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Nuclear Theory·nucl-th

Thursday·November 2, 2023

11 papers—5 primary·6 cross-listed

All11Primary5Cross-lists6
  1. 06

    [Submitted on 31 Oct 2023] (cross-list from hep-ph)

    Anomalies in global SMEFT analyses: a case study of first-row CKM unitarity

    Vincenzo Cirigliano🇺🇸 · Wouter Dekens🇺🇸 · Jordy de Vries🇳🇱 · Emanuele Mereghetti🇺🇸 · Tom Tong🇩🇪

    Recent developments in the Standard Model analysis of semileptonic charged-current processes involving light quarks have revealed tensions in Cabibbo universality tests involving meson, neutron, and nuclear beta decays. In this paper, we explore beyond the Standard Model explanations of this so-called Cabibbo Angle Anomaly in the framework of the Standard Model Effective Field Theory (SMEFT), including not only low-energy charged current processes (`L'), but also electroweak precision observables (`EW') and Drell-Yan collider processes (`C') that probe the same underlying physics across a broad range of energy scales. The resulting `CLEW' framework not only allows one to test explanations of the Cabibbo Angle Anomaly, but is set up to provide near model-independent analyses with minimal assumptions on the flavor structure of the SMEFT operators. Besides the global analysis, we consider a large number of simpler scenarios, each with a subset of SMEFT operators, and investigate how much they improve upon the Standard Model fit. We find that the most favored scenarios, as judged by the Akaike Information Criterion, are those that involve right-handed charged currents. Additional interactions, namely oblique operators, terms modifying the Fermi constant, and operators involving right-handed neutral currents, play a role if the CDF determination of the mass is included in the analysis.

    Comments:
    70 pages, 16 figures, Supplemental Material included in ancillary files
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    2311.00021 [pdf]
    JHEP(2024)·58 citations
  2. 07

    [Submitted on 31 Oct 2023] (cross-list from hep-ph)

    Correlation between the symmetry energy slope and the deconfinement phase transition

    Luiz L. Lopes🇧🇷 · Debora P. Menezes🇧🇷 · Mateus R. Pelicer🇺🇸

    We study how the nuclear symmetry energy slope () can affect the hadron-quark phase transition and neutron star properties. We show that the main physical quantities as the critical chemical potential and pressure are strongly influenced by the symmetry energy slope. In extreme cases, the total amount of deconfined quarks can reach up to 99 of the hybrid star mass.

    Comments:
    Published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    2311.00125 [pdf]
    PRC(2024)·8 citations
  3. 08

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

    Nuclear PDFs After the First Decade of LHC Data

    M. Klasen🇩🇪 · H. Paukkunen🇫🇮

    We present a review of the conceptual basis, present knowledge and recent progress in the field of global analysis of nuclear parton distribution functions (PDFs). After introducing the theoretical foundations and methodological approaches for the extraction of nuclear PDFs from experimental data, we discuss how different measurements in fixed-target and collider experiments provide increasingly precise constraints on various aspects of nuclear PDFs, including shadowing, antishadowing, the EMC effect, Fermi motion, flavor separation, deuteron binding, target-mass and other higher-twist effects. Particular emphasis is given to measurements carried out in proton-lead collisions at the Large Hadron Collider, which have revolutionized the global analysis during the past decade. These measurements include electroweak-boson, jet, light-hadron, and heavy-flavor observables. Finally, we outline the expected impact of the future Electron Ion Collider and discuss the role and interplay of nuclear PDFs with other branches of nuclear, particle and astroparticle physics.

    Comments:
    Invited review, accepted by Ann. Rev. Nucl. Part. Sci. 40 pages, 3 tables, 8 figures, 1 suppl. page/figure
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2311.00450 [pdf]
    Ann.Rev.Nucl.Part.Sci.(2024)·86 citations
  4. 09

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

    Studying the production mechanisms of light meson resonances in two-pion photoproduction

    Łukasz Bibrzycki🇵🇱 · Nadine Hammoud🇵🇱 · Vincent Mathieu🇪🇸 · Robert J. Perry🇪🇸 · Adam P. Szczepaniak🇺🇸

    A theoretical model of two-pion photoproduction is presented. The model encodes the prominent resonance and the expected leading background contribution coming from the Deck mechanism. To validate the model, angular moments are computed and compared with the CLAS dataset. After fitting a number of free parameters, the model provides a good description of the data.

    Comments:
    5 pages, 2 figures, proceedings of 17th International Workshop on Meson Physics (MESON2023), June 22nd to 27th, 2023. arXiv admin note: text overlap with arXiv:2310.18990
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2311.00495 [pdf]
    EPJ Web Conf.(2024)·0 citations
  5. 10

    [Submitted on 1 Nov 2023] (cross-list from physics.atom-ph)

    Revisited nuclear magnetic dipole and electric quadrupole moments of polonium isotopes

    Leonid V. Skripnikov · Anatoly E. Barzakh

    We revisited the electronic structure parameters used to interpret the hyperfine structure of neutral polonium. We used a computational scheme that treats relativistic and high-order electronic correlation effects within the coupled cluster with single, double, triple and perturbative quadruple excitations CCSDT(Q) method, as well as estimate the contribution of quantum electrodynamics and finite nuclear size effects. A systematic study of the uncertainty is carried out. This allowed us to obtain significantly refined values for the nuclear magnetic dipole and electric quadrupole moments of a wide range of odd-mass polonium isotopes. For Po and Po we extracted both the magnetic moment and the nuclear magnetization distribution parameter in a nuclear model-independent way. To assess the accuracy of the calculations, we also computed the ionization potential (IP), excitation energies (EE) of the and electronic states and the electronic factor in the same theoretical framework. A good agreement of the theory and experiment for IP, EEs and confirms the reliability of the computational scheme and uncertainty estimation for the Po electromagnetic moments. We identify the electronic level as a potentially promising state for further studies of the nuclear moments of polonium isotopes.

    Subjects:
    Atomic Physics (physics.atom-ph); Nuclear Theory (nucl-th); physics.chem-ph (physics.chem-ph)
    arXiv:
    2311.00621 [pdf]
    PRC(2024)·5 citations
  6. 11

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

    Polarized fragmenting jet functions in Inclusive and Exclusive Jet Production

    Zhong-Bo Kang🇺🇸 · Hongxi Xing🇨🇳 · Fanyi Zhao🇺🇸 · Yiyu Zhou🇺🇸

    In this work, we present a complete theoretical framework for analyzing the distribution of polarized hadrons within jets, with and without measuring the transverse momentum relative to the standard jet axis. Using soft-collinear effective theory (SCET), we derive the factorization and provide the theoretical calculation of both semi-inclusive and exclusive fragmenting jet functions (FJFs) under longitudinal and transverse polarization. With the polarized FJFs, one gains access to a variety of new observables that can be used for extracting both collinear and transverse momentum dependent parton distribution functions (PDFs) and fragmentation functions (FFs). As examples, we provide numerical results for the spin asymmetry from polarized semi-inclusive hadron-in-jet production in polarized collisions at RHIC kinematics, where a transversely polarized quark would lead to the transverse spin of the final-state hadron inside the jet and is thus sensitive to the transversity fragmentation functions. Similarly, another spin asymmetry, from polarized exclusive hadron-in-jet production in polarized collisions at EIC kinematics would allow us to access the helicity fragmentation functions. These observables demonstrate promising potential in investigating transverse momentum dependent PDFs and FFs and are worthwhile for further measurements.

    Comments:
    49 pages, 9 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2311.00672 [pdf]
    JHEP(2024)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE