PaperPanorama
FAQ

Nuclear Theory·nucl-th

Tuesday·December 18, 2018

16 papers—7 primary·9 cross-listed

All16Primary7Cross-lists9
  1. 01

    [Submitted on 14 Dec 2018]

    Towards an extraction of with an uncertainty controlled energy loss Monte-Carlo

    Weiyao Ke🇺🇸 · Yingru Xu🇺🇸 · Steffen A. Bass🇺🇸

    Recent progress in open-heavy-flavor measurements and future experimental upgrades are bringing heavy-flavor physics into the precision era, allowing for strong quantitative constraints on the transport properties of heavy quarks in the quark-gluon plasma. Starting from the LIDO transport model, which combines a matrix-element based linearized-Boltzmann transport and diffusion-based Langevin equation, we have made two essential improvements to increase both the flexibility and physical accuracy of the model. First, we have absorbed the pQCD scatterings with small momentum transfers to the medium into the diffusion part of the LIDO model, and we have restricted the use of vacuum matrix elements to large momentum transfer processes. This study allows us to construct a model that smoothly interpolates between a pure pQCD based approach and a radiation-improved Langevin equation by tuning a single scale parameter. Second, the Monte-Carlo implementation of the Landau-Pomeranchuk-Migdal effect of the original model has been improved to account for multiple scatterings of gluons. The simulated radiative energy loss can be tuned to quantitatively agree with semi-analytic theory calculations both for a static (finite / infinite) medium and for a dynamic expanding medium. With such improvements, the LIDO model will greatly facilitate the extraction of heavy-quark transport coefficient from a systematic model-to-data comparison.

    Comments:
    5 pages, 2 figures, for the International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, 30 September -- 5 October 2018, Aix-Les-Bains, Savoie, France
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1812.06149 [pdf]
    1 citation
  2. 02

    [Submitted on 15 Dec 2018]

    Resonance production in high energy collisions from small to big systems

    K. Werner🇫🇷 · A. G. Knospe🇺🇸 · C. Markert🇺🇸 · B. Guiot🇫🇷 · Iu. Karpenko🇫🇷 · T. Pierog🇩🇪 · G. Sophys🇫🇷 · M. Stefaniak🇫🇷 · M. Bleicher🇩🇪 · J. Steinheimer🇩🇪

    The aim of this paper is to understand resonance production (and more generally particle production) for different collision systems, namely proton-proton (pp), proton-nucleus (pA), and nucleus-nucleus (AA) scattering at the LHC. We will investigate in particular particle yields and ratios versus multiplicity, using the same multiplicity definition for the three different systems, in order to analyse in a compact way the evolution of particle production with the system size and the origin of a very different system size dependence of the different particles.

    Comments:
    Proceedings of the 17th International Conference on Strangeness in Quark Matter (SQM 2017), https://www.epj-conferences.org/articles/epjconf/abs/2018/06/epjconf_sqm2018_09002/epjconf_sqm2018_09002.html
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1812.06330 [pdf]
    EPJ Web Conf.(2018)·19 citations
  3. 03

    [Submitted on 15 Dec 2018]

    Jet substructure modification in a QGP from a multi-scale description of jet evolution with JETSCAPE

    Y. Tachibana🇺🇸 · A. Angerami · S. A. Bass · S. Cao · J. Coleman · L. Cunqueiro · T. Dai · L. Du · H. Elfner · D. Everett · W. Fan · R. Fries and 32 other authors

    The modification of jet substructure in relativistic heavy-ion collisions is studied using JETSCAPE, a publicly available software package containing a framework for Monte Carlo event generators. Multi-stage jet evolution in JETSCAPE provides an integrated description of jet quenching by combining multiple models, with each becoming active at a different stage of the parton shower evolution. Jet substructure modification due to different aspects of jet quenching is studied using jet shape and jet fragmentation observables. Various combinations of jet energy loss models are exploed, with medium background provided by (2 + 1)-D VISHNU with TRENTo+freestreaming initial conditions. Results reported here are from simulations performed within JETSCAPE framework.

