Tue·Nov 1, 2022Tuesday·November 1, 2022

1. 01*

   Dark energy based on exotic statistics

   Miguel Hoyuelos🇦🇷 · Pablo Sisterna🇦🇷

   Dark energy is an elusive concept, which has been introduced two decades ago in order to make the acceleration of the universe a comprehensible phenomenon. However, the nature of this energy is far from being understood, both from a fundamental as well as an observational way. In this work we study cosmological consequences of the existence of particles (which we called ``ewkons'' in a previous work) which are quasi distinguishable, obey unorthodox statistics, and have an equation of state similar to many existent dark energy candidates (including negative relation between pressure and energy density). We find an effective scalar field description of this ewkon fluid, and obtain cosmological solutions for the dark energy dominated epoch. This can be considered as a one-parameter class of dark energy models.

   hep-phcond-mat.stat-mechgr-qcInt.J.Mod.Phys.D(2024)·2 citations
2. 02*

   T-even transverse momentum dependent gluon fragmentation functions in a spectator model

   Xiupeng Xie🇨🇳 · Zhun Lu🇨🇳

   We present a model calculation of transverse momentum dependent (TMD) gluon fragmentation functions for the spin-1/2 and spin-0 hadrons. The model is based on the assumption that a time-like off-shell gluon can fragments into a hadron and a single spectator particle. So far such spectator models have only been used to calculate the TMD distribution functions of quark and gluons. The gluon-hadron-spectator coupling is described by an effective vertex containing two form factors. We obtain the analytic expressions for the four T-even TMD fragmentation functions of the gluon. We also present the numerical results for the $z$-dependence and $k_T$-dependence of the fragmentation functions. Our study shows that the effects of these fragmentation functions may be significant and could be probed by future experimental measurements.

   hep-phPLB(2023)·14 citations
3. 03*

   Mass Spectra and Regge Trajectories of $\Delta$ Baryons

   Chandni Menapara🇮🇳 · Chetan Lodha🇮🇳 · Ajay Kumar Rai🇮🇳

   In contrast to past studies, the current paper is focused on baryons, and all four isospin states have been independently generated using u and d quarks with various constituent masses. The hypercentral Constituent Quark Model (hCQM) serves as the theoretical foundation for computing the resonance masses. The spin-dependent and first order correction terms are added to the confining potential, which is assumed to be in linear form. The resulting results have been contrasted with a wide range of methodologies and experimentally practicable states. Regge trajectories for (n,M^2) and (J,M^2) have also been displayed in addition to mass spectra.

   hep-ph1 citation
4. 04*

   Connection between near the $D_s^{+}{D}_s^{-}$ threshold enhancement in $B^{+}\to D_s^{+}{D}_s^{-}{K}^{+}$ and conventional charmonium ${\chi }_{c0}(2P)$

   Dan Guo🇨🇳 · Jun-Zhang Wang🇨🇳 · Dian-Yong Chen🇨🇳 · Xiang Liu🇨🇳

   Focusing on recent measurement of $B^{+}\to D_s^{+}{D}_s^{-}{K}^{+}$ process given by the LHCb Collaboration, we propose that this newly observed near the $D_s^{+}{D}_s^{-}$ threshold enhancement can be due to the contribution of the ${\chi }_{c0}(2P)$, which is a $P$-wave charmonium below the $D_s^{+}{D}_s^{-}$ threshold. By performing a combined fit to the measured $D_s^{+}{D}_s^{-}$, $D_s^{+}{K}^{+}$, and $D_s^{-}{K}^{+}$ invariant mass spectra, introducing the ${\chi }_{c0}(2P)$ can well reproduce the near threshold enhancement in the $D_s^{+}{D}_s^{-}$ invariant mass spectrum. When depicting the whole $D_s^{+}{D}_s^{-}$ invariant mass spectrum, the contributions from higher charmonium $\psi (4230)$ and charmoniumlike state $X_0(4140)$ are obvious. In addition, a charmed meson $D^{\ast }(3^3{S}_1)$ with mass around 3015 MeV is found to be important to depict the $D_s^{-}{K}^{+}$ invariant mass spectrum well. Especially, the importance of node effect of the spatial wave function of the ${\chi }_{c0}(2P)$ is revealed, by which the anomaly of the ratio $\Gamma (X\to D^{+}{D}^{-})/\Gamma (X\to D_s^{+}{D}_s^{-})$ indicated by LHCb can be explained well. Finally, our scenario of the newly observed enhancement structure resulted from the ${\chi }_{c0}(2P)$ is enforced.

   hep-phhep-exPRD(2022)·14 citations
5. 05*

   Heavy quark symmetry of ${\Lambda }_b^0$ decays in quark models

   Jiabao Zhang🇨🇳 · Xiang-Nan Jin🇨🇳 · Chia-Wei Liu🇨🇳 · Chao-Qiang Geng🇨🇳

   We study the heavy quark symmetry with the homogeneous bag model (HBM) and light-front quark model (LFQM) based on the decays of ${\Lambda }_b^0\to {\Lambda }_c^{+}{\ell }^{-}{\overline{\nu }}_{\ell }(\ell =e,\mu ,\tau )$. In particular, we calculate various parameters in the heavy quark expansions, including the Isgur-Wise functions and their first order corrections. The parameters in the HBM are fitted from the mass spectra, while the ones in the LFQM are tightly constrained by the heavy quark symmetry, granting the predictive power of our results. We explicitly obtain that $\mathcal{B}({\Lambda }_b^0\to {\Lambda }_c^{+}{e}^{-}{\overline{\nu }}_e)=(5.69\pm 0.58,5.35\pm 0.50)$, $\mathcal{B}({\Lambda }_b^0\to {\Lambda }_c^{+}{\mu }^{-}{\overline{\nu }}_{\mu })=(5.67\pm 0.58$, $5.33\pm 0.49)$, and $\Gamma ({\Lambda }_b^0\to {\Lambda }_c^{+}{\tau }^{-}{\overline{\nu }}_{\tau })/\Gamma ({\Lambda }_b^0\to {\Lambda }_c^{+}{\mu }^{-}{\overline{\nu }}_{\mu })=(0.3243\pm 0.0126$, $0.3506\pm 0.0046)$ for the numerical values of (HBM, LFQM). Our results of the branching fractions in both models agree well with the experimental data and lattice QCD calculations. In addition, we find that the hard gluon corrections decrease the branching fractions around $10\%$.

