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Nuclear Theory·nucl-th

Thursday·October 10, 2019

8 papers—5 primary·3 cross-listed

All8Primary5Cross-lists3
  1. 06

    An effective field theory approach to quarkonium at small transverse momentum

    Sean Fleming🇺🇸 · Yiannis Makris🇮🇹 · Thomas Mehen🇺🇸

    In this work we apply effective field theory (EFT) to observables in quarkonium production and decay that are sensitive to soft gluon radiation, in particular measurements that are sensitive to small transverse momentum. Within the EFT framework we study decay to light quarks followed by the fragmentation of those quarks to light hadrons. We derive a factorization theorem that involves transverse momentum distribution (TMD) fragmentation functions and new quarkonium TMD shape functions. We derive renormalization group equations, both in rapidity and virtuality, which are used to evolve the different terms in the factorization theorem to resum large logarithms. This theoretical framework will provide a systematic treatment of quarkonium production and decay processes in TMD sensitive measurements.

    ↳ hep-phnucl-thJHEP(2020)·61 citations
  2. 07

    Heavy-flavour observables in relativistic nuclear collisions: theory overview

    Andrea Beraudo🇮🇹

    Transport calculations represent the major tool to simulate the modifications induced by the presence of a hot-deconfined medium on the production of heavy-flavour particles in high-energy nuclear collisions. After a brief description of the approach and of the major achievements in its phenomenological applications we discuss some recent developments. From the theory side we focus on the evaluation of transport coefficients and on recent formulations of the problem of heavy-flavour in-medium propagation in the language of open quantum systems. From a more phenomenological perspective we give an overview of the attempts to extend theoretical models to reproduce recent experimental data arising from event-by-event fluctuations (odd flow harmonics, event-shape-engineering) or from medium-modifications of hadronization ( and production)

    ↳ hep-phnucl-thJ.Phys.Conf.Ser.(2020)·0 citations
  3. 08

    Crust of accreting neutron stars within simplified reaction network

    Nikolay N. Shchechilin · Andrey I. Chugunov (Ioffe Institute)

    Transiently accreting neutron stars in low mass X-ray binaries are generally believed to be heated up by nuclear reactions in accreted matter during hydrostatic compression. Detailed modeling of these reactions is required for the correct interpretation of observations. In this paper, we construct a simplified reaction network, which can be easily implemented and depends mainly on atomic mass tables as nuclear physics input. We show that it reproduces results of the detailed network by Lau et al. (2018) very well, if one applies the same mass model. However, the composition and the heating power are shown to be sensitive to the mass table used and treatment of mass tables boundary, if one applies several of them in one simulation. In particular, the impurity parameter at density g cm can differ for a factor of few, and even increase with density increase. The profile of integrated heat realize shown to be well confined between results by Fantina et al. (2018) and Lau et al. (2018).

    ↳ astro-ph.HEastro-ph.SRnucl-thMNRAS(2019)·19 citations

Affiliations

first authorsco-authorsvia INSPIRE