HEP Phenomenology·hep-ph

Tue·Feb 14, 2023Tuesday·February 14, 2023

32 papers—21 primary·11 cross-listed·reconstructed*

01*
New Physics hints from $τ$ scalar interactions and $(g - 2)_{e, μ}$
Francisco J. Botella🇪🇸 · Fernando Cornet-Gomez🇺🇸 · Carlos Miró🇪🇸 · Miguel Nebot🇪🇸
We consider a flavour conserving two Higgs doublet model that consists of a type I (or X) quark sector and a generalized lepton sector where the Yukawa couplings of the charged leptons to the new scalars are not proportional to the lepton masses. The model, previously proposed to solve both muon and electron $g - 2$ anomalies simultaneously, is also capable to accommodate the ATLAS excess in $pp \to S \to τ^{+} τ^{-}$ with gluon-gluon fusion production in the invariant mass range [0.2; 0.6] TeV, including all relevant low and high energy constraints. The excess is reproduced taking into account the new contributions from the scalar H, the pseudoscalar A, or both. In particular, detailed numerical analyses favoured the solution with a significant hierarchy among the vevs of the two Higgs doublets, $t_{β} \sim 10$ , and light neutral scalars satisfying $m_{A} > m_{H}$ with sizable couplings to $τ$ leptons. In this region of the parameter space, the muon $g - 2$ anomaly receives one and two loop (Barr-Zee) contributions of similar size, while the electron anomaly is explained at two loops. An analogous ATLAS excess in $b$ -associated production and the CMS excess in ditop production are also studied. Further New Physics prospects concerning the anomalous magnetic moment of the $τ$ lepton and the implications of the CDF $M_{W}$ measurement on the final results are discussed.
hep-phJ.Phys.G(2024)·5 citations
02*
Elementary Particle Physics Vision for EPP2024
Michael E. Peskin🇺🇸
In the fall of 2022, the decadal survey committee on Elementary Particle Physics of the US National Academies requested 2000 word Vision Papers, giving personal interpretations of the results of the Snowmass 2021 study and the future of the field. This is my contribution, which emphasizes the central role of the Higgs boson and its associated mysteries. I encourage the authors of other Vision Papers to make them widely available on the arXiv.
hep-phhep-ex2 citations
03*
Updated analyses of gluon distribution functions for the pion and kaon from the gauge-invariant nonlocal chiral quark model
Parada T. P. Hutauruk🇰🇷 · Seung-il Nam🇰🇷
In this work, we investigate the gluon distribution functions for the pion and kaon, in addition to the improved result of the valence-quark ones, in the gauge-invariant nonlocal chiral-quark model (NL $χ$ QM), in which the momentum dependence of the quark interactions is properly taken into account. We then analyze the gluon distribution functions, generated dynamically through the splitting functions in the DGLAP QCD evolution. By comparing with the recent lattice QCD results and JAM global analyses, it is found that the present numerical results for the gluon parton distribution functions for the pion exhibit a remarkable agreement, followed by the valence up-quark distribution results for the pion by reproducing the reanalyzed experimental data. Our prediction on the gluon distribution functions for the kaon is also consistent with the recent lattice data for the kaon within the errors.
hep-phnucl-thPRD(2024)·9 citations
04*
A concise review on some Higgs-related new physics models in light of current experiments
Lei Wang🇨🇳 · Jin Min Yang🇨🇳 · Yang Zhang🇨🇳 · Pengxuan Zhu🇨🇳 · Rui Zhu🇨🇳
Higgs boson may serve as a portal to new physics beyond the standard model (BSM) which is implied by theoretical naturalness or experimental anomalies. In this note we briefly survey some Higgs-related BSM physics models, including the low energy SUSY (focusing on the minimal SUSY model), the little Higgs models, the two-Higgs-doublet models and the simplest singlet extensions of the Higgs sector. For each illustrated BSM model, we emphatically elucidate its phenomenological power in explaining current measurements of the muon g-2, the W-boson mass and the dark matter. For the singlet extensions like the xSM and 2HDM+S, we discuss the induced cosmic phase transition and the dark matter relic density as well as the vacuum stability. Finally, we give an outlook.
hep-phhep-exUniverse(2023)·20 citations
05*
Configurational entropy and shape complexity of strange vector kaons in AdS/QCD
Roldao da Rocha🇧🇷 · Pedro H. O. Silva🇧🇷
The mass spectrum of strange vector kaons resonances is scrutinized, using AdS/QCD with a deformed dilaton that arises from the constituent quark masses. Both the differential configurational entropy and the differential configurational complexity are computed and used to achieve the mass spectrum of strange vector kaons resonances with higher radial quantum numbers. This approach amalgamates AdS/QCD and the experimental mass spectrum of already detected strange vector kaons in the Particle Data Group, providing a hybrid technique to study the next generation of strange vector kaons resonances.
hep-phhep-thEur.Phys.J.Plus(2023)·5 citations
06*
Gauge invariance of radiative jet functions in the position-space formulation of SCET
Geoffrey T. Bodwin🇺🇸 · June-Haak Ee🇨🇳 · Daekyoung Kang🇨🇳 · Xiang-Peng Wang🇩🇪
In subleading powers of soft-collinear effective theory (SCET), the Lagrangian contains couplings between soft quarks and hard-collinear quarks. Matrix elements of the hard-collinear parts of these couplings are radiative jet functions. In the position-space formulation of SCET, the Lagrangians are constructed from operators that appear to be gauge invariant. Nevertheless, we find violations of gauge invariance arise in the hard-collinear sector because gauge transformations can shift the momentum of a hard-collinear quark field from the hard-collinear sector to the soft sector, where the hard-collinear fields, by definition, have no support. The violations of gauge invariance are manifested in perturbation theory in the hard-collinear sector through the absence of certain Feynman diagrams that would be present in full QCD. A consequence of the absence of these diagrams is that the radiative jet functions that follow directly from the position-space Lagrangians are not gauge invariant, and we demonstrate this through explicit calculations in lower-order perturbation theory. We obtain gauge-invariant Lagrangians by adding to existing position-space Lagrangians terms that are proportional to the soft-quark equation of motion. These gauge-invariant Lagrangians are valid for nonzero, as well as zero, quark masses. We also remark briefly on the gauge invariance of certain Lagrangians that have been constructed in the label-momentum formulation of SCET.
hep-phPRD(2024)·3 citations
07*
Oscillations of Majorana neutrinos in supernova and CP violation
Artem Popov🇷🇺 · Alexander Studenikin🇷🇺
Leptonic CP violation is one of the most important topics in neutrino physics. CP violation in the neutrino sector is strongly related to the nature of neutrinos: whether they are Dirac or Majorana particles. In \cite{Popov:2021icg} we have shown that for Majorana neutrinos arance of nonzero Majorana CP-violating phases combined with strong magnetic field during supernova core-collaple can induce new resonances in neutrino oscillations, for example in $ν_{e} \to ν ˉ_{τ}$ channel. In this contribution we further study new resonances in Majorana neutrino oscillations, in particular energy dependence of amplitudes of these resonances. Our findings suggest a potential astrophysical setup for studying the nature of neutrino masses and leptonic CP violation and may be important for future neutrino experiments, such as JUNO, Hyper-Kamiokande and DUNE.
hep-phPhys.Part.Nucl.Lett.(2024)·3 citations
08*
Regge trajectory relation for the universal description of the heavy-heavy systems: diquarks, mesons, baryons and tetraquarks
Jiao-Kai Chen🇨🇳
By employing the nonlinear Regge trajectory relation $M = m_{R} + β_{x} (x + c_{0 x})^{2/3} (x = l, n_{r})$ , we investigate the heavy-heavy systems, such as the doubly heavy diquarks, the doubly heavy mesons, the heavy-heavy baryons, and the heavy-heavy tetraquarks. The fitted Regge trajectories illustrate that these heavy-heavy systems satisfy the above formula and show the existence of an universal description of the heavy-heavy systems. The universality embodies not only the universal behavior $M \sim x^{2/3}$ but also the universal parameters. The values of $c_{f n_{r}}$ and $c_{f l}$ vary with different heavy-heavy systems, but they are close to one. There is an inequality $β_{n_{r}} > β_{l}$ , and it holds for all the discussed heavy-heavy systems. Moreover, the expression of $β_{x}$ [Eq. (11)] explains its variation with the change of the constituents' masses.
hep-phNPA(2024)·18 citations
09*
The Minimal Flavor Structure of Quarks and Leptons
Ying Zhang🇨🇳
A flavor structure with minimal parameters is proposed to address the fermion mass hierarchy and flavor mixing for quarks and leptons. Yukawa interaction is reconstructed in a new basis to show a homological flat structure for up-type quarks, down-type quarks, charged leptons and Dirac neutrinos. A $S O (2)_{L R}^{f}$ flavor symmetry is found from the hierarchy masses of quarks and leptons, which dominated CKM mixing for quarks and PMNS for leptons. Since the minimal flavor structure successfully addresses CKM and PMNS even in the mass hierarchy limit, mass hierarchy and flavor mixing are two independent questions. As a prediction, a sum rule on the mixing angles and CP violation phase is suggested, which explains the smallness of $s_{13}$ as a natural result of the mass hierarchy. Generalizing the flat structure to quarks and leptons, a unified Yukawa interaction is achieved for all fermions with only a single coupling.
hep-phJ.Phys.G(2023)·6 citations
10*
Gaugino masses from misaligned supersymmetry breaking and R-symmetry breaking spurions
Yunhao Fu🇨🇳 · Tianjun Li🇨🇳 · Longjie Ran🇨🇳 · Zheng Sun🇨🇳
In gauge mediation models with multiple spurion fields breaking SUSY and the R-symmetry separately, we show that it is possible to generate gaugino masses at one loop if the R-charge arrangement satisfies a certain condition. The resulting gaugino masses are calculated and suppressed by some power of the messenger mass scale. We present two simple examples to demonstrate this possibility, and discuss possible phenomenology implications.
hep-phhep-thSymmetry(2023)·3 citations
11*
Weak Mixing Matrix Structures in the Broken Mirror Symmetry Model
Igor T. Dyatlov🇷🇺
A model of symmetry violation is described for a system that can spontaneously choose the left-handed or right-handed character of weak currents. For the hierarchic structure of fermion mass spectra, such a mirror symmetry system allows reproduction of all qualitative properties of weak mixing matrices for both quarks (CKM matrix) and leptons (PMNS matrix),and at that, without additional numerical fitting of model parameters. The hierarchy of CKM matrix elements is directly stipulated by the hierarchical mass spectrum of quark generations. The qualitative properties of the PMNS matrix arise for the inverse character of the neutrino spectrum (m_3 is the smallest mass) and Dirac nature of SM neutrino. The comparatively small value of the neutrino mixing angle theta_13 is a consequence of the smallness of m_3 and the smallness of the charged lepton mass ratio m_e/m_mu.
hep-phPhys.Atom.Nucl.(2023)·0 citations
12*
MeV Gamma-Ray Constraints for Light Dark Matter from Semi-Annihilation
Jun Guo🇨🇳 · Lei Wu🇨🇳 · Bin Zhu🇨🇳
Exploring the realm of Dark Matter research, Light DM, which has a mass in the range of 1 MeV to 1 GeV, is a fascinating topic both theoretically and experimentally. We assume that the light dark matter is composed of complex scalars and produced from semi-annihilation, which is close to the scale of the MeV Gamma-ray satellite, allowing us to explore the implications of this hypothesis. The experimental data we used to constrain the scenario is from five different sources: the COMPTEL, EGRET, INTEGRAL, Fermi Gamma-ray Space Telescope, and the e-ASTROGAM future reach. We use the analytical formula to measure the X-ray spectra allowing us to determine the annihilation cross-section bounds from $1 0^{- 28} cm^{3} / s$ to $1 0^{- 22} cm^{3} / s$ for different combinations of dark matter and mediator masses. We found that the MeV gamma-ray provides valuable insight into the structure of the semi-annihilation dark matter, where EGRET contributes to the stringent constraint to the semi-annihilation, and the e-ASTROGAM future reach could probe the whole parameter space of the model.
