HEP Phenomenology·hep-ph

Thu·Aug 31, 2023Thursday·August 31, 2023

31 papers—19 primary·12 cross-listed·reconstructed*

01*
Not all that is $β_{0}$ is $β$ -function: the DGLAP resummation and the running coupling in NLO JIMWLK
Alex Kovner🇺🇸 · Michael Lublinsky🇮🇱 · Vladimir V. Skokov🇺🇸 · Zichen Zhao🇺🇸
We reanalyze the origin of the large transverse logarithms associated with the QCD one loop beta-function coefficient in the NLO JIMWLK Hamiltonian. We show that some of these terms are not associated with the running of the QCD coupling constant but rather with the DGLAP evolution. The DGLAP-like resummation of these logarithms is mandatory within the JIMWLK Hamiltonian, as long as the color correlation length in the projectile is larger than that in the target. This regime in fact covers the whole range of rapidities at which JIMWLK evolution is supposed to be applicable. We derive the RG equation that resums these logarithms to all orders in alpha_s in the JIMWLK Hamiltonian. This is a nonlinear equation for the eikonal scattering matrix S(x). We solve this equation and perform the DGLAP resummation in two simple cases: the dilute limit, where both the projectile and the target are far from saturation, and the saturated regime, where the target correlation length also determines its saturation momentum.
hep-phJHEP(2024)·13 citations
02*
Production of bound states of magnetic monopoles in high energy collisions at LHC
João Vitor Bulhões da Silva🇧🇷 · Werner Krambeck Sauter🇧🇷
In this work, we present the studies carried out for the production of the monopolium at the LHC in ultraperipheral collisions for the processes $pp$ and $P b P b$ . The monopolium is described by the bound state of a monopole-antimonopole pair, and we assume the study of the monopole in this characteristic state because the coupling constant is very large, which allows us to suggest that this exotic particle can be produced in the bound state. The monopolium is defined by a wave function arising from the numerical solution of the Schrödinger equation for the modified Cornell potential. We used the photon fusion production mechanism, with the Weizsäcker-Williams and Drees-Zeppenfeld expressions to describe the lead and proton equivalent photon distributions. We estimate a high production rate of monopolium production for $pp$ collisions with $s = 14$ TeV and $P b P b$ collisions with $s = 5.5$ TeV in LHC.
hep-phInt.J.Mod.Phys.A(2024)·4 citations
03*
Examining the sensitivity of FASER to Generalized Neutrino Interactions
F. J. Escrihuela🇪🇸 · L. J. Flores🇲🇽 · O. G. Miranda🇲🇽 · Javier Rendón🇲🇽 · R. Sánchez-Vélez🇲🇽
We investigate the sensitivity of the FASER $ν$ detector, a novel experimental setup at the LHC, to probe and constrain generalized neutrino interactions (GNI). Employing a comprehensive theoretical framework, we model the effects of generalized neutrino interactions on neutrino-nucleon deep inelastic scattering processes within the FASER $ν$ detector. By considering all the neutrino channels produced at the LHC, we perform a statistical analysis to determine the sensitivity of FASER $ν$ to constrain these interactions. Our results demonstrate that FASER $ν$ can place stringent constraints on the GNI effective couplings. Additionally, we study the relation between GNI and a minimal Leptoquark model where the SM is augmented by a singlet Leptoquark with hypercharge $1/3$ . We have found that the sensitivities for various combinations of the Leptoquark Yukawa couplings are approximately $O (1)$ , particularly when considering a Leptoquark mass in the TeV range.
hep-phJHEP(2024)·7 citations
04*
BubbleDet: A Python package to compute functional determinants for bubble nucleation
Andreas Ekstedt🇸🇪 · Oliver Gould🇬🇧 · Joonas Hirvonen🇫🇮
We present a Python package, BubbleDet, for computing one-loop functional determinants around spherically symmetric background fields. This gives the next-to-leading order correction to both the vacuum decay rate, at zero temperature, and to the bubble nucleation rate in first-order phase transitions at finite temperature. For predictions of gravitational wave signals from cosmological phase transitions, this is expected to remove one of the leading sources of theoretical uncertainty. BubbleDet is applicable to arbitrary scalar potentials and in any dimension up to seven. It has methods for fluctuations of scalar fields, including Goldstone bosons, and for gauge fields, but is limited to cases where the determinant factorises into a product of separate determinants, one for each field degree of freedom. To our knowledge, BubbleDet is the first package dedicated to calculating functional determinants in spherically symmetric background
hep-phastro-ph.COhep-thJHEP(2023)·82 citations
05*
Comparison between $μ^{-} μ^{+}$ and $e^{-} e^{+}$ colliders for charged Higgs production in 2HDM
Brahim Ait Ouazghour🇲🇦 · Abdesslam Arhrib🇲🇦 · Kingman Cheung🇹🇼 · Es-said Ghourmin🇲🇦 · Larbi Rahili🇲🇦
We study the phenomenology of the charged Higgs boson at future muon colliders. We investigate both the pair production $μ^{+} μ^{-} \to H^{+} H^{-}$ , the single production $μ^{+} μ^{-} \to W^{\pm} H^{\mp}$ , as well as the Vector Boson Fusion (VBF) ${e^{+} e^{-}, μ^{+} μ^{-}} \to ν ν ˉ H^{+} H^{-}$ . We show that the neutral Higgs exchange diagrams in the muon collider case can lead to a significant boost in the cross sections through their Yukawa couplings. Our results for the muon collider are systematically compared to the corresponding ones at $e^{+} e^{-}$ machines. It is demonstrated that the vector boson fusion (VBF) $e^{+} e^{-} \to ν ν ˉ H^{+} H^{-}$ can compete with the mentioned $2 \to 2$ processes. We select benchmark points and perform signal-background analyses, taking into account detector simulations. We demonstrate the discovery region at $5 σ$ and the excluded region at $2 σ$ levels at a 3 TeV muon collider.
hep-phPRD(2024)·19 citations
06*
Fluctuations and correlations of baryonic chiral partners
Volker Koch🇺🇸 · Michał Marczenko🇵🇱 · Krzysztof Redlich🇵🇱 · Chihiro Sasaki🇵🇱
Fluctuations and correlations of the net-baryon number play an important role in exploring critical phenomena in phase transitions of strongly interacting matter governed by Quantum chromodynamics (QCD). In this work, we use the parity doublet model to investigate the fluctuations of the net-baryon number density in hot and dense hadronic matter. The model accounts for chiral criticality within the mean-field approximation. We focus on the qualitative properties and systematics of the first- and second-order susceptibility of the net-baryon number density, and their ratios for nucleons of positive and negative parity, as well as their correlator. We show that the fluctuations of the positive-parity nucleon do not necessarily reflect the fluctuations of the total net-baryon number density at the phase boundary of the chiral phase transition. We also investigate the non-trivial structure of the correlator. Furthermore, we discuss and quantify the differences between the fluctuations of the net-baryon number density in the vicinity of the chiral and liquid-gas phase transition in nuclear matter. We indicate a possible relevance of our results with the interpretation of the experimental data on net-proton number fluctuations in heavy-ion collisions.
hep-phnucl-thPRD(2024)·19 citations
07*
Higgs Probes of axion-like particles
Masashi Aiko🇯🇵 · Motoi Endo🇯🇵
We study axion-like particle contributions to the Higgs boson decays. The particle is assumed to couple with the standard model electroweak gauge bosons. Although direct productions of axion-like particles have often been discussed, we investigate indirect contributions to the Higgs boson decays into fermions, photons, $W$ , and $Z$ bosons at the one-loop level. It is found that the corrections to the fermions are suppressed, whereas precise measurements of the di-photon channel of the Higgs boson decay can provide a significant probe of the model especially when the axion-like particle is heavy and its coupling to di-photon is suppressed.
hep-phJHEP(2023)·4 citations
08*
Approximate Bound State Solutions of the Fractional Schrödinger Equation under the Spin-Spin-Dependent Cornell Potential
M. Abu-Shady🇪🇬 · E. Omugbe🇳🇬 · E.P. Inyang🇳🇬
In this work, the approximate bound state solutions of the fractional Schrödinger equation under a spin-spin-dependent Cornell potential are obtained via the convectional Nikiforov-Uvarov approach. The energy spectra are applied to obtain the mass spectra of the heavy mesons such as bottomonium, charmonium and bottom-charm. The masses for the singlet and triplet spin numbers increase as the quantum numbers increase. The fractional Schrödinger equation improves the mass spectra compared to the masses obtained in the existing literature. The bottomonium masses agree with the experimental data of the Particle Data Group where percentage errors for fractional parameters of \b{eta}=1,{\alpha}=0.97 and \b{eta}=1,{\alpha}=0.50 were found to be 0.67% and 0.49% respectively. The respective percentage errors of 1.97% and 1.62% for fractional parameters of \b{eta}=1,{\alpha}=0.97 and \b{eta}=1,{\alpha}=0.50 were obtained for charmonium meson. The results indicate that the potential curves coupled with the fractional parameters account for the short-range gluon exchange between the quark-antiquark interactions and the linear confinement phenomena which is associated with the quantum chromo-dynamic and phenomenological potential models in particle and high-energy physics
hep-ph0 citations
09*
Shedding light on neutrino self-interactions with solar antineutrino searches
Quan-feng Wu🇨🇳 · Xun-Jie Xu🇨🇳
Solar antineutrinos are absent in the standard solar model prediction. Consequently, solar antineutrino searches emerge as a powerful tool to probe new physics capable of converting neutrinos into antineutrinos. In this study, we highlight that neutrino self-interactions, recently gaining considerable attention due to their cosmological and astrophysical implications, can lead to significant solar antineutrino production. We systematically explore various types of four-fermion effective operators and light scalar mediators for neutrino self-interactions. By estimating the energy spectra and event rates of solar antineutrinos at prospective neutrino detectors such as JUNO, Hyper-Kamiokande, and THEIA, we reveal that solar antineutrino searches can impose stringent constraints on neutrino self-interactions and probe the parameter space favored by the Hubble tension.
hep-phastro-ph.COastro-ph.HEastro-ph.SR+1JCAP(2024)·12 citations
10*
Refined renormalization group improvement for thermally resummed effective potential
Koichi Funakubo🇯🇵 · Eibun Senaha
We newly develop a renormalization group (RG) improvement for thermally resummed effective potentials. In this method, $β$ -functions are consistently defined in resummed perturbation theories, so that order-by-order RG invariance is not spoiled after thermal resummation. With this improvement, scale dependences of phase transition quantities such as a critical temperature, which are known to be notoriously large at the one-loop order, are greatly reduced compared to calculations with the conventional $MS$ scheme. By taking advantage of the RG invariance, we also devise a resummation method that can incorporate potentially harmful large logarithmic terms and temperature-dependent power corrections in a generic form. We point out that a resummed one-loop effective potential refined by the method can give results that agree with those obtained by resummed two-loop effective potentials within errors.
hep-phPRD(2024)·7 citations
11*
A new observable for $W$ -mass determination
Luca Rottoli🇨🇭 · Paolo Torrielli🇮🇹 · Alessandro Vicini🇮🇹
In this contribution we discuss the properties of the jacobian asymmetry, the new observable introduced in hep-ph/2301.04059 for a robust determination of the value and uncertainty of the $W$ -boson mass at hadron colliders.
hep-phhep-exPoS(2024)·4 citations
12*
Isospectrality and configurational entropy as testing tools for bottom-up AdS/QCD
Miguel Angel Martin Contreras🇨🇳 · Alfredo Vega🇨🇱 · Saulo Diles🇧🇷
This work discusses the connection between isospectrality and configurational entropy in holographic bottom-up models. We analyze the effect of monoparametric isospectral transformation in holographic decay constants and configurational entropy for a set of softwall-like models at zero temperature. We conclude that the isospectral parameter $λ$ defines a window of possible holographic models suitable to describe spectroscopy.