   hep-phhep-exPRD(2023)·9 citations
6. 06*

   Branching probabilities in TMD Monte Carlo algorithms

   Lissa Keersmaekers🇧🇪

   We discuss a recently proposed branching algorithm which incorporates transverse momentum dependent (TMD) parton splitting probabilities, and can be used for Monte Carlo event generators based on TMD distributions.

   hep-phPoS(2022)·0 citations
7. 07*

   CP Violation and Mixing in Beauty Sector: A Theoretical Overview

   Eleftheria Malami🇳🇱

   We provide an overview of the latest progress in the study of CP violation and mixing in the $B$ meson decays. Studying the $B_d^0\to J/\psi K_S^0$ and $B_s^0\to J/\psi \varphi$ decays, we focus on the determination of the mixing phases ${\varphi }_d$ and ${\varphi }_s$, including hadronic uncertainties with the help of the data. CP violation in the non-leptonic decays $B\to \pi K$ and $B_s^0\to D_s^{\mp }{K}^{\pm }$ indicate puzzling patterns. Could these puzzles indicate New Physics?

   hep-phhep-exPoS(2023)·2 citations
8. 08*

   Search for heavy Majorana neutrinos in the $\tau$ final state at proton-electron colliders

   Haiyong Gu🇨🇳 · Ying-nan Mao🇨🇳 · Hao Sun🇨🇳 · Kechen Wang🇨🇳

   We utilize the lepton number violation signal process $p{e}^{-}\to {\tau }^{+}jjj$ to search for heavy Majorana neutrinos at future proton-electron colliders. The LHeC (FCC-eh) is considered to run with an electron beam energy of 60 GeV, a proton beam energy of 7 (50) TeV and an integrated luminosity of 1 (3) ab${}^{-1}$, and the electron beam is considered to be unpolarized. We apply detector configurations and simulate signal and related standard model background events for both hadronic ${\tau }_h$ and leptonic ${\tau }_{\ell }$ final states, $\ell$ being a muon. After preselection, multivariate analyses are performed to reject the background. The strategy to reconstruct the heavy neutrino mass is developed and distributions of reconstructed mass are presented. Discovery sensitivities on parameter $|V_{\tau N}{|}^2|V_{eN}{|}^2/(|V_{\tau N}{|}^2+|V_{eN}{|}^2)$ for the heavy neutrino mass between 10 and 3000 GeV are predicted. At the 2-$\sigma$ significance, the best discovery sensitivity is $\sim 1.2\times 10^{-5}(5.0\times 10^{-6})$ at the LHeC (FCC-eh) when $m_N\sim 100$ GeV for the hadronic ${\tau }_h$ final state. Sensitivities for the leptonic ${\tau }_{\ell }$ final state are found to be similar to those for the hadronic ${\tau }_h$ final state for most of the parameter space investigated. We also derive the limits on mixing parameters from electroweak precision data (EWPD) and DELPHI experiment. Assuming $|V_{\tau N}{|}^2=|V_{eN}{|}^2=|V_{\ell N}{|}^2$, sensitivity bounds from the LHeC and FCC-eh experiments are found to be stronger than those from EWPD when $m_N\lesssim 900$ GeV, and also stronger than those from DELPHI when $m_N\gtrsim 70$ GeV. Constraints are also interpreted and compared in the $|V_{\tau N}{|}^2$ vs. $|V_{eN}{|}^2$ plane.

   hep-phhep-exJHEP(2023)·9 citations
9. 09*

   Distinguishing Dirac and Majorana Heavy Neutrinos at Lepton Colliders

   Marco Drewes🇧🇪

   We discuss the potential to observe lepton number violation (LNV) in displaced vertex searches for heavy neutral leptons (HNLs) at future lepton colliders. Even though a direct detection of LNV is impossible for the dominant production channel because lepton number is carried away by an unobservable neutrino, there are several signatures of LNV that can be searched for. They include the angular distribution and spectrum of decay products as well as the HNL lifetime. We comment on the perspectives to observe LNV in realistic neutrino mass models and argue that the dichotomy of Dirac vs Majorana HNLs is in general not sufficient to effectively capture their phenomenology, but these extreme cases nevertheless represent well-defined benchmarks for experimental searches. Finally, we present accurate analytic estimates for the number of events and sensitivity regions during the $Z$-pole run for both Majorana and Dirac HNLs.

   hep-phhep-exPoS(2022)·35 citations
10. 10*

    Light meson emissions of the selected charmonium-like states within compact tetraquark configurations

    Ning Li🇨🇳 · Hui-Zhen He🇨🇳 · Wei Liang🇨🇳 · Qi-Fang Lü🇨🇳 · Dian-Yong Chen🇨🇳 · Yu-Bing Dong🇨🇳

    We adopt the quark pair creation model to investigate the light meson emissions of several charmonium-like states. The quark pair creation model is applied to the four-body systems, and we calculate the pion/kaon emissions of the $X(4700)$, $Z_c(4430)$, $Y(4230)$, $Y(4360)$, $Y(4390)$ and $Y(4660)$ within the compact tetraquark assumptions. It is found that the pion/kaon decay widths for the $X(4700)$ and $Z_c(4430)$ are relatively small, while the partial decay widths for the resonances $Y(4230)$, $Y(4360)$, $Y(4390)$ and $Y(4660)$ are significant. We expect that our exploration of these decay behaviors can provide useful information for future experimental searches and theoretical interpretations.

    hep-phhep-exCPC(2023)·4 citations
11. 11*

    Lepton pair production at NNLO in QED with EW effects

    Sophie Kollatzsch🇩🇪 · Yannick Ulrich🇬🇧

    We present a fully differential calculation of lepton pair production, taking into account the dominant next-to-next-to-leading order QED corrections as well as next-to-leading order electroweak and polarisation effects. We include all lepton masses, hard photon emission, as well as non-perturbative hadronic corrections. The corresponding matrix elements are implemented in the Monte Carlo framework McMule. In order to obtain a numerically stable implementation, we extend next-to-soft stabilisation, a universal technique based on a next-to-leading-power expansion, to calculations with polarised leptons. As an example, we show results tailored to the Belle II detector with the current setup as well as a potential future configuration that includes polarised beams.

    hep-phhep-exSciPost Phys.(2023)·18 citations
12. 12*

    ${\Lambda }_c(2910)$ and ${\Lambda }_c(2940)$ as the conventional baryons dressed with the $D^{\ast }N$ channel

    Zi-Le Zhang🇨🇳 · Zhan-Wei Liu🇨🇳 · Si-Qiang Luo🇨🇳 · Fu-Lai Wang🇨🇳 · Bo Wang🇨🇳 · Hao Xu🇨🇳

    In this work, we treat ${\Lambda }_c(2910{)}^{+}$ and ${\Lambda }_c(2940{)}^{+}$ as the conventional $udc$ cores dressed with the $D^{\ast }N$ channel. We provide a possible interpretation to both ${\Lambda }_c(2910{)}^{+}$ and ${\Lambda }_c(2940{)}^{+}$ within the same framework. In the study, we consider not only the effects between the conventional triquark core and the $D^{\ast }N$ channel but also the $D^{\ast }N$-$D^{\ast }N$ interactions. The mass of ${\Lambda }_c$ state with $J^P=1/2^{-}$ is larger than that with $J^P=3/2^{-}$ in this unquenched picture, which is very different from the prediction of the conventional quenched quark model. Based on the mass spectrum, the spin-parity of ${\Lambda }_c(2940{)}^{+}$ is more likely to be $1/2^{-}$ while ${\Lambda }_c(2910{)}^{+}$ prefers $3/2^{-}$. We look forward to the future experiments can test our results with more precise experimental data.

    hep-phhep-exPRD(2023)·25 citations
13. 13*

    Higher twists effects in DIS on nuclei at the EIC and LHeC: A phenomenological analysis

    Yan B. Bandeira🇧🇷 · Victor P. Goncalves🇧🇷

    In this paper we investigate the impact of the higher - twist effects, resummed by the non - linear approaches for the QCD dynamics, on the inclusive observables that will be measured in future electron - ion colliders. We assume a phenomenological model for the dipole - nucleus scattering amplitude which takes into account the non - linear corrections and estimate the contribution of the different twists for $F_2^A(x,Q^2)$, $F_L^A(x,Q^2)$ and $\partial F_2^A/\partial ln{Q}^2$ considering different values of the Bjorken - $x$ variable, photon virtuality $Q^2$ and atomic number $A$. A comparison with the full predictions is performed and the impact of the distinct twists is estimated. Our results indicate that a future analysis of the logarithmic $Q^2$ slope and longitudinal structure function will allow us to probe the presence of the non - linear effects on the QCD dynamics.

    hep-phnucl-thEPJA(2023)·3 citations
14. 14*

    Inclusive production of $J/\psi$, $\psi (2S)$, and ${\rm Y}$ states in pNRQCD

    Nora Brambilla🇩🇪 · Hee Sok Chung🇩🇪 · Antonio Vairo🇩🇪 · Xiang-Peng Wang🇩🇪

    Under some assumptions on the hierarchy of relevant energy scales, we compute the nonrelativistic QCD (NRQCD) long-distance matrix elements (LDMEs) for inclusive production of $J/\psi$, $\psi (2S)$, and ${\rm Y}$ states based on the potential NRQCD (pNRQCD) effective field theory. Based on the pNRQCD formalism, we obtain expressions for the LDMEs in terms of the quarkonium wavefunctions at the origin and universal gluonic correlators, which do not depend on the heavy quark flavor or the radial excitation. This greatly reduces the number of nonperturbative unknowns and substantially enhances the predictive power of the nonrelativistic effective field theory formalism. We obtain improved determinations of the LDMEs for $J/\psi$, $\psi (2S)$, and ${\rm Y}$ states thanks to the universality of the gluonic correlators, and obtain phenomenological results for cross sections and polarizations at large transverse momentum that agree well with measurements at the LHC.

    hep-phhep-exhep-latnucl-thJHEP(2023)·39 citations
15. 15*

    Parametrizations of collinear and k_T-dependent parton densities in a proton

    N.A. Abdulov🇷🇺 · A.V. Kotikov🇷🇺 · A.V.Lipatov🇷🇺

    A new type of parametrization for parton distribution functions in a proton, based on their $Q^2$-evolution at large and small $x$ values, is constructed. In our analysis, the valence and nonsinglet parts obey the Gross-Llewellyn-Smith and Gottfried sum rules, respectively. For the singlet quark and gluon densities momentum conservation is taken into account. Then, using the Kimber-Martin-Ryskin prescription, we extend the consideration to Transverse Momentum Dependent (TMD, or unintegrated) gluon and quark distributions in a proton, which currently plays an important role in a number of phenomenological applications. The analytical expressions for the latter, valid for both low and large $x$, are derived for the first time.

    hep-phParticles(2022)·11 citations
16. 16*

    Long-lived heavy neutral leptons with a displaced shower signature at CMS

    Giovanna Cottin🇨🇱 · Juan Carlos Helo🇨🇱 · Martin Hirsch🇪🇸 · Cristián Peña🇺🇸 · Christina Wang🇺🇸 · Si Xie🇺🇸

    We study the LHC discovery potential in the search for heavy neutral leptons (HNL) with a new signature: a displaced shower in the CMS muon detector, giving rise to a large cluster of hits forming a displaced shower. A new Delphes module is used to model the CMS detector response for such displaced decays. We reinterpret a dedicated CMS search for neutral long-lived particles decaying in the CMS muon endcap detectors for the minimal HNL scenario. We demonstrate that this new strategy is particularly sensitive to active-sterile mixings with $\tau$ leptons, due to hadronic $\tau$ decays. HNL masses between $\sim 1-6$ GeV can be accessed for mixings as low as $|V_{\tau N}{|}^2\sim 10^{-7}$, probing unique regions of parameter space in the $\tau$ sector.

    hep-phhep-exJHEP(2023)·31 citations
17. 17*

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

    Simon Badger🇮🇹 · Matteo Becchetti🇮🇹 · Ekta Chaubey🇮🇹 · Robin Marzucca🇩🇰

    We consider the case of a two-loop five-point pentagon-box integral configuration with one internal massive propagator that contributes to top-quark pair production in association with a jet at hadron colliders. We construct the system of differential equations for all the master integrals in a canonical form where the analytic form is reconstructed from numerical evaluations over finite fields. We find that the system can be represented as a sum of d-logarithmic forms using an alphabet of 71 letters. Using high precision boundary values obtained via the auxiliary mass flow method, a numerical solution to the master integrals is provided using generalised power series expansions.

    hep-phhep-thJHEP(2023)·35 citations
18. 18*

    Threshold enhanced cross sections for colorless productions

    Goutam Das🇩🇪 · Chinmoy Dey🇮🇳 · M. C. Kumar🇮🇳 · Kajal Samanta🇨🇳

    We study the threshold effect for neutral and charged Drell-Yan productions, associated production of Higgs boson with a massive vector boson and Higgs production in bottom quark annihilation at LHC to the third order in QCD. Using the third order soft-virtual results for these processes and exploiting the universality of the threshold logarithms, we extract the process-dependent coefficients for these processes and resum large threshold logarithms to next-to-next-to-next-to leading logarithmic (N${}^3$LL) accuracy. By matching our results to the recently available N${}^3$LO results, we provide the most precise theoretical predictions for these processes. We present numerical results for invariant mass distribution and total production cross-sections. We find the conventional scale uncertainties of about $0.4\%$ at N${}^3$LO level in the fixed order results get reduced to as small as less than $0.1\%$ at N${}^3$LO+N${}^3$LL level in the high invariant mass region.

    hep-phPRD(2023)·16 citations
19. 19*

    Searching for axion forces with precision precession in storage rings

    Prateek Agrawal🇬🇧 · David E. Kaplan🇺🇸 · On Kim🇺🇸 · Surjeet Rajendran🇺🇸 · Mario Reig🇬🇧

    We consider different types of storage rings as precision probes of axion-mediated monopole-dipole forces. We show that current and planned experiments aiming to measure magnetic and electric dipole moments of protons, muons and electrons very precisely may explore new parts of the parameter space beyond existing laboratory bounds and, in some cases, beyond astrophysical constraints. Remarkably, a light axion coupled to muons may explain the FNAL/BNL $(g-2{)}_{\mu }$ anomaly as an environmental effect -- the coherent axion field generated by the earth nucleons induces an extra contribution to the anomalous precession frequency of the muon explaining the discrepancy with respect to the SM prediction.

    hep-phhep-exPRD(2023)·31 citations
20. 20*

    Detecting axion dark matter beyond the magnetoquasistatic approximation

    Joshua N. Benabou🇺🇸 · Joshua W. Foster🇺🇸 · Yonatan Kahn🇺🇸 · Benjamin R. Safdi🇺🇸 · Chiara P. Salemi🇺🇸

    A number of proposals have been put forward for detecting axion dark matter (DM) with grand unification scale decay constants that rely on the conversion of coherent DM axions to oscillating magnetic fields in the presence of static, laboratory magnetic fields. Crucially, such experiments $–$ including ABRACADABRA $–$ have to-date worked in the limit that the axion Compton wavelength is larger than the size of the experiment, which allows one to take a magnetoquasistatic (MQS) approach to modeling the axion signal. We use finite element methods to solve the coupled axion-electromagnetism equations of motion without assuming the MQS approximation. We show that the MQS approximation becomes a poor approximation at frequencies two orders of magnitude lower than the naive MQS limit. Radiation losses diminish the quality factor of an otherwise high-$Q$ resonant readout circuit, though this may be mitigated through shielding and minimizing lossy materials. Additionally, self-resonances associated with the detector geometry change the reactive properties of the pickup system, leading to two generic features beyond MQS: there are frequencies that require an inductive rather than capacitive tuning to maintain resonance, and the detector itself becomes a multi-pole resonator at high frequencies. Accounting for these features, competitive sensitivity to the axion-photon coupling may be extended well beyond the naive MQS limit.

    hep-phastro-ph.COhep-exPRD(2023)·17 citations
21. 21*

    MB Tools reloaded

    A.V. Belitsky🇺🇸 · A.V. Smirnov🇷🇺 · V.A. Smirnov🇷🇺

    We address the problem of evaluation of multiloop Feynman integrals by means of their Mellin-Barnes representation. After a brief overview of available capabilities though open source toolkits and their application in various circumstances, we introduce a new code MBcreate which allows one to automatically deduce a concise Mellin-Barnes representation for a given parametric integral. A thorough discussion of its implementation and use is provided.

    hep-phhep-thNPB(2023)·28 citations
22. 22*

    Chasing the two-Higgs doublet model in the di-Higgs production

    Syuhei Iguro🇩🇪 · Teppei Kitahara🇯🇵 · Yuji Omura🇯🇵 · Hantian Zhang🇩🇪

    We investigate the di-Higgs production at the Large Hadron Collider in the two-Higgs doublet model (2HDM). In particular, we study the production of an extra neutral Higgs boson $\varphi$ in association with the Standard Model (SM) Higgs boson $h$ in the Higgs alignment limit. We analyze two scenarios where the additional Higgs $\varphi$ is CP-even or -odd state with a large top-Yukawa interaction. The leading contribution of this production comes from the top-quark loop-induced gluon-fusion channel $gg\to h\varphi$. The measurement of the $h\varphi$ production can probe the quartic couplings in the Higgs potential as well as the top-Yukawa couplings. Imposing both theoretical constraints (from the perturbative unitarity and the vacuum stability bounds) and experimental bounds (from the SM Higgs and flavor physics measurements) on the 2HDM parameter space, we calculate the production cross-section of $gg\to h\varphi$. Furthermore, we scrutinize these processes in the parameter spaces where the CMS di-tau and di-photon excesses around 100GeV, and/or the muon $g-2$ anomaly can be accommodated.

    hep-phhep-exPRD(2023)·29 citations
23. 23*

    Q-balls in polynomial potentials

    Julian Heeck🇺🇸 · Mikheil Sokhashvili🇺🇸

    Bosons carrying a conserved charge can form stable bound states if their Lagrangian contains attractive self-interactions. Bound-state configurations with a large charge $Q$ can be described classically and are denoted as Q-balls, their properties encoded in a non-linear differential equation. Here, we study Q-balls in arbitrary polynomial single-scalar-field potentials both numerically and via various analytical approximations. We highlight some surprising universal features of Q-balls that barely depend on the details of the potential. The polynomial potentials studied here can be realized in renormalizable models involving additional heavy or light scalars, as we illustrate with several examples.

    hep-phhep-thPRD(2023)·19 citations
24. 24*

    $A^{\prime }$ view of the sunrise: Boosting helioscopes with angular information

    Jonas Frerick🇩🇪 · Felix Kahlhoefer🇩🇪 · Kai Schmidt-Hoberg🇩🇪

    The Sun may copiously produce hypothetical light particles such as axions or dark photons, a scenario which can be experimentally probed with so-called helioscopes. Here we investigate the impact of the angular and spectral distribution of solar dark photons on the sensitivity of such instruments. For the first time we evaluate this spectral and angular dependence of the dark photon flux over the whole mass range and apply this information to existing data from the Hinode Solar X-Ray Telescope. Specifically we use calibration images for a classical helioscope analysis as well as data from a solar eclipse providing sensitivity to exceptionally large oscillation lengths. We demonstrate that exploiting the signal features can boost the constraints by more than one order of magnitude in terms of the mixing parameter compared to a naive counting experiment.

    hep-phastro-ph.SRJCAP(2023)·11 citations
25. 25*

    Cosmic Ray Antihelium from a Strongly Coupled Dark Sector

    Martin Wolfgang Winkler🇺🇸 · Pedro De La Torre Luque🇸🇪 · Tim Linden🇸🇪

    Standard Model extensions with a strongly coupled dark sector can induce high-multiplicity states of soft quarks. Such final states trigger extremely efficient antinucleus formation. We show that dark matter annihilation or decay into a strongly coupled sector can dramatically enhance the cosmic-ray antinuclei flux -- by six orders of magnitude in the case of ${}^4\overline{\text{He}}$. In this work, we argue that the tentative ${}^3\overline{\text{He}}$ and ${}^4\overline{\text{He}}$ events reported by the AMS-02 collaboration could be the first sign of a strongly coupled dark sector observed in nature.

    hep-phastro-ph.HEPRD(2023)·15 citations
26. 26*

    The Width of a Beta-decay-induced Antineutrino Wavepacket

    B.J.P. Jones🇺🇸 · E. Marzec🇺🇸 · J. Spitz🇺🇸

    The time evolution of a neutrino is dependent on its initial properties at creation including flavor, energy, and wavepacket size. There exists no solid theoretical prediction for the latter property in the context of nuclear beta decay, despite the importance of this process for the past, present, and future of neutrino experimentation. In this paper, we provide a quantitative prediction for the size of a beta-decay-induced electron antineutrino wavepacket by treating the parent nucleus decaying to an entangled antineutrino-recoil system using the formalism of open quantum systems. Of central importance is the delocalization scale of the parent particle. We construct a systematic description of the hierarchy of localizing entanglements that provides an unambiguous statement of the relevant localization scale, found to be closely related to the diameter of the parent nucleus (e.g. $\sim$5-6~fm for beta-decaying fission daughters) and as low as the typical nucleon-nucleon correlation distance ($\sim$1~fm). Inside a nuclear reactor, for example, this translates to initial electron antineutrino wavepacket widths in the ${\sigma }_{\nu ,x}\sim 10-400$~pm range for $E_{{\overline{\nu }}_e}>1.8$~MeV, with dependencies on decaying nucleus size, the emitted antineutrino energy, and the kinematics of the recoiling system. Wavepacket sizes in this envelope do not produce an observable effect on oscillation probability in foreseeable reactor experiments in the standard three-neutrino model, including JUNO which is expected to be sensitive to ${\sigma }_{\nu ,x}\lesssim 3$~pm.

    hep-phhep-exnucl-thPRD(2023)·22 citations
27. 27*

    Scalar-singlet assisted leptogenesis with CP violation from the vacuum

    D. M. Barreiros🇵🇹 · H. B. Câmara🇵🇹 · R. G. Felipe🇵🇹 · F. R. Joaquim🇵🇹

    In the vanilla type-I seesaw leptogenesis scenario, CP violation required to generate the lepton asymmetries in the heavy Majorana neutrino decays stem from complex Dirac-type Yukawa couplings. In this paper we explore the case in which that CP violation originates from the vacuum expectation value of a complex scalar singlet at a very high scale. This non-trivial CP-violating phase can be successfully communicated to the low-energy neutrino sector via the heavy neutrino portal. The new scalar-singlet degrees of freedom generate new contributions to the CP asymmetries relevant for leptogenesis not only at the one-loop level but also through tree-level three-body decays. These are computed here for an arbitrary number of heavy neutrinos, Higgs doublets and scalar singlets. We also take into account the new decays and scattering processes that enter the unflavoured Boltzmann equations governing the heavy-neutrino particle densities and the $(B-L)$-asymmetry evolution. Having established the framework of interest, we present a simple model with two RH neutrinos, two Higgs doublets and a complex scalar singlet, supplemented with a ${\mathcal{Z}}_8$ flavour symmetry. This symmetry minimises the number of free parameters without compromising the possibility of spontaneous CP violation and compatibility with neutrino data. In fact, the only viable ${\mathcal{Z}}_8$ charge assignment shows a preference for a non-trivial spontaneous CP-violating phase, which in turn leads to a non-vanishing CP asymmetry due to the direct link between high- and low-energy CP violation. An interesting feature of this simple setup is that the usual wave and vertex type-I seesaw contributions to the CP asymmetry vanish due to the ${\mathcal{Z}}_8$ symmetry. Thus, the observed baryon-to-photon ratio can be explained thanks to the new couplings among the heavy neutrinos and the new scalar degrees of freedom.

    hep-phJHEP(2023)·9 citations
28. 28*

    Late-Forming PBH: Beyond the CMB era

    Philip Lu🇰🇷 · Kiyoharu Kawana🇰🇷 · Alexander Kusenko🇺🇸

    The intermediate mass black hole range, $10\lesssim M_{\mathrm{BH}}^{}/M_{\odot }^{}\lesssim 10^5$, has long offered enticing possibilities for primordial black holes (PBH), with populations in this range postulated to be responsible for some of the black hole binary merger detected events as well as the existence of supermassive black holes embedded at galactic centers. However, a prominent bound derived from PBH accretion during recombination severely restricts the mass fraction of intermediate mass PBH. We address this problem by proposing a formation scenario in which ``primordial" black holes form late in our cosmological history, beyond the CMB era, and bypassing this bound. During this crucial epoch, our population of compact objects exist as thermal balls supported by thermal pressure, which eventually cool to Fermi balls supported by degeneracy pressure and finally collapse to PBH. Our mechanism is a viable production method for both the mass gap LIGO-VIRGO-KAGRA detections and the JWST observation of an early time $z>10$ supermassive black hole. Furthermore, we present the remarkable possibility of PBH formation after the present era, which we term \textit{future} PBH. Such a population would evade most, if not all bounds on the PBH mass spectrum in the literature and open up previously unthought-of possibilities. Light future PBH could form below the Hawking evaporation threshold and convert the bulk of the matter in the Universe into radiation.

    ↳ astro-ph.COhep-phPRD(2023)·28 citations
29. 29*

    Gradient flow step-scaling function for SU(3) with $N_f=8$ fundamental flavors

    Anna Hasenfratz🇺🇸 · Claudio Rebbi🇺🇸 · Oliver Witzel🇩🇪

    The step-scaling function, the lattice analog of the renormalization group $\beta$ function, is presented for the SU(3) gauge system with eight flavors in the fundamental representation. Our investigation is based on generating dynamical eight flavor gauge field configurations using stout-smeared Möbius domain wall fermions and Symanzik gauge action. On these gauge field configurations we perform gradient flow measurements using the Zeuthen, Wilson, or Symanzik kernel and consider the Symanzik, Wilson plaquette, or clover operators to determine step-scaling functions for a scale change $s=2$ including large, up to $48^4$, volumes. Considering different flows and operators as well as the optional use of tree-level improvement allows us to check for possible systematic effects. Our result covers the range of renormalized coupling up to $g_c^2\lesssim 10$. In the case of $N_f=8$ we observe that the reach in $g_c^2$ is limited due to an unphysical first order bulk phase transition caused by large ultra-violet fluctuations. We compare our findings to $N_f=4$, 6, 10 or 12 flavors results that are obtained using the same lattice action and analysis. In addition we investigate the phase structure for simulations with different number of flavors using stout-smeared Möbius domain wall fermions and Symanzik gauge actions to shed some light on the limited reach in $g_c^2$.

    ↳ hep-lathep-phPRD(2023)·20 citations
30. 30*

    Muonic-Atom Spectroscopy and Impact on Nuclear Structure and Precision QED Theory

    Aldo Antognini🇨🇭 · Sonia Bacca🇩🇪 · Andreas Fleischmann🇩🇪 · Loredana Gastaldo🇩🇪 · Franziska Hagelstein🇨🇭 · Paul Indelicato🇫🇷 · Andreas Knecht🇨🇭 · Vadim Lensky🇩🇪 · Ben Ohayon🇮🇱 · Vladimir Pascalutsa🇩🇪 · Nancy Paul🇫🇷 · Randolf Pohl🇩🇪 · Frederik Wauters🇩🇪

    Recent progress in laser and x-ray spectroscopy of muonic atoms offers promising long-term possibilities at the intersection of atomic, nuclear and particle physics. In muonic hydrogen, laser spectroscopy measurements will determine the ground-state hyperfine splitting (HFS) and additionally improve the Lamb shift by a factor of 5. Precision spectroscopy with cryogenic microcalorimeters has the potential to significantly improve the charge radii of the light nuclei in the $Z=3-8$ range. Complementary progress in precision should be achieved on the theory of nucleon- and nuclear-structure effects. The impact of this muonic-atom spectroscopy program will be amplified by the upcoming results from H and He${}^{+}$ spectroscopy, simple molecules such as HD${}^{+}$ and Penning trap measurements. In this broader context, one can test ab-initio nuclear theories, bound-state QED for two- or three-body systems, and determine fundamental constants, such as the Rydberg ($R_{\infty }$) and the fine-structure ($\alpha$) constants.

    ↳ nucl-thhep-phphysics.atom-ph16 citations
31. 31*

    Spin Density Matrix Elements in Exclusive ${\rho }^0$ Meson Muoproduction

    G. D. Alexeev · M. G. Alexeev · C. Alice · A. Amoroso · V. Andrieux · V. Anosov · K. Augsten · W. Augustyniak · C. D. R. Azevedo · B. Badelek · J. Barth · R. Beck and 178 other authors

    We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive ${\rho }^0$ meson muoproduction at COMPASS using 160~GeV/$c$ polarised ${\mu }^{+}$ and ${\mu }^{-}$ beams impinging on a liquid hydrogen target. The measurement covers the kinematic range 5.0~GeV/$c^2$ $<W<$ 17.0~GeV/$c^2$, 1.0 (GeV/$c$)${}^2$ $<Q^2<$ 10.0 (GeV/$c$)${}^2$ and 0.01 (GeV/$c$)${}^2$ $<p_{\mathrm{T}}^2<$ 0.5 (GeV/$c$)${}^2$. Here, $W$ denotes the mass of the final hadronic system, $Q^2$ the virtuality of the exchanged photon, and $p_{\mathrm{T}}$ the transverse momentum of the ${\rho }^0$ meson with respect to the virtual-photon direction. The measured non-zero SDMEs for the transitions of transversely polarised virtual photons to longitudinally polarised vector mesons (${\gamma }_T^{\ast }\to V_L^{}$) indicate a violation of $s$-channel helicity conservation. Additionally, we observe a dominant contribution of natural-parity-exchange transitions and a very small contribution of unnatural-parity-exchange transitions, which is compatible with zero within experimental uncertainties. The results provide important input for modelling Generalised Parton Distributions (GPDs). In particular, they may allow one to evaluate in a model-dependent way the role of parton helicity-flip GPDs in exclusive ${\rho }^0$ production.

    ↳ hep-exhep-phEPJC(2023)·13 citations
32. 32*

    Cosmology in theories with spontaneous scalarization of neutron stars

    Ratchaphat Nakarachinda🇹🇭 · Sirachak Panpanich🇯🇵 · Shinji Tsujikawa🇯🇵 · Pitayuth Wongjun🇹🇭

    In a model of spontaneous scalarization of neutron stars proposed by Damour and Esposite-Farese, a general relativistic branch becomes unstable to trigger tachyonic growth of a scalar field $\varphi$ toward a scalarized branch. Applying this scenario to cosmology, there is fatal tachyonic instability of $\varphi$ during inflation and matter dominance being incompatible with solar-system constraints on today's field value ${\varphi }_0$. In the presence of a four-point coupling $g^2{\varphi }^2{\chi }^2/2$ between $\varphi$ and an inflaton field $\chi$, it was argued by Anson et al. that a positive mass squared heavier than the square of a Hubble expansion rate leads to the exponential suppression of $\varphi$ during inflation and that ${\varphi }_0$ can remain small even with the growth of $\varphi$ after the radiation-dominated epoch. For several inflaton potentials approximated as $V(\chi )=m^2{\chi }^2/2$ about the potential minimum, we study the dynamics of $\varphi$ during reheating as well as other cosmological epochs in detail. For certain ranges of the coupling $g$, the homogeneous field $\varphi$ can be amplified by parametric resonance during a coherent oscillation of the inflaton. Incorporating the backreaction of created particles under a Hartree approximation, the maximum values of $\varphi$ reached during preheating are significantly smaller than those obtained without the backreaction. We also find that the minimum values of $g$ consistent with solar system bounds on $\varphi$ at the end of reheating are of order $10^{-5}$ and hence there is a wide range of acceptable values of $g$. Thus, the scenario proposed by Anson et al. naturally leads to the viable cosmological evolution of $\varphi$ consistent with local gravity constraints, without modifying the property of scalarized neutron stars.

