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Nuclear Theory·nucl-th

Tuesday·March 15, 2022

10 papers—3 primary·7 cross-listed

All10Primary3Cross-lists7
  1. 04

    [Submitted on 13 Mar 2022] (cross-list from hep-ph)

    Helicity-dependent distribution of strange quarks in the proton from nonlocal chiral effective theory

    Fangcheng He🇨🇳 · Chueng-Ryong Ji🇺🇸 · W. Melnitchouk🇺🇸 · Y. Salamu🇨🇳 · A. W. Thomas🇦🇺 · P. Wang🇨🇳 · X. G. Wang🇦🇺

    The helicity-dependent strange quark distribution in the proton, , is calculated in a nonlocal chiral SU(3) effective field theory. The hadronic proton to meson plus octet or decuplet baryon splitting functions are derived at the one-loop level, with loop integrals rendered finite by correlation functions introduced in the nonlocal Lagrangian. Within the convolution framework, the proton strange helicity distribution is obtained using spin-flavor symmetry to constrain the input valence quark distributions in the hadronic intermediate states. The polarized strange quark distribution is found to be quite small, with the lowest moment of negative, but consistent with recent global QCD analyses.

    Comments:
    23 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    2203.06628 [pdf]
    PRD(2022)·9 citations
  2. 05

    [Submitted on 13 Mar 2022] (cross-list from hep-ph)

    Understanding mass hierarchy in collisional energy loss through heavy flavor data

    Bojana Ilic🇷🇸 · Magdalena Djordjevic🇷🇸

    While experimental observations, such as the mass hierarchy effect, are attributed and analyzed within radiative models, their interpretation crucially depends on collisional energy loss contribution, which is often neglected in such analyses. To our knowledge, neither a (direct) simple relation between collisional energy loss and heavy quark mass is established, nor an observable that quantifies this effect. On the other hand, the upcoming high-luminosity measurements at RHIC and LHC will generate heavy flavor data with unprecedented precision, providing an opportunity to utilize high-pT heavy flavor data to analyze the interaction mechanisms in the quark-gluon plasma. To this end, we employ a recently developed DREENA framework based on our dynamical energy loss formalism to study the mass hierarchy in heavy flavor suppression. We present i) Analytical derivation of a direct relation between collisional suppression/energy loss and heavy quark mass. ii) A novel observable sensitive only to the collisional energy loss mechanism to be tested by future high-precision experiments. iii) Analytical and numerical extraction of the mass hierarchy in collisional energy losses through this observable.

    Comments:
    15 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2203.06646 [pdf]
    PRC(2022)·3 citations
  3. 06

    [Submitted on 13 Mar 2022] (cross-list from hep-ph)

    Memory effects on energy loss and diffusion of heavy quarks in the quark-gluon plasma

    Marco Ruggieri🇨🇳 · Pooja🇮🇳 · Jai Prakash🇮🇳 · Santosh K. Das🇮🇳

    We study the dynamics of heavy quarks in a thermalized quark-gluon plasma with a time-correlated thermal noise, . In this case it is said that has memory. We use an integro-differential Langevin equation in which the memory enters via the thermal noise and the dissipative force. We assume that the time correlations of the noise decay exponentially on a time scale, , that we treat as a free parameter. We compute the effects of on the thermalization time of the heavy quarks, on their momentum broadening and on the nuclear modification factor. We find that overall memory slows down the momentum evolution of heavy quarks: in fact, transverse momentum broadening and the formation of are slowed down by memory and the thermalization time of the heavy quarks become larger. The potential impact on other observables is discussed briefly.

    Comments:
    10 pages, 7 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2203.06712 [pdf]
    PRD(2022)·51 citations
  4. 07

    [Submitted on 13 Mar 2022] (cross-list from nucl-ex)

    Nuclei with enhanced Schiff moments in practical elements for atomic and molecular EDM measurements

    J.A. Behr

    This is a resource paper concerning enhancement of observable time-reversal breaking effects by nuclear structure, aimed at AMO experimentalists. It's intended to support a white paper by providing some orientation on what can be said about some particular isotopes. Any conclusions are qualitative, and the reader should consult and cite the primary references and reviews rather than this arXiv alone.

    Comments:
    10 pages, 1 figure; v2 adds charge radius info and references. v3 references O. Sushkov 2024 calculation of Schiff moment of 153Eu
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2203.06758 [pdf]
    5 citations
  5. 08

    [Submitted on 14 Mar 2022] (cross-list from hep-ex)

    Electron Scattering and Neutrino Physics

    A. M. Ankowski🇺🇸 · A. Ashkenazi🇮🇱 · S. Bacca🇩🇪 · J. L. Barrow🇮🇱 · M. Betancourt🇺🇸 · A. Bodek🇺🇸 · M. E. Christy🇺🇸 · L. Doria. S. Dytman🇺🇸 · A. Friedland🇺🇸 · O. Hen🇺🇸 · C. J. Horowitz🇺🇸 · N. Jachowicz🇧🇪 and 41 other authors

    A thorough understanding of neutrino-nucleus scattering physics is crucial for the successful execution of the entire US neutrino physics program. Neutrino-nucleus interaction constitutes one of the biggest systematic uncertainties in neutrino experiments - both at intermediate energies affecting long-baseline Deep Underground Neutrino Experiment (DUNE), as well as at low energies affecting coherent scattering neutrino program - and could well be the difference between achieving or missing discovery level precision. To this end, electron-nucleus scattering experiments provide vital information to test, assess and validate different nuclear models and event generators intended to be used in neutrino experiments. In this white paper, we highlight connections between electron- and neutrino-nucleus scattering physics at energies ranging from 10s of MeV to a few GeV, review the status of ongoing and planned electron scattering experiments, identify gaps, and layout a path forward that benefits the neutrino community. We also highlight the systemic challenges with respect to the divide between the nuclear and high-energy physics communities and funding that presents additional hurdle in mobilizing these connections to the benefit of neutrino programs.

    Comments:
    37 pages, contribution to Snowmass 2021
    Subjects:
    High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2203.06853 [pdf]
    J.Phys.G(2023)·49 citations
  6. 09

    [Submitted on 14 Mar 2022] (cross-list from hep-ph)

    Contribution of the Weinberg-type Operator to atomic and nuclear electric dipole moments

    Naohiro Osamura🇯🇵 · Philipp Gubler🇯🇵 · Nodoka Yamanaka🇯🇵

    The contribution of the CP violating three-gluon Weinberg operator, , to the atomic and nuclear EDMs is estimated using QCD sum rules. After calculating the transition matrix element between the pion and the vacuum through the Weinberg operator, we obtain the long-range CP-odd nuclear force by determining the isovector CP-odd pion-nucleon vertex, using chiral perturbation theory at NLO. The EDMs of Hg, Xe, Ra, H, and He are finally given including comprehensive uncertainty analysis. While the leading contribution of the Hg EDM is given by the intrinsic nucleon EDM, that of Xe atom may be dominated by the one-pion exchange CP-odd nuclear force generated by the Weinberg operator. From current experimental data of the Hg atomic EDM, we obtain an upper limit on the Weinberg operator magnitude of if we assume that it is the only source of CP violation at the scale TeV.

    Comments:
    25 pages, 8 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph)
    arXiv:
    2203.06878 [pdf]
    JHEP(2022)·15 citations
  7. 10

    [Submitted on 14 Mar 2022] (cross-list from hep-ph)

    Energy-Energy Correlators for Precision QCD

    Duff Neill🇺🇸 · Gherardo Vita🇺🇸 · Ivan Vitev🇺🇸 · Hua Xing Zhu🇨🇳

    In this contribution to the Proceedings of the US Community Study on the Future of Particle Physics (Snowmass 2021) we review recent progress in the evaluation and application of the Energy-Energy Correlator (EEC) event shape observable in annihilation, hadronic collisions, and deep inelastic scattering. The importance of EEC as a precision probe of the perturbative and non perturbative aspects of QCD dynamics is emphasized. It can be used to extract the strong coupling constant and to constrain TMD distribution functions. Closely related energy-correlation shape variables have also been used to tag boosted objects produced in high energy collisions. The opportunities to study EEC at the future Electron-Ion Collider are also highlighted.

    Comments:
    18 pages, 10 figures. Submitted to the Proceedings of the US Community Study on the Future of Particle Physics (Snowmass 2021)
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2203.07113 [pdf]
    27 citations

Affiliations

first authorsco-authorsvia INSPIRE