HEP Phenomenology·hep-ph

Tue·Aug 3, 2021Tuesday·August 3, 2021

41 papers—35 primary·6 cross-listed·reconstructed*

01*
Three-loop helicity amplitudes for four-quark scattering in massless QCD
Fabrizio Caola🇬🇧 · Amlan Chakraborty🇺🇸 · Giulio Gambuti🇬🇧 · Andreas von Manteuffel🇺🇸 · Lorenzo Tancredi🇬🇧
We compute the three-loop corrections to the helicity amplitudes for $q q ˉ \to Q Q ˉ$ scattering in massless QCD. In the Lorentz decomposition of the scattering amplitude we avoid evanescent Lorentz structures and map the corresponding form factors directly to the physical helicity amplitudes. We reduce the amplitudes to master integrals and express them in terms of harmonic polylogarithms. The renormalised amplitudes exhibit infrared divergences of dipole and quadrupole type, as predicted by previous work on the infrared structure of multileg scattering amplitudes. We derive the finite remainders and present explicit results for all relevant partonic channels, both for equal and different quark flavours.
hep-phhep-thJHEP(2021)·67 citations
02*
Theory progress at Strange Quark Matter 2021
Bjoern Schenke🇺🇸
I review recent theory progress reported at the 19th International Conference on Strangeness in Quark Matter (SQM), and discuss open questions to be addressed by the coming editions of SQM.
hep-phnucl-thEPJ Web Conf.(2022)·1 citation
03*
$Λ$ polarizing fragmentation function from Belle $e^{+} e^{-}$ data
Umberto D'Alesio🇮🇹 · Francesco Murgia🇮🇹 · Marco Zaccheddu🇮🇹
Experimental data from Belle Collaboration for the transverse polarization of $Λ$ 's measured in $e^{+} e^{-}$ annihilation processes are used to extract the polarizing fragmentation function (FF) within a TMD approach. We consider both associated and inclusive $Λ$ production, showing a quite consistent scenario. Good separation in flavor is obtained, leading to four independent FFs. Predictions for SIDIS processes at the EIC, crucial for understanding their universality and evolution properties, are also presented.
hep-phSciPost Phys.Proc.(2022)·2 citations
04*
Double Exotic States Productions in Pion and Kaon Induced Reactions
Jing Liu🇨🇳 · Dian-Yong Chen🇨🇳 · Jun He🇨🇳
In the present work, we investigate the production of $P_{c}$ and $Z_{c} (3900) / Z_{cs} (3985)$ states in the processes of $π p \to Z_{c} (3900) P_{c}$ / $K p \to Z_{cs} (3985) P_{c}$ with an effective Lagrangian approach. Our estimations indicates that the cross sections depends on the model parameters and beam energies, in particular, the cross sections for $π p \to Z_{c} (3900) P_{c} (4312)$ and $π p \to Z_{c} (3900) P_{c} (4440)$ are similar and can reach up to 10 nb, while those for $π p \to Z_{c} (3900) P_{c} (4457)$ can be 30 nb. As for $K p \to Z_{cs} (3985) P_{c}$ , the cross sections are about 2.5 times smaller than those for $π p \to Z_{c} (3900) P_{c}$ . The discussed processes in the present work, especially $π p \to Z_{c} (3900) P_{c} (4457)$ , may be accessible by the the high-energy pion and kaon beams in the facilities of J-PARC and COMPASS.
hep-phhep-exEPJC(2021)·13 citations
05*
Entropic destruction of heavy quarkonium with hyperscaling violation
Ang Li🇨🇳 · Zi-qiang Zhang🇨🇳
We study the entropic destruction of heavy quarkonium in strongly coupled theories with an anisotropic scaling symmetry in time and spatial direction. We consider Lifshitz and hyperscaling violation theories which are covariant under a generalized Lifshitz scaling symmetry with the dynamical exponent $z$ and hyperscaling violation exponent $θ$ . It is shown that the entropic force depends on the parameters of these theories. In particular, increasing $z$ decreases the entropic force thus reducing the quarkonium dissociation, while increasing $θ$ has opposite effect.
hep-phhep-thCPC(2021)·2 citations
06*
Newly observed exotic doubly charmed meson $T_{cc}^{+}$
S. S. Agaev🇦🇿 · K. Azizi🇮🇷 · H. Sundu🇹🇷
In this work, we treat the newly observed doubly charmed four-quark state $T_{cc}^{+}$ as an axial-vector tetraquark with content $cc u d$ , and calculate its spectroscopic parameters and width. The mass and current coupling of the tetraquark $T_{cc}^{+}$ are found by means of the QCD two-point sum rule method by taking into account quark, gluon and mixed condensates up to dimension $10$ . The width of the $T_{cc}^{+}$ is evaluated using partial widths of decay processes $T_{cc}^{+} \to T π^{0}$ and $T_{cc}^{+} \to T_{cc; u u}^{0} π^{+}$ , where $T = cc u d$ and $T_{cc; u u}^{0}$ are scalar tetraquarks. To compute the partial width of the first process, we apply the QCD three-point sum rule approach and extract numerical value of the strong coupling $g$ that corresponds to the vertex $T_{cc}^{+} T π^{0}$ . The width of the second decay is estimated using isospin symmetry and the prediction obtained for the first channel. Our results for the mass $m = (3868 \pm 124) MeV$ and width $Γ = (489 \pm 92) keV$ of the tetraquark $T_{cc}^{+}$ are in a nice agreement with recent measurements of the LHCb collaboration.
