Bottomonium states in hot asymmetric strange hadronic matter

Amruta Mishra and Divakar Pathak
Phys. Rev. C 90, 025201 – Published 4 August 2014

Abstract

We calculate the in-medium masses of the bottomonium states [Υ(1S),Υ(2S),Υ(3S), and Υ(4S)] in isospin asymmetric strange hadronic matter at finite temperatures. The medium modifications of the masses arise due to the interaction of these heavy quarkonium states with the gluon condensates of QCD. The gluon condensates in the hot hadronic matter are computed from the medium modification of a scalar dilaton field within a chiral SU(3) model, introduced in the hadronic model to incorporate the broken scale invariance of QCD. There is seen to be a drop in the masses of the bottomonium states and mass shifts are observed to be quite considerable at high densities for the excited states. The effects of density, isospin asymmetry, strangeness, as well as temperature of the medium on the masses of the Υ states are investigated. The effects of the isospin asymmetry as well as strangeness fraction of the medium are seen to be appreciable at high densities and small temperatures. The density effects are the most dominant medium effects which should have observable consequences in the compressed baryonic matter (CBM) in the heavy ion collision experiments in the future facility at FAIR, GSI. The study of the Υ states will, however, require access to energies higher than the energy regime planned at CBM experiment. The density effects on the bottomonium masses should also show up in the dilepton spectra at the Super Proton Synchrotron (SPS) energies, especially for the excited states for which the mass drop is observed to quite appreciable.

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  • Received 21 April 2014
  • Revised 29 June 2014

DOI:https://doi.org/10.1103/PhysRevC.90.025201

©2014 American Physical Society

Authors & Affiliations

Amruta Mishra* and Divakar Pathak

  • Department of Physics, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110 016, India

  • *amruta@physics.iitd.ac.in; mishra@th.physik.uni-frankfurt.de
  • dpdlin@gmail.com

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Vol. 90, Iss. 2 — August 2014

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