberger🇩🇪 · Thomas Siegert🇩🇪 · Karl Mannheim🇩🇪 · Werner Porod🇩🇪

    The indirect search for dark matter is typically restricted to individual photon bands and instruments. In the context of multiwavelength observations, finding a weak signal in large fore- and backgrounds at only one wavelength band is hampered by systematic uncertainties dominating the signal strength. Dark matter particle annihilation is producing Standard Model particles of which the prompt photon emission is searched for in many studies. However, also the secondary emission of charged particles from dark matter annihilation in the TeV range results in comparable or even stronger fluxes in the GHz-GeV range. In this study, we calculate the prompt and secondary emission of a scotogenic WIMP with a mass of $1\mathrm{TeV}$ in 27 dwarf galaxies of the Milky Way. For the secondary emission, we include Inverse Compton scattering, bremsstrahlung, and synchrotron radiation, which results in a "triple hump" structure characteristic for only dark matter and no other astrophysical source. In order to determine the best candidates for multi-instrument analyses, we estimate the diffuse emission component of the Milky Way itself, including its own dark matter halo from the same scotogenic WIMP model. We find signal-to-background ratios of individual sources on the order of $10^{-3}$-$10^{-2}$ across X- to $\gamma$-rays assuming $J$-factors for the cold dark matter distribution inferred from observations and no additional boosting due to small-scale clumping. We argue that a joint multi-wavelength analysis of all nearby galaxies as well as the extension towards the Cosmic Gamma-ray Background is required to disentangle possible dark matter signals from astrophysical back- and foregrounds.

    ↳ astro-ph.HEastro-ph.COhep-phMNRAS(2024)·4 citations
46. 46*

    Flavour Physics at LHCb -- 50 years of the KM paradigm

    Patrick Koppenburg🇳🇱

    The LHCb experiment is in operation since 2009 and has provided measurements of the KM matrix with unprecedented precision. 50 years after the original paper we are in the position of pinning down the parameters of the theory, or possibly to show its limitations. In these proceedings the status of LHCb is shown in a historical perspective, along with some anecdotes.

    ↳ hep-exhep-phPTEP(2025)·5 citations
47. 47*

    Pion Valence-Quark Generalized Parton Distribution at Physical Pion Mass

    Huey-Wen Lin🇺🇸

    We present the first lattice-QCD $x$-dependent pion valence-quark generalized parton distribution (GPD) calculated directly at physical pion mass using the Large-Momentum Effective Theory (LaMET) with next-to-next-to-leading order perturbative matching correction. We use clover fermions for the valence action on $2+1+1$ flavors of highly improved staggered quarks (HISQ), generated by MILC Collaboration, with lattice spacing $a\approx 0.09$fm and box size $L\approx 5.5$fm; the pion two-point measurements number up to $O(10^6)$ with boost momentum 1.73GeV. The pion valence distribution is renormalized in hybrid scheme with Wilson-line mass subtraction at large distances in coordinate space, followed by a procedure to match it to the $\overline{\text{MS}}$ scheme. We focus on the zero-skewness limit, where the GPD has a probability-density interpretation in the longitudinal Bjorken $x$ and the transverse impact-parameter distributions. We take the integral of our GPD functions to generate leading moment so that we can make comparisons with past lattice-QCD and experimental determinations of the pion form factors and found consistent agreement among them. We predict the higher GPD moments and reveal $x$-dependent tomography of the pion for the first time using lattice QCD.

    ↳ hep-lathep-phPLB(2023)·36 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.