    ↳ gr-qcastro-ph.COhep-phhep-thPRD(2023)·5 citations
33. 33*

    Cosmological constraints from the power spectrum of eBOSS quasars

    Anton Chudaykin🇨🇦 · Mikhail M. Ivanov🇺🇸

    We present the effective-field theory (EFT)-based cosmological full-shape analysis of the anisotropic power spectrum of eBOSS quasars at the effective redshift $z_{\mathrm{eff}}=1.48$. We perform extensive tests of our pipeline on simulations, paying a particular attention to the modeling of observational systematics, such as redshift smearing, fiber collisions, and the radial integral constraint. Assuming the minimal $\Lambda$CDM model, and fixing the primordial power spectrum tilt and the physical baryon density, we find the Hubble constant $H_0=(66.7\pm 3.2)$km~s${}^{-1}$Mpc${}^{-1}$, the matter density fraction ${\Omega }_m=0.32\pm 0.03$, and the late-time mass fluctuation amplitude ${\sigma }_8=0.95\pm 0.08$. These measurements are fully consistent with the Planck cosmic microwave background results. Our eBOSS quasar $S_8$ posterior, $0.98\pm 0.11$, does not exhibit the so-called $S_8$ tension. Our work paves the way for systematic full-shape analyses of quasar samples from future surveys like DESI.

    ↳ astro-ph.COhep-phPRD(2023)·51 citations
34. 34*

    Probing fluctuations and correlations of strangeness by net-kaon cumulants in Au+Au collisions at $\sqrt{s_{NN}}=7.7$ GeV

    Qian Chen🇨🇳 · Han-Sheng Wang🇨🇳 · Guo-Liang Ma🇨🇳

    We calculate the cumulants and correlation functions of net-kaon multiplicity distributions in Au+Au collisions at $\sqrt{s_{NN}}=7.7$ GeV using a multiphase transport model (AMPT) with both a new coalescence mechanism and all charge conservation laws. The AMPT model can qualitatively describe the centrality dependences of the net-kaon cumulants and cumulant ratios measured by the STAR experiment. By focusing on the stage evolution of the cumulants, cumulant ratios, and correlation functions, we reveal several key effects on the fluctuations and correlations of strangeness during the dynamical evolution of relativistic heavy-ion collisions, including strangeness production and diffusion, hadronization, hadronic rescatterings, and weak decays. Without considering the quantum chromodynamics critical fluctuations in the dynamic model, we demonstrate that the net-kaon fluctuations can largely represent the net-strangeness fluctuations. Our results provide a baseline for understanding the net-kaon and net-strangeness fluctuations, which help to search for the possible critical behaviors at the critical end point in relativistic heavy-ion collisions.

    ↳ nucl-thhep-phnucl-exPRC(2023)·6 citations
35. 35*

    Directed flow of $\Lambda$ from heavy-ion collisions and hyperon puzzle of neutron stars

    Akira Ohnishi🇯🇵 · Asanosuke Jinno🇯🇵 · Koichi Murase🇯🇵 · Yasushi Nara🇯🇵

    We examine the $\Lambda$ potential from the chiral effective field theory ($\chi$EFT) via the $\Lambda$ directed flow from heavy-ion collisions. We implement the $\Lambda$ potential obtained from the $\chi$EFT in a vector potential version of relativistic quantum molecular dynamics. We find that the $\Lambda$ potentials obtained from the $\chi$EFT assuming weak momentum dependence reproduce the $\Lambda$ directed flow measured by the STAR collaboration in the Beam Energy Scan program. While the $\Lambda$ directed flow is not very sensitive to the density dependence of the potential, the directed flow at large rapidities is susceptible to the momentum dependence. Thus understanding the directed flow of hyperons in a wide range of beam energy and rapidity is helpful in understanding hyperon potentials in dense matter.

    ↳ nucl-thhep-phEPJ Web Conf.(2022)·3 citations
36. 36*

    Detecting neutrino-boosted axion dark matter in the MeV gap

    Pierluca Carenza🇸🇪 · Pedro De la Torre Luque🇸🇪

    The elusive nature of Dark Matter (DM) remains a mystery far from being solved. A vast effort is dedicated to search for signatures of feeble DM interactions with Standard Model particles. In this work, we explore the signatures of axion DM boosted by interactions with Supernova neutrinos: Neutrino-Boosted Axion DM ($\nu$BADM). We focus on $\nu$BADM converting into photons in the Galactic magnetic field, generating a peculiar gamma-ray flux. This signal falls in the poorly explored MeV energy range, that will be probed by next generation gamma-ray missions. Once more, astrophysical searches might act as a probe of fundamental physics, unveiling the nature and properties of DM.

    ↳ astro-ph.HEhep-phEPJC(2023)·14 citations
37. 37*

    Investigating vector boson scattering: A fully gauge-invariant study

    Bernd Riederer🇦🇹 · Axel Maas🇦🇹

    Vector boson scattering (VBS) plays a central role in the search for new physics at collider experiments such as ATLAS and CMS at the LHC. Usually predictions for this kind of process are obtained using mainly perturbative approaches in fixed gauges. Here we present a fully gauge-invariant study of VBS in the scalar-channel involving three different types of Higgs-like particles characterized by their mass; above (heavy), inside (resonance) or below (stable) the elastic region. To this end, we combine results obtained in a reduced SM setup from (augmented) perturbation theory with those from non-perturbative lattice simulations.