hep-phhep-exhep-latNPB(2022)·92 citations
07*
The axion dark matter echo: a detailed analysis
Ariel Arza🇷🇺 · Elisa Todarello🇩🇪
It was recently shown that a powerful beam of radio/microwave radiation sent out to space can produce detectable back-scattering via the stimulated decay of ambient axion dark matter. This echo is a faint and narrow signal centered at an angular frequency close to half the axion mass. In this article, we provide a detailed analytical and numerical analysis of this signal, considering the effects of the axion velocity distribution as well as the outgoing beam shape. In agreement with the original proposal, we find that the divergence of the outgoing beam does not affect the echo signal, which is only constrained by the axion velocity distribution. Moreover, our findings are relevant for the optimization of the experimental parameters in order to attain maximal signal to noise or minimal energy consumption.
hep-phastro-ph.COhep-exPRD(2022)·19 citations
08*
Study of tetraquarks in dipole-dipole interaction potential
Sindhu D G🇮🇳 · Akhilesh Ranjan🇮🇳
In recent years tetraquark and pentaquark states have received much attention due to the significant experimental findings. In this work masses of some heavy tetraquarks are estimated by considering the spin-spin interaction, the dipole-dipole interaction, and the meson-meson interaction. It is found that such interactions give significant mass contributions. The Regge trajectory of X(3872) state is also studied and is found to be non-linear. Masses of some tetraquark states are also proposed.
hep-phnucl-th1 citation
09*
Sphaleron bound in some nonstandard cosmology scenarios
Ngo Phuc Duc Loc🇻🇳
In the first scenario, we revise the upper bound of the cutoff scale of the dimension-six potential Higgs operator required for a successful electroweak baryogenesis in the case of a modified expansion history caused by the existence of a non-interacting scalar field at the time phase transition happens. The upper bound 860 GeV of the cutoff scale in the conventional case can be improved to 1 TeV in the modified expansion case under certain conditions. In the second scenario, we consider the Randall-Sundrum type II model. We show that the lower bound of the five-dimensional Planck scale in this model, which is determined from the validity of Newtonian gravitational potential at small distance, turns out to be crucial in eliminating this model as a viable candidate to satisfy the sphaleron bound; however, again modifying the expansion history by including a non-interacting scalar field at the electroweak scale can then make this model satisfy the sphaleron bound with a certain parameter space.
hep-phInt.J.Mod.Phys.A(2022)·5 citations
10*
Oscillating scalar dissipating in a medium
Wen-Yuan Ai🇧🇪 · Marco Drewes🇧🇪 · Dražen Glavan🇨🇿 · Jan Hajer🇧🇪
We study how oscillations of a scalar field condensate are damped due to dissipative effects in a thermal medium. Our starting point is a non-linear and non-local condensate equation of motion descending from a 2PI-resummed effective action derived in the Schwinger-Keldysh formalism appropriate for non-equilibrium quantum field theory. We solve this non-local equation by means of multiple-scale perturbation theory appropriate for time-dependent systems, obtaining approximate analytic solutions valid for very long times. The non-linear effects lead to power-law damping of oscillations, that at late times transition to exponentially damped ones characteristic for linear systems. These solutions describe the evolution very well, as we demonstrate numerically in a number of examples. We then approximate the non-local equation of motion by a Markovianised one, resolving the ambiguities appearing in the process, and solve it utilizing the same methods to find the very same leading approximate solution. This comparison justifies the use of Markovian equations at leading order. The standard time-dependent perturbation theory in comparison is not capable of describing the non-linear condensate evolution beyond the early time regime of negligible damping. The macroscopic evolution of the condensate is interpreted in terms of microphysical particle processes. Our results have implications for the quantitative description of the decay of cosmological scalar fields in the early Universe, and may also be applied to other physical systems.
hep-phastro-ph.COhep-thJHEP(2021)·23 citations
11*
QCD factorization for hadronic quarkonium production at high $p_{T}$
Kyle Lee🇺🇸 · Jian-Wei Qiu🇺🇸 · George Sterman🇺🇸 · Kazuhiro Watanabe🇺🇸
Heavy quarkonium production at high transverse momentum ( $p_{T}$ ) in hadronic collisions is explored in the QCD factorization approach. We find that the leading power in the $1/ p_{T}$ expansion is responsible for high $p_{T}$ regime, while the next-to-leading power contribution is necessary for the low $p_{T}$ region. We present the first numerical analysis of the scale evolution of coupled twist-2 and twist-4 fragmentation functions (FFs) for heavy quarkonium production and demonstrate that the QCD factorization approach is capable of describing the $p_{T}$ spectrum of hadronic $J / ψ$ production at the LHC.
