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Nuclear Theory·nucl-th

Wednesday·May 25, 2022

8 papers—3 primary·5 cross-listed

All8Primary3Cross-lists5
  1. 04

    [Submitted on 23 May 2022] (cross-list from hep-ph)

    Improved indirect limits on charm and bottom quark EDMs

    Yohei Ema🇺🇸 · Ting Gao🇺🇸 · Maxim Pospelov🇺🇸

    We derive indirect limits on the charm and bottom quark electric dipole moments (EDMs) from paramagnetic AMO and neutron EDM experiments. The charm and bottom quark EDMs generate -odd photon-gluon operators and light quark EDMs at the - and -quark mass thresholds. These -odd operators induce the -odd semi-leptonic operator and the neutron EDM below the QCD scale that are probed by the paramagnetic and neutron EDM experiments, respectively. The bound from is for the charm quark and for the bottom quark, with its uncertainty estimated as 10%. The neutron EDM provides a stronger bound, and , though with a larger hadronic uncertainty.

    Comments:
    19 pages, 3 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    2205.11532 [pdf]
    JHEP(2022)·16 citations
  2. 05

    [Submitted on 23 May 2022] (cross-list from hep-ph)

    Fully-charm and -bottom pentaquarks in a Lattice-QCD inspired quark model

    Gang Yang🇨🇳 · Jialun Ping🇨🇳 · Jorge Segovia🇪🇸

    The fully-charm and -bottom pentaquarks, \emph{i.e.} and , with spin-parity quantum numbers , and , are investigated within a Lattice-QCD inspired quark model, which has already successfully described the recently announced fully-charm tetraquark candidate , and has also predicted several other fully-heavy tetraquarks. A powerful computational technique, based on the Gaussian expansion method combined with a complex-scaling range approach, is employed to predict, and distinguish, bound, resonance and scattering states of the mentioned five-body system. Both baryon-meson and diquark-diquark-antiquark configurations, along with all of their possible color channels are comprehensively considered. Narrow resonances are obtained in each spin-parity channel for the fully-charm and -bottom systems. Moreover, most of them seems to be compact multiquarks whose wave-functions are dominated by either hidden-color baryon-meson or diquark-diquark-antiquark structure, or by the coupling between them.

    Comments:
    12 pages, 7 figures, 12 tables
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2205.11548 [pdf]
    PRD(2022)·27 citations
  3. 06

    [Submitted on 23 May 2022] (cross-list from nucl-ex)

    Precision Determination of the Neutral Weak Form Factor of Ca

    D. Adhikari🇺🇸 · H. Albataineh🇺🇸 · D. Androic🇭🇷 · K.A. Aniol🇺🇸 · D.S. Armstrong🇺🇸 · T. Averett🇺🇸 · C. Ayerbe Gayoso🇺🇸 · S.K. Barcus🇺🇸 · V. Bellini🇮🇹 · R.S. Beminiwattha🇺🇸 · J.F. Benesch🇺🇸 · H. Bhatt🇺🇸 and 90 other authors

    We report a precise measurement of the parity-violating asymmetry in the elastic scattering of longitudinally polarized electrons from . We measure parts per billion, leading to an extraction of the neutral weak form factor fm and the charge minus the weak form factor . The resulting neutron skin thickness ~fm is relatively thin yet consistent with many model calculations. The combined CREX and PREX results will have implications for future energy density functional calculations and on the density dependence of the symmetry energy of nuclear matter.

    Comments:
    8 pages, 5 figures Replace 6-16-22: included ancillary files, corrected errors in references, author affiliations. Small text changes for clarity
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2205.11593 [pdf]
    PRL(2022)·374 citations
  4. 07

    [Submitted on 24 May 2022] (cross-list from quant-ph)

    QCSH: a Full Quantum Computer Nuclear Shell-Model Package

    Peng Lv🇨🇳 · Shi-Jie Wei🇨🇳 · Hao-Nan Xie🇨🇳 · Gui-Lu Long🇨🇳

    Nucleus is a typical many-body quantum system. Full calculation of a nuclear system in a classical computer is far beyond the capacity of current classical computers. With fast development of hardware, the prospect of using quantum computers in nuclear physics is closing. Here, we report a full quantum package, QCSH, for solving nuclear shell-model in a quantum computer. QCSH uses the linear combination of unitaries formalism of quantum computing, and performs all calculations in a quantum computer. The complexities of qubit resource, number of basic gates of QCSH, are both polynomial to the nuclear size. QCSH can already provide meaningful results in the near term. As examples, the binding energies of twelve light nuclei, H, H, He, He, Li, Li, C, N, O, O, Na and Ca are calculated using QCSH in a classical quantum emulator. The binding energy of Deuteron has already been experimentally studied using QCSH on a superconducting quantum computing device. QCSH not only works in near-term quantum devices, but also in future large-scale quantum computers. With the development of quantum devices, nuclear system constitutes another promising area for demonstrating practical quantum advantage.

    Subjects:
    Quantum Physics (quant-ph); Nuclear Theory (nucl-th)
    arXiv:
    2205.12087 [pdf]
    SCPMA(2023)·15 citations
  5. 08

    [Submitted on 24 May 2022] (cross-list from hep-ph)

    Towards a Stringy Description for the -Quark System

    Oleg Andreev🇷🇺

    For the case of two light flavors we propose the stringy description of the system made of one heavy and one light quark-antiquark pair, with the aim of exploring the two lower-lying Born-Oppenheimer potentials as a function of a separation of the heavy quark-antiquark pair. Our analysis reveals three critical separations related to the processes of string reconnection, breaking and junction annihilation. In particular, for the ground state potential only the process of string reconnection matters. We find that a tetraquark state makes the dominant contribution to the potential of the first excited state at small separations, and this is the big difference with the -quark system where it does so to the ground state potential. Another big difference is the emergence of the full diquark picture rather than the partial picture for the tetraquark state. On the other hand, the scales of string junction annihilation, below which the systems can be thought of mainly as the compact tetraquarks, are very close for both cases and become almost the same if the phenomenological rule holds. The same is also true for the screening lengths whose values are in agreement with lattice QCD.

    Comments:
    22 pages, many figures; v2: typos corrected; v3: improved discussion, references added; v4: typo corrected; v5: the sign in (3.23) corrected
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2205.12119 [pdf]
    PRD(2022)·13 citations

Affiliations

first authorsco-authorsvia INSPIRE