hep-phhep-thPLB(2024)·10 citations
13*
Neutrino constraints on inelastic dark matter captured in the Sun
Bhavesh Chauhan🇺🇸 · Mary Hall Reno🇺🇸 · Carsten Rott🇺🇸 · Ina Sarcevic🇺🇸
The flux of neutrinos from annihilation of gravitationally captured dark matter in the Sun has significant constraints from direct-detection experiments. However, these constraints are relaxed for inelastic dark matter as inelastic dark matter interactions generate less energetic nuclear recoils compared to elastic dark matter interactions. In this paper, we explore the possibility for large volume underground neutrino experiments to detect the neutrino flux from captured inelastic dark matter in the Sun. The neutrino spectrum has two components: a mono-energetic "spike" from pion and kaon decays at rest and a broad-spectrum "shoulder" from prompt primary meson decays. We focus on detecting the shoulder neutrinos from annihilation of hadrophilic inelastic dark matter with masses in the range 4-100 GeV and the mass splittings in up to 300 keV. We determine the event selection criterion for DUNE to identify GeV-scale muon neutrinos and anti-neutrinos originating from hadrophilic dark matter annihilation in the Sun, and forecast the sensitivity from contained events. We also map the current bounds from Super-Kamiokande and IceCube on elastic dark matter, as well as the projected limits from Hyper-Kamiokande, to the parameter space of inelastic dark matter. We find that there is a region of parameter space that these neutrino experiments are more sensitive to than the direct-detection experiments. For dark matter annihilation to heavy-quarks, the projected sensitivity of DUNE is weaker than current (future) Super (Hyper) Kamiokande experiments. However, for the light-quark channel, only the spike is observable and DUNE will be the most sensitive experiment.
hep-phastro-ph.COastro-ph.HEJCAP(2024)·17 citations
14*
On the oscillating electric dipole moment induced by axion-fermion couplings
Luca Di Luzio🇮🇹 · Hector Gisbert🇮🇹 · Philip Sørensen🇮🇹
It has been recently claimed that the axion coupling to fermions is responsible for an oscillating electric dipole moment (EDM) in the background of axion dark matter. In this work, we re-examine the derivation of this effect. Contrary to previous studies, we point out the physical relevance of an axion boundary term, which is crucial in restoring the axion shift symmetry and drastically affects the EDM phenomenology. To describe the latter, we introduce the notion of a time-averaged effective axion EDM, which encodes the boundary term and whose magnitude depends on the oscillation regime. For slow oscillations, the boundary term washes out the standard oscillating EDM, resulting in an exact cancellation in the static limit. Conversely, during fast oscillations, the boundary term amplifies the effective EDM relatively to the standard EDM contribution. This observable is especially interesting in the case of the electron EDM. For an $O (1)$ axion-electron coupling, the overall size of the effective EDM in the regime of intermediate or fast oscillations is comparable to the present static EDM limit.
hep-phhep-exJHEP(2024)·11 citations
15*
Forbidden conformal dark matter at a GeV
Steven Ferrante🇺🇸 · Ameen Ismail🇺🇸 · Seung J. Lee🇰🇷 · Yunha Lee🇰🇷
We introduce a model of dark matter (DM) where the DM is a composite of a spontaneously broken conformal field theory. The DM is a thermal relic with its abundance determined by the freeze-out of annihilations to dilatons, the Goldstone boson of broken conformal symmetry. If the dilaton is heavier than the DM this is an example of forbidden DM. We explore the phenomenology of this model in its 5D dual description, corresponding to a warped extra dimension with the Standard Model on the ultraviolet brane and the DM on the infrared brane. We find the model is compatible with theoretical and experimental constraints for DM masses in the $0.1$ - $10$ GeV range. The conformal phase transition is supercooled and strongly first-order. It can source large stochastic gravitational wave signals consistent with those recently observed at pulsar timing arrays like NANOGrav. The majority of the viable parameter space will be probed by future detectors designed to search for long-lived particles, including most of the region favored by the NANOGrav signal. The rest of the parameter space can be probed at future direct detection experiments.
hep-phJHEP(2023)·15 citations
16*
Aspects of Particle Production from Bubble Dynamics at a First Order Phase Transition
Bibhushan Shakya🇩🇪
First order phase transitions (FOPTs) constitute an active area of contemporary research as a promising cosmological source of observable gravitational waves. The spacetime dynamics of the background scalar field undergoing the phase transition can also directly produce quanta of particles that couple to the scalar, which has not been studied as extensively in the literature. This paper provides the first careful examination of various aspects of this phenomenon, which is important for understanding the dynamics of the phase transition, the generation of gravitational waves, and various high energy and beyond the Standard Model phenomena. In particular, the contributions from various stages of FOPTs (bubble nucleation, expansion, collision, post-collision) are disentangled, and conceptual aspects of the associated underlying physics relevant for particle production are clarified. Subtleties related to non-universality of particle interactions and masses in different vacua are discussed, and the suppression of nonperturbative effects such as tachyonic instability and parametric resonance due to the inhomogeneous nature of the process is examined.
