Mon·Mar 8, 2021Monday·March 8, 2021

1. 01*

   Extraction of the Sivers function from SIDIS, Drell-Yan, and $W^{\pm }/Z$ boson production data with TMD evolution

   Marcin Bury🇩🇪 · Alexei Prokudin🇺🇸 · Alexey Vladimirov🇩🇪

   We perform a global fit of the available polarized Semi-Inclusive Deep Inelastic Scattering (SIDIS), polarized pion-induced Drell-Yan (DY) and $W^{\pm }/Z$ boson production data at N${}^3$LO and NNLO accuracy of the Transverse Momentum Dependent (TMD) evolution, and extract the Sivers function for $u$, $d$, $s$ and for sea quarks. The Qiu-Sterman function is determined in a model independent way via the operator product expansion from the extracted Sivers function. The analysis is supplemented by additional studies, such as the estimation of applicability region, the impact of the unpolarized distributions' uncertainties, the universality of the Sivers functions, positivity constraints, the significance of the sign-change relation, and the comparison with the existing extractions

   hep-phhep-exnucl-thJHEP(2021)·79 citations
2. 02*

   Earth-skimming Ultra-high Energy Tau Neutrinos simulated with MonteCarlo method and CONEX code

   Bouzid Boussaha🇩🇿 · Tariq Bitam🇩🇿

   This paper aims to study the feasibility of building an Earth-skimming cosmic tau neutrinos detector, with the aim of eventually identifying the ideal dimensions of a natural site (mountainvalley) for the detection, with the energy range to be determined (evidently, the highest possible numbers range from 1015 eV to 1020 eV), and possibly locate one such site in Algeria. First, a Monte Carlo simulation of the neutrino-[mountain]matter interaction as well as the resulting decay of the tau lepton is conducted to determine the optimal dimensions of the mountain as well as the location of the tau decay in the valley. Second, a CORSIKA (COsmic Ray Simulation for KAscade) [1] simulation with the CONEX option is conducted to track the evolution of the almost horizontal air shower born from the tau lepton. Among the particles produced in the shower are: electrons, muons, gammas, pions, etc). The study of the spatial distribution of these particles enables the discovery of the optimal width of the valley, and consequently, the distance at which to lay the detection network.

   hep-phastro-ph.HEAdv.High Energy Phys.(2021)·1 citation
3. 03*

   Entropy production due to electroweak phase transition in the framework of two Higgs doublet model

   Arnab Chaudhuri🇷🇺 · Maxim Yu. Khlopov🇷🇺

   We revisit the possibility of first order electroweak phase transition~(EWPT) in one of the simplest extensions of the Standard Model (SM) scalar sector, namely the two-Higgs-doublet model~(2HDM). We take into account the ensuing constraints from the electroweak precision tests, Higgs signal strengths, and the recent LHC bounds from direct scalar searches. By studying the vacuum transition in 2HDM, we discuss in detail the entropy released in the first order EWPT in various parameter planes of 2HDM.

   hep-phastro-ph.COMDPI Physics(2021)·9 citations
4. 04*

   Searching for heavy neutrino in terms of tau lepton at future hadron collider

   Chengcheng Han🇨🇳 · Tong Li🇨🇳 · Chang-Yuan Yao🇨🇳

   The tau lepton plays important role in the correlation between the low-energy neutrino oscillation data and the lepton flavor structure in heavy neutrino decay. We investigate the lepton flavor signatures with tau lepton at hadron collider through lepton number violating (LNV) processes. In the Type I Seesaw with U$(1{)}_{\mathrm{B}-\mathrm{L}}$ extension, we study the pair production of heavy neutrinos via a $Z^{\prime }$ resonance. We present a detailed assessment of the search sensitivity to the channels with tau lepton in the subsequent decay of heavy neutrinos. For the benchmark model with $Z^{\prime }$ only coupled to the third generation fermions, we find that the future circular collider (FCC-hh) can discover the LNV signal with tau lepton for $M_{Z^{\prime }}$ up to 2.2 (3) TeV with the gauge coupling $g^{\prime }=0.6$ and the integrated luminosity of 3 (30) ab${}^{-1}$. The test on the flavor combinations of SM charged leptons would reveal the specific nature of different heavy neutrinos.

