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Nuclear Theory·nucl-th

Wednesday·May 3, 2023

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 05

    [Submitted on 30 Apr 2023] (cross-list from hep-ph)

    Bayesian Inference of Supernova Neutrino Spectra with Multiple Detectors

    Xu-Run Huang🇨🇳 · Chuan-Le Sun🇨🇳 · Lie-Wen Chen🇨🇳 · Jun Gao🇨🇳

    We implement the Bayesian inference to retrieve energy spectra of all neutrinos from a galactic core-collapse supernova (CCSN). To achieve high statistics and full sensitivity to all flavours of neutrinos, we adopt a combination of several reaction channels from different large-scale neutrino observatories, namely inverse beta decay on proton and elastic scattering on electron from Hyper-Kamiokande (Hyper-K), charged current absorption on Argon from Deep Underground Neutrino Experiment (DUNE) and coherent elastic scattering on Lead from RES-NOVA. Assuming no neutrino oscillation or specific oscillation models, we obtain mock data for each channel through Poisson processes with the predictions, for a typical source distance of 10 kpc in our Galaxy, and then evaluate the probability distributions for all spectral parameters of theoretical neutrino spectrum model with Bayes' theorem. Although the results for either the electron-neutrinos or electron-antineutrinos reserve relatively large uncertainties (according to the neutrino mass hierarchy), a precision of a few percent (i.e., at a credible interval of ) is achieved for primary spectral parameters (e.g., mean energy and total emitted energy) of other neutrino species. Moreover, the correlation coefficients between different parameters are computed as well and interesting patterns are found. Especially, the mixing-induced correlations are sensitive to the neutrino mass hierarchy, which potentially makes it a brand new probe to determine the neutrino mass hierarchy in the detection of galactic supernova neutrinos. Finally, we discuss the origin of such correlation patterns and perspectives for further improvement on our results.

    Comments:
    25 pages, 7 figures, 4 tables, published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2305.00392 [pdf]
    JCAP(2023)·10 citations
  2. 06

    [Submitted on 1 May 2023] (cross-list from hep-ph)

    Detecting the critical point through entanglement in Schwinger model

    Kazuki Ikeda🇺🇸 · Dmitri E. Kharzeev🇺🇸 · René Meyer🇩🇪 · Shuzhe Shi🇺🇸

    Using quantum simulations on classical hardware, we study the phase diagram of the massive Schwinger model with a -term at finite chemical potential . We find that the quantum critical point in the phase diagram of the model can be detected through the entanglement entropy and entanglement spectrum. As a first step, we chart the phase diagram using conventional methods by computing the dependence of the charge and chiral condensates on the fermion mass , coupling constant , and the chemical potential . At zero density, the Schwinger model possesses a quantum critical point at and . We find that the position of this quantum critical point depends on the chemical potential. Near this quantum critical point, we observe a sharp maximum in the entanglement entropy. Moreover, we find that the quantum critical point can be located from the entanglement spectrum by detecting the position of the gap closing point.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Strongly Correlated Electrons (cond-mat.str-el); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    2305.00996 [pdf]
    PRD(2023)·36 citations
  3. 07

    [Submitted on 2 May 2023] (cross-list from physics.atom-ph)

    Effect of finite nuclear size on the electric quadrupole hyperfine operator

    V. A. Dzuba · V. V. Flambaum

    We present an expression for the operator of the electric quadrupole hyperfine interaction which takes into account finite nuclear size. We compare the results obtained with the use of this operator with those obtained in the standard approach which ignores finite nuclear size. We found that the effect of changing operators on the hyperfine constant is small in hydrogen-like systems. There is a very significant enhancement of the effect in many-electron atoms caused by the contribution of the large and off diagonal matrix elements to the core polarisation, correlation and configuration interaction corrections. Similar enhancement takes place for transition amplitudes induced by the electric quadrupole hyperfine interaction.

    Comments:
    4 pages, 1 figure
    Subjects:
    Atomic Physics (physics.atom-ph); Nuclear Theory (nucl-th)
    arXiv:
    2305.01208 [pdf]
    0 citations
  4. 08

    [Submitted on 2 May 2023] (cross-list from hep-ph)

    Dynamics in near-threshold photoproduction

    JPAC Collaboration: D. Winney🇨🇳 · C. Fernandez-Ramirez🇪🇸 · A. Pilloni🇮🇹 · A. N. Hiller Blin🇩🇪 · M. Albaladejo🇪🇸 · L. Bibrzycki🇵🇱 · N. Hammoud🇵🇱 · J. Liao🇺🇸 · V. Mathieu🇪🇸 · G. Montana🇺🇸 · R. J. Perry🇪🇸 · V. Shastry🇺🇸 · W. A. Smith🇺🇸 · A. P. Szczepaniak🇺🇸

    The study of photoproduction at low energies has consequences for the understanding of multiple aspects of nonperturbative QCD, ranging from mechanical properties of the proton, to the binding inside nuclei, and the existence of hidden-charm pentaquarks. Factorization of the photon- and nucleon dynamics or Vector Meson Dominance are often invoked to justify these studies. Alternatively, open charm intermediate states have been proposed as the dominant mechanism underlying photoproduction. As the latter violates this factorization, it is important to estimate the relevance of such contributions. We analyse the latest differential and integrated photoproduction cross sections from the GlueX and -007 experiments. We show that the data can be adequately described by a small number of partial waves, which we parameterize with generic models enforcing low-energy unitarity. The results suggest a nonnegligible contribution from open charm intermediate states. Furthermore, most of the models present an elastic scattering length incompatible with previous extractions based on Vector Meson Dominance, and thus call into question its applicability to heavy mesons. Our results indicate a wide array of physics possibilities that are compatible with present data and need to be disentangled.

    Comments:
    15 pages, 7 figures, 2 tables. Version to appear on Phys. Rev. D
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    2305.01449 [pdf]
    PRD(2023)·61 citations

Affiliations

first authorsco-authorsvia INSPIRE