hep-phnucl-thSciPost Phys.Proc.(2022)·12 citations
12*
A non-renormalizable neutrino mass model with $S_{3} \otimes Z_{2}$ symmetry
J. D. García-Aguilar🇲🇽 · Juan Carlos Gómez-Izquierdo🇲🇽
The lepton sector is studied within a flavored non-renormalizable model where the $S_{3} \otimes Z_{2}$ flavor symmetry drives the Yukawa couplings. In this framework, the effective neutrino mass, that comes from the type II see-saw mechanism, as well as the charged lepton mass matrices are hierarchical and possessed (under a benchmark in the charged sector) a kind of Fritzsch textures that achieve to accommodate the mixing angles in good agreement with the last experimental data. The model predicts a CP-violating phase consistent with the experimental data and the branching ratio for the lepton flavor violation process, $μ \to e γ$ , is well below the current bound.
hep-phhep-thRev.Mex.Fis.(2022)·5 citations
13*
Constraining CP-phases in SUSY: an interplay of muon/electron $g - 2$ and electron EDM
Song Li🇨🇳 · Yang Xiao🇨🇳 · Jin Min Yang🇨🇳
The minimal supersymmetric standard model (MSSM) with complex parameters can contribute sizably to muon/electron anomalous magnetic dipole momemnt ( $g - 2$ ) and electric dipole moment (EDM). The electron $g - 2$ interplays with electron EDM; the muon $g - 2$ can also interplay with electron EDM assuming the universality between smuon and selectron masses, either of which can constrain the relevant CP-phases in the MSSM. In this work, we first use such an interplay to derive an approximate analytical upper limit on the relevant CP-phase. Then we extensively scan the parameter space to obtain more accurate upper limits. We obtain the following observations: (i) The muon $g - 2$ in the $2 σ$ range combined with the electron EDM upper limit (assuming the universality between smuon and selectron masses) typically constrains the relevant CP-phase under $1.9 \times 1 0^{- 5} (rad)$ ; (ii) The electron $g - 2$ in the $2 σ$ range (Berkeley) interplays with the electron EDM upper limit (without assuming the universality between smuon and selectron masses) constrains the relevant CP-phase under $3.9 \times 1 0^{- 6} (rad)$ (also requiring muon $g - 2$ in the allowed $2 σ$ range). We also find some special cancellations in the parameter space which can relax the constraints by a couple of orders. Such stringent limits on CP-phases may pose a challenge for model building of SUSY, i.e., how to naturally suppress these phases.
hep-phhep-exhep-thNPB(2022)·22 citations
14*
Towards DIS at N4LO
Avanish Basdew-Sharma🇳🇱
We will report on an ongoing effort towards calculating the N4LO perturbative QCD corrections to the DIS total inclusive cross-section. We are developing a method based on differential equations and series expansion in the inverse Bjorken parameter. As a byproduct our calculation should also deliver analytic or at least precise numerical approximations for the four-loop splitting functions.
hep-phSciPost Phys.Proc.(2022)·2 citations
15*
Improved quark coalescence model for spin alignments of vector mesons
Xin-Li Sheng🇨🇳
We propose an improved quark coalescence model for spin alignment of vector mesons by spin density matrix with phase space dependence. Within this model we propose an understanding of spin alignments of vector mesons $ϕ$ and $K^{* 0}$ in the static limit: a large positive deviation of $ρ_{00}$ for $ϕ$ mesons from $1/3$ may come from the electric part of the vector $ϕ$ field, while a negative deviation of $ρ_{00}$ for $K^{* 0}$ mesons may come from the electric part of vorticity fields. In the low- $p_{T}$ region, $ρ_{00}$ for $K^{* 0}$ mesons is proportional to $p_{T}^{2}$ , which is qualitatively agree with experimental results.
hep-phnucl-thEPJ Web Conf.(2022)·0 citations
16*
Effective QCD string and doubly heavy baryons
Joan Soto🇪🇸 · Jaume Tarrús Castellà🇪🇸
Expressions for the potentials appearing in the nonrelativistic effective field theory description of doubly heavy baryons are known in terms of operator insertions in the Wilson loop. However, their evaluation requires nonperturbative techniques, such as lattice QCD, and the relevant calculations are often not available. We propose a parametrization of these potentials with a minimal model dependence based on an interpolation of short- and long-distance descriptions. The short-distance description is obtained from weakly-coupled pNRQCD and the long-distance one is computed using an effective string theory. The effective string theory coincides with the one for pure gluodynamics with the addition of a fermion field constrained to move on the string. We compute the hyperfine contributions to the doubly heavy baryon spectrum. The unknown parameters are obtained from heavy quark-diquark symmetry or fitted to the available lattice QCD determinations of the hyperfine splittings. Using these parameters we compute the double charm and bottom baryon spectrum including the hyperfine contributions. We compare our results with those of other approaches and find that our results are closer to lattice QCD determinations, in particular for the excited states. Furthermore, we compute the vacuum energy in the effective string theory and show that the fermion field contribution produces the running of the string tension and a change of sign in the Lüscher term.
hep-phhep-exhep-latPRD(2021)·28 citations
17*
Cosmic-ray upscattered inelastic dark matter
Nicole F. Bell🇦🇺 · James B. Dent🇺🇸 · Bhaskar Dutta🇺🇸 · Sumit Ghosh🇺🇸 · Jason Kumar🇺🇸 · Jayden L. Newstead🇦🇺 · Ian M. Shoemaker🇺🇸
Light non-relativistic components of the galactic dark matter halo elude direct detection constraints because they lack the kinetic energy to create an observable recoil. However, cosmic-rays can upscatter dark matter to significant energies, giving direct detection experiments access to previously unreachable regions of parameter-space at very low dark matter mass. In this work we extend the cosmic-ray dark matter formalism to models of inelastic dark matter and show that previously inaccessible regions of the mass-splitting parameter space can be probed. Conventional direct detection of non-relativistic halo dark matter is limited to mass splittings of $δ \sim 10 keV$ and is highly mass dependent. We find that including the effect of cosmic-ray upscattering can extend the reach to mass splittings of $δ \sim 100 MeV$ and maintain that reach at much lower dark matter mass.
hep-phastro-ph.HEPRD(2021)·81 citations
18*
QCD phase structure under rotation
Hao-Lei Chen🇨🇳 · Xu-Guang Huang🇨🇳 · Jinfeng Liao🇺🇸
We give an introduction to the phase structure of QCD matter under rotation based on effective four-fermion models. The effects of the magnetic field on the rotating QCD matter are also explored. Recent developments along these directions are overviewed, with special emphasis on the chiral phase transition. The rotational effects on pion condensation and color superconductivity are also discussed.
hep-phhep-thnucl-thLect.Notes Phys.(2021)·32 citations
19*
Entanglement minimization in hadronic scattering with pions
Silas R. Beane🇺🇸 · Roland C. Farrell🇺🇸 · Mira Varma🇺🇸
Recent work arXiv:1812.03138 [nucl-th] conjectured that entanglement is minimized in low-energy hadronic scattering processes. It was shown that the minimization of the entanglement power (EP) of the low-energy baryon-baryon $S$ -matrix implies novel spin-flavor symmetries that are distinct from large- $N_{c}$ QCD predictions and are confirmed by high-precision lattice QCD simulations. Here the conjecture of minimal entanglement is investigated for scattering processes involving pions and nucleons. The EP of the $S$ -matrix is constructed for the $π π$ and $π N$ systems, and the consequences of minimization of entanglement are discussed and compared with large- $N_{c}$ QCD expectations.
hep-phnucl-thquant-phInt.J.Mod.Phys.A(2021)·60 citations
20*
Radiation from matter-antimatter annihilation in the quark nugget model of dark matter
V.V. Flambaum🇦🇺 · I.B. Samsonov🇦🇺
We revisit the properties of positron cloud in quark nugget (QN) model of dark matter (DM). In this model, dark matter particles are represented by compact composite objects composed of a large number of quarks or antiquarks with total baryon number $B \sim 1 0^{24}$ . These particles have a very small number density in our galaxy which makes them "dark" to all DM detection experiments and cosmological observations. In this scenario, anti-quark nuggets play special role because they may manifest themselves in annihilation with visible matter. We study electron-positron annihilation in collisions of free electrons, hydrogen and helium gases with the positron cloud of anti-quark nuggets. We show that a strong electric field of anti-quark nuggets destroys positronium, hydrogen and helium atoms and prevents electrons from penetrating deeply in positron cloud, thus reducing the probability of the electron-positron annihilation by nearly five orders of magnitude. Therefore, electron annihilation in the positron cloud of QNs cannot explain the observed by SPI/INTEGRAL detector photons with energy 511 keV in the center of our galaxy. These photons may be explained by a different mechanism in which QN captures protons which annihilate with anti-quarks in the quark core or transform to neutrons thus reducing the QN core charge and increasing QN temperature. As a result QN loses positrons to space which annihilate with electrons there. Even more positrons are produced from charged pions resulting from the proton annihilation. Another manifestation may be emission of photons from $π^{0}$ decays.
hep-phastro-ph.HEPRD(2021)·17 citations
21*
One-loop Feynman Integral Reduction by Differential Operators
Chang Hu🇨🇳 · Tingfei Li🇨🇳 · Xiaodi Li🇨🇳
For loop integrals, the standard method is reduction. A well-known reduction method for one-loop integrals is the Passarino-Veltman reduction. Inspired by the recent paper [1] where the tadpole reduction coefficients have been solved, in this paper we show the same technique can be used to give a complete integral reduction for any one-loop integrals. The differential operator method is an improved version of the PV-reduction method. Using this method, analytic expressions of all reduction coefficients of the master integrals can be given by algebraic recurrence relation easily. We demonstrate our method explicitly with several examples.
hep-phhep-thPRD(2021)·21 citations
22*
The implications of gamma-ray photons from LHAASO on Lorentz symmetry
Yi Ling🇨🇳 · Yuxuan Liu🇨🇳 · Sai Wang🇨🇳 · Meng-He Wu🇨🇳
The Large High Altitude Air Shower Observatory (LHAASO) has reported the measurement of photons with high energy up to 1.42 PeV from twelve gamma-ray sources. We are concerned with the implications of LHAASO data on the fate of Lorenz symmetry at such high energy level, thus we consider the interaction of the gamma ray with those photons in cosmic microwave background (CMB), and compute the optical depth, the mean free path as well as the survival probability for photons from all these gamma-ray sources. Employing the threshold value predicted by the standard special relativity, it is found that the lowest survival probability for observed gamma ray photons is about 0.60, which is a fairly high value and implies that abundant photons with energy above the threshold value may reach the Earth without Lorentz symmetry violation. We conclude that it is still far to argue that the Lorentz symmetry would be violated due to the present observations from LHAASO.
hep-phastro-ph.HEgr-qcCPC(2022)·2 citations
23*
Discovery of the doubly charmed $T_{cc}^{+}$ state implies a triply charmed $H_{ccc}$ hexaquark state
Tian-Wei Wu🇨🇳 · Ya-Wen Pan🇨🇳 · Ming-Zhu Liu · Si-Qiang Luo🇨🇳 · Xiang Liu · Li-Sheng Geng🇨🇳
The doubly charmed exotic state $T_{cc}$ recently discovered by the LHCb Collaboration could well be a $D D^{*}$ molecular state long predicted in various theoretical models, in particular, the $D D^{*}$ isoscalar axial vector molecular state predicted in the one-boson-exchange model. In this work, we study the $D D D^{*}$ system in the Gaussian Expansion Method with the $D D^{*}$ interaction derived from the one-boson-exchange model and constrained by the precise binding energy of $273 \pm 63$ keV of $T_{cc}$ with respect to the $D^{*+} D^{0}$ threshold. We show the existence of a $D D D^{*}$ state with a binding energy of a few hundred keV and spin-parity $1^{-}$ . Its main decay modes are $D D D π$ and $D D D γ$ . The existence of such a state could in principle be confirmed with the upcoming LHC data and will unambiguously determine the nature of the $T_{cc}^{+}$ state and of the many exotic state of similar kind, thus deepening our understanding of the non-perturbative strong interaction.
hep-phhep-exhep-latPRD(2022)·42 citations
24*
LHC constraints on hidden gravitons
J. A. R. Cembranos🇪🇸 · R. L. Delgado🇪🇸 · H. Villarrubia-Rojo🇨🇭
We analyze LHC data in order to constrain the parameter space of new spin-2 particles universally coupled to the energy-momentum tensor. These new hypothetical particles are the so-called hidden gravitons, whose phenomenology at low energies is determined by two parameters: its mass and its dimensional coupling constant. Hidden gravitons arise in many different extensions of the Standard Model of particles and interactions and General Relativity. Their phenomenology has been studied mainly in relation to modifications of gravity and astrophysical signatures. In this work, we extend the constraints for heavy hidden gravitons, with masses larger than $1$ GeV, by taking into account events collected by ATLAS and CMS in the WW channel, Drell-Yan processes, and the diphoton channel from proton-proton collisions at $s = 8$ TeV.
hep-phgr-qcJHEP(2022)·7 citations
25*
Can we understand the decay width of the $T_{cc}^{+}$ state?
Xi-Zhe Ling🇨🇳 · Ming-Zhu Liu · Li-Sheng Geng🇨🇳 · En Wang🇨🇳 · Ju-Jun Xie🇨🇳
Inspired by the recent discovery of a doubly charmed tetraquark state $T_{cc}^{+}$ by the LHCb Collaboration, we employ the effective Lagrangian approach to investigate the decay width of $T_{cc}^{+} \to D^{+} D^{0} π^{0} / D^{0} D^{0} π^{+}$ and $T_{cc}^{+} \to D^{0} D^{+} γ$ with the assumption that $T_{cc}^{+}$ is an isoscalar $D D^{*}$ molecule. We show that both the $T_{cc} \to D D π$ and $T_{cc} \to D D γ$ modes contribute to the decay width of $T_{cc}$ , with the former being dominant. The resulting total decay width of about $Γ = 63$ keV is smaller than the experimental decay width obtained from the Breit-Wigner fit of the LHCb data, $Γ = 410 \pm 165 \pm 4 3_{- 38}^{+ 18}$ keV, while close to the number obtained from the alternative unitary analysis, $Γ = 48 \pm 2_{- 14}^{+ 0}$ keV, which supports the molecular nature of $T_{cc}$ .
hep-phPLB(2022)·108 citations
26*
Filtered asymmetric dark matter during the Peccei-Quinn phase transition
M. Ahmadvand🇮🇷
In this paper, we propose a bubble filtering-out mechanism for an asymmetric dark matter scenario during the Peccei-Quinn (PQ) phase transition. Based on a QCD axion model, extended by extra chiral neutrinos, we show that the PQ phase transition can be first order in the parameter space of the model and regarding the PQ symmetry breaking scale, the mechanism can generate PeV-scale heavy neutrinos as a dark matter candidate. Considering a CP-violating source, during the phase transition, discriminating between the neutrino and antineutrino number density, we find the observed dark matter relic abundance, such that the setup can be applied to the first order phase transition with different strengths. We then calculate effective couplings of the QCD axion addressing the strong CP problem within the model. We also study the energy density spectrum of gravitational waves generated from the first order phase transition and show that the signals can be detected by future ground-based detectors such as Einstein Telescope. In particular, for a visible heavy axion case of the model, it is shown that gravitational waves can be probed by DECIGO and BBO interferometers. Furthermore, we discuss the dark matter-standard model neutrino annihilation process as a source for the creation of PeV-scale neutrinos.
