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Nuclear Theory·nucl-th

Tuesday·April 6, 2021

16 papers—9 primary·7 cross-listed

All16Primary9Cross-lists7
  1. 10

    [Submitted on 3 Apr 2021] (cross-list from hep-ph)

    Possible Assignment of Excited Light Vector Mesons

    Jie-Cheng Feng🇨🇳 · Xian-Wei Kang🇨🇳 · Qi-Fang Lü🇨🇳 · Feng-Shou Zhang🇨🇳

    We reanalyze the problems in the assignment of 3 and 4 light mesons, which have not yet been well established with the quark model. Regge trajectories and the decay model are used respectively to study the mass and width of the observed states and predict the missing ones. By comparing our calculations with the latest experiments, we suggest that the inconsistent data of may include two similar structures and . In addition, the problem of the assignment, with two observed states and , is investigated, with several possible explanations.

    Comments:
    10 pages, 9 tables, 6 figures, accepted for publication in PRD
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    2104.01339 [pdf]
    PRD(2021)·24 citations
  2. 11

    [Submitted on 5 Apr 2021] (cross-list from hep-ph)

    Coherent neutrino scattering and the Migdal effect on the quenching factor

    Jiajun Liao🇨🇳 · Hongkai Liu🇺🇸 · Danny Marfatia🇺🇸

    Recent measurements of the germanium quenching factor deviate significantly from the predictions of the standard Lindhard model for nuclear recoil energies below a keV. This departure may be explained by the Migdal effect in neutron scattering on germanium. We show that the Migdal effect on the quenching factor can mimic the signal of a light Z' or light scalar mediator in coherent elastic neutrino nucleus scattering experiments with reactor antineutrinos. It is imperative that the quenching factor of nuclei with low recoil energy thresholds be precisely measured close to threshold to avoid such confusion. This will also help in experimental searches of light dark matter.

    Comments:
    5 pages, 4 figures, 1 table. Version to appear in PRD
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2104.01811 [pdf]
    PRD(2021)·25 citations
  3. 12

    [Submitted on 5 Apr 2021] (cross-list from astro-ph.HE)

    Effects of dark matter on the in-spiral properties of the binary neutron stars

    H. C. Das🇮🇳 · Ankit Kumar🇮🇳 · S. K. Patra🇮🇳

    Using the relativistic mean-field model, we calculate the properties of binary neutron star (BNS) in the in-spiral phase. Assuming the dark matter (DM) particles are accreted inside the neutron star (NS) due to its enormous gravitational field, the mass , radius , tidal deformability and dimensionless tidal deformability are calculated at different DM fractions. The value of , , and decreases with the increase of DM percentage inside the NS. The in-spiral phase properties of the BNS are explored within the post-Newtonian (PN) formalism, as it is suitable up to the last orbits in the in-spiral phase. We calculate the strain amplitude of the polarization waveform and , (2,2) mode waveform , orbital phase , frequency of the gravitational wave and PN parameter with DM as an extra candidate inside the NS. The magnitude of , and are almost the same for all assumed forces; however, the in-spiral time duration in the last orbit is different. We find that the BNS with soft equation of state and a high fraction of DM sustains more time in their in-spiral phase. We suggest that one should take DM inside the NS when they modelling the in-spiral waveforms for the BNS systems.

    Comments:
    9 pages, 7 figures, 2 tables, accepted for publication in MNRAS
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    2104.01815 [pdf]
    MNRAS(2021)·57 citations
  4. 13

    [Submitted on 5 Apr 2021] (cross-list from hep-ph)

    First Saturation Correction in High Energy Proton-Nucleus Collisions: II. Single Inclusive Semi-Hard Gluon Production

    Ming Li🇺🇸 · Vladimir V. Skokov🇺🇸

    Exploiting recently obtained analytic solutions of classical Yang-Mills equations for higher order perturbations in the field of the dilute object (proton), we derive the complete first saturation correction to the single inclusive semi-hard gluon production in high energy proton-nucleus collisions by applying the Lehmann-Symanzik-Zimmermann reduction formula. We thus finalize the program started by Balitsky (see Ref.~\cite{Balitsky:2004rr}) and independently by Chirilli, Kovchegov and Wertepny (see Ref.~\cite{Chirilli:2015tea}) albeit using a very different approach to carry out our calculations. We extracted the functional dependence of gluon spectrum on the color charge densities of the colliding objects; thus our results can be used to evaluate complete first saturation correction to the double/multiple inclusive gluon productions.

    Comments:
    60 pages and 7 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2104.01879 [pdf]
    JHEP(2021)·14 citations
  5. 14

    [Submitted on 5 Apr 2021] (cross-list from cond-mat.quant-gas)

    Low-momentum interactions for ultracold Fermi gases

    M. Urban🇫🇷 · S. Ramanan🇮🇳

    We consider a two-component Fermi gas with a contact interaction from the BCS regime to the unitary limit. Starting from the idea that many-body effects should not depend on short-distance or high-momentum physics which is encoded in the s-wave scattering length, but only on momentum scales of the order of the Fermi momentum, we build effective low-momentum interactions that reproduce the scattering phase shifts of the contact interaction below some momentum cutoff. Inspired from recent successes of this method in nuclear structure theory, we use these interactions to describe the equation of state of the Fermi gas in the framework of Hartree-Fock-Bogliubov theory with perturbative corrections. In the BCS regime, there is a range of cutoffs where we obtain fully converged results. Near unitarity, convergence is not yet reached, but we obtain promising results for the ground-state energies close to the experimental ones. Limitations and possible extensions of the approach are discussed.

    Comments:
    11 pages, 4 figures; v2: minor changes
    Subjects:
    Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th)
    arXiv:
    2104.01901 [pdf]
    PRA(2021)·9 citations
  6. 15

    [Submitted on 5 Apr 2021] (cross-list from hep-lat)

    Quantum algorithms for transport coefficients in gauge theories

    Thomas D. Cohen🇺🇸 · Henry Lamm🇺🇸 · Scott Lawrence🇺🇸 · Yukari Yamauchi🇺🇸

    In the future, ab initio quantum simulations of heavy ion collisions may become possible with large-scale fault-tolerant quantum computers. We propose a quantum algorithm for studying these collisions by looking at a class of observables requiring dramatically smaller volumes: transport coefficients. These form nonperturbative inputs into theoretical models of heavy ions; thus, their calculation reduces theoretical uncertainties without the need for a full-scale simulation of the collision. We derive the necessary lattice operators in the Hamiltonian formulation and describe how to obtain them on quantum computers. Additionally, we discuss ways to efficiently prepare the relevant thermal state of a gauge theory.

    Comments:
    15 pages, 4 figures
    Subjects:
    High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    2104.02024 [pdf]
    PRD(2021)·83 citations
  7. 16

    [Submitted on 5 Apr 2021] (cross-list from nucl-ex)

    Determination of shear forces inside the proton

    V. D. Burkert🇺🇸 · L. Elouadrhiri🇺🇸 · F.X. Girod🇺🇸

    We report on the first determination of the shear forces quarks inside the proton from experimental data on deeply virtual Compton scattering. The maximum shear force of approximately 40 MeV/fm occurs near 0.6 fm from the proton center, indicating where confinement forces may be strongest. On the macroscopic scale of the earth surface, this force corresponds to the weight of a mass of about 650 kg. The shear forces in the proton reverse direction at r = 0.45 fm from the center.

    Comments:
    4 pages, 4 figures
    Subjects:
    Nuclear Experiment (nucl-ex); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2104.02031 [pdf]
    64 citations

Affiliations

first authorsco-authorsvia INSPIRE