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Nuclear Theory·nucl-th

Monday·September 5, 2022

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 04

    [Submitted on 1 Sept 2022] (cross-list from nucl-ex)

    Proton distribution radii of O: signatures of new shell closures and neutron skin

    S. Kaur · R. Kanungo · W. Horiuchi · G. Hagen · J. D. Holt · B. S. Hu · T. Miyagi · T. Suzuki · F. Ameil · J. Atkinson · Y. Ayyad · S. Bagchi and 29 other authors

    The root mean square radii of the proton density distribution in O derived from measurements of charge changing cross sections with a carbon target at 900 MeV together with the matter radii portray thick neutron skin for O despite O being doubly magic. Imprints of the shell closures at = 14 and 16 are reflected in local minima of their proton radii that provide evidence for the tensor interaction causing them. The radii agree with it ab initio calculations employing the chiral NNLO interaction, though skin thickness predictions are challenged. Shell model predictions agree well with the data.

    Comments:
    6 pages, 3 figures, accepted for publication in Physical Review Letters
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2209.00722 [pdf]
    PRL(2022)·45 citations
  2. 05

    [Submitted on 2 Sept 2022] (cross-list from hep-ph)

    Jet modification in absence of QGP-medium: the role of multiparton interactions and color reconnection

    Prottoy Das🇮🇳 · Abhi Modak🇮🇳 · Debjani Banerjee🇮🇳 · Rathijit Biswas🇨🇳 · Supriya Das🇮🇳 · Sanjay K. Ghosh🇮🇳 · Sibaji Raha🇮🇳 · Sidharth Kumar Prasad🇮🇳

    Recent studies of high-multiplicity events in small collision systems (proton-proton and proton-lead) have drawn research interest towards the possibility of the formation of partonic medium in such systems. One of the important consequences of the formation of dense partonic medium is quenching of high-momentum final-state particles resulting in several experimental observations such as suppression in nuclear modification factor , modification of jet shape observable and jet fragmentation () distributions, etc. In this work, we study and for inclusive charged-particle jets in proton-proton (pp) collisions at ~=~13~TeV using PYTHIA~8 Monash~2013 Monte Carlo simulation. We show that the color reconnection (CR) and multiparton interaction (MPI) mechanisms in PYTHIA~8 can lead to an increased rate of jet production. We also find that the mechanisms of MPI and CR and change in the gluonic contribution in high-multiplicity events result in significant modification of and compared to those in minimum bias events for 10~~20~GeV/. We notice a direct connection of and gluonic contribution with the amount of modification in -- the larger the number of MPIs and/or gluonic contribution, the larger the amount of modification of .

    Comments:
    To be published in Chinese Physics C; 21 pages, 11 figures, 1 table
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2209.00972 [pdf]
    CPC(2024)·4 citations
  3. 06

    [Submitted on 2 Sept 2022] (cross-list from hep-ph)

    Statistical analysis of initial state and final state response in heavy-ion collisions

    Nicolas Borghini🇩🇪 · Marc Borrell🇩🇪 · Nina Feld🇩🇪 · Hendrik Roch🇩🇪 · Sören Schlichting🇩🇪 · Clemens Werthmann🇩🇪

    We develop a general decomposition of an ensemble of initial density profiles in terms of an average state and a basis of modes that represent the event-by-event fluctuations of the initial state. The basis is determined such that the probability distributions of the amplitudes of different modes are uncorrelated. Based on this decomposition, we quantify the different types and probabilities of event-by-event fluctuations in Glauber and Saturation models and investigate how the various modes affect different characteristics of the initial state. We perform simulations of the dynamical evolution with KoMPoST and MUSIC to investigate the impact of the modes on final-state observables and their correlations.

    Comments:
    v2: final version: minor additions, 59 pages, 40 figures (depending on the viewer, Figs.22-25 may display incorrectly)
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2209.01176 [pdf]
    PRC(2023)·26 citations

Affiliations

first authorsco-authorsvia INSPIRE