hep-phastro-ph.COJHEP(2021)·27 citations
27*
QED Mesons, the QED Neutron, and the Dark Matter
Cheuk-Yin Wong🇺🇸
Schwinger's boson solution for massless fermions in QED in 1+1D has been applied and generalized to quarks interacting in QED and QCD interactions, leading to stable and confined open-string QED and QCD boson excitations of the quark-QCD-QED system in 1+1D. Just as the open-string QCD excitations in 1+1D can be the idealization of QCD mesons with a flux tube in 3+1D, so the open-string QED excitations in 1+1D may likewise be the idealization of QED mesons with masses in the tens of MeV region, corresponding possibly to the anomalous X17 and E38 particles observed recently. A further search for bound states of quarks interacting in the QED interaction alone leads to the examination on the stability of the QED neutron, consisting of two $d$ quarks and one $u$ quark. Theoretically, the QED neutron has been found to be stable and estimated to have a mass of 44.5 MeV, whereas the analogous QED proton is unstable, leading to a long-lived QED neutron that may be a good candidate for the dark matter.
hep-phgr-qcnucl-thEPJ Web Conf.(2022)·7 citations
28*
The Secret Higgstory of the Highest Temperature during Reheating
Samuel Passaglia🇯🇵 · Wayne Hu🇺🇸 · Andrew J. Long🇺🇸 · David Zegeye🇺🇸
We study the role of the Standard Model Higgs condensate, formed during cosmological inflation, in the epoch of reheating that follows. We focus on the scenario where the inflaton decays slowly and perturbatively, so that there is a long period between the end of inflation and the beginning of radiation domination. The Higgs condensate decays non-perturbatively during this period, and we show that it heats the primordial plasma to much higher temperatures than would result from the slowly-decaying inflaton alone. We discuss the effect of this hot plasma on the thermalization of the inflaton's decay products, and study its phenomenological implications for the formation of cosmological relics like dark matter, with associated isocurvature fluctuations, and the restoration of the electroweak and Peccei-Quinn symmetries.
hep-phastro-ph.COgr-qchep-thPRD(2021)·21 citations
29*
3D mapping of the effective Majorana neutrino masses with neutrino oscillation data
Ce-ran Hu🇨🇳 · Zhi-zhong Xing🇨🇳
With the help of current neutrino oscillation data, we illustrate the three-dimensional (3D) profiles of all the six distinct effective Majorana neutrino masses $∣ ⟨ m ⟩_{α β} ∣$ (for $α, β = e, μ, τ$ ) with respect to the unknown neutrino mass scale and effective Majorana CP phases. Some salient features of $∣ ⟨ m ⟩_{α β} ∣$ and their phenomenological implications are discussed in both the normal and inverted neutrino mass ordering cases.
hep-phNPB(2021)·6 citations
30*
Quark Sivers Function at Small- $x$ : Leading contribution from the Spin-Dependent Odderon
M. Gabriel Santiago🇺🇸
We present the calculation of the leading contribution to the quark Sivers function at small-Bjorken $x$ . This calculation uses the high energy scattering approximation and operator formalism developed by Kovchegov and Sievert to obtain a dominant contribution to the quark Sivers function coming from the spin-dependent odderon, in agreement with the results of Dong, Zhen, and Zhou. We then calculate this dominant contribution in the diquark model of the proton to obtain a small- $x$ estimate for the Sivers function.
hep-phSciPost Phys.Proc.(2022)·2 citations
31*
Inverse seesaw in $A_{5}^{'}$ modular symmetry
Mitesh Kumar Behera🇮🇳 · Rukmani Mohanta🇮🇳
We make an investigation of modular $Γ_{5}^{'} ≃ A_{5}^{'}$ group in inverse seesaw framework. Modular symmetry is advantageous because it reduces the usage of extra scalar fields significantly. Moreover, the Yukawa couplings are expressed in terms of Dedekind eta functions, which also have a $q$ expansion form, utilized to achieve numerical simplicity. Our proposed model includes six heavy fermion superfields i.e., $N_{R i}$ , $S_{L i}$ and a weighton. The study of neutrino phenomenology becomes simplified and effective by the usage of $A_{5}^{'}$ modular symmetry, which provides us a well defined mass structure for the lepton sector. Here, we observe that all the neutrino oscillation parameters, as well as the effective electron neutrino mass in neutrinoless double beta decay can be accommodated in this model. We also briefly discuss the lepton flavor violating decays $ℓ_{i} \to ℓ_{j} γ$ and comment on non-unitarity of lepton mixing matrix.
hep-phJ.Phys.G(2022)·39 citations
32*
Direct Higgs-top CP-phase measurement with $t t ˉ h$ at the 14 TeV LHC and 100 TeV FCC
Dorival Gonçalves🇺🇸 · Jeong Han Kim🇰🇷 · Kyoungchul Kong🇺🇸 · Yongcheng Wu🇺🇸
The study of the Higgs boson's properties is a cornerstone of the LHC and future collider programs. In this paper, we examine the potential to directly probe the Higgs-top interaction strength and CP-structure in the $t t ˉ h$ channel with the Higgs boson decaying to bottom-quark pairs and top-quarks in the di-leptonic mode. We adopt the BDRS algorithm to tag the boosted Higgs and exploit the $M_{2}$ -assisted reconstruction to compute observables sensitive to the CP-phase at the $t t ˉ$ rest frame, where the new physics sensitivity can be enhanced. Performing a side-band analysis at the LHC to control the continuum $t t ˉ b b ˉ$ background, we find that the Higgs-top strength and CP-phase can be probed up to $δ κ_{t} ≲ 20%$ and $∣ α ∣ ≲ 3 6^{\circ}$ at 95% CL, respectively. We also derive that a similar analysis at a 100 TeV future collider could further improve the precision to $δ κ_{t} ≲ 1%$ and $∣ α ∣ ≲ 1. 5^{\circ}$ , where the CP-odd observables play a crucial role, boosting the sensitivity on the CP-phase.