hep-phastro-ph.COPRD(2025)·33 citations
17*
Effects of Fragmentation on Post-Inflationary Reheating
Marcos A. G. Garcia🇲🇽 · Mathieu Gross🇫🇷 · Yann Mambrini🇫🇷 · Keith A. Olive🇺🇸 · Mathias Pierre🇩🇪 · Jong-Hyun Yoon🇫🇷
We consider the effects of fragmentation on the post-inflationary epoch of reheating. In simple single field models of inflation, an inflaton condensate undergoes an oscillatory phase once inflationary expansion ends. The equation of state of the condensate depends on the shape of the scalar potential, $V (ϕ)$ , about its minimum. Assuming $V (ϕ) \sim ϕ^{k}$ , the equation of state parameter is given by $w = P_{ϕ} / ρ_{ϕ} = (k - 2) / (k + 2)$ . The evolution of condensate and the reheating process depend on $k$ . For $k \geq 4$ , inflaton self-interactions may lead to the fragmentation of the condensate and alter the reheating process. Indeed, these self-interactions lead to the production of a massless gas of inflaton particles as $w$ relaxes to 1/3. If reheating occurs before fragmentation, the effects of fragmentation are harmless. We find, however, that the effects of fragmentation depend sensitively to the specific reheating process. Reheating through the decays to fermions is largely excluded since perturbative couplings would imply that fragmentation occurs before reheating and in fact could prevent reheating from completion. Reheating through the decays to boson is relatively unaffected by fragmentation and reheating through scatterings results in a lower reheating temperature.
hep-phastro-ph.COgr-qchep-thJCAP(2023)·51 citations
18*
Charmless $B \to P P P$ Decays: the Fully-Antisymmetric Final State
Bhubanjyoti Bhattacharya🇺🇸 · Mirjam Fines-Neuschild🇨🇦 · Andrea Houck🇺🇸 · Maxime Imbeault🇨🇦 · Alexandre Jean🇨🇦 · David London🇨🇦
Under flavor $S U (3)$ symmetry (SU(3) $_{F}$ ), the final-state particles in $B \to P P P$ decays ( $P$ is a pseudoscalar meson) are treated as identical, and the $P P P$ must be in a fully-symmetric (FS) state, a fully-antisymmetric (FA) state, or in one of four mixed states. In this paper, we present the formalism for the FA states. We write the amplitudes for the 22 $B \to P P P$ decays that can be in an FA state in terms of both SU(3) $_{F}$ reduced matrix elements and diagrams. This shows the equivalence of diagrams and SU(3) $_{F}$ . We also give 15 relations among the amplitudes in the SU(3) $_{F}$ limit, as well as the additional four that appear when the diagrams $E$ / $A$ / $P A$ are neglected. We present sets of $B \to P P P$ decays that can be used to extract $γ$ using the FA amplitudes. The value(s) of $γ$ found in this way can be compared with the value(s) found using the FS states.
hep-phhep-exPRD(2024)·6 citations
19*
Multi-component Dark Matter and Small Scale Structure Formation
Robert Wiley Deal🇺🇸 · Kishan Sankharva🇺🇸 · Kuver Sinha🇺🇸 · Scott Watson🇺🇸
We consider the evolution of non-thermal dark matter perturbations in models which contain both Weakly Interacting Massive Particles (WIMPs) and axions. Using constraints from existing observations we examine the percentage of WIMPs and axions that may comprise the cosmological dark matter budget in models with an Early Matter Dominated Epoch (EMDE) -- where entropy production is important. After carefully tracking the thermal evolution of the various species by solving the Boltzmann equations, we consider the enhancement of perturbations that may have led to early structure formation for axions and WIMPs. We investigate the impact of enhanced perturbations on the parameter space of both species, after imposing existing constraints from indirect detection experiments. Given these constraints we establish the feasibility of axions to form miniclusters in the early universe in EMDEs for a given percentage of allowed WIMPs. We find that EMDEs with low reheat temperatures near the BBN limit are preferred for axion minicluster formation. When the EMDE is caused by string moduli, the WIMP contribution to the relic density is set by the moduli branching to dark matter at the level of $≲ O (1 0^{- 4})$ .
