Mon·Apr 18, 2022Monday·April 18, 2022

1. 01*

   Schwinger pair production rate and time for some space-dependent electromagnetic fields via worldline instantons formalism

   Orkash Amat🇨🇳 · Li-Na Hu🇨🇳 · Adiljan Sawut🇨🇳 · Melike Mohamedsedik🇨🇳 · M. A. Bake🇨🇳 · B. S. Xie🇨🇳

   Schwinger pair production in some of space-dependent electromagnetic fields is studied analytically by using worldline instantons formalism for scalar quantum electrodynamics. With the increase of the modified Keldysh parameter ${\gamma }_{keb}$, the pair production rate decreases, the region of instanton paths expands regardless of the electromagnetic field form. We also find that all of the paths of the instantons for various electromagnetic fields are exactly in the same plane while with the different elliptical shapes. Moreover, the magnitudes of the normalized instantons action with different external electromagnetic fields are all bounded within the region from $\pi$ to $2\pi$ in spatial inhomogeneity fields. We further analytically identify and obtain two kinds of the pair-production time associated to the worldline instantons action.

   hep-phquant-ph11 citations
2. 02*

   Ditauonium spectroscopy

   David d'Enterria🇨🇭 · Redamy Perez-Ramos🇫🇷 · Hua-Sheng Shao🇫🇷

   We examine the properties of ditauonium, an exotic atom consisting of a pair of opposite-sign $\tau$ leptons bound together by the quantum electrodynamics (QED) interaction in a hydrogen-like state. The energy levels, decay modes and associated partial widths, as well as total widths and lifetimes of the ortho- and para-ditauonium states are calculated. Higher-order QED effects -- including Lamb shifts, hyperfine splitting structure, and partial decay widths corrections -- are incorporated up to approximately next-to-next-to-leading-order (NNLO) accuracy. Beyond the dominant diphoton and difermion decays, the rates of rare decay channels -- including Dalitz, radiative, triple-photon, double-Dalitz, four-fermion, and neutrinos final states -- are determined.

   hep-phhep-exEPJC(2022)·16 citations
3. 03*

   Systematic analysis of the proton mass radius based on photoproduction of vector charmoniums

   Xiao-Yun Wang🇨🇳 · Fancong Zeng🇨🇳 · Quanjin Wang🇨🇳

   In this work, the cross-section of the reaction $\gamma p\to V(J/\psi ,\psi (2S))p$ from the production threshold to medium energy is studied and systematically analyzed within two gluon exchange model. The obtained numerical results are in agreement with experimental data and other theoretical predictions. Under the assumption of the scalar form factor of dipole form, the value of proton mass radius is calculated as $0.55\pm 0.09$ fm and $0.77\pm 0.12$ fm from the fit to the predicted $J/\psi$ and $\psi (2S)$ differential cross-section, respectively. Finally the average value of proton mass radius is estimated to be $\sqrt{⟨R_m^2⟩}=0.67\pm 0.11$ fm. Moreover, one find that extracting mass radius from the near-threshold differential cross-section of heavy quarkoniums is always affected by large $|t{|}_{min}$. These obtained results may provide important theoretical reference for understanding of nucleon structure and future relevant experiments.

   hep-phPRD(2022)·27 citations
4. 04*

   Effect of right-handed currents and dark side of the solar neutrino parameter space to Neutrinoless Double Beta Decay

   Pritam Kumar Bishee🇮🇳 · Purushottam Sahu🇮🇳 · Sudhanwa Patra🇮🇳

   The Majorana nature of neutrinos will be the confirmed by the observation of the rare process called as neutrinoless double beta decay process, i.e. the simultaneous decay of two neutrons in the nucleus of an isotope (A, Z) into two protons and two electrons without the emission of any neutrinos i.e, $(A,Z)\to (A,Z+2)+2e^{-}$. The non-observation of such a decay so far has been interpreted as a lower limit on the half life of the isotope under investigation, which puts severe constraints on any new physics giving rise to LNV in the electron sector. On the other hand, the standard mechanism with normal ordering and inverted ordering can not saturate the present experimental limit while quasi-degenerate light neutrinos are strongly disfavored by the upper limits on the sum of light neutrino masses from cosmological data sets. In this work, we show that how dark side of the solar neutrino parameter space and effect of new physics contributions from right-handed currents can saturate the experimental limit provided by KamLAND-Zen and GERDA.

   hep-phSTUDENT JOURNAL OF PHYSICS 2018 Vol. 7, N…·0 citations
5. 05*

   A model explaining the new CDF II W boson mass linking to muon $g-2$ and dark matter

   Keiko I. Nagao🇯🇵 · Takaaki Nomura🇨🇳 · Hiroshi Okada🇰🇷

   We propose a model to explain the W boson mass anomaly reported by the CDFII collaboration that would suggest new physics (NP). We introduce exotic fermions; one isospin doublet vector-like lepton, one isospin singlet singly-charged vector-like lepton, and an isospin doublet inert scalar. The proposed model provides sizable muon anomalous magnetic moment (muon $g-2$) due to no chiral suppression and nonzero mass difference between the real and imaginary parts of neutral inert scalar bosons. The inert scalar mass squared difference and vector-like exotic leptons ($L^{\prime },E^{\prime }$ in the main text) affect oblique parameters. Especially, the $T$-parameter shift from zero explains the W boson mass anomaly. We search for the allowed parameter region to explain both muon $g-2$ and W boson mass anomaly at the same time. We also discuss a dark matter (DM) candidate assuming the real part of the inert scalar field to be the one. We find that lighter DM mass is favored to be consistent with experimental constraints.

   hep-phhep-exEur.Phys.J.Plus(2023)·63 citations
6. 06*

   Parton distributions: Functional complexity and Lorentz parametrization

   I.V. Anikin🇷🇺 · L. Szymanowski🇵🇱

   In the paper we focus on the study of the functional complexity of the Lorentz parametrizing functions in connection with the time-reversal transformations. We argue that the interactions encoded in the corresponding correlators of non-local quark(-gluon) operators generate additional sources of functional complexity for the parametrizing functions which are not discussed in the literature. We also revisit the Lorentz parametrization of different correlators given by the hadron matrix elements of the non-local operators. The evidences for the new parametrizing function existence have been presented.

   hep-phInt.J.Mod.Phys.A(2022)·3 citations
7. 07*

   Implication of the $W$ boson mass anomaly at CDF II in the Higgs triplet model with a mass difference

   Shinya Kanemura🇯🇵 · Kei Yagyu🇯🇵

   A new report for the measurement of the W boson mass has been provided by the CDF II experiment. The measured value of the W boson mass is given to be $m_W^{\text{CDF II}}=80.4335\pm 0.0094$ GeV which shows $7\sigma$ deviation from the standard model prediction, while the other groups of high energy experiments, e.g., ATLAS and D0 II, show consistent results with the latter. Assuming that the measurement at CDF II is correct, we discuss the possibility to explain the anomaly in the Higgs triplet model. We find that the anomaly can be explained under the constraints from the electroweak rho parameter, the effective weak mixing angle, the partial width of the leptonic $Z$ decay and current direct searches at LHC when non-zero mass differences among the triplet-like Higgs bosons and the vacuum expectation value of the triplet Higgs field are taken to be $\mathcal{O}(100)$ GeV and $\mathcal{O}(1)$ GeV, respectively.

   hep-phPLB(2022)·88 citations
8. 08*

   Gravitational waves and monopoles dark matter from first-order phase transition

   Jing Yang🇨🇳 · Ruiyu Zhou🇨🇳 · Ligong Bian🇨🇳

   We study the possibility of monopoles serving as dark matter when they are produced during the first-order phase transition in the dark sector. Our study shows that dark monopoles can contribute only a small piece of dark matter relic density within parameter spaces where strong gravitational waves can be probed by ET and CE, and the monopoles can contribute a sizable component of the observed dark matter relic density for fast phase transitions with short duration.

   hep-phastro-ph.COPLB(2023)·12 citations
9. 09*

   Neutral-Current Electroweak Physics and SMEFT Studies at the EIC

   Radja Boughezal🇺🇸 · Alexander Emmert🇺🇸 · Tyler Kutz🇺🇸 · Sonny Mantry🇺🇸 · Michael Nycz🇺🇸 · Frank Petriello🇺🇸 · Kağan Şimşek🇺🇸 · Daniel Wiegand🇺🇸 · Xiaochao Zheng🇺🇸

   We study the potential for precision electroweak (EW) measurements and beyond-the-Standard Model (BSM) searches using cross-section asymmetries in neutral-current (NC) deep inelastic scattering at the electron-ion collider (EIC). Our analysis uses a complete and realistic accounting of systematic errors from both theory and experiment and considers the potential of both proton and deuteron beams for a wide range of energies and luminosities. We also consider what can be learned from a possible future positron beam and a potential ten-fold luminosity upgrade of the EIC beyond its initial decade of running. We use the SM effective field theory (SMEFT) framework to parameterize BSM effects and focus on semi-leptonic four-fermion operators, whereas for our precision EW study, we determine how well the EIC can measure the weak mixing angle. New features of our study include the use of an up-to-date detector design of EIC Comprehensive Chromodynamics Experiment (ECCE) and accurate running conditions of the EIC, the simultaneous fitting of beam polarization uncertainties and Wilson coefficients to improve the sensitivity to SMEFT operators, and the inclusion of the weak mixing angle running in our fit template. We find that the EIC can probe BSM operators at scales competitive with and in many cases exceeding LHC Drell-Yan bounds while simultaneously not suffering from degeneracies between Wilson coefficients.

   hep-phhep-exnucl-thPRD(2022)·46 citations
10. 10*

    Archimedean Lever Leptogenesis

    Djuna Croon🇬🇧 · Hooman Davoudiasl🇺🇸 · Rachel Houtz🇬🇧

    We propose that weak scale leptogenesis via $\sim 10$ TeV scale right-handed neutrinos could be possible if their couplings had transitory larger values in the early Universe. The requisite lifted parameters can be attained if a light scalar $\varphi$ is displaced a long distance from its origin by the thermal population of fermions $X$ that become massive before electroweak symmetry breaking. The fermion $X$ can be a viable dark matter candidate; for suitable choice of parameters, the light scalar itself can be dark matter through a misalignment mechanism. We find that a two-component DM population made up of both $X$ and $\varphi$ is a typical outcome in our framework.

    hep-phPRD(2022)·15 citations
11. 11*

    Visible Energy Alternative to Dark Energy

    Maryam Roushan🇮🇷 · Narges Rashidi🇮🇷 · Kourosh Nozari🇮🇷

    Quantum gravitational effects usually are assumed to be important on small scale (Planck scale), but actually these effects are also very significant on large (cosmological) scales. It is recognized that in curved spacetime, the existence of a minimal measurable momentum is inevitable. In this paper, we study thermodynamic properties of the late time universe in the presence of a minimal measurable momentum cutoff that encodes infra-red modification of the underlying field theory. In this regard, we consider a non-relativistic regime and show that the existence of a minimal measurable momentum in the very essence of the theory leads to accelerating expansion of the universe, which can be interpreted as an alternative to Dark Energy. The universe in this model has experienced the phantom line crossing in the near past.

    ↳ gr-qcastro-ph.COhep-phhep-thChin.J.Phys.(2022)·5 citations
12. 12*

    Cumulants of conserved charges in hydrodynamic simulations

    Renan Hirayama🇩🇪 · Frederique Grassi🇧🇷 · Willian Matioli Serenone🇧🇷 · Jean-Yves Ollitrault🇫🇷

    We introduce a fast and simple method of computing cumulants of net-proton or net-charge fluctuations in event-by-event hydrodynamic simulations of heavy-ion collisions. One evaluates the mean numbers of particles in every hydrodynamic event. Cumulants are then expressed as a function of these mean numbers. We implement the corrections due to global conservation laws. The method is tested using ideal hydrodynamic simulations of Au+Au collisions at $\sqrt{s_{NN}}=200$ AGeV with the NeXSPheRIO code. Results are in good agreement with experimental data on net-proton and net-charge fluctuations by the STAR collaboration.

    ↳ nucl-thhep-exhep-phnucl-exPRC(2023)·5 citations
13. 13*

    The gravitational wave and short gamma-ray burst GW170817/SHB170817A, not your everyday binary neutron star merger

    A. De Rújula🇪🇸

    This event, so far unique, beautifully confirmed the standard views on the gravitational waves produced by a merger of two neutron stars, but its electromagnetic multi-wavelenth observations disagreed with the numerous initial versions of the "standard fireball model(s)" of gamma ray bursts. Contrariwise, they provided strong evidence in favour of the "cannonball" model. Most uncontroversially, a cannonball was observed at radio wavelengths, with an overwhelming statistical significance ($>17\sigma$), and travelling in the plane of the sky, as expected, at an apparent superluminal velocity $V_{app}\sim 4c$.

    ↳ astro-ph.HEhep-ph2 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.