hep-phJHEP(2022)·40 citations
33*
The impact of top-quark modelling on the exclusion limits in $t t ˉ + DM$ searches at the LHC
Jonathan Hermann🇩🇪 · Malgorzata Worek🇩🇪
New Physics searches at the LHC rely very heavily on the precision and accuracy of Standard Model background predictions. Applying the spin-0 $s$ -channel mediator model, we assess the importance of properly modelling such backgrounds in $t t ˉ$ associated Dark Matter production. Specifically, we discuss higher-order corrections and off-shell effects for the two dominant background processes $t t ˉ$ and $t t ˉ Z$ in the presence of extremely exclusive cuts. Exclusion limits are calculated for state-of-the-art NLO full off-shell $t t ˉ$ and $t t ˉ Z$ predictions and compared to those computed with backgrounds in the NWA and / or at LO. We perform the same comparison for several new-physics sensitive observables and evaluate which of them are affected by the top-quark modelling. Additionally, we make suggestions as to which observables should be used to obtain the most stringent limits assuming integrated luminosities of $300$ fb $^{- 1}$ and $3000$ fb $^{- 1}$ .
hep-phhep-exEPJC(2021)·15 citations
34*
From Models to SMEFT and Back?
Ilaria Brivio🇩🇪 · Sebastian Bruggisser🇩🇪 · Emma Geoffray🇩🇪 · Wolfgang Kilian🇩🇪 · Michael Krämer🇩🇪 · Michel Luchmann🇩🇪 · Tilman Plehn🇩🇪 · Benjamin Summ🇩🇪
We present a global analysis of the Higgs and electroweak sector, in the SMEFT framework and matched to a UV-completion. As the UV-model we use the triplet extension of the electroweak gauge sector. The matching is performed at one loop, employing functional methods. In the SFitter analysis, we pay particular attention to theory uncertainties arising from the matching. Our results highlight the complementarity between SMEFT and model-specific analyses.
hep-phSciPost Phys.(2022)·47 citations
35*
Unbiased interpolated neutron-star EoS at finite T for modified gravity studies
Eva Lope-Oter🇪🇸 · Felipe J. Llanes-Estrada (Univ. Complutense de Madrid)🇪🇸
Neutron stars and their mergers provide the highest-density regime in which Einstein's equations in full (with a matter source) can be tested against modified theories of gravity. But doing so requires a priori knowledge of the Equation of State from nuclear and hadron physics, where no contamination from computations of astrophysics observables within General Relativity has been built in. We extend the nEoS uncertainty bands, useful for this very purpose, to finite (but small) temperatures up to 30 MeV, given that the necessary computations in ChPT and in pQCD at already available in the literature. The temperature-dependent band boundaries will be provided through the COMPOSE repository and our own website.
hep-phgr-qcEPJA(2022)·10 citations
36*
Finite-size scaling around the critical point in the heavy quark region of QCD
Atsushi Kiyohara🇯🇵 · Masakiyo Kitazawa🇯🇵 · Shinji Ejiri🇯🇵 · Kazuyuki Kanaya🇯🇵
Finite-size scaling is investigated in detail around the critical point in the heavy-quark region of nonzero temperature QCD. Numerical simulations are performed with large spatial volumes up to the aspect ratio $N_{s} / N_{t} = 12$ at a fixed lattice spacing with $N_{t} = 4$ . We show that the Binder cumulant and the distribution function of the Polyakov loop follow the finite-size scaling in the $Z (2)$ universality class for large spatial volumes with $N_{s} / N_{t} \geq 9$ , while, for $N_{s} / N_{t} \leq 8$ , the Binder cumulant becomes inconsistent with the $Z (2)$ scaling. To realize the large-volume simulations in the heavy-quark region, we adopt the hopping parameter expansion for the quark determinant: We generate gauge configurations using the leading order action including the Polyakov loop term for $N_{t} = 4$ , and incorporate the next-to-leading order effects in the measurements by the multipoint reweighting method. We find that the use of the leading-order configurations is crucially effective in suppressing the overlapping problem in the reweighting and thus reducing the statistical errors.
↳ hep-lathep-phnucl-thPRD(2021)·38 citations
37*
Inflation and Supersymmetry Breaking in Higgs- $R^{2}$ Supergravity
Shuntaro Aoki🇰🇷 · Hyun Min Lee🇰🇷 · Adriana G. Menkara🇰🇷
We propose a new construction of the supergravity inflation as an UV completion of the Higgs- $R^{2}$ inflation. In the dual description of $R^{2}$ -supergravity, we show that there appear dual chiral superfields containing the scalaron or sigma field in the Starobinsky inflation, which unitarizes the supersymmetric Higgs inflation with a large non-minimal coupling up to the Planck scale. We find that a successful slow-roll inflation is achievable in the Higgs-sigma field space, but under the condition that higher curvature terms are introduced to cure the tachyonic mass problems for spectator singlet scalar fields. We also discuss supersymmetry breaking and its transmission to the visible sector as a result of the couplings of the dual chiral superfields and the non-minimal gravity coupling of the Higgs fields.
