Wed·Aug 18, 2021Wednesday·August 18, 2021

1. 01*

   The physics potential of a reactor neutrino experiment with Skipper-CCDs: Searching for new physics with light mediators

   G. Fernandez-Moroni🇺🇸 · R. Harnik🇺🇸 · P. A. N. Machado🇺🇸 · I. Martinez-Soler🇺🇸 · Y. F. Perez-Gonzalez🇺🇸 · D. Rodrigues🇺🇸 · S. Rosauro-Alcaraz🇪🇸

   We explore the sensitivity to new physics of the recently proposed vIOLETA experiment: a 10 kg Skipper Charged Coupled Device detector deployed 12 meters away from a commercial nuclear reactor core. We investigate two broad classes of models which benefit from the very low energy recoil threshold of these detectors, namely neutrino magnetic moments and light mediators coupled to neutrinos and quarks or electrons. We find that this experimental setup is very sensitive to light, weakly coupled new physics, and in particular that it could probe potential explanations of the event excess observed in XENON1T. We also provide a detailed study on the dependence of the sensitivity on the experimental setup assumptions and on the neutrino flux systematic uncertainties.

   hep-phhep-exJHEP(2022)·26 citations
2. 02*

   Sterile neutrinos in ${\Lambda }_b^0\to ({\Lambda }_c^{+},p^{+}){\ell }_1^{-}{\ell }_2^{-}{\ell }_3^{+}\nu$ decays

   Diganta Das🇮🇳 · Jaydeb Das🇮🇳

   We study lepton number violating and lepton number conserving semi-leptonic decays of heavy baryons ${\Lambda }_b^0$ to three charged leptons and a neutrino. The decays occur through two intermediate quasi-degenerate GeV-scale sterile neutrinos of either Majorana or Dirac type that can be on-shell. Interference between the intermediate heavy neutrinos leads to CP violation in the final states. Effect of neutrino oscillations between the heavy states are also considered in observables of interests, \emph{i.e.,} branching ratio, and the CP-asymmetry. Given the present constraints on the heavy-to-light mixing elements $|V_{eN}|$ and $|V_{\mu N}|$, CP-averaged branching ratio of ${\Lambda }_b^0\to ({\Lambda }_c,p)\mu \mu e\nu$ with intermediate Majorana neutrinos is almost two orders of magnitude larger than for the same with Dirac neutrinos, whereas, CP-averaged branching ratio of ${\Lambda }_b^0\to ({\Lambda }_c,p)ee\mu \nu$ is of the same order of magnitude for both Majorana and Dirac neutrino induced decays. CP-violation is found to be appreciable when the neutrino mass difference is comparable with the average decay widths.

   hep-phPRD(2022)·7 citations
3. 03*

   Sterile neutrino dark matter with dipole interaction

   Wonsub Cho🇰🇷 · Ki-Young Choi🇰🇷 · Osamu Seto🇯🇵

   We consider the possibility of the lightest sterile neutrino dark matter which has dipole interaction with heavier sterile neutrinos. The lifetime can be long enough to be a dark matter candidate without violating other constraints and the correct amount of relic abundance can be produced in the early Universe. We find that a sterile neutrino with the mass of around MeV and the dimension-five non-renormalisable dipole interaction suppressed by ${\Lambda }_5\gtrsim 10^{15}$ GeV can be a good candidate of dark matter, while heavier sterile neutrinos with masses of the order of GeV can explain the active neutrino oscillations.

   hep-phastro-ph.COPRD(2022)·13 citations
4. 04*

   Effective connections of $a_{\mu }$, Higgs physics, and the collider frontier

   Anisha🇮🇳 · Upalaparna Banerjee🇮🇳 · Joydeep Chakrabortty🇮🇳 · Christoph Englert🇬🇧 · Michael Spannowsky🇬🇧 · Panagiotis Stylianou🇬🇧