hep-phPLB(2023)·16 citations
13*
Implication of cosmological upper bound on the validity of golden ratio neutrino mixings under radiative corrections
Y Monitar Singh🇮🇳 · M Shubhakanta Singh🇮🇳 · N Nimai Singh🇮🇳
We study the implication of the most recent cosmological upper bound on the sum of three neutrino masses, on the validity of the golden ratio (GR) neutrino mixings defined at high energy seesaw scale, considering the possibility for generating low energy values of neutrino oscillation parameters through radiative corrections in the minimal supersymmetric standard model (MSSM). The present study is consistent with the most stringent and latest Planck data on cosmological upper bound, $\sum ∣ m_{i} ∣ < 0.12$ eV. For the radiative generation of sin $θ_{13}$ from an exact form of golden ratio (GR) neutrino mixing matrix defined at high seesaw energy scale, we take opposite CP parity mass eigenvalues ( $m_{1}, - m_{2}, m_{3}$ ) with a non-zero real value of $m_{3}$ , and a larger value of $tan β > 60$ in order to include large effects of radiative corrections in the calculation. The present analysis including the CP violating Dirac phase and SUSY threshold corrections, shows the validity of golden ratio neutrino mixings defined at high seesaw energy scale in the normal hierarchical (NH) model. The numerical analysis with the variations of four parameters viz. $M_{R}$ , $m_{s}$ , $tan β$ and $η_{b} ˉ$ , shows that the best result for the validity is obtained at $M_{R} = 1 0^{15}$ GeV, $m_{s} = 1$ TeV, $tan β = 68$ and $η_{b} ˉ = 0.01$ . However, the analysis based on inverted hierarchical (IH) model does not conform with this latest Planck data on cosmological bound but it still conforms with earlier Planck cosmological upper bound $\sum ∣ m_{i} ∣ < 0.23$ eV, thus indicating possible preference of NH over IH models.
hep-ph0 citations
14*
A Systematic Study on the Resonance in Collisional Neutrino Flavor Instability
Jiabao Liu🇯🇵 · Masamichi Zaizen🇯🇵 · Shoichi Yamada🇯🇵
Investigations on the resonance in the collisional flavor instability (CFI) of neutrinos, which were reported recently, are reported. We show that the resonance occurs not only for the isotropy-preserving modes as pointed out in the previous work but also for the isotropy-breaking modes and that it enhances the growth rate of CFI by orders of magnitude. Employing the linear analysis and nonlinear numerical simulations in the two-flavor scheme and under the relaxation approximation for the collision term, we discuss the criterion for the resonance, its effect on the nonlinear evolution as well as the influences of homogeneity-breaking (k \ne 0) perturbations as well as of anisotropy in the background on the resonance. We will also touch the cohabitation of the resonance with the fast flavor conversion (FFC).
hep-phastro-ph.HEPRD(2023)·52 citations
15*
On the nature of X(3960)
Yu Chen🇺🇸 · Hao Chen🇨🇳 · Ce Meng🇨🇳 · Hong-Rong Qi🇹🇼 · Han-Qing Zheng🇨🇳
A near-threshold enhancement in the $D_{s}^{+} D_{s}^{-}$ system, dubbed as $X (3960)$ , is observed by the LHCb collaboration recently. A combined analysis on $χ_{c 0} (3930) (\to D^{+} D^{-})$ , $X (3960) (\to D_{s}^{+} D_{s}^{-})$ , and $X (3915) (\to J / ψ ω)$ is performed using both a $K$ -matrix approach of $D_{(s)} D ˉ_{(s)}$ four-point contact interactions and a model of Flatté-like parameterizations. The use of the pole counting rule and spectral density function sum rule indicate, under current statistics, that this $D_{s}^{+} D_{s}^{-}$ near-threshold state has probably the mixed nature of a $c c ˉ$ confining state and $D_{s}^{+} D_{s}^{-}$ continuum.
hep-phEPJC(2023)·13 citations
16*
The $f_{ϱ} / m_{ϱ}$ and $f_{π} / m_{ϱ}$ ratios and the conformal window
Hee Sok Chung🇰🇷 · Daniel Nogradi🇭🇺
The $f_{ϱ} / m_{ϱ}$ ratio is calculated at N $^{3}$ LO order within perturbative (p)NRQCD with $N_{f}$ flavors of mass degenerate fermions. The massless limit of the ratio is expanded á la Banks-Zaks in $ϵ = 16.5 - N_{f}$ leading to reliable predictions close to the upper end of the conformal window. The comparison of the NNLO and N $^{3}$ LO results indicate that the Banks-Zaks expansion may be reliable down to twelve flavors. Previous lattice calculations combined with the KSRF relations provide us with the same ratio for the range $2 \leq N_{f} \leq 10$ . Assuming a monotonous dependence on $N_{f}$ leads to an estimate for the lower end of the conformal window, $N_{f}^{*} ≃ 12$ , by matching the non-perturbative and our perturbative results. In any case an abrupt change is observed in $f_{ϱ} / m_{ϱ}$ at twelve flavors. As a cross-check we also consider the $f_{π} / m_{ϱ}$ ratio for which lattice results are also available. The perturbative calculation at present is only at the NNLO level which is insufficient for a reliable and robust matching between the low $N_{f}$ and high $N_{f}$ regions. Nonetheless, using the relative size of the N $^{3}$ LO correction of $f_{ϱ} / m_{ϱ}$ for estimating the same for $f_{π} / m_{ϱ}$ leads to the estimate $N_{f}^{*} ≃ 13$ .
hep-phhep-latPRD(2023)·11 citations
17*
$Z$ boson radiative decays to a $S$ -wave quarkonium at NNLO and NLL accuracy
Wen-Long Sang (SWU)🇨🇳 · De-Shan Yang (UCAS)🇨🇳 · Yu-Dong Zhang (CCNU)🇨🇳
Within the framework of nonrelativistic QCD (NRQCD) factorization formalism, we compute QCD next-to-next-to-leading order (NNLO) corrections to the helicity amplitudes as well as the decay width of $Z \to H + γ$ , where $H$ can be $η_{Q} (Q = c, b), J / ψ$ , or $Υ$ . In addition, we resum the next-to-leading logarithms (NLL) of $m_{Z}^{2} / m_{Q}^{2}$ to all orders of $α_{s}$ for the leading-twist helicity amplitude by employing the light-cone factorization approach. It is worth mentioning that we obtain the analytic expressions of the truncated NLL at $α_{s}^{2}$ . We find that the $O (α_{s})$ corrections are around 10\% for $η_{c}$ and $Υ$ productions, however insignificant for $J / ψ$ and $η_{b}$ productions. The $O (α_{s}^{2})$ corrections are moderate for charmonium production, while very small for bottomonium production. Moreover, it is found that the NLL resummation can considerably alter the NRQCD prediction, especially for $J / ψ$ production. Combining the NRQCD and light-cone computation, we make phenomenological predictions on the decay widths and branching fractions. In addition, we investigate the dependence of the theoretical results on the heavy quark mass, and find the branching fraction of $Z \to H + γ$ monotonically decreases as $m_{Q}$ increases.
hep-phPRD(2023)·13 citations
18*
The Terrestrial Density of Strongly-Coupled Relics
Asher Berlin🇺🇸 · Hongwan Liu🇺🇸 · Maxim Pospelov🇺🇸 · Harikrishnan Ramani🇺🇸
The simplest cosmologies motivate the consideration of dark matter subcomponents that interact significantly with normal matter. Moreover, such strongly-coupled relics may have evaded detection to date if upon encountering the Earth they rapidly thermalize down to terrestrial temperatures, $T_{\oplus} \sim 300 K \sim 25 meV$ , well below the thresholds of most existing dark matter detectors. This shedding of kinetic energy implies a drastic enhancement to the local density, motivating the consideration of alternative detection techniques sensitive to a large density of slowly-moving dark matter particles. In this work, we provide a rigorous semi-analytic derivation of the terrestrial overdensities of strongly-coupled relics, with a particular focus on millicharged particles (MCPs). We go beyond previous studies by incorporating improved estimates of the MCP-atomic scattering cross section, new contributions to the terrestrial density of sub-GeV relics that are independent of Earth's gravitational field, and local modifications that can arise due to the cryogenic environments of precision sensors. We also generalize our analysis in order to estimate the terrestrial density of thermalized MCPs that are produced from the collisions of high-energy cosmic rays and become bound by Earth's electric field.
hep-phhep-exPRD(2024)·19 citations
19*
Automatic Nelson-Barr solutions to the strong CP puzzle
Pavel Fileviez Perez🇺🇸 · Clara Murgui🇺🇸 · Mark B. Wise🇺🇸
We discuss a simple model, based on the gauge group $SU (3)_{C} \otimes SU (2)_{L} \otimes U (1)_{Y} \otimes U (1)_{R}$ , where the Nelson-Barr solution to the strong CP problem is implemented. This model automatically provides a high quality solution to the strong CP puzzle. Weak CP violation in the lepton sector arises in the same fashion as in the quark sector. We derive explicit expressions for the flavor changing couplings of the electroweak and Higgs bosons. These expressions are more general than the particular model considered. Constraints from finite naturalness are briefly discussed. We briefly also discuss related models based on the gauge group B-L.
hep-phPRD(2023)·13 citations
20*
Two-loop bottom mass effects on the Higgs transverse momentum spectrum in top-induced gluon fusion
Piotr Pietrulewicz🇬🇧 · Maximilian Stahlhofen🇩🇪
We compute bottom mass ( $m_{b}$ ) corrections to the transverse momentum ( $q_{T}$ ) spectrum of Higgs bosons produced by gluon fusion in the regime $q_{T} \sim m_{b} ≪ m_{H}$ at leading power in $m_{b} / m_{H}$ and $q_{T} / m_{H}$ , where the gluons couple to the Higgs via a top loop. To this end we calculate the quark mass dependence of the transverse momentum dependent gluon beam functions (aka gluon TMDPDFs) at two loops in the framework of SCET. These functions represent the collinear matrix elements in the factorized gluon-fusion cross section for small $q_{T}$ . We discuss in detail technical subtleties regarding rapidity regulators and zero-bin subtractions in the calculation of the virtual corrections present for massive quarks. Combined with the known soft function for $m_{b} \neq = 0$ our results allow to determine the resummed Higgs $q_{T}$ distribution in the top-induced gluon fusion channel at NNLL $^{'}$ (and eventually N $^{3}$ LL) with full dependence on $m_{b} / q_{T}$ . We perform a first phenomenological analysis at fixed order, where the new corrections to the massless approximation lead to percent-level effects in the peak region of the Higgs $q_{T}$ spectrum. Upon resummation they may thus be relevant for state-of-the-art precision predictions for the LHC.
hep-phhep-exJHEP(2023)·9 citations
21*
$Z_{2}$ -Odd Polonyi Field in Twin Higgs Model
Gongjun Choi🇨🇭 · Keisuke Harigaya🇺🇸
We consider a supersymmetric mirror Twin Higgs model in a gravity-mediated supersymmetry-breaking scenario. We point out that the Polonyi field can be odd under the $Z_{2}$ symmetry exchanging the Standard Model with the mirror sector while gaugino masses are generated at tree-level. We discuss the dynamics of the Polonyi field during and after inflation and show that the Polonyi problem is absent. The Polonyi field couples to the two sectors with opposite signs, which may serve as origin of the $Z_{2}$ -breaking of the Higgs potential in Twin Higgs models. We also estimate the $Z_{2}$ -breaking in soft masses of supersymmetric particles.
hep-phJHEP(2023)·2 citations
22*
PBH formation in EFT of single field inflation with sharp transition
Sayantan Choudhury🇮🇳 · Sudhakar Panda🇮🇳 · M. Sami🇮🇳
Using the Effective Field Theory (EFT) framework of single field inflation, we investigate the possibility of the formation of Primordial Black Holes (PBHs) in the Slow Roll (SR) to Ultra Slow Roll (USR) sharp transition. We demonstrate that, due to one-loop correction to the power spectrum, causality is violated ( $c_{s} > 1$ ) for the mass range of PBHs, $M_{PBH} > 1 0^{2} gm$ created during the said transition. We find that non-canonical features with $c_{s} < 1$ worsen the predictions of the canonical framework of single-field inflation.
↳ astro-ph.COgr-qchep-phhep-thPLB(2023)·129 citations
23*
Dark Matter Searches with Top Quarks
J. Katharina Behr🇩🇪 · Alexander Grohsjean🇩🇪
Collider signatures with top quarks provide sensitive probes of dark matter (DM) production at the Large Hadron Collider (LHC). In this article, we review the results of DM searches in final states with top quarks conducted by the ATLAS and CMS Collaborations at the LHC, including the most recent results on the full LHC Run 2 dataset. We highlight the complementarity of DM searches in final states with top quarks with searches in other final states in the framework of various simplified models of DM. A re-interpretation of a DM search with top quarks in the context of an effective-field theory description of scalar dark energy is also discussed. Finally, we give an outlook on the potential of DM searches with top quarks in LHC Run 3, at the high-luminosity LHC, and possible future colliders. In this context, we highlight new benchmark models that could be probed by existing and future searches as well as those that predict still uncovered signatures of anomalous top-quark production and decays at the LHC.
↳ hep-exhep-phUniverse(2023)·3 citations
24*
Magic Moments: A Collaboration with John Bell
R. A. Bertlmann🇦🇹
I want to give an impression of the time I spent together with John S. Bell, of the atmosphere of our collaboration and friendship. I briefly review our work, the methods of nonrelativistic approximations to quantum field theory for calculating the properties of heavy quark-antiquark bound states.
↳ physics.hist-phhep-phquant-phR.A. Bertlmann and A. Zeilinger (eds.), Q…·0 citations
25*
Back-Reaction of Long-Wavelength Cosmological Fluctuations as Measured by a Clock Field
Vincent Comeau🇨🇦 · Robert Brandenberger🇨🇦
We consider the back-reaction of cosmological fluctuations on the local expansion rate averaged over a space-like hypersurface of constant value of a clock field. We show that in the infrared limit, the fluctuations lead to a decrease in the average expansion rate, measured at a fixed value of the clock field, compared to what would be obtained in a homogeneous universe. We work in the context of Einstein gravity coupled to perfect fluid matter.
↳ gr-qcastro-ph.COhep-phhep-thEPJC(2024)·12 citations
26*
Symmetries of meson correlators in high temperature QCD with physical $(u / d, s, c)$ domain-wall quarks
Ting-Wai Chiu🇹🇼
The correlation function of meson interpolators in $N_{f} = 2 + 1 + 1$ lattice QCD with optimal domain-wall quarks at the physical point are studied for six temperatures in the range $T \sim$ 190-770 MeV. The meson interpolators include a complete set of Dirac bilinears, and each for six combinations of quark flavors. In this paper, we focus on the meson correlators of $u$ and $d$ quarks, and discuss their implications for the effective restoration of $U (1)_{A}$ and $S U (2)_{L} \times S U (2)_{R}$ chiral symmetries, as well as the emergence of the approximate $S U (2)_{C S}$ chiral spin symmetry.
↳ hep-lathep-phPRD(2023)·26 citations
27*
Bottom energy loss and non-prompt $J / ψ$ production in relativistic heavy ion collisions
Meimei Yang🇨🇳 · Shiqi Zheng🇺🇸 · Bo Tong🇨🇳 · Jiaxing Zhao🇫🇷 · Wenyuan Ouyang🇨🇳 · Kai Zhou🇩🇪 · Baoyi Chen🇨🇳
We study the momentum and centrality dependence of the non-prompt $J / ψ$ nuclear modification factors ( $R_{AA}$ ), which comes from the $B$ hadrons decay, in Pb-Pb collisions at the Large Hadron Collider. Bottom quarks are produced in the parton hard scatterings and suffer energy loss in the quark-gluon plasma and the hadronic gas, where the spatial and time evolution of the medium is described with the hydrodynamic equations. Medium-induced elastic scatterings and the radiation in bottom quarks are included in the energy loss of bottom quarks. The hadronization process of bottom quarks is described with the instantaneous coalescence model. After considering both cold and hot nuclear matter effects in Pb-Pb collisions at $s_{N N} = 5.02$ TeV, we calculated the $R_{AA}$ and also the elliptic flows of non-prompt $J / ψ$ from the decay of $B$ mesons at different centralities and transverse momentum bins. The $R_{AA}$ and $v_{2}$ of non-prompt $J / ψ$ sensitive to the hot medium reflect and centrality supply an opportunity to study the bottom quarks energy loss in the hot medium.
↳ nucl-thhep-phPRC(2023)·18 citations
28*
QCD equation of state at finite chemical potential from unbiased exponential resummation of the lattice QCD Taylor series
Sabarnya Mitra🇮🇳 · Prasad Hegde🇮🇳
Exponential resummation of the QCD finite-density Taylor series has been recently introduced as an alternative way of resumming the finite-density lattice QCD Taylor series. Unfortunately the usual exponential resummation formula suffers from stochastic bias which must be subtracted before identifying genuine higher-order contributions. In this paper, we present a new way of subtracting the stochastic bias at the level of each individual gauge configuration, up to a certain order of either the Taylor series or the cumulant expansion, by modifying the argument of the exponential. Retaining the exponential form of the resummation allows us to also calculate the phase factor of the fermion determinant on each gauge configuration. We present our results for the excess pressure, number density, and the average phase factor and show that the new results contain less stochastic bias and are in better agreement with the QCD Taylor series compared to the previous exponential resummation.