    ↳ hep-lathep-phPoS(2022)·3 citations
38. 38*

    Deployment of High Energy Physics software with a standard method

    Thomas Hahn🇩🇪 · Andrii Verbytskyi🇩🇪

    The installation and maintenance of scientific software for research in experimental, phenomenological, and theoretical High Energy Physics (HEP) requires a considerable amount of time and expertise. While many tools are available to make the task of installation and maintenance much easier, many of these tools require maintenance on their own, have little documentation and very few are used outside of HEP community. For the installation and maintenance of the software, we rely on the well tested, extensively documented, and reliable stack of software management tools with the RPM Package Manager (RPM) at its core. The precompiled HEP software packages can be deployed easily and without detailed Linux system knowledge and are kept up-to-date through the regular system update process. The precompiled packages were tested on multiple installations of openSUSE, RHEL clones, and Fedora. As the RPM infrastructure is adopted by many Linux distributions, the approach can be used on more systems. In this contribution, we discuss our approach to software deployment in detail, present the software repositories for multiple RPM-based Linux distributions to a wider public and call for a collaboration for all the interested parties.

    ↳ physics.comp-phhep-phJ.Phys.Conf.Ser.(2023)·1 citation
39. 39*

    Bosonic Dark Matter in Light of the NICER Precise Mass-Radius Measurements

    Soroush Shakeri🇮🇷 · Davood Rafiei Karkevandi🇮🇷

    We explore the presence of self-interacting bosonic dark matter (DM) within neutron stars (NSs) in light of the latest multi-messenger observations of the Neutron Star Interior Composition Explorer (NICER) and LIGO/Virgo detectors. The bosonic DM is distributed as a core inside the NS or as a halo around it leading to formation of a DM admixed NS. We focus on the variation of the visible and dark radius of the mixed object due to DM model parameters and fractions. It is shown that DM core formation reduces the visible radius and the total mass pushing them below observational limits while halo formation is in favor of the latest mass-radius observations. Moreover, we scan over the parameter space of the bosonic DM model considering two nuclear matter equation of states by applying the radius, maximum mass and tidal deformability constraints. Our investigation allows for the exclusion of a range of DM fractions, self-coupling constant and sub-GeV boson masses, which limits the amount of accumulated DM to relatively low values to be consistent with astrophysical bounds. In this paper, we introduce main features of the pulse profile corresponding to the DM admixed NS as a novel observable quantity. We find that the depth of minimum fluxes in the pulse profiles crucially depends on the amount of DM around NS and its compactness. The current/future astrophysics missions may test the possibility of the existence of DM within NSs and break the degeneracies between different scenarios via multiple observations.

    ↳ astro-ph.HEastro-ph.COhep-phPRD(2024)·101 citations
40. 40*

    Analytic continuations of the Horn $H_1$ and $H_5$ functions

    Souvik Bera🇮🇳 · Tanay Pathak🇮🇳

    The analytic continuations (ACs) of the double variable Horn $H_1$ and $H_5$ functions have been derived for the first time using the automated symbolic $\text{Mathematica}$ package $\text{Olsson.wl}$. The use of Pfaff-Euler transformations have been emphasised to derive AC to cover regions which are otherwise not possible. The corresponding region of convergence (ROC) is obtained using its companion package $\text{ROC2.wl}$. A $\text{Mathematica}$ package $\text{HornH1H5.wl}$, containing all the derived ACs and the associated ROCs, along with a demonstration file of the same is made publicly available in https://github.com/souvik5151/Horn_H1_H5 .

    ↳ math-phhep-phhep-thmath.AP+1Eur.Phys.J.ST(2023)·6 citations
41. 41*

    White Dwarfs in Dwarf Spheroidal Galaxies: A New Class of Compact-Dark-Matter Detectors

    Juri Smirnov🇬🇧 · Ariel Goobar🇸🇪 · Tim Linden🇸🇪 · Edvard Mörtsell

    Recent surveys have discovered a population of faint supernovae, known as Ca-rich gap transients, inferred to originate from explosive ignitions of white dwarfs. In addition to their unique spectra and luminosities, these supernovae have an unusual spatial distribution and are predominantly found at large distances from their presumed host galaxies. We show that the locations of Ca-rich gap transients are well matched to the distribution of dwarf spheroidal galaxies surrounding large galaxies, in accordance with a scenario where dark matter interactions induce thermonuclear explosions among low-mass white dwarfs that may be otherwise difficult to ignite with standard stellar or binary evolution mechanisms. A plausible candidate to explain the observed event rate are primordial black holes with masses above $10^{21}$ grams.

    ↳ astro-ph.COastro-ph.GAastro-ph.HEhep-ph+1PRL(2024)·28 citations
42. 42*

    Dimensionally Reduced Waveforms for Spin-Induced Quadrupole Searches

    Horng Sheng Chia🇺🇸 · Thomas D. P. Edwards🇸🇪 · Richard N. George🇺🇸 · Aaron Zimmerman🇺🇸 · Adam Coogan🇨🇦 · Katherine Freese🇺🇸 · Cody Messick🇺🇸 · Christian N. Setzer🇸🇪

    We present highly accurate, dimensionally-reduced gravitational waveforms for binary inspirals whose components have large spin-induced quadrupole moments. The spin-induced quadrupole of a body first appears in the phase of a waveform at the early inspiral stage of the binary coalescence, making it a relatively clean probe of the internal structure of the body. However, for objects with large quadrupolar deviations from Kerr, searches using binary black hole (BBH) models would be ineffective. In order to perform a computationally-feasible search, we present two dimensionally-reduced models which are derived from the original six-dimensional post-Newtonian waveform for such systems. Our dimensional reduction method is guided by power counting in the post-Newtonian expansion, suitable reparameterizations of the source physics, and truncating terms in the phase that are small in most physically well-motivated regions of parameter space. In addition, we note that large quadrupolar deviations cause the frequency at which a binary system reaches its minimum binding energy to be reduced substantially. This minimum signals the end of the inspiral regime and provides a natural cutoff for the PN waveform. We provide accurate analytic estimates for these frequency cutoffs. Finally, we perform injection studies to test the effectualness of the dimensionally reduced waveforms. We find that over $80\%$ of the injections have an effectualness of $\epsilon >0.999$, significantly higher than is typically required for standard BBH banks, for systems with component spins of $|{\chi }_i|\lesssim 0.6$ and dimensionless quadrupole of ${\kappa }_i\lesssim 10^3$. Importantly, these waveforms represent an essential first step towards enabling an effective search for astrophysical objects with large quadrupoles.

    ↳ gr-qcastro-ph.HEastro-ph.IMhep-ph11 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.