   We consider scalar extensions of the SM and their effective field theoretic generalisations to illustrate the phenomenological connection between precision measurements of the anomalous magnetic moment of the muon $a_{\mu }$, precision Higgs measurements, and direct collider sensitivity. To this end, we consider charged BSM scalar sectors of the Zee-Babu type for which we develop a consistent, and complete dimensions-5 and -6 effective field theory extension. This enables us to track generic new physics effects that interact with the SM predominantly via radiative interactions. While the operator space is high dimensional, the intersection of exotics searches at the Large Hadron Collider, Higgs signal strength and anomalous muon magnetic measurements is manageably small. We find that consistency of LHC Higgs observations and $a_{\mu }$ requires a significant deformation of the new states' electroweak properties. Evidence in searches for doubly charged scalars as currently pursued by the LHC experiments can be used to further tension the BSMEFT parameter space and resolve blind directions in the EFT-extended Zee-Babu scenario.

   hep-phhep-exPRD(2022)·5 citations
5. 05*

   On the role of the subsidiary fields in the momentum and angular momentum in covariantly quantized QED and QCD

   Elliot Leader🇬🇧

   The covariant quantization of QED and QCD requires the introduction of subsidiary gauge-fixing and ghost fields and it is crucial to understand the role of these in the energy-momentum tensor, and in the momentum and angular momentum operators. These issues were studied in \cite{Leader:2011za}, and key results from this study were utilized in the major review of angular momentum in \cite{Leader:2013jra}. Damski \cite{Damski:2021feu} has rightly criticized as incorrect the derivation of certain equations in \cite{Leader:2011za}. We show, however, that the key results of \cite{Leader:2011za} which are utilized in \cite{Leader:2013jra} are unaffected by Damski's criticism.

   hep-phhep-thPRD(2022)·5 citations
6. 06*

   Longitudinal and transverse polarizations of $\Lambda$ hyperon in unpolarized SIDIS and $e^{+}{e}^{-}$ annihilation

   Kai-bao Chen🇨🇳 · Zuo-tang Liang🇨🇳 · Yu-kun Song🇨🇳 · Shu-yi Wei🇮🇹

   We make a systematic study of $\Lambda$ hyperon polarizations in unpolarized lepton induced semi-inclusive reactions such as $e^{-}N\to e^{-}\Lambda X$ and $e^{+}{e}^{-}\to \Lambda hX$. We present the general form of cross sections in terms of structure functions obtained from a general kinematic analysis. This already shows that the produced hyperons can be polarized in three orthogonal directions, i.e., the longitudinal direction along the hyperon momentum, the normal direction of the production plane, and the transverse direction in the production plane. We present the parton model results at the leading twist and leading order in perturbative QCD and provide the expressions for these structure functions and polarizations in terms of parton distribution functions and fragmentation functions. We emphasize in particular that by studying the longitudinal polarization and the transverse polarization in the production plane, we can extract the corresponding chiral-odd fragmentation functions $H_{1Lq}^{\perp \Lambda }$, $H_{1Tq}^{\Lambda }$ and $H_{1Tq}^{\perp \Lambda }$. We also present numerical results of rough estimates utilizing available parameterizations of fragmentation functions and approximations. We discuss how to measure these polarizations and point out in particular that they can be carried out in future EIC and/or $e^{+}{e}^{-}$ annihilation experiments such as Belle.

   hep-phhep-exnucl-exPRD(2022)·26 citations
7. 07*

   Dark Matter Freeze-out in a Matter Dominated Universe

   Saleh Hamdan🇺🇸

   The universe has evolved through several phases as its various constituents dominated its energy content. Candidate dark matter particles may have undergone freeze-out during any such phase. While the standard freeze-out scenarios have been explored during the radiation-dominated era, and more recently during scalar field decay, this work extends the study of dark matter freeze-out to a potential early period during which the universe is matter-dominated and its evolution adiabatic. Decoupling during an adiabatic matter dominated era changes the freeze-out dynamics, since the Hubble rate is parametrically different for matter and radiation domination. Furthermore, for successful Big Bang Nucleosynthesis the state dominating the early universe energy density must decay, this dilutes (or repopulates) the dark matter. As a result, the masses and couplings required to match the observed dark matter relic density can differ signifcantly from radiation dominated freeze-out.

