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Nuclear Theory·nucl-th

Friday·February 21, 2020

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 06

    Origin of single transverse-spin asymmetries in high-energy collisions

    Justin Cammarota🇺🇸 · Leonard Gamberg🇺🇸 · Zhong-Bo Kang🇺🇸 · Joshua A. Miller🇺🇸 · Daniel Pitonyak🇺🇸 · Alexei Prokudin🇺🇸 · Ted C. Rogers🇺🇸 · Nobuo Sato🇺🇸

    In this paper we perform the first simultaneous QCD global analysis of data from semi-inclusive deep inelastic scattering, Drell-Yan, annihilation into hadron pairs, and proton-proton collisions. Consequently, we are able to extract a universal set of non-perturbative functions that describes the observed asymmetries in these reactions. The outcome of our analysis indicates single transverse-spin asymmetries in high-energy collisions have a common origin. Furthermore, we achieve the first phenomenological agreement with lattice QCD on the up and down quark tensor charges.

    ↳ hep-phhep-exhep-latnucl-ex+1PRD(2020)·167 citations
  3. 08

    Understanding long-range near-side ridge correlations in pp collisions using rope hadronization at LHC energies

    Pritam Chakraborty🇮🇳 · Sadhana Dash🇮🇳

    The observation of long range ridge-like structure in the near-side region of the two particle correlations as measured by LHC experiments in high multiplicity pp collisions indicated towards the presence of collective effects which are similar to that observed in pA(nucleon-nucleus) and AA (nucleus-nucleus) collisions. The two particle correlation between the charged particles in for pp collisions at = 7 TeV and 13 TeV is studied using Pythia 8 event generator within the framework of final-state partonic color reconnection effects as well as the microscopic rope hadronization model. The rope hadronization relies on the formation of ropes due to overlapping of strings in high multiplicity events followed by string shoving. A near side ridge-like structure which is qualitatively similar to the observed ridge in data was observed for high-multiplicity events when the mechanism of rope hadronization (with shoving) was enabled.

    ↳ hep-phhep-exnucl-exnucl-thPRC(2020)·7 citations
  4. 09

    Heavy-flavour in relativistic nuclear collisions: recent developments

    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. In particular we focus on observables arising from event-by-event fluctuations in the distribution of deposited energy (odd flow harmonics, event-shape-engineering) and from the tilting of the initial geometry with respect to the beam axis (directed flow), with a possible role played by the strong magnetic field generated by the spectator nucleons.

    ↳ hep-phnucl-th0 citations
  5. 10

    Bayesian Inference of Dense Matter Equation of State within Relativistic Mean Field Models using Astrophysical Measurements

    Silvia Traversi · Prasanta Char · Giuseppe Pagliara

    We present a Bayesian analysis to constrain the equation of state of dense nucleonic matter by exploiting the available data from symmetric nuclear matter at saturation and from observations of compact X-ray sources and from the gravitational wave event GW170817. For the first time, such analysis is performed by using a class of models, the relativistic mean field models, which allow to consistently construct an equation of state in a wide range of densities, isospin asymmetries and temperatures. The selected class of models contains five nuclear physics empirical parameters at saturation for which we construct the joint posterior distributions. By exploring different types of priors, we find that the equations of state with the largest evidence are the ones featuring a strong reduction of the effective mass of the nucleons in dense matter which can be interpreted as an indication of a phase transition to a chiral symmetry restored phase. Those equations of state in turn predict km. Finally, we present a preliminary investigation on the effect of including hyperons showing that they appear in stars more massive than about and lead to radii larger than about km. Within the model here explored, the formation of such particles provide a poor agreement with the constraints from GW170817.

    ↳ astro-ph.HEnucl-thApJ(2020)·94 citations

Affiliations

first authorsco-authorsvia INSPIRE