   hep-phPRD(2021)·12 citations
5. 05*

   Revisiting the role of CP-conserving processes in cosmological particle-antiparticle asymmetries

   Avirup Ghosh🇮🇳 · Deep Ghosh🇮🇳 · Satyanarayan Mukhopadhyay🇮🇳

   We point out qualitatively different possibilities on the role of CP-conserving processes in generating cosmological particle-antiparticle asymmetries, with illustrative examples from models in leptogenesis and asymmetric dark matter production. In particular, we consider scenarios in which the CP-violating and CP-conserving processes are either both decays or both scatterings, thereby being naturally of comparable rates. This is in contrast to the previously considered CP-conserving processes in models of leptogenesis in different see-saw mechanisms, in which the CP-conserving scatterings typically have lower rates compared to the CP-violating decays, due to a Boltzmann suppression. We further point out that the CP-conserving processes can play a dual role if the asymmetry is generated in the mother sector itself, in contrast to the conventional scenarios in which it is generated in the daughter sector. This is because, the CP-conserving processes initially suppress the asymmetry generation by controlling the out-of-equilibrium number densities of the bath particles, but subsequently modify the ratio of particle anti-particle yields at the present epoch by eliminating the symmetric component of the bath particles through pair-annihilations, leading to a competing effect stemming from the same process at different epochs. We find that the asymmetric yields for relevant particle-antiparticle systems can vary by orders of magnitude depending upon the relative size of the CP-conserving and violating reaction rates.

   hep-phastro-ph.COEPJC(2021)·6 citations
6. 06*

   Freezing In with Lepton Flavored Fermions

   Giancarlo D'Ambrosio🇮🇹 · Shiuli Chatterjee🇮🇳 · Ranjan Laha🇮🇳 · Sudhir K. Vempati🇮🇳

   Dark, chiral fermions carrying lepton flavor quantum numbers are natural candidates for freeze-in. Small couplings with the Standard Model fermions of the order of lepton Yukawas are `automatic' in the limit of Minimal Flavor Violation. In the absence of total lepton number violating interactions, particles with certain representations under the flavor group remain absolutely stable. For masses in the GeV-TeV range, the simplest model with three flavors, leads to signals at future direct detection experiments like DARWIN. Interestingly, freeze-in with a smaller flavor group such as $SU(2)$ is already being probed by XENON1T.

   hep-phastro-ph.COhep-exSciPost Phys.(2021)·7 citations
7. 07*

   Modified equilibrium distributions for Cooper--Frye particlization

   M. McNelis🇺🇸 · U. Heinz🇺🇸

   We introduce a positive definite single-particle distribution that is suitable for describing the transition from a macroscopic hydrodynamic to a microscopic kinetic description during the late stages of heavy-ion collisions in the presence of moderately large viscous corrections. The modified equilibrium distribution function can be constructed with hydrodynamic input from either relativistic viscous fluid dynamics or anisotropic fluid dynamics. We test the modified equilibrium distribution's hydrodynamic output for a stationary hadron resonance gas subject to either shear stress, bulk pressure, or baryon diffusion current at a given freeze-out temperature and baryon chemical potential. While it does not reproduce all components of the net baryon current and energy-momentum tensor exactly, it significantly improves upon the customary linearized approximations for the non-equilibrium correction $\delta f_n$ which typically lead to unphysical negative distribution functions at large particle momenta. A comparison of particle spectra and $p_T$-differential elliptic flow coefficients from the Cooper-Frye formula computed with the modified equilibrium distribution and with linearized $\delta f_n$ corrections is presented, for two different (2+1)-dimensional hypersurfaces corresponding to central and non-central Pb+Pb collisions at the Large Hadron Collider (LHC).

   ↳ nucl-thhep-phPRC(2021)·34 citations
8. 08*

   Spherically Symmetric Chromostatic Condensates as an Introduction to the Strong Conjecture for Color Confinement

   Dennis Sivers🇺🇸

   Nonlinearities imbedded in the Lagrange density for non-Abelian gauge theories produce solutions to the Yang-Mills Maxwell equations that describe spatially extended chromostatic condensates. For solutions in spherically-symmetric SU(2) the topological structures separating such condensates provide a specific solitonic description of color confinement. The strong Conjecture The confinement mechanism for QCD involves a domain wall of topological (CP-odd) charge separating the interior volume of hadrons from an exterior volume. To explain the consequences of this conjecture we describe spherically symmetric chromostatic condensates that are consistent with the interior volume of a hadron and other condensates that are consistent with exterior vacuum volume. We then demonstrate how the Yang-Mills Maxwell equations can connect the two volumes with a soliton domain wall. The preliminary phenomenological description described here does not deal explicitly either with charged fermions or with the quantization of non-Abelian dynamics.

   ↳ hep-thhep-ph0 citations
9. 09*

   Cosmological Constraints on the Coupling Model from Observational Hubble Parameter and Baryon Acoustic Oscillation Measurements

   Shulei Cao🇺🇸 · Tong-Jie Zhang🇨🇳 · Xinya Wang🇺🇸 · Tingting Zhang🇨🇳

   In the paper, we consider two models in which dark energy is coupled with either dust matter or dark matter, and discuss the conditions that allow more time for structure formation to take place at high redshifts. These models are expected to have a larger age of the universe than that of $\Lambda$CDM [universe consists of cold dark matter (CDM) and dark energy (a cosmological constant, $\Lambda$)], so it can explain the formation of high redshift gravitationally bound systems which the $\Lambda$CDM model cannot interpret. We use the observational Hubble parameter data (OHD) and Hubble parameter obtained from cosmic chronometers method ($H(z)$) in combination with baryon acoustic oscillation (BAO) data to constrain these models. With the best-fitting parameters, we discuss how the age, the deceleration parameter, and the energy density parameters evolve in the new universes, and compare them with that of $\Lambda$CDM.

   ↳ astro-ph.COgr-qchep-phhep-thUniverse(2021)·19 citations
10. 10*

    Direct limits for scalar field dark matter from a gravitational-wave detector

    Sander M. Vermeulen🇬🇧 · Philip Relton🇬🇧 · Hartmut Grote🇬🇧 · Vivien Raymond🇬🇧 · Christoph Affeldt🇩🇪 · Fabio Bergamin🇩🇪 · Aparna Bisht🇩🇪 · Marc Brinkmann🇩🇪 · Karsten Danzmann🇩🇪 · Suresh Doravari🇩🇪 · Volker Kringel🇩🇪 · James Lough🇩🇪 and 11 other authors

    The nature of dark matter remains unknown to date; several candidate particles are being considered in a dynamically changing research landscape. Scalar field dark matter is a prominent option that is being explored with precision instruments, such as atomic clocks and optical cavities. Here we report on the first direct search for scalar field dark matter utilising a gravitational-wave detector, which operates beyond the quantum shot-noise limit. We set new upper limits for the coupling constants of scalar field dark matter as a function of its mass, by excluding the presence of signals that would be produced through the direct coupling of this dark matter to the beamsplitter of the GEO600 interferometer. The new constraints improve upon bounds from previous direct searches by more than six orders of magnitude, and are in some cases more stringent than limits obtained in tests of the equivalence principle by up to four orders of magnitude. Our work demonstrates that scalar field dark matter can be probed or constrained with direct searches using gravitational-wave detectors, and highlights the potential of quantum-enhanced interferometry for dark matter detection.

    ↳ gr-qchep-ph128 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.