   hep-phastro-ph.CO1 citation
8. 08*

   Heavy flavor jet production and substructure in electron-nucleus collisions

   Hai Tao Li🇺🇸 · Ze Long Liu🇺🇸 · Ivan Vitev🇺🇸

   Deep inelastic scattering on nuclei at the Electron-Ion Collider will open new opportunities to investigate the structure of matter. Heavy flavor-tagged jets are complementary probes of the partonic composition and transport coefficients of large nuclei, but introduce a new mass scale that modifies the structure of parton showers and must be carefully accounted for in perturbative calculations. In the framework of soft-collinear effective theory with Glauber gluon interactions, we present the first calculation of inclusive charm-jet and bottom-jet cross sections in electron-nucleus collisions at next-to-leading order and compare them to the reference electron-proton case. We also show predictions for the heavy flavor-tagged jet momentum sharing distributions to further clarify the correlated in-medium modification of jet substructure.

   hep-phhep-exnucl-thPLB(2022)·30 citations
9. 09*

   Observational constraints on the massive neutrinos induced late-time cosmic acceleration

   Mohit K. Sharma🇮🇳 · Shibesh Kumar Jas Pacif🇮🇳 · Shynaray Myrzakul🇰🇿 · Zamzagul Shanina🇰🇿

   We study a scenario based upon a mass-less $\lambda {\varphi }^4$ theory coupled to massive neutrino matter with $Z_2$ symmetry using a conformal coupling, $A(\varphi )=1-\alpha {\varphi }^2/2M_{pl}^2;\alpha =M_{pl}^2/M^2$ where $M$ is a cut off mass. The chosen coupling generically leads to the spontaneous symmetry breaking at late times such that the field acquires non-zero mass, $m_{\varphi }=(\alpha {\Omega }_{0\nu }{)}^{1/2}{H}_0\ll H_0$ and rolls slowly around the true ground state which emerges after spontaneous symmetry breaking. For the statistical analysis, we utilize Pantheon+Multi-Cycle Treasury and OHD data sets. We find that even a small fraction of the neutrino matter density together with its coupling to the scalar field can actually make our model to behave like a weakly dynamical dark energy and have $\Lambda$CDM model as a limiting case.

   hep-phgr-qcPhys.Scripta(2022)·3 citations
10. 10*

    The strong CP problem and higher dimensional gauge theories

    Yuki Adachi🇯🇵 · C.S. Lim🇯🇵 · Nobuhito Maru🇯🇵

    We discuss a natural scenario to solve the strong CP problem in the framework of the higher dimensional gauge theory. An axion-like field $A_y$ has been built-in as the extra-space component of the higher dimensional gauge field. The coupling of $A_y$ with gluons is attributed to the radiatively induced "Chern-Simons" (CS) term. We adopt a toy model with some unknown gauge symmetry U(1)${}_X$. The CS term is obtained in two ways: first by a concrete 1-loop calculation and next by use of the Fujikawa's method to deal with the chiral anomaly in 4D space-time. The obtained results are identical, which implies that the radiative correction to the CS term is "1-loop exact" and is also free from UV-divergence even though the theory itself is non-renormalizable. As a novel feature of this scenario, such obtained CS term is no longer linear in the field $A_y$ as in the usually discussed CS term in 5D space-time but a periodic function of $A_y$, since $A_y$ has a physical meaning as the Wilson-loop phase. We argue how such novel feature of this scenario causes the modification of the ordinary solutions of the strong CP problem based on the axion fields.

    ↳ hep-thhep-phPTEP(2022)·3 citations
11. 11*

    High resolution calibration of the cosmic strings velocity dependent one-scale model

    J. R. C. C. C. Correia🇵🇹 · C. J. A. P. Martins🇵🇹

    The canonical velocity-dependent one-scale (VOS) model for cosmic string evolution must be calibrated using high resolution numerical simulations, We exploit our state of the art graphics processing unit accelerated implementation of the evolution of local Abelian-Higgs string networks to provide a detailed and statistically robust calibration of the VOS model. We rely on the largest set of high resolution simulations carried out to date, with a wide range of cosmological expansion rates, and explore the impact of key numerical parameters, including the dynamic range (comparing box sizes from $1024^3$ to $4096^3$), the lattice spacing, and the choice of numerical estimators for the string velocity. We explore the sensitivity of the VOS model parameters to these numerical parameters, with a particular emphasis on the observationally crucial loop chopping efficiency, and also identify key differences between the equation of state and conjugate momentum estimators for the string velocities, showing that the latter one is more reliable for fast expansion rates (while in Minkowski space the opposite has been previously shown). Finally, we briefly illustrate how our results impact observational constraints on cosmic strings.

    ↳ astro-ph.COgr-qchep-phPRD(2021)·18 citations
12. 12*

    Physics Opportunities with Meson Beams for EIC

    William J. Briscoe (GWU) · Michael Doring (GWU) · Helmut Haberzettl (GWU) · D. Mark Manley · (KSU) · Megumi Naruki (Kyoto University) · Greg Smith (JLab) · Igor Strakovsky (GWU) · Eric S. Swanson (University of Pittsburgh)

    Over the past two decades, meson photo- and electroproduction data of unprecedented quality and quantity have been measured at electromagnetic facilities worldwide. By contrast, the meson-beam data for the same hadronic final states are mostly outdated and largely of poor quality, or even non-existent, and thus provide inadequate input to help interpret, analyze, and exploit the full potential of the new electromagnetic data. To reap the full benefit of the high-precision electromagnetic data, new high-statistics data from measurements with meson beams, with good angle and energy coverage for a wide range of reactions, are critically needed to advance our knowledge in baryon and meson spectroscopy and other related areas of hadron physics. To address this situation, a state-of-the-art meson-beam facility needs to be constructed. The present letter summarizes unresolved issues in hadron physics and outlines the vast opportunities and advances that only become possible with such a facility.

    ↳ nucl-exhep-exhep-phnucl-th6 citations
13. 13*

    Quantum electrodynamic effects on the two-stream instability

    Antoine Bret🇪🇸

    We consider the quantum electrodynamic corrections to the two-stream instability. We find these corrections vanish at first order unless a guiding magnetic field ${\mathbf{B}}_0$ is considered. With respect to the classical version of the instability, quantum electrodynamic effects reduce the most unstable wave vector and its growth rate by a factor $\sqrt{1+\xi }$, with $\xi =\frac{\alpha }{9\pi }(B_0/B_{cr}{)}^2$, where $\alpha$ is the fine-structure constant and $B_{cr}$ the Schwinger critical magnetic field. Although derived for a cold system, these results are valid for the kinetic case. The results are valid in the range $\xi \ll 1$ and, actually, up to linear corrections in $\xi$.

    ↳ physics.plasm-phastro-ph.HEhep-phhep-thEPL(2021)·3 citations
14. 14*

    Towards an Optimal Estimation of Cosmological Parameters with the Wavelet Scattering Transform

    Georgios Valogiannis🇺🇸 · Cora Dvorkin🇺🇸

    Optimal extraction of the non-Gaussian information encoded in the Large-Scale Structure (LSS) of the universe lies at the forefront of modern precision cosmology. We propose achieving this task through the use of the Wavelet Scattering Transform (WST), which subjects an input field to a layer of non-linear transformations that are sensitive to non-Gaussianity in spatial density distributions through a generated set of WST coefficients. In order to assess its applicability in the context of LSS surveys, we apply the WST on the 3D overdensity field obtained by the Quijote simulations, out of which we extract the Fisher information in 6 cosmological parameters. It is subsequently found to deliver a large improvement in the marginalized errors on all parameters, ranging between $1.2-4\times$ tighter than the corresponding ones obtained from the regular 3D cold dark matter + baryon power spectrum, as well as a $50\%$ improvement over the neutrino mass constraint given by the marked power spectrum. Through this first application on 3D cosmological fields, we demonstrate the great promise held by this novel statistic and set the stage for its future application to actual galaxy observations.

    ↳ astro-ph.COhep-phPRD(2022)·128 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.