↳ hep-lathep-phnucl-exnucl-thPRD(2023)·7 citations
29*
Universality of the Collins-Soper kernel in lattice calculations
Hai-Tao Shu🇩🇪 · Maximilian Schlemmer🇩🇪 · Tobias Sizmann🇩🇪 · Alexey Vladimirov🇪🇸 · Lisa Walter🇩🇪 · Michael Engelhardt🇺🇸 · Andreas Schäfer🇩🇪 · Yi-Bo Yang🇨🇳
The Collins-Soper (CS) kernel is a nonperturbative function that characterizes the rapidity evolution of transverse-momentum-dependent parton distribution functions (TMDPDFs) and wave functions. In this Letter, we calculate the CS kernel for pion and proton targets and for quasi-TMDPDFs of leading and next-to-leading power. The calculations are carried out on the CLS ensemble H101 with dynamical $N_{f} = 2 + 1$ clover-improved Wilson fermions. Our analyses demonstrate the consistency of different lattice extractions of the CS kernel for mesons and baryons, as well as for twist-two and twist-three operators, even though lattice artifacts could be significant. This consistency corroborates the universality of the lattice-determined CS kernel and suggests that a high-precision determination of it is in reach.
↳ hep-lathep-phnucl-thPRD(2023)·47 citations
30*
A dynamical inflaton coupled to strongly interacting matter
Christian Ecker🇩🇪 · Elias Kiritsis🇫🇷 · Wilke van der Schee🇨🇭
According to the inflationary theory of cosmology, most elementary particles in the current universe were created during a period of reheating after inflation. In this work we self-consistently couple the Einstein-inflaton equations to a strongly coupled quantum field theory (QFT) as described by holography. We show that this leads to an inflating universe, a reheating phase and finally a universe dominated by the QFT in thermal equilibrium.
↳ hep-thastro-ph.COgr-qchep-phPRL(2023)·8 citations
31*
Binary boson stars: Merger dynamics and formation of rotating remnant stars
Nils Siemonsen🇨🇦 · William E. East🇨🇦
Scalar boson stars have attracted attention as simple models for exploring the nonlinear dynamics of a large class of ultra compact and black hole mimicking objects. Here, we study the impact of interactions in the scalar matter making up these stars. In particular, we show the pivotal role the scalar phase and vortex structure play during the late inspiral, merger, and post-merger oscillations of a binary boson star, as well as their impact on the properties of the merger remnant. To that end, we construct constraint satisfying binary boson star initial data and numerically evolve the nonlinear set of Einstein-Klein-Gordon equations. We demonstrate that the scalar interactions can significantly affect the inspiral gravitational wave amplitude and phase, and the length of a potential hypermassive phase shortly after merger. If a black hole is formed after merger, we find its spin angular momentum to be consistent with similar binary black hole and binary neutron star merger remnants. Furthermore, we formulate a mapping that approximately predicts the remnant properties of any given binary boson star merger. Guided by this mapping, we use numerical evolutions to explicitly demonstrate, for the first time, that rotating boson stars can form as remnants from the merger of two non-spinning boson stars. We characterize this new formation mechanism and discuss its robustness. Finally, we comment on the implications for rotating Proca stars.
↳ gr-qcastro-ph.HEhep-phPRD(2023)·56 citations
32*
Spin-3/2 and spin-2 charged massive states in a constant electromagnetic background
Karim Benakli🇫🇷 · Cassiano A. Daniel🇧🇷 · Wenqi Ke🇫🇷
We develop in components the superspace action obtained in arXiv:2110.07623 describing the first massive level of the open charged superstring in a flat four-dimensional spacetime. In the absence of an electromagnetic background, we show how the Rarita-Schwinger and Fierz-Pauli Lagrangians are retrieved for spin-3/2 and 2, respectively. We then write different forms of the action in the presence of the electromagnetic background. The resulting equations of motion describe the propagation of fields of charged spin-3/2 and spin-1/2 on the one hand, and spin-2, 1 and 0 on the other.
↳ hep-thhep-phJHEP(2023)·8 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.