Thu·Jan 9, 2020Thursday·January 9, 2020

1. 01*

   Constraints on neutrino millicharge and charge radius from neutrino-atom scattering

   Matteo Cadeddu🇮🇹 · Carlo Giunti🇮🇹 · Konstantin A. Kouzakov🇷🇺 · Yufeng Li🇨🇳 · Alexander I. Studenikin🇷🇺 · Yiyu Zhang🇨🇳

   We consider possible effects of neutrino electric charge (millicharge) and charge radius on the neutrino-atom interaction processes such as (i) atomic ionization by neutrino impact and (ii) coherent elastic neutrino-nucleus scattering. The bounds on the neutrino millicharge and charge radius that follow from, respectively, the GEMMA and COHERENT experiments are presented and discussed.

   hep-phastro-ph.HEPoS(2020)·3 citations
2. 02*

   Probing an emergent $U(1)$ extension of the Standard Model at colliders

   Tran N. Hung🇻🇳 · Cao H. Nam🇻🇳

   We explore the potential of probing for a new neutral gauge boson that emerges from a topologically nontrivial structure of spacetime, focusing on its couplings to the fermions of the Standard Model. We analyze the current experimental constraints on the mass of the new gauge boson and the radius of the fifth dimension, using the LEP bound and the LHC with 140 ${\text{fb}}^{-1}$ luminosity. In addition, we investigate the indirect search of the new gauge boson and its discrimination from other hypothetical gauge bosons like those predicted in the $U(1{)}_{B-L}$ and $U(1{)}_R$ models by studying the forward-backward, left-right, and left-right-forward-backward asymmetries.

   hep-phEur.Phys.J.Plus(2024)·5 citations
3. 03*

   Revisiting oscillon formation in KKLT scenario

   Shinta Kasuya🇯🇵 · Masahiro Kawasaki🇯🇵 · Francis Otani🇯🇵 · Eisuke Sonomoto🇯🇵

   KKLT scenario has succeeded in stabilizing the volume modulus and constructing metastable de Sitter (dS) vacua in type IIB string theory. We revisit to investigate the possibility of the oscillon (or I-ball) formation in the KKLT scenario when the volume modulus is initially displaced from the dS minimum. Special attention is paid to physically realistic initial conditions of the volume modulus, which was not taken in the literature. Using lattice simulations, we find that oscillons do not form unless the volume modulus is initially placed at very near the local maximum, which requires severe fine-tuning.

   hep-phPRD(2020)·8 citations
4. 04*

   Lack of Debye and Meissner screening in strongly magnetized quark matter at intermediate densities

   Bo Feng🇨🇳 · Efrain J. Ferrer🇺🇸 · Israel Portillo🇺🇸

   We study the static responses of cold quark matter in the intermediate baryonic density region (characterized by a chemical potential $\mu$) in the presence of a strong magnetic field. We consider in particular, the so-called Magnetic Dual Chiral Density Wave (MDCDW) phase, which is materialized by an inhomogeneous condensate formed by a particle-hole pair. It is shown, that the MDCDW phase is more stable in the weak-coupling regime than the one considered in the magnetic catalysis of chiral symmetry braking phenomenon (MC$\chi$SB) and even than the chiral symmetric phase that was expected to be realized at sufficiently high baryonic chemical potential. The different components of the photon polarization operator of the MDCDW phase in the one-loop approximation are calculated. We found that in the MDCDW phase there is no Debye screening neither Meissner effect in the lowest-Landau-level approximation. The obtained Debye length depends on the amplitude $m$ and modulation $b$ of the inhomogeneous condensate and it is only different from zero if the relation $|\mu -b|>m$ holds. But, we found that in the region of interest this inequality is not satisfied. Thus, no Debye screening takes place under those conditions. On the other hand, since the particle-hole condensate is electrically neutral, the U(1) electromagnetic group is not broken by the ground state and consequently there is no Meissner effect. These results can be of interest for the astrophysics of neutron stars.

   hep-phastro-ph.HEnucl-thPRD(2020)·14 citations
5. 05*

   Muon $g-2$ in Higgs-anomaly mediation

   Tsutomu T. Yanagida🇯🇵 · Wen Yin🇰🇷 · Norimi Yokozaki🇯🇵

   A simple model for the explanation of the muon anomalous magnetic moment was proposed by the present authors within the context of the minimal supersymmetric standard model [1607.05705, 1608.06618]: "Higgs-anomaly mediation". In the setup, squarks, sleptons, and gauginos are massless at tree-level, but the Higgs doublets get large negative soft supersymmetry (SUSY) breaking masses squared $m_{H_u}^2\simeq m_{H_d}^2<0$ at a certain energy scale, $M_{\mathrm{inp}}$. The sfermion masses are radiatively generated by anomaly mediation and Higgs-loop effects, and gaugino masses are solely determined by anomaly mediation. Consequently, the smuons and bino are light enough to explain the muon $g-2$ anomaly while the third generation sfermions are heavy enough to explain the observed Higgs boson mass. The scenario avoids the SUSY flavor problem as well as various cosmological problems, and is consistent with the radiative electroweak symmetry breaking. In this paper, we show that, although the muon $g-2$ explanation in originally proposed Higgs-anomaly mediation with $M_{\mathrm{inp}}\sim 10^{16}$GeV is slightly disfavored by the latest LHC data, the muon $g-2$ can still be explained at $1\sigma$ level when Higgs mediation becomes important at the intermediate scale, $M_{\mathrm{inp}}\sim 10^{12}$GeV. The scenario predicts light SUSY particles that can be fully covered by the LHC and future collider experiments. We also provide a simple realization of $m_{H_u}^2\simeq m_{H_d}^2<0$ at the intermediate scale.

   hep-phhep-exJHEP(2020)·16 citations
6. 06*

   Searching for Millicharged Particles with Superconducting Radio-Frequency Cavities

   Asher Berlin🇺🇸 · Anson Hook🇺🇸

   We demonstrate that superconducting radio-frequency cavities can be used to create and detect millicharged particles and are capable of extending the reach to couplings several orders of magnitude beyond other laboratory based constraints. Millicharged particles are Schwinger pair-produced in driven cavities and quickly accelerated out of the cavity by the large electric fields. The electric current generated by these particles is detected by a receiver cavity. A light-shining-through-walls experiment may only need to reanalyze future data to provide new constraints on millicharged particles.

   hep-phhep-exPRD(2020)·18 citations
7. 07*

   Into the conformal window: multi-representation gauge theories

   Byung Su Kim🇰🇷 · Deog Ki Hong🇰🇷 · Jong-Wan Lee🇰🇷

   We investigate the conformal window of four-dimensional gauge theories with fermionic matter fields in multiple representations. Of particularly relevant examples are the ultra-violet complete models with fermions in two distinct representations considered in the context of composite Higgs and top partial-compositeness. We first discuss various analytical approaches to unveil the lower edge of the conformal window and their extension to the multiple matter representations. In particular, we argue that the scheme-independent series expansion for the anomalous dimension of a fermion bilinear at an infrared fixed point, ${\gamma }_{\bar{\chi }\chi ,\mathrm{IR}}$, combined with the conjectured critical condition, ${\gamma }_{\bar{\chi }\chi ,\mathrm{IR}}=1$ or equivalently ${\gamma }_{\bar{\chi }\chi ,\mathrm{IR}}(2-{\gamma }_{\bar{\chi }\chi ,\mathrm{IR}})=1$, can be used to determine the boundary of conformal phase transition on fully physical grounds. In illustrative cases of $SU(2)$ and $SU(3)$ theories with $N_R$ Dirac fermions in various representations, we assess our results by comparing to other analytical or lattice results.

   hep-phhep-lathep-thPRD(2020)·32 citations
8. 08*

   Computer modeling of production cross sections for beyond SM particles

   Tetiana Obikhod🇺🇦 · Ievgenii Petrenko🇺🇦

   In the paper is presented computer modelling of BSM physics, such as Dark matter candidates, di-jet resonances and new Higgs bosons with the help of MCFM program.

   hep-phPhys.Part.Nucl.(2022)·0 citations
9. 09*

   Quantum delocalization of strings with boundary action in Yang-Mills theory

   A. S. Bakry🇨🇳 · M. A. Deliyergiyev🇵🇱 · A. A. Galal🇪🇬 · A. M. Khalaf🇪🇬 · M. Khalil William

   The width of the quantum delocalization of the QCD strings is investigated in effective string models beyond free Nambu-Goto approximation. We consider two Lorentzian-invariant boundary-terms in the Lüscher-Weisz string action in addition to self-interaction term equivalent to two loop order in the (NG) string action. The geometrical terms which realize the possible rigidity of the QCD string is scrutinized as well. We perform the numerical analysis on the 4-dim pure $SU(3)$ Yang-Mills lattice gauge theory at two temperature scales near deconfinement point. The comparative study with this QCD string model targets the width of the energy profile of a static quark-antiquark system for color sources separation $0.5\le R\le 1.2$ fm. We find the inclusion of rigidity properties and symmetry effects of the boundary action into the string paradigm to reproduce a good match with the profile of the Mont-Carlo data of QCD flux-tube on this distance scale.

   ↳ hep-lathep-phhep-thnucl-th7 citations
10. 10*

    Cosmological Evolution of Two-Scalar fields Cosmology in the Jordan frame

    Alex Giacomini🇨🇱 · Genly Leon🇨🇱 · Andronikos Paliathanasis🇿🇦 · Supriya Pan🇮🇳

    In the present article we study the cosmological evolution of a two-scalar field gravitational theory defined in the Jordan frame. Specifically, we assume one of the scalar fields to be minimally coupled to gravity, while the second field which is the Brans-Dicke scalar field is nonminimally coupled to gravity and also coupled to the other scalar field. In the Einstein frame this theory reduces to a two-scalar field theory where the two fields can interact only in the potential term, which means that the quintom theory is recovered. The cosmological evolution is studied by analyzing the equilibrium points of the field equations in the Jordan frame. We find that the theory can describe the cosmological evolution in large scales, while inflationary solutions are also provided.

    ↳ gr-qcastro-ph.COhep-phEPJC(2020)·24 citations
11. 11*

    Signature of Collective Plasma Effects in Beam-Driven QED Cascades

    Kenan Qu🇺🇸 · Sebastian Meuren🇺🇸 · Nathaniel J. Fisch🇺🇸

    QED cascades play an important role in extreme astrophysical environments like magnetars. They can also be produced by passing a relativistic electron beam through an intense laser field. Signatures of collective pair plasma effects in these QED cascades are shown to appear, in exquisite detail, through plasma-induced frequency upshifts in the laser spectrum. Remarkably, these signatures can be detected even in small plasma volumes moving at relativistic speeds. Strong-field quantum and collective pair plasma effects can thus be explored with existing technology, provided that ultra-dense electron beams are colocated with multi-PW lasers.

    ↳ physics.plasm-phhep-phPRL(2021)·38 citations
12. 12*

    GPD Physics With Polarized Muon Beams at COMPASS-II

    A. Ferrero (for the COMPASS Collaboration)🇫🇷

    A major part of the future COMPASS program is dedicated to the investigation of the nucleon structure through Deeply Virtual Compton Scattering (DVCS) and Deeply Virtual Meson Production (DVMP). COMPASS will measure DVCS and DVMP reactions with a high intensity muon beam of 160 GeV and a 2.5 m-long liquid hydrogen target surrounded by a new TOF system. The availability of muon beams with high energy and opposite charge and polarization will allow to access the Compton form factor related to the dominant GPD $H$ and to study the $x_B$-dependence of the $t$-slope of the pure DVCS cross section and to study nucleon tomography. Projections on the achievable accuracies and preliminary results of pilot measurements will be presented.

    ↳ hep-exhep-phAIP Conf.Proc.(2013)·6 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.