    Comments:
    4 pages, 3 figures, Proceedings of Hard Probes 2018, 30 September-5 October, Aix-Les-Bains, France
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1812.06366 [pdf]
    PoS(2018)·17 citations
  4. 04

    [Submitted on 16 Dec 2018]

    Cluster radioactivity of Og

    Zachary Matheson🇺🇸 · Samuel A. Giuliani🇺🇸 · Witold Nazarewicz🇺🇸 · Jhilam Sadhukhan🇮🇳 · Nicolas Schunck🇺🇸

    According to theory, cluster radioactivity becomes an important decay mode in superheavy nuclei. In this work, we predict that the strongly-asymmetric fission, or cluster emission, is in fact the dominant fission channel for Og, which is currently the heaviest synthetic isotope known. Our theoretical approach incorporates important features of fission dynamics, including quantum tunneling and stochastic dynamics up to scission. We show that, despite appreciable differences in static fission properties such as fission barriers and spontaneous fission lifetimes, the prediction of cluster radioactivity in Og is robust with respect to the details of calculations, including the choice of energy density functional, collective inertia, and the strength of the dissipation term.

    Comments:
    6 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1812.06490 [pdf]
    PRC(2019)·57 citations
  5. 05

    [Submitted on 17 Dec 2018]

    Study of the effect of newly calculated phase space factor on beta-decay half-lives

    Jameel-Un Nabi · Mavra Ishfaq · Ovidiu Nitescu · Mihail Mirea · Sabin Stoica

    We present results for -decay half-lives based on a new recipe for calculation of phase space factors recently introduced. Our study includes -shell and heavier nuclei of experimental and astrophysical interests. The investigation of the kinematics of some -decay half-lives is presented, and new phase space factor values are compared with those obtained with previous theoretical approximations. Accurate calculation of nuclear matrix elements is a pre-requisite for reliable computation of -decay half-lives and is not the subject of this paper. This paper explores if improvements in calculating the -decay half-lives can be obtained when using a given set of nuclear matrix elements and employing the new values of the phase space factors. Although the largest uncertainty in half-lives computations come from the nuclear matrix elements, introduction of the new values of the phase space factors may improve the comparison with experiment. The new half-lives are systematically larger than previous calculations and may have interesting consequences for calculation of stellar rates.

    Comments:
    14 pages, 5 figures, 8 tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1812.06670 [pdf]
    Adv.High Energy Phys.(2019)·2 citations
  6. 06

    [Submitted on 17 Dec 2018]

    Dynamics of relativistic spin-polarized fluids

    Wojciech Florkowski🇵🇱 · Bengt Friman🇩🇪 · Amaresh Jaiswal🇮🇳 · Radoslaw Ryblewski🇵🇱 · Enrico Speranza🇩🇪

    We briefly review the foundations of a new relativistic fluid dynamics framework for polarized systems of particles with spin one half. Using this approach we numerically study the dynamics of the spin polarization of a rotating medium resembling the ones created in high-energy heavy-ion collisions.

    Comments:
    Presented by Radoslaw Ryblewski at XIII Workshop on Particle Correlations and Femtoscopy (WPCF) 2018, May 22-26, 2018, Krakow, Poland; 6 pages, 1 figure
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1812.06801 [pdf]
    Acta Phys.Polon.Supp.(2019)·2 citations
  7. 07

    [Submitted on 17 Dec 2018]

    Finding the Scatterers in Hot Quark Soup

    Francesco D'Eramo🇮🇹 · Krishna Rajagopal🇺🇸 · Yi Yin🇺🇸

    We present a brief report on a thought experiment in which an incident energetic parton traverses a brick of quark-gluon plasma (QGP), see arXiv:1808.03250 for the full report. We calculate the probability of detecting a parton showing up at a large angle with respect to its initial direction due to scattering with the constituents of QGP, using leading order perturbative QCD. We include all relevant channels, including the Rutherford-like channel as considered in early works, and those that are not Rutherford-like but become important at a large angle. The resulting probability distributions contain information about the short distance structure of QGP. Our results provide key theoretical input toward finding the scatterers within the QGP liquid, which in turn is the necessary first step toward using precise, high-statistics, suitably differential measurements of jet modification in heavy ion collisions to study the evolution of the properties of QGP with changing resolution scale.

    Comments:
    5 pages, 4 figures, for the International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, 30 September - 5 October 2018 in Aix-Les-Bains, Savoie, France
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1812.06878 [pdf]
    PoS(2018)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE