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Nuclear Theory·nucl-th

Monday·June 12, 2023

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 01

    [Submitted on 9 Jun 2023]

    Resonances and scattering in microscopic cluster models with the complex-scaled generator coordinate method

    Takayuki Myo · Hiroki Takemoto

    The generator coordinate method of a microscopic cluster model is developed to treat the resonance and scattering of nuclear clusters with complex scaling. We consistently derive the formulation of the complex scaling for the microscopic cluster model, in which only the relative motions between clusters are transformed in the generator coordinate wave function. We also reveal the applicability of this method to the cluster wave function. Furthermore, we demonstrate this framework in the 2 system of Be and obtain the solutions of resonance and non-resonant continuum states. Using these solutions, we calculate the level density, which brings the phase shifts of the cluster-cluster scattering. This work becomes the foundation in the description of the multi-cluster scattering states of nuclei in a microscopic framework with complex scaling.

    Comments:
    9 pages, 9 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2306.05660 [pdf]
    PRC(2023)·14 citations
  2. 02

    [Submitted on 9 Jun 2023]

    Quantum kinetic theory with interactions for massive vector bosons

    David Wagner🇩🇪 · Nora Weickgenannt🇩🇪 · Enrico Speranza🇺🇸

    We present a derivation of quantum kinetic theory for massive spin-1 particles from the Wigner-function formalism up to first order in an -expansion, including a general interaction term. Both local and nonlocal contributions are computed in a covariant fashion. It is shown that, up to first order in , the collision term takes the same form as in the case of spin-1/2 particles.

    Comments:
    22 pages, no figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2306.05936 [pdf]
    PRD(2023)·20 citations
  3. 03

    [Submitted on 9 Jun 2023]

    NuCLR: Nuclear Co-Learned Representations

    Ouail Kitouni · Niklas Nolte · Sokratis Trifinopoulos · Subhash Kantamneni · Mike Williams

    We introduce Nuclear Co-Learned Representations (NuCLR), a deep learning model that predicts various nuclear observables, including binding and decay energies, and nuclear charge radii. The model is trained using a multi-task approach with shared representations and obtains state-of-the-art performance, achieving levels of precision that are crucial for understanding fundamental phenomena in nuclear (astro)physics. We also report an intriguing finding that the learned representation of NuCLR exhibits the prominent emergence of crucial aspects of the nuclear shell model, namely the shell structure, including the well-known magic numbers, and the Pauli Exclusion Principle. This suggests that the model is capable of capturing the underlying physical principles and that our approach has the potential to offer valuable insights into nuclear theory.

    Comments:
    7 pages, 5 figures. Accepted after peer review at the ICML 2023 1st workshop on Synergy of Scientific and Machine Learning Modeling (SynS & ML)
    Subjects:
    Nuclear Theory (nucl-th); Machine Learning (cs.LG); Nuclear Experiment (nucl-ex)
    arXiv:
    2306.06099 [pdf]
    2 citations
  4. 04

    [Submitted on 8 Jun 2023] (cross-list from hep-ph)

    Double particle production in ultraperipheral collisions at the Large Hadron Collider and Future Circular Collider

    Celsina N. Azevedo🇧🇷 · Victor P. Goncalves🇧🇷 · Bruno D. Moreira🇧🇷

    In this paper we analyze the associated production of a vector meson with a (pseudo)scalar bound state or a dimuon system in ultraperipheral collisions through the double scattering mechanism for the energies of the Large Hadron Collider (LHC) and Future Circular Collider (FCC). Our results complement previous studies for the double vector meson production. We present our predictions for the total cross sections and rapidity distributions considering the rapidity ranges covered by the ALICE and LHCb detectors, which indicate that a future experimental analysis of the , and final states is feasible.

    Comments:
    6 pages, 2 figures, 1 table. arXiv admin note: text overlap with arXiv:2210.04861
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2306.05519 [pdf]
    EPJA(2023)·6 citations
  5. 05

    [Submitted on 6 Jun 2023] (cross-list from hep-ph)

    Exploration of hadronization through heavy flavor production at the future Electron-Ion Collider

    Xuan Li🇺🇸

    The future Electron-Ion Collider (EIC), which is expected to start construction at Brookhaven National Laboratory in 2025, will utilize high-luminosity high-energy electron+proton and electron+nucleus collisions to explore several fundamental questions in the high energy and nuclear physics fields. Exploring how matter is formed from quarks and gluons, which is referred to as the hadronization process, is one of the EIC science objectives. The EIC project detector design led by the ePIC collaboration can realize a series of high precision heavy flavor hadron and jet measurements. Heavy flavor jet substructure and heavy flavor hadrons inside jets, which can provide direct information about the heavy quark hadronization process, have been studied in simulation for electron+proton and electron+nucleus collisions at EIC. The associated physics projections and comparison with latest theoretical calculations will be presented.

    Comments:
    5 pages, 4 figures, presented at at DIS2023: XXX International Workshop on Deep-Inelastic Scattering and Related Subjects, Michigan State University, USA, 27-31 March 2023
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2306.05525 [pdf]
    0 citations
  6. 06

    [Submitted on 8 Jun 2023] (cross-list from hep-lat)

    Chiral-even axial twist-3 GPDs of the proton from lattice QCD

    Shohini Bhattacharya🇺🇸 · Krzysztof Cichy🇵🇱 · Martha Constantinou🇺🇸 · Jack Dodson🇺🇸 · Andreas Metz🇺🇸 · Aurora Scapellato🇺🇸 · Fernanda Steffens🇩🇪

    This work presents the first lattice-QCD calculation of the twist-3 axial quark GPDs for the proton using the large-momentum effective theory approach. We calculate matrix elements with momentum-boosted proton states and a non-local axial operator. The calculation is performed using one ensemble of two degenerate light, a strange and a charm quark () of maximally twisted mass fermions with a clover term. The ensemble has a volume , lattice spacing 0.0934 fm, and corresponds to a pion mass of 260 MeV. The matrix elements are calculated for three values of the proton momentum, namely 0.83, 1.25, and 1.67 GeV. The light-cone GPDs are defined in the symmetric frame, which we implement here with a (negative) 4-momentum transfer squared of 0.69, 1.38, and 2.76 GeV, all at zero skewness. We also conduct several consistency checks, including assessing the local limit of the twist-3 GPDs and examining the Burkhardt-Cottingham-type as well as Efremov-Teryaev-Leader-type sum rules.

    Comments:
    22 pages, 17 figures. Version accepted for publication in Physical Review D
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2306.05533 [pdf]
    PRD(2023)·49 citations

Affiliations

first authorsco-authorsvia INSPIRE