Mon·Mar 22, 2021Monday·March 22, 2021

1. 01*

   Temperature dependence of $\rho$ meson-nucleon coupling constant from the AdS/QCD soft-wall model

   Shahin Mamedov🇦🇿 · Narmin Nasibova🇦🇿

   We investigate the dependence of the $\rho$ meson-nucleon coupling constant on the temperature of the medium using the soft-wall model of AdS/QCD. The finite temperature profile functions for the vector and fermion fields are applied to the model having a thermal dilaton field. The interaction Lagrangian in the bulk between these fields is written as in zero temperature case and includes minimal- and magnetic-type interactions. The temperature dependence of the $g_{\rho NN}(T)$ coupling constant and its terms are plotted. We observe that the coupling constant and its separate terms become zero at the medium temperature near the Hawking temperature of phase transition.

   hep-phhep-thPRD(2021)·7 citations
2. 02*

   High-energy EFT probes with fully differential Drell-Yan measurements

   Giuliano Panico🇮🇹 · Lorenzo Ricci🇨🇭 · Andrea Wulzer🇨🇭

   We study the potential of fully-differential measurements of high-energy dilepton cross-sections at the LHC to probe heavy new physics encapsulated in dimension-6 interaction operators. The assessment is performed in the seven-dimensional parameter space of operators that induce energy-growing corrections to the Standard Model partonic cross-sections at the interference level, and in the two-dimensional subspace associated with the W and Y parameters. A considerable sensitivity improvement is found relative to single-differential measurements, owing to the possibility of probing at the interference level more directions in the seven-dimensional parameter space. The reduction of parton distribution function uncertainties in the fully-differential fit is also found to play a significant role. The results are interpreted in the minimal Z' new-physics model, providing a concrete illustration of the advantages of the fully-differential analysis. We find that high-energy dilepton measurements can extend the Z' exclusion and discovery potential well beyond the reach of direct searches in a large region of the parameter space.

   hep-phhep-exJHEP(2021)·54 citations
3. 03*

   Generalized 2HDM with wrong-sign lepton Yukawa coupling, in light of $g_{\mu }-2$ and lepton flavor violation at the future LHC

   Nivedita Ghosh🇮🇳 · Jayita Lahiri🇮🇳

   To explain the observed muon anomaly and simultaneously evade bounds from lepton flavor violation in the same model parameter space is a long cherished dream. In view of a generalized Two Higgs Doublet Model, with a Yukawa structure as a perturbation of Type-X, we are able to get substantial parameter space satisfying this criteria. We are focusing on a region with "{\bf wrong-sign}" lepton-Yukawa coupling which gives rise to an interesting phenomenological consequences. We found that in the "wrong-sign" region, it is possible to probe the low-mass pseudoscalar in flavor-violating decay mode with considerably better significance compared to the "right-sign" region. Performing a simple cut-based analysis we show that at 14 TeV run of the LHC with $300f{b}^{-1}$ integrated luminosity, part of the model parameter space can be probed with significance $\ge 5\sigma$ which further improves with Artificial Neural Network analysis.

   hep-phEPJC(2021)·19 citations
4. 04*

   Looking for a vectorlike B quark at LHC using jet substructure

   Debajyoti Choudhury🇮🇳 · Kuldeep Deka🇮🇳 · Nilanjana Kumar🇮🇳

   Vectorlike quarks have been shown to resolve certain long-standing discrepancies pertaining to the bottom sector. We investigate, here, the prospects of identifying the existence of a topless vectorlike doublet $(B,Y)$, as is preferred by the electroweak precision measurements. Concentrating on single production, $viz.$ $B\bar{b}$ with $B\to b+Z/H$ subsequently, we find that the fully hadronic decay-channel is susceptible to discovery provided jet substructure observables are used. At the 13 TeV LHC with an integrated luminosity of 300 fb${}^{-1}$, a modest value of the chromomagnetic transition moments allows for the exclusion of $M\lesssim 1.8(2.2)$ TeV in the $Z$ and $H$ channels respectively.

   hep-phhep-exPRD(2021)·14 citations
5. 05*

   Coherent elastic neutrino-nucleus scattering with the $\nu$BDX-DRIFT directional detector at next generation neutrino facilities

   D. Aristizabal Sierra🇨🇱 · Bhaskar Dutta🇺🇸 · Doojin Kim🇺🇸 · Daniel Snowden-Ifft🇺🇸 · Louis E. Strigari🇺🇸

   We discuss various aspects of a neutrino physics program that can be carried out with the neutrino Beam-Dump eXperiment DRIFT ($\nu$BDX-DRIFT) detector using neutrino beams produced in next generation neutrino facilities. $\nu$BDX-DRIFT is a directional low-pressure TPC detector suitable for measurements of coherent elastic neutrino-nucleus scattering (CE$\nu$NS) using a variety of gaseous target materials which include carbon disulfide, carbon tetrafluoride and tetraethyllead, among others. The neutrino physics program includes standard model (SM) measurements and beyond the standard model (BSM) physics searches. Focusing on the Long Baseline Neutrino Facility (LBNF) beamline at Fermilab, we first discuss basic features of the detector and estimate backgrounds, including beam-induced neutron backgrounds. We then quantify the CE$\nu$NS signal in the different target materials and study the sensitivity of $\nu$BDX-DRIFT to measurements of the weak mixing angle and neutron density distributions. We consider as well prospects for new physics searches, in particular sensitivities to effective neutrino non-standard interactions.

   hep-phhep-exnucl-exnucl-thPRD(2021)·23 citations
6. 06*

   Interplay of New Physics Effects in $(g-2{)}_{\ell }$ and $h\to {\ell }^{+}{\ell }^{-}$ -- Lessons from SMEFT

   Svjetlana Fajfer🇸🇮 · Jernej F. Kamenik🇸🇮 · Michele Tammaro🇸🇮

   We explore the interplay of New Physics (NP) effects in $(g-2{)}_{\ell }$ and $h\to {\ell }^{+}{\ell }^{-}$ within the Standard Model Effective Field Theory (SMEFT) framework, including one-loop Renormalization Group (RG) evolution of the Wilson coefficients as well as matching to the observables below the electroweak symmetry breaking scale. We include both the leading dimension six chirality flipping operators including a Higgs and $SU(2{)}_L$ gauge bosons as well as four-fermion scalar and tensor operators, forming a closed operator set under the SMEFT RG equations. We compare present and future experimental sensitivity to different representative benchmark scenarios. We also consider two simple UV completions, a Two Higgs Doublet Model and a single scalar LeptoQuark extension of the SM, and show how tree level matching to SMEFT followed by the one-loop RG evolution down to the electroweak scale can reproduce with high accuracy the $(g-2{)}_{\ell }$ and $h\to {\ell }^{+}{\ell }^{-}$ contributions obtained by the complete one- and even two-loop calculations in the full models.

   hep-phJHEP(2021)·42 citations
7. 07*

   Configurational entropy of heavy-quark QCD exotica: engendering the next generation

   G. Karapetyan🇧🇷 · R. da Rocha🇧🇷

   The mass spectroscopy of exotic meson states is scrutinized in the AdS/QCD paradigm. The differential configurational entropy is then used to study, derive, and analyze the mass spectrum of excited exotic vector meson resonances, whose configurational stability is also addressed. For it the hadronic molecule, the hadrocharmonium, and the hybrid description of heavy-quark exotic mesonic states are employed to more precisely match experimental data in the Particle Data Group and also to predict the next generations of heavy-quark QCD exotica in the $Z_c$, $Y$, ${\pi }_1$, and $Z_b$ exotic meson families.

   hep-phhep-thEur.Phys.J.Plus(2021)·15 citations
8. 08*

   Longitudinal dynamics and chiral symmetry breaking in holographic light-front QCD

   Guy F. de Teramond🇨🇷 · Stanley J. Brodsky🇺🇸

   The breaking of chiral symmetry in holographic light-front QCD is encoded in its longitudinal dynamics with its chiral limit protected by the superconformal algebraic structure which governs its transverse dynamics. The scale in the longitudinal light-front Hamiltonian determines the confinement strength in this direction: It is also responsible for most of the light meson ground state mass consistent with the Gell-Mann-Oakes-Renner constraint. Longitudinal confinement and the breaking of chiral symmetry are found to be different manifestations of the same underlying dynamics as found in 't Hooft large $N_C$ QCD(1 + 1) model.

   hep-phhep-lathep-thPRD(2021)·42 citations
9. 09*

   Analytic integration methods in quantum field theory: an Introduction

   J. Blümlein🇩🇪

   A survey is given on the present status of analytic calculation methods and the mathematical structures of zero- and single scale Feynman amplitudes which emerge in higher order perturbative calculations in the Standard Model of elementary particles, its extensions and associated model field theories, including effective field theories of different kind.

   ↳ hep-thhep-phmath-phmath.MP12 citations
10. 10*

    Black-hole microstate spectroscopy: ringdown, quasinormal modes, and echoes

    Taishi Ikeda🇮🇹 · Massimo Bianchi🇮🇹 · Dario Consoli🇮🇹 · Alfredo Grillo🇮🇹 · Josè Francisco Morales🇮🇹 · Paolo Pani🇮🇹 · Guilherme Raposo🇮🇹

    Deep conceptual problems associated with classical black holes can be addressed in string theory by the ``fuzzball'' paradigm, which provides a microscopic description of a black hole in terms of a thermodynamically large number of regular, horizonless, geometries with much less symmetry than the corresponding black hole. Motivated by the tantalizing possibility to observe quantum gravity signatures near astrophysical compact objects in this scenario, we perform the first $3+1$ numerical simulations of a scalar field propagating on a large class of multicenter geometries with no spatial isometries arising from $\mathcal{N}=2$ four-dimensional supergravity. We identify the prompt response to the perturbation and the ringdown modes associated with the photon sphere, which are similar to the black-hole case, and the appearance of echoes at later time, which is a smoking gun of some structure at the horizon scale and of the regular interior of these solutions. The response is in agreement with an analytical model based on geodesic motion in these complicated geometries. Our results provide the first numerical evidence for the dynamical linear stability of fuzzballs, and pave the way for an accurate discrimination between fuzzballs and black holes using gravitational-wave spectroscopy.

    ↳ gr-qcastro-ph.HEhep-phhep-thPRD(2021)·82 citations
11. 11*

    CMB birefringence from ultra-light axion string networks

    Mudit Jain🇺🇸 · Andrew J. Long🇺🇸 · Mustafa A. Amin🇺🇸

    The polarization of Cosmic Microwave Background (CMB) photons is rotated as they pass through (ultralight-) axion string loops. Studying this birefringence can reveal valuable information about the axion-photon coupling and the structure of the string network. We develop an approximate analytic formalism and identify a kernel function that can be used to calculate the two-point correlation function for CMB birefringence induced by an arbitrary axion string network. Using this formalism, we evaluate the birefringence signal for some simple loop distributions (including scaling and network collapse). We find that the angular correlation function has a characteristic angular scale set by ${\theta }_{\min }$, which corresponds to the angular extent of the loops at the time of recombination. This results in a peak in the birefringence power spectrum around ${\ell }_p\sim 1/{\theta }_{\min }$. An additional scale, controlled by the axion's mass, is introduced if the network collapses before today.

    ↳ astro-ph.COhep-phJCAP(2021)·63 citations
12. 12*

    Is the remnant of GW190425 a strange quark star?

    J. Sedaghat🇮🇷 · S. M. Zebarjad🇮🇷 · G. H. Bordbar🇮🇷 · B. Eslam Panah🇮🇷 · R. Moradi🇮🇹

    This study investigates the effects of different QCD models on the structure of strange quark stars (SQS). In these models, the running coupling constant has a finite value in the infrared region of energy. By imposing some constraints on the strange quark matter (SQM) and exploiting the analytic and background perturbation theories, the equations of states for the SQM are obtained. Then, the properties of SQSs in general relativity are evaluated. By using component masses of GW190425 \cite{Abbott2020ApJL} as well as some conversion relations between the baryonic mass and the gravitational mass, the remnant mass of GW190425 is obtained. Our results for the maximum gravitational mass of SQS are then compared with the remnant mass of GW190425. The results indicate that the obtained maximum gravitational masses are comparable to the remnant mass of GW190425. Therefore, it is proposed that the remnant mass of GW190425 might be a SQS.

    ↳ gr-qcastro-ph.HEhep-phhep-thPLB(2022)·20 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.