Mon·Dec 21, 2020Monday·December 21, 2020

1. 01*

   Probing the Weinberg Operator at Colliders

   Benjamin Fuks🇫🇷 · Jonas Neundorf🇩🇪 · Krisztian Peters🇩🇪 · Richard Ruiz🇧🇪 · Matthias Saimpert🇨🇭

   Motivated by searches for $0\nu \beta \beta$ decay in nuclear experiments and collider probes of lepton number violation at dimension $d\ge 7$, we investigate the sensitivity to the $d=5$ Weinberg operator using the non-resonant signature $pp\to {\ell }^{\pm }{\ell }^{\prime \pm }jj$ at the LHC. We develop a prescription for the operator that is applicable in collisions and decays, and focus on the $\ell {\ell }^{\prime }=\mu \mu$ channel, which is beyond the reach of nuclear decays. For a Wilson coefficient $C_5^{\mu \mu }=1$, scales as heavy as $\Lambda \sim 8.3(11)$~TeV can be probed with $\mathcal{L}=300{\mathrm{fb}}^{-1}(3{\mathrm{ab}}^{-1})$. This translates to an effective $\mu \mu$ Majorana mass of $|m_{\mu \mu }|\sim 7.3(5.4)$~GeV, and establishes a road map for testing the Weinberg operator at accelerators.

   hep-phhep-exnucl-thPRD(2021)·52 citations
2. 02*

   Chromomagnetic and chromoelectric dipole moments of quarks in the reduced 331 model

   A. I. Hernández-Juárez🇲🇽 · A. Moyotl🇲🇽 · G. Tavares-Velasco🇲🇽

   The one-loop contributions to the chromomagnetic dipole moment ${\hat{\mu }}_t(q^2)$ and electric dipole moment ${\hat{d}}_t(q^2)$ of the top quark are calculated within the reduced 331 model (RM331) in the general case of an off-shell gluon. It is argued that the results are gauge independent for $q^2\ne 0$ and represent valid observable quantities. In the RM331 ${\hat{\mu }}_t(q^2)$ receives new contributions from two heavy gauge bosons $Z^{\prime }$ and $V^{+}$ and a new neutral scalar boson $h_2$, along with a new contribution from the standard model Higgs boson via flavor changing neutral currents. The latter, which are also mediated by the $Z^{\prime }$ gauge boson and the scalar boson $h_2$, can give a non-vanishing ${\hat{d}}_t$ provided that there is a $CP$-violating phase. The analytical results are presented in terms of both Feynman parameter integrals and Passarino-Veltman scalar functions, which are useful to cross-check the numerical results. Both ${\hat{\mu }}_t(q^2)$ and ${\hat{d}}_t$ are numerically evaluated for parameter values still allowed by the constraints from experimental data. It is found that the new one-loop contributions of the RM331 to ${\hat{\mu }}_t(q^2)$ are of the same order of magnitude or larger than in other standard model extensions, with the dominant contribution arising from the $V^{+}$ gauge boson for $\Vert q\Vert$ in the 30-1000 GeV interval and a mass $m_V$ of the order of a few hundreds of GeVs. As for ${\hat{d}}_t(q^2)$, it receives the largest contribution from $h_2$ exchange and can reach values of the order of $10^{-20}$, which is smaller than the contributions predicted by other standard model extensions.

   hep-phCPC(2021)·14 citations
3. 03*

   Particlization of an interacting hadron resonance gas with global conservation laws for event-by-event fluctuations in heavy-ion collisions

   Volodymyr Vovchenko🇺🇸 · Volker Koch🇺🇸

   We revisit the problem of particlization of a QCD fluid into hadrons and resonances at the end of the fluid dynamical stage in relativistic heavy-ion collisions in a context of fluctuation measurements. The existing methods sample an ideal hadron resonance gas, therefore, they do not capture the non-Poissonian nature of the grand-canonical fluctuations, expected due to QCD dynamics such as the chiral transition or QCD critical point. We address the issue by partitioning the particlization hypersurface into locally grand-canonical fireballs populating the space-time rapidity axis that are constrained by global conservation laws. The procedure allows to quantify the effect of global conservation laws, volume fluctuations, thermal smearing and resonance decays on fluctuation measurements in various rapidity acceptances, and can be used in fluid dynamical simulations of heavy-ion collisions. As a first application, we study event-by-event fluctuations in heavy-ion collisions at the LHC using an excluded volume hadron resonance gas model matched to lattice QCD susceptibilities, with a focus on (pseudo)rapidity acceptance dependence of net baryon, net proton, and net charge cumulants. We point out large differences between net proton and net baryon cumulant ratios that make direct comparisons between the two unjustified. We observe that the existing experimental data on net-charge fluctuations at the LHC shows a strong suppression relative to a hadronic description.

   hep-phnucl-exnucl-thPRC(2021)·51 citations
4. 04*

   How dark is the ${\nu }_R$-philic dark photon?

   Garv Chauhan🇺🇸 · Xun-Jie Xu🇧🇪

   We consider a generic dark photon that arises from a hidden $U(1)$ gauge symmetry imposed on right-handed neutrinos (${\nu }_R$). Such a ${\nu }_R$-philic dark photon is naturally dark due to the absence of tree-level couplings to normal matter. However, loop-induced couplings to charged leptons and quarks are inevitable, provided that ${\nu }_R$ mix with left-handed neutrinos via Dirac mass terms. We investigate the loop-induced couplings and find that the ${\nu }_R$-philic dark photon is not inaccessibly dark, which could be of potential importance to future dark photon searches at SHiP, FASER, Belle-II, LHC 14 TeV, etc.

   hep-phJHEP(2021)·25 citations
5. 05*

   The Lepton Flavor Changing Decays and One-loop Muon Anomalous Magnetic Moment in the Extended Mirror Twin Higgs Models

   Guo-Li Liu🇨🇳 · Fei Wang🇨🇳 · Wenyu Wang🇨🇳

   Mirror Twin Higgs(MTH) models always contain heavy gauge bosons and extra Higgses. Besides, to accommodate tiny neutrino masses via seesaw mechanism, new heavy neutrinos can also be introduced in MTH extension models. Such new particles and interactions may lead to new contributions to the lepton flavor violating (LFV) processes, including ${\ell }_i\to {\ell }_j\gamma$ and ${\ell }_i\to {\ell }_j{\ell }_k{\ell }_l$. We find that current experimental data can stringently constrain the parameter spaces and certain LFV processes can possibly be tested by the next generation colliders. One-loop contributions of the new particles to the muon anomalous magnetic momentumare also calculated. Such contributions can still not solve the discrepancy between the experiments and the prediction of the standard model.

   hep-phMod.Phys.Lett.A(2023)·2 citations
6. 06*

   Coupling hadron-hadron thresholds within a chiral quark model approach

   Pablo G. Ortega🇪🇸 · David R. Entem🇪🇸

   Heavy hadron spectroscopy was well understood within the naive quark model until the end of the past century. However, in 2003, the $X(3872)$ was discovered, with puzzling properties difficult to understand in the simple naive quark model picture. This state made clear that excited states of heavy mesons should be coupled to two-meson states in order to understand not only the masses but, in some cases, unexpected decay properties. In this work we will review how the naive quark model can be complemented with the coupling to two hadron thresholds. This program has been already applied to the heavy meson spectrum with the chiral quark model and we show some examples where thresholds are of special relevance.

   hep-phSymmetry(2021)·26 citations
7. 07*

   Charmed baryon productions in proton-antiproton collisions in effective Lagrangian and Regge approaches

   Thanat Sangkhakrit🇹🇭 · Sang-In Shim🇯🇵 · Yupeng Yan🇹🇭 · Atsushi Hosaka🇯🇵

   Strange and charmed baryon productions from proton-antiproton collisions are studied in the effective Lagrangian and Regge approaches. We include only the $t$-channel dynamics which is dominant for the diffractive region that is relevant in the present discussions. For strangeness productions, the coupling constants for $K$ meson are determined by $SU(3)$ relations while other unknown parameters for $K^{\ast }$ couplings and for form factors are fixed by existing observed data for strangeness productions. By extrapolating the amplitudes for strangeness productions to those for charm, we predict charm production cross sections. It turns out that the total cross sections are $10^4$ to $10^5$ smaller than those of strangeness productions, depending on the final states. By using the known total cross sections for strangeness, $\sim 10^2\mu b$ for $\Lambda \bar{\Lambda }$ and, $\sim 10^1\mu b$ for $\Sigma \bar{\Lambda }$ the total cross sections for charm productions are predicted to be $\sim 10^{-2}\mu b$ for ${\Lambda }_c{\bar{\Lambda }}_c$, $\sim 10^{-3}\mu b$ for ${\Sigma }_c{\bar{\Lambda }}_c$, and $\sim 10^{-4}\mu b$ for ${\Sigma }_c{\bar{\Sigma }}_c$. Our results can be tested in the future experiments at $\bar{\text{P}}$ANDA.

   hep-phEPJA(2022)·5 citations
8. 08*

   Relativistic mean-field corrections for interactions of dark matter particles with nucleons

   X. G. Wang🇦🇺 · A. W. Thomas🇦🇺

   We investigate the interactions of weakly interacting massive particles (WIMPS) with nucleons in nuclear medium by taking into account the effect of nuclear dynamics. We derive the nonrelativistic effective operators starting from the relativistic mean-field approximation. Certain interactions receive non-negligible corrections, which may significantly change the sensitivities of WIMP-nucleus scattering cross section to these effective operators.

   hep-phhep-exnucl-thPRC(2021)·3 citations
9. 09*

   Nonlocal SU(5) GUT

   N.V.Krasnikov🇷🇺

   We show that in nonlocal generalization of standard nonsupersymmetric SU(5) GUT it is possible to solve the problems with the proton lifetime and the Weinberg angle without introduction of additional particles in the spectrum of the theory. Non-local scale responsible for ultraviolet cutoff coincides (up to some factor) with GUT scale. We find that in the simplest nonlocal modification of the SU(5) model $M_{\mathrm{GUT}}=3\ast 10^{16}$ GeV . In general case the value of M_GUT is an arbitrary and the most interesting option $M_{\mathrm{GUT}}=O(M_{\mathrm{PL}})$ could be realized.

   hep-phMod.Phys.Lett.A(2021)·7 citations
10. 10*

    Dependence of related parameters on centrality and mass in a new treatment for transverse momentum spectra in high energy collisions

    Pei-Pin Yang🇨🇳 · Mai-Ying Duan🇨🇳 · Fu-Hu Liu🇨🇳

    We collected the experimental data of transverse momentum spectra of identified particles produced in proton-proton ($p$-$p$), deuteron-gold ($d$-Au or $d$-$A$), gold-gold (Au-Au or $A$-$A$), proton-lead ($p$-Pb or $p$-$A$), and lead-lead (Pb-Pb or $A$-$A$) collisions measured by the ALICE, CMS, LHCb, NA49, NA61/SHINE, PHENIX, and STAR collaborations at different center-of mass energies. The multisource thermal model at the quark level or the participant quark model is used to describe the experimental data. The free parameters, the effective temperature $T$, entropy index-related $n$, and revised index $a_0$, in the revised Tsallis--Pareto-type function are extracted at the quark level. In most cases, $T$ and $n$ in central collisions are larger than those in peripheral collisions, and $a_0$ does not change in different centrality classes. With the increase in the mass of produced particle or participant quark, $T$ and $a_0$ increase, and $n$ does not change significantly. The behaviors of related parameters from $p$-$p$, $p(d)$-$A$, and $A$-$A$ collisions are similar.

    hep-phhep-exnucl-exnucl-thEPJA(2021)·11 citations
11. 11*

    Non-thermal Production of PNGB Dark Matter and Inflation

    Yoshihiko Abe🇯🇵 · Takashi Toma🇯🇵 · Koichi Yoshioka🇯🇵

    A pseudo Nambu-Goldstone boson (pNGB) is a natural candidate of dark matter in that it avoids the severe direct detection bounds. We show in this paper that the pNGB has another different and interesting face with a higher symmetry breaking scale. Such large symmetry breaking is motivated by various physics beyond the standard model. In this case, the pNGB interaction is suppressed due to the Nambu-Goldstone property and the freeze-out production does not work even with sufficiently large portal coupling. We then study the pNGB dark matter relic abundance from the out-of-equilibrium production via feeble Higgs portal coupling. Further, a possibility is pursued the symmetry breaking scalar in the pNGB model plays the role of inflaton. The inflaton and dark matter are unified in a single field and the pNGB production from inflaton decay is inevitable. For these non-thermally produced relic abundance of pNGB dark matter and successful inflation, we find that the dark matter mass should be less than a few GeV in the wide range of the reheating temperature and the inflaton mass.

    hep-phJHEP(2021)·21 citations
12. 12*

    Longitudinal Z-Boson Polarization and the Higgs Boson Production Cross Section at the Large Hadron Collider

    S. Amoroso🇩🇪 · J. Fiaschi🇩🇪 · F. Giuli🇨🇭 · A. Glazov🇩🇪 · F. Hautmann🇧🇪 · O. Zenaiev🇨🇭

    Charged lepton pairs are produced copiously in high-energy hadron collisions via electroweak gauge boson exchange, and are one of the most precisely measured final states in proton-proton collisions at the Large Hadron Collider (LHC). We propose that measurements of lepton angular distributions can be used to improve the accuracy of theoretical predictions for Higgs boson production cross sections at the LHC. To this end, we exploit the sensitivity of the lepton angular coefficient associated with the longitudinal Z-boson polarization to the parton density function (PDF) for gluons resolved from the incoming protons, in order to constrain the Higgs boson cross section from gluon fusion processes. By a detailed numerical analysis using the open-source platform xFitter, we find that high-statistics determinations of the longitudinally polarized angular coefficient at the LHC Run III and high-luminosity HL-LHC improve the PDF systematic uncertainties of the Higgs boson cross section predictions by 50% over a broad range of Higgs boson rapidities.

    hep-phPLB(2021)·20 citations
13. 13*

    Combined subleading high-energy logarithms and NLO accuracy for W production in association with multiple jets

    Jeppe R. Andersen🇬🇧 · James A. Black🇬🇧 · Helen M. Brooks🇦🇺 · Emmet P. Byrne🇬🇧 · Andreas Maier🇩🇪 · Jennifer M. Smillie🇬🇧

    Large logarithmic corrections in $\hat{s}/p_t^2$ lead to substantial variations in the perturbative predictions for inclusive $W$-plus-dijet processes at the Large Hadron Collider. This instability can be cured by summing the leading-logarithmic contributions in $\hat{s}/p_t^2$ to all orders in ${\alpha }_s$. As expected though, leading logarithmic accuracy is insufficient to guarantee a suitable description in regions of phase space away from the high energy limit. We present (i) the first calculation of all partonic channels contributing at next-to-leading logarithmic order in $W$-boson production in association with at least two jets, and (ii) bin-by-bin matching to next-to-leading fixed-order accuracy. This new perturbative input is implemented in \emph{High Energy Jets}, and systematically improves the description of available experimental data in regions of phase space which are formally subleading with respect to $\hat{s}/p_t^2$.

    hep-phJHEP(2021)·20 citations
14. 14*

    The strong coupling from an improved $\tau$ vector isovector spectral function

    Diogo Boito🇧🇷 · Maarten Golterman🇺🇸 · Kim Maltman🇨🇦 · Santiago Peris🇪🇸 · Marcus V. Rodrigues🇧🇷 · Wilder Schaaf🇺🇸

    We combine ALEPH and OPAL results for the spectral distributions measured in $\tau \to {\pi }^{-}{\pi }^0{\nu }_{\tau }$, $\tau \to 2{\pi }^{-}{\pi }^{+}{\pi }^0{\nu }_{\tau }$ and $\tau \to {\pi }^{-}3{\pi }^0{\nu }_{\tau }$ decays with (i) recent BaBar results for the analogous $\tau \to K^{-}{K}^0{\nu }_{\tau }$ distribution and (ii) estimates of the contributions from other hadronic $\tau$-decay modes obtained using CVC and electroproduction data, to obtain a new and more precise non-strange, inclusive vector, isovector spectral function. The BaBar $K^{-}{K}^0$ and CVC/electroproduction results provide us with alternate, entirely data-based input for the contributions of all exclusive modes for which ALEPH and OPAL employed Monte-Carlo-based estimates. We use the resulting spectral function to determine ${\alpha }_s(m_{\tau })$, the strong coupling at the $\tau$ mass scale, employing finite energy sum rules. Using the fixed-order perturbation theory (FOPT) prescription, we find ${\alpha }_s(m_{\tau })=0.3077\pm 0.0075$, which corresponds to the five-flavor result ${\alpha }_s(M_Z)=0.1171\pm 0.0010$ at the $Z$ mass. While we also provide an estimate using contour-improved perturbation theory (CIPT), we point out that the FOPT prescription is to be preferred for comparison with other ${\alpha }_s$ determinations employing the $\overline{\mathrm{MS}}$ scheme, especially given the inconsistency between CIPT and the standard operator product expansion recently pointed out in the literature. Additional experimental input on the dominant $2\pi$ and $4\pi$ modes would allow for further improvements to the current analysis.

    hep-phhep-exPRD(2021)·59 citations
15. 15*

    FIMP Dark Matter in Clockwork/Linear Dilaton Extra-Dimensions

    Nicolás Bernal🇨🇴 · Andrea Donini🇪🇸 · Miguel G. Folgado🇪🇸 · Nuria Rius🇪🇸

    We study the possibility that Dark Matter (DM) is made of Feebly Interacting Massive Particles (FIMP) interacting just gravitationally with the Standard Model particles in the framework of a Clockwork/Linear Dilaton (CW/LD) model. We restrict here to the case in which the DM particles are scalar fields. This paper extends our previous study of FIMP's in Randall-Sundrum (RS) warped extra-dimensions. As it was the case in the RS scenario, also in the CW/LD model we find a significant region of the parameter space in which the observed DM relic abundance can be reproduced with scalar DM mass in the MeV range, with a reheating temperature varying from 10 GeV to $10^9$ GeV. We comment on the similarities of the results in both extra-dimensional models.

    hep-phJHEP(2021)·17 citations
16. 16*

    Top and Beauty synergies in SMEFT-fits at present and future colliders

    Stefan Bißmann🇩🇪 · Cornelius Grunwald🇩🇪 · Gudrun Hiller🇩🇪 · Kevin Kröninger🇩🇪

    We perform global fits within Standard Model Effective Field Theory (SMEFT) combining top-quark pair production processes and decay with $b\to s$ flavor changing neutral current transitions and $Z\to b\bar{b}$ in three stages: using existing data from the LHC and $B$-factories, using projections for the HL-LHC and Belle II, and studying the additional new physics impact from a future lepton collider. The latter is ideally suited to directly probe ${\ell }^{+}{\ell }^{-}\to t\bar{t}$ transitions. We observe powerful synergies in combining both top and beauty observables as flat directions are removed and more operators can be probed. We find that a future lepton collider significantly enhances this interplay and qualitatively improves global SMEFT fits.

    hep-phJHEP(2021)·100 citations
17. 17*

    Has the Origin of the Third-Family Fermion Masses been Determined?

    Michael J. Baker🇦🇺 · Peter Cox🇦🇺 · Raymond R. Volkas🇦🇺

    Precision measurements of the Higgs couplings are, for the first time, directly probing the mechanism of fermion mass generation. The purpose of this work is to determine to what extent these measurements can distinguish between the tree-level mechanism of the Standard Model and the theoretically motivated alternative of radiative mass generation. Focusing on the third-family, we classify the minimal one-loop models and find that they fall into two general classes. By exploring several benchmark models in detail, we demonstrate that a radiative origin for the tau-lepton and bottom-quark masses is consistent with current observations. While future colliders will not be able to rule out a radiative origin, they can probe interesting regions of parameter space.

    hep-phJHEP(2021)·27 citations
18. 18*

    $P$-wave dibaryon resonances in $pp$ elastic scattering and near-threshold pion production

    O.A. Rubtsova🇷🇺 · V.I. Kukulin🇷🇺 · M.N. Platonova🇷🇺

    It is demonstrated within the dibaryon-induced model for $NN$ interaction that $pp$ scattering in $P$ waves is governed mainly by the production of the intermediate dibaryon resonances. Two dibaryon resonances with a mass of about 2200 MeV discovered recently by the ANKE-COSY Collaboration are shown to determine both elastic $pp$ phase shifts and inelasticities in the ${}^3{P}_0$ and ${}^3{P}_2$-${}^3{F}_2$ channels from zero energy up to $T_p=0.7$-$0.9$ GeV. It is also demonstrated clearly that the ${}^3{P}_0$ dibaryon plays a decisive role in near-threshold neutral pion production in $pp$ collisions which is poorly understood to date. The missing dibaryon contribution is found to be the very possible reason for the failure of traditional approaches to explain near-threshold ${\pi }^0$ production.

    ↳ nucl-thhep-phPRD(2020)·6 citations
19. 19*

    The reactor antineutrino spectrum calculation

    S. V. Silaeva🇷🇺 · V. V. Sinev🇷🇺

    New fissile isotopes antineutrino spectra (${}^{235}$U, ${}^{238}$U, ${}^{239}$Pu and ${}^{241}$Pu) calculation is presented. On base of summation method the toy model was developed. It was shown that total antineutrino number is conserved in framework of given database on individual fragments yields. The analysis of antineutrino spectrum shape says that any presented antineutrino spectrum should satisfy to the total antineutrino number conservation.

    ↳ nucl-exhep-phnucl-th6 citations
20. 20*

    Proper static potential in classical lattice gauge theory at finite T

    Alexander Lehmann🇩🇪 · Alexander Rothkopf🇳🇴

    We compute the proper real-time interaction potential between a static quark and antiquark in classical lattice gauge theory at finite temperature. Our central result is the determination of the screened real-part of this potential, and we reconfirm the presence of an imaginary part. The real part is intimately related to the back-reaction of the static sources onto the gauge fields, incorporated via Gauss's law. Differences in the treatment of static sources in quantum and classical lattice gauge theory are discussed.

    ↳ hep-lathep-phJHEP(2021)·11 citations
21. 21*

    ILC as a SUSY discovery and precision instrument

    María Teresa Núñez Pardo de Vera🇩🇪

    Data from the LHC at 7, 8, and 13 TeV have so far yielded no evidence for new particles beyond the 125 GeV Higgs boson; in particular, there have been no signs of SUSY. However, the complementary nature of physics with $e^{+}{e}^{-}$ collisions still offers many interesting scenarios in which SUSY can be discovered at the ILC. These scenarios take advantage of the capability of $e^{+}{e}^{-}$ collisions to observe events with missing four-momentum -- a signature not available at hadron colliders, where only transverse imbalance is observable. Due to low backgrounds and trigger-less operation, detectors at $e^{+}{e}^{-}$ colliders can observe events with much less visible energy than what is possible at hadron colliders. In this contribution, we will present detailed simulation studies done with the ILD concept at the ILC. These studies include simulation of the full SM background, as well as realistic accelerator conditions. We will show results both on expected discovery and exclusion reaches for the most challenging SUSY channels, such as higgsinos or winos at low mass differences. Evaluations of precision of model-parameter measurements, in case of discovery, will also be given. We also report on how such measurements can be used to put constraints on parts of the sparticle-spectrum beyond direct reach, and to discriminate between different models of SUSY breaking at high scales.

    ↳ hep-exhep-ph1 citation
22. 22*

    N-body simulations of dark matter with frequent self-interactions

    Moritz S. Fischer🇩🇪 · Marcus Brüggen🇩🇪 · Kai Schmidt-Hoberg🇩🇪 · Klaus Dolag🇩🇪 · Felix Kahlhoefer🇩🇪 · Antonio Ragagnin🇮🇹 · Andrew Robertson🇬🇧

    Self-interacting dark matter (SIDM) models have the potential to solve the small-scale problems that arise in the cold dark matter paradigm. Simulations are a powerful tool for studying SIDM in the context of astrophysics, but it is numerically challenging to study differential cross-sections that favour small-angle scattering, as in light-mediator models. Here, we present a novel approach to model frequent scattering based on an effective drag force, which we have implemented into the N-body code gadget-3. In a range of test problems, we demonstrate that our implementation accurately models frequent scattering. Our implementation can be used to study differences between SIDM models that predict rare and frequent scattering. We simulate core formation in isolated dark matter haloes, as well as major mergers of galaxy clusters and find that SIDM models with rare and frequent interactions make different predictions. In particular, frequent interactions are able to produce larger offsets between the distribution of galaxies and dark matter in equal-mass mergers.

    ↳ astro-ph.COastro-ph.GAhep-phMNRAS(2021)·50 citations
23. 23*

    Sources of $H_0$-tensions in dark energy scenarios

    Balakrishna S. Haridasu🇮🇹 · Matteo Viel🇮🇹 · Nicola Vittorio🇮🇹

    By focusing on the simple $w\ne -1$ extension to $\Lambda$CDM, we assess which epoch(s) possibly source the $H_0$-tension. We consider Cosmic Microwave Background (CMB) data in three possible ways: $i)$ complete CMB data; $ii)$ excluding the $l<30$ temperature and polarization likelihoods; $iii)$ imposing early universe priors, that disentangle early and late time physics. Through a joint analysis with low-redshift supernovae type-Ia and gravitationally lensed time delay datasets, {and neglecting galaxy clustering Baryonic Acoustic Oscillation (BAO) data}, we find that the inclusion of early universe CMB priors is consistent with the local estimate of $H_0$ while excluding the low-$l$+lowE likelihoods mildly relaxes the tension. This is in contrast to joint analyses with the complete CMB data. Our simple implementation of contrasting the effect of different CMB priors on the $H_0$ estimate shows that the early universe information from the CMB data when decoupled from late-times physics could be in agreement with a higher value of $H_0$. {We also find no evidence for the early dark energy model using only the early universe physics within the CMB data. Finally using the BAO data in different redshift ranges to perform inverse distance ladder analysis, we find that the early universe modifications, while being perfectly capable of alleviating the $H_0$-tension when including the BAO galaxy clustering data, would be at odds with the Ly-$\alpha$ BAO data due to the difference in $r_{\mathrm{d}}vs.H_0$ correlation between the two BAO datasets.} We therefore infer and speculate that source for the $H_0$-tension between CMB and local estimates could possibly originate in the modeling of late-time physics within the CMB analysis. This in turn recasts the $H_0$-tension as an effect of late-time physics in CMB, instead of the current early-time CMB vs. local late-time physics perspective.

    ↳ astro-ph.COhep-phPRD(2021)·37 citations
24. 24*

    Scalable cold-atom quantum simulator for two-dimensional QED

    Robert Ott🇩🇪 · Torsten V. Zache🇦🇹 · Fred Jendrzejewski🇩🇪 · Jürgen Berges🇩🇪

    We propose a scalable analog quantum simulator for quantum electrodynamics (QED) in two spatial dimensions. The setup for the U(1) lattice gauge field theory employs inter-species spin-changing collisions in an ultra-cold atomic mixture trapped in an optical lattice. Building on the previous one-dimensional implementation scheme of Ref. [1] we engineer spatial plaquette terms for magnetic fields, thus solving a major obstacle towards experimental realizations of realistic gauge theories in higher dimensions. We apply our approach to pure gauge theory and discuss how the phenomenon of confinement of electric charges can be described by the quantum simulator.

    ↳ cond-mat.quant-gashep-phquant-phPRL(2021)·48 citations
25. 25*

    LeptonInjector and LeptonWeighter: A neutrino event generator and weighter for neutrino observatories

    R. Abbasi🇺🇸 · M. Ackermann🇩🇪 · J. Adams🇳🇿 · J. A. Aguilar🇧🇪 · M. Ahlers🇩🇰 · M. Ahrens🇸🇪 · C. Alispach🇨🇭 · A. A. Alves Jr.🇩🇪 · N. M. Amin🇺🇸 · R. An🇺🇸 · K. Andeen🇺🇸 · T. Anderson🇺🇸 and 354 other authors

    We present a high-energy neutrino event generator, called LeptonInjector, alongside an event weighter, called LeptonWeighter. Both are designed for large-volume Cherenkov neutrino telescopes such as IceCube. The neutrino event generator allows for quick and flexible simulation of neutrino events within and around the detector volume, and implements the leading Standard Model neutrino interaction processes relevant for neutrino observatories: neutrino-nucleon deep-inelastic scattering and neutrino-electron annihilation. In this paper, we discuss the event generation algorithm, the weighting algorithm, and the main functions of the publicly available code, with examples.

    ↳ physics.comp-phhep-exhep-phComput.Phys.Commun.(2021)·44 citations
26. 26*

    RG Flows with Global Symmetry Breaking and Bounds from Chaos

    Sandipan Kundu🇺🇸

    We discuss general aspects of renormalization group (RG) flows between two conformal fixed points in 4d with a broken continuous global symmetry in the UV. Every such RG flow can be described in terms of the dynamics of Nambu-Goldstone bosons of broken conformal and global symmetries. We derive the low-energy effective action that describes this class of RG flows from basic symmetry principles. We view the theory of Nambu-Goldstone bosons as a theory in anti-de Sitter space with the flat space limit. This enables an equivalent CFT${}_3$ formulation of these 4d RG flows in terms of spectral deformations of a generalized free CFT${}_3$. We utilize this dual description to impose further constraints on the low energy effective action associated with unitary RG flows in 4d by invoking the chaos bound in 3d. This approach naturally provides a set of independent monotonically decreasing $C$-functions for 4d RG flows with global symmetry breaking by explicitly relating 4d $C$-functions with certain out-of-time-order correlators that diagnose chaos in 3d. We also comment on a more general connection between RG and chaos in QFT.

    ↳ hep-thcond-mat.str-elhep-phquant-phPRD(2022)·6 citations
27. 27*

    Modified Hawking radiation of stationary and nonstationary Kerr-Newman-de Sitter black hole

    S. Christina🇮🇳 · T. Ibungochouba Singh🇮🇳

    In this paper, the tunneling of vector boson particles across the event horizon of Kerr-Newman-de Sitter (KNdS) black hole is investigated using the WKB approximation and Hamilton-Jacobi ansatz to Proca equation. The tunneling probability and radiation spectrum at the event horizon of KNdS black hole is obtained. The modified Hawking radiation of stationary and non-stationary KNdS black hole are also investigated using the Rarita-Schwinger ansatz to the deformed Hamilton-Jacobi method and new tortoise coordinate transformation. It is observed that the modified Hawking temperatures near the event horizon for both stationary and nonstationary space times are dependent on the black hole parameters.

    ↳ gr-qchep-phGen.Rel.Grav.(2021)·16 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.