hep-phastro-ph.COJHEP(2024)·8 citations
20*
Ab initio uncertainty quantification of neutrinoless double-beta decay in $^{76}$ Ge
A. Belley🇨🇦 · J. M. Yao🇨🇳 · B. Bally🇫🇷 · J. Pitcher🇨🇦 · J. Engel🇺🇸 · H. Hergert🇺🇸 · J. D. Holt🇨🇦 · T. Miyagi🇩🇪 · T. R. Rodriguez🇪🇸 · A. M. Romero🇪🇸 · S. R. Stroberg🇺🇸 · X. Zhang🇨🇳
The observation of neutrinoless double-beta ( $0 ν β β$ ) decay would offer proof of lepton number violation, demonstrating that neutrinos are Majorana particles, while also helping us understand why there is more matter than antimatter in the Universe. If the decay is driven by the exchange of the three known light neutrinos, a discovery would, in addition, link the observed decay rate to the neutrino mass scale through a theoretical quantity known as the nuclear matrix element (NME). Accurate values of the NMEs for all nuclei considered for use in $0 ν β β$ experiments are therefore crucial for designing and interpreting those experiments. Here, we report the first comprehensive ab initio uncertainty quantification of the $0 ν β β$ -decay NME, in the key nucleus $^{76}$ Ge. Our method employs nuclear strong and weak interactions derived within chiral effective field theory and recently developed many-body emulators. Our result, with a conservative treatment of uncertainty, is an NME of $2.6 0_{- 1.36}^{+ 1.28}$ , which, together with the best-existing half-life sensitivity and phase-space factor, sets an upper limit for effective neutrino mass of $18 7_{- 62}^{+ 205}$ meV. The result is important for designing next-generation germanium detectors aiming to cover the entire inverted hierarchy region of neutrino masses.
↳ nucl-thhep-exhep-phnucl-exPRL(2024)·87 citations
21*
Schwinger Pair Production and Vacuum Birefringence around High Magnetized Neutron Stars
Chul Min Kim🇻🇳 · Sang Pyo Kim🇰🇷
Highly magnetized neutron stars have magnetic fields of order of the critical field and can lead to measurable QED effects. We consider the Goldreich-Julian pulsar model with supercritical magnetic fields, induced subcritical electric fields, and a period of milliseconds. We then study the strong field physics, such as Schwinger pair production and the vacuum birefringence including the wrench effect, whose X-ray polarimetry will be observed in future space missions.
↳ astro-ph.HEhep-phAstron.Rep.(2023)·3 citations
22*
Non-linear Black Hole Ringdowns: an Analytical Approach
Davide Perrone🇨🇭 · Thomas Barreira🇫🇷 · Alex Kehagias🇬🇷 · Antonio Riotto🇨🇭
Due to the nature of gravity, non-linear effects are left imprinted in the quasi-normal modes generated in the ringdown phase of the merger of two black holes. We offer an analytical treatment of the quasi-normal modes at second-order in black hole perturbation theory which takes advantage from the fact that the non-linear sources are peaked around the light ring. As a byproduct, we describe why the amplitude of the second-order mode relative to the square of the first-order amplitude depends only weakly on the initial condition of the problem.
↳ gr-qcastro-ph.COhep-phNPB(2024)·58 citations
23*
Fermion Soliton Stars with Asymmetric Vacua
L. Del Grosso🇮🇹 · P. Pani🇮🇹
Fermion soliton stars are a motivated model of exotic compact objects in which a nonlinear self-interacting real scalar field couples to a fermion via a Yukawa term, giving rise to an effective fermion mass that depends on the fluid properties. Here we continue our investigation of this model within General Relativity by considering a scalar potential with generic asymmetric vacua. This case provides fermion soliton stars with a parametrically different scaling of the maximum mass relative to the model parameters, showing that the special case of symmetric vacua, in which we recover our previous results, requires fine tuning. In the more generic case studied here the mass and radius of a fermion soliton star are comparable to those of a neutron star for natural model parameters at the GeV scale. Finally, the asymmetric scalar potential inside the star can provide either a positive or a negative effective cosmological constant in the interior, being thus reminiscent of gravastars or anti-de Sitter bubbles, respectively. In the latter case we find the existence of multiple, disconnected, branches of solutions.
↳ gr-qcastro-ph.COhep-phPRD(2023)·22 citations
24*
The EMC effect for few-nucleon bound systems in Light-Front Hamiltonian Dynamics
Filippo Fornetti🇮🇹 · Emanuele Pace🇮🇹 · Matteo Rinaldi🇮🇹 · Giovanni Salmè🇮🇹 · Sergio Scopetta🇮🇹 · Michele Viviani🇮🇹
The light-front formalism for a covariant description of the European Muon Collaboration (EMC) effect, already applied to $^{3}$ He, is formally extended to any nucleus, and used for actually calculating the $^{3}$ H and $^{4}$ He cases. The realistic and accurate nuclear description of few-nucleon bound systems, obtained with both phenomenological and chiral potentials, has been properly combined with the Poincare' covariance and macroscopic locality, automatically satisfying both number of particles and momentum sum rule. While retaining the on-mass-shell nucleon structure functions, one is then able to predict a sizable EMC effect for $^{4}$ He, as already observed for $^{3}$ He. Moreover, the impact on the EMC effect of both i) the short-range correlations, such as those generated by modern nuclear interactions, and ii) the ratio between the neutron and proton structure functions has been studied. The short-range correlations generated by retaining only the standard nuclear degrees of freedom act on the depth of the minimum in the EMC ratio, while the uncertainties linked to the ratio of neutron to proton structure functions are found to be very small. These light-front results facilitates ascribing deviations from experimental data due to genuine QCD effects, not included in a standard nuclear description, and initiating unbiased investigations.
↳ nucl-thhep-phPLB(2024)·8 citations
25*
Lambda polarization at Electron-ion collider in China
Zhaohuizi Ji🇺🇸 · Xiaoyan Zhao🇨🇳 · Aiqiang Guo🇨🇳 · Qinghua Xu🇨🇳 · Jinlong Zhang🇨🇳
Lambda polarization can be measured through its self-analyzing weak decay, making it an ideal candidate for studying spin effects in high energy scatterings. In lepton-nucleon deeply inelastic scatterings (DIS), Lambda polarization measurements can probe the polarized parton distribution functions (PDFs) and the polarized fragmentation functions (FFs). One of the most promising facilities for high-energy nuclear physics research is the proposed Electron-ion collider in China (EicC). As a next-generation facility, EicC is set to propel our understandings of nuclear physics to new heights. In this article, we study the Lambda production in electron-proton collision at EicC energy, in particular Lambda's reconstruction based on the performance of the designed EicC detector. In addition, taking spontaneous transverse polarization as an example, we provide a theoretical prediction with statistical projection based on one month of EicC data taking, offering valuable insights into future research prospects.
↳ nucl-exhep-phNucl.Sci.Tech.(2023)·10 citations
26*
Axions for amateurs
David J. E. Marsh🇬🇧
Axions are an increasingly popular topic in theoretical physics, and are sparking a global experimental effort. In the following I review the motivations for the existence of axions, the theories underlying them, and the methods to search for them. The target audience is an interested amateur, physics undergraduate, or scientist in another field, and so I use no complicated mathematics or advanced theoretical topics, and instead use lots of analogies.
↳ physics.pop-phhep-phContemp.Phys.(2023)·3 citations
27*
Vortex Creep Heating in Neutron Stars
Motoko Fujiwara🇩🇪 · Koichi Hamaguchi🇯🇵 · Natsumi Nagata🇯🇵 · Maura E. Ramirez-Quezada🇯🇵
Recent observations of old warm neutron stars suggest the presence of a heating source in these stars, requiring a paradigm beyond the standard neutron-star cooling theory. In this work, we study the scenario where this heating is caused by the friction associated with the creep motion of neutron superfluid vortex lines in the crust. As it turns out, the heating luminosity in this scenario is proportional to the time derivative of the angular velocity of the pulsar rotation, and the proportional constant $J$ has an approximately universal value for all neutron stars. This $J$ parameter can be determined from the temperature observation of old neutron stars because the heating luminosity is balanced with the photon emission at late times. We study the latest data of neutron star temperature observation and find that these data indeed give similar values of $J$ , in favor of the assumption that the frictional motion of vortex lines heats these neutron stars. These values turn out to be consistent with the theoretical calculations of the vortex-nuclear interaction.
↳ astro-ph.HEastro-ph.SRhep-phnucl-thJCAP(2024)·12 citations
28*
Lepton-induced reactions on nuclei in a wide kinematical regime
U. Mosel🇩🇪 · K. Gallmeister🇩🇪
Inclusive differential cross sections for various $e A$ and $ν A$ reactions are analyzed within the GiBUU theoretical framework and code. The treatment of electron-nuclus reactions has been significantly improved by implementing a parametrized description of electron-nucleon interactions for a nucleon. Using the momentum of a nucleon inside the Fermi sea the electron-nucleon cross sections are then Lorentz-boosted to obtain the electron structure functions for nuclei. The neutrino structure functions are obtained from the ones for electrons by a transformation that involves the axial formfactors and kinematical factors that account for the difference of vector and axial currents. Special emphasis is put on analyzing data from various different experiments in different neutrino energy regimes with one and the same theoretical input.
↳ nucl-thhep-exhep-phnucl-exPRD(2024)·19 citations
29*
Quantum Electrodynamics Mediated by a Photon with Generalized (Continuous) Spin
Philip Schuster🇺🇸 · Natalia Toro🇺🇸
We present rules for computing scattering amplitudes of charged scalar matter and photons, where the photon has non-zero spin Casimir $ρ$ , and is therefore a continuous spin particle (CSP). The amplitudes reduce to familiar scalar QED when $ρ \to 0$ . As a concrete example, we compute the pair annihilation and Compton scattering amplitudes in this theory and comment on their physical properties, including unitarity and scaling behavior at small and large $ρ$ .
↳ hep-thhep-phPRD(2024)·22 citations
30*
One-loop matching of the $C P$ -odd three-gluon operator to the gradient flow
Òscar L. Crosas🇨🇭 · Christopher J. Monahan🇺🇸 · Matthew D. Rizik🇺🇸 · Andrea Shindler🇩🇪 · Peter Stoffer🇨🇭
The calculation of the neutron electric dipole moment within effective field theories for physics beyond the Standard Model requires non-perturbative hadronic matrix elements of effective operators composed of quark and gluon fields. In order to use input from lattice computations, these matrix elements must be translated from a scheme suitable for lattice QCD to the minimal-subtraction scheme used in the effective-field-theory framework. The accuracy goal in the context of the neutron electric dipole moment necessitates at least a one-loop matching calculation. Here, we provide the one-loop matching coefficients for the $C P$ -odd three-gluon operator between two different minimally subtracted 't Hooft-Veltman schemes and the gradient flow. This completes our program to obtain the one-loop gradient-flow matching coefficients for all $C P$ -violating and flavor-conserving operators in the low-energy effective field theory up to dimension six.
↳ hep-lathep-exhep-phnucl-thPLB(2023)·13 citations
31*
Neutrino anisotropy as a probe of extreme astrophysical accelerators
Marco Stein Muzio🇺🇸 · Noémie Globus🇺🇸
We predict that neutrino sources following the matter distribution of the universe result in an anisotropy in the neutrino sky imprinted by the local large-scale structure. We calculate the level of this anisotropy and explore how it depends on the cosmological evolution of neutrino sources. We show how the level of anisotropy can be amplified when a cutoff in the neutrino spectrum is considered, introducing an effective neutrino horizon. This effect might allow for future neutrino detectors to measure a neutrino anisotropy associated with the local large-scale structure. Measurement of the level of this anisotropy along with features of the neutrino spectrum will allow observers to constrain the cosmological evolution of neutrino sources, which at ultrahigh energies (UHEs) are also expected to be the sources of UHE cosmic rays.
↳ astro-ph.HEhep-phApJ(2025)·1 citation

* 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.