↳ hep-thgr-qchep-phJHEP(2021)·7 citations
38*
Nonlinearities of King's plot and their dependence on nuclear radii
Robert A. Müller🇩🇪 · Vladimir A. Yerokhin🇷🇺 · Anton N. Artemyev🇩🇪 · Andrey Surzhykov🇩🇪
Investigations of isotope shifts of atomic spectral lines provide insights into nuclear properties. Deviations from the linear dependence of the isotope shifts of two atomic transitions on nuclear parameters, leading to a nonlinearity of the so-called King plot, are actively studied as a possible way of searching for the new physics. In the present work we calculate the King-plot nonlinearities originating from the Standard-Model atomic theory. The calculation is performed both analytically, for a model example applicable for an arbitrary atom, and numerically, for one-electron ions. It is demonstrated that the Standard-Model predictions of the King-plot nonlinearities are hypersensitive to experimental errors of nuclear charge radii. This effect significantly complicates identifications of possible King-plot nonlinearities originating from the new physics.
↳ physics.atom-phhep-phPRA(2021)·12 citations
39*
Sensitivity to longitudinal vector boson scattering in semileptonic final states at the HL-LHC
Jennifer Roloff🇺🇸 · Viviana Cavaliere🇺🇸 · Marc-André Pleier🇺🇸 · Lailin Xu🇨🇳
Longitudinal vector boson scattering provides an important probe of electroweak symmetry breaking, bringing sensitivity to physics beyond the Standard Model as well as constraining properties of the Higgs boson. It is a difficult process to study due to the small production cross section and challenging separation of the different polarization states. We study the sensitivity to longitudinal $W V$ vector boson scattering at the high-luminosity Large Hadron Collider in semileptonic final states. While these are characterized by larger background contributions compared to fully leptonic final states, they benefit from a higher signal cross section due to the enhanced branching fraction. We determine the polarization through full reconstruction of the event kinematics using the $W$ boson mass constraint and through the use of jet substructure. We show that with these techniques sensitivities around three standard deviations at the HL-LHC are achievable, which makes this channel competitive with its fully leptonic counterparts.
↳ hep-exhep-phPRD(2021)·10 citations
40*
Power-like potentials: from the Bohr-Sommerfeld energies to exact ones
J.C. del Valle🇲🇽 · Alexander V. Turbiner🇲🇽
For one-dimensional power-like potentials $∣ x ∣^{m}, m > 0$ the Bohr-Sommerfeld Energies (BSE) extracted explicitly from the Bohr-Sommerfeld quantization condition are compared with the exact energies. It is shown that for the ground state as well as for all positive parity states the BSE are always above the exact ones contrary to the negative parity states where BSE remain above the exact ones for $m > 2$ but they are below them for $m < 2$ . The ground state BSE as the function of $m$ are of the same order of magnitude as the exact energies for linear $(m = 1)$ , quartic $(m = 4)$ and sextic $(m = 6)$ oscillators but relative deviation grows with $m$ reaching the value 4 at $m = \infty$ . For physically important cases $m = 1, 4, 6$ for the $100$ th excited state BSE coincide with exact ones in 5-6 figures. It is demonstrated that modifying the right-hand-side of the Bohr-Sommerfeld quantization condition by introducing the so-called {\it WKB correction} $γ$ (coming from the sum of higher order WKB terms taken at the exact energies) to the so-called exact WKB condition one can reproduce the exact energies. It is shown that the WKB correction is small, bounded function $∣ γ ∣ < 1/2$ for all $m \geq 1$ , it is slow growing with increase in $m$ for fixed quantum number, while it decays with quantum number growth at fixed $m$ . For the first time for quartic and sextic oscillators the WKB correction and energy spectra (and eigenfunctions) are written explicitly in closed analytic form with high relative accuracy $1 0^{- 9 - 11}$ (and $1 0^{- 6}$ ).
↳ quant-phhep-phhep-thInt.J.Mod.Phys.A(2025)·5 citations
41*
Screened massive expansion of the quark propagator in the Landau gauge
Giorgio Comitini🇮🇹 · Daniele Rizzo🇮🇹 · Massimiliano Battello🇮🇹 · Fabio Siringo🇮🇹
The infrared behavior of the quark propagator is studied at one loop and in the Landau gauge ( $ξ = 0$ ) using the screened massive expansion of full QCD and three different resummation schemes for the quark self-energy. The shift of the expansion point of perturbation theory, which defines the screened expansion, together with a non-standard renormalization of the bare parameters, proves sufficient to describe the dynamical generation of an infrared quark mass also in the chiral limit. Analytically, the scale for such a mass is set by a mass parameter $M$ , whose value is fixed by a fit to the lattice data for quenched QCD. The quark mass function $M (p^{2})$ is shown to be in very good agreement with the lattice results. The quark $Z$ -function, on the other hand, shows the wrong qualitative behavior in all but one of the studied resummation schemes, where its behavior is qualitatively correct, but only at sufficiently high energies.
↳ hep-thhep-lathep-phPRD(2021)·15 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.