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Title: J/{psi} at finite density in QCD sum rule analysis

Abstract

For the 'anomalous'J/{psi} suppression in Pb-Pb collision announced by NA50 Collaboration I propose new mechanism accessible to the novel behavior of the data. The point of new idea is to focus on in-medium effects on the masses of mesons containing charmed quarks. In QCD sum rule analysis, I find that the D-meson involving one charmed quark feels more attractive force from the surrounding nucleons than the charmonium composed of two charmed quarks. As a result, it will appear that as the nucleon density increases DD-bar threshold in turn falls below higher-lying charmonium states ({psi}{sup '},{chi}{sub c}) which have the energy levels below the threshold in vacuum. Finally, also for the low-lying J/{psi} state, a larger decay channel to the threshold could be opened up. Therefore, this mechanism can qualitatively explain some features of the anomalous J/{psi} suppression without advent of deconfinement phase.

Authors:
 [1]
  1. Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)
Publication Date:
OSTI Identifier:
21210322
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 494; Journal Issue: 1; Conference: Conference on new directions in quantum chromodynamics, Seoul (Korea, Republic of); Kyungju (Korea, Republic of), 26 May - 18 Jun 1999; Other Information: DOI: 10.1063/1.1301692; (c) 1999 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; C QUARKS; D MESONS; DEEP INELASTIC HEAVY ION REACTIONS; ENERGY LEVELS; J PSI-3097 MESONS; LEAD 208 REACTIONS; LEAD 208 TARGET; NUCLEAR MATTER; NUCLEONS; PARTICLE DECAY; QUANTUM CHROMODYNAMICS; REST MASS; SUM RULES

Citation Formats

Hayashigaki, Arata. J/{psi} at finite density in QCD sum rule analysis. United States: N. p., 1999. Web. doi:10.1063/1.1301692.
Hayashigaki, Arata. J/{psi} at finite density in QCD sum rule analysis. United States. https://doi.org/10.1063/1.1301692
Hayashigaki, Arata. 1999. "J/{psi} at finite density in QCD sum rule analysis". United States. https://doi.org/10.1063/1.1301692.
@article{osti_21210322,
title = {J/{psi} at finite density in QCD sum rule analysis},
author = {Hayashigaki, Arata},
abstractNote = {For the 'anomalous'J/{psi} suppression in Pb-Pb collision announced by NA50 Collaboration I propose new mechanism accessible to the novel behavior of the data. The point of new idea is to focus on in-medium effects on the masses of mesons containing charmed quarks. In QCD sum rule analysis, I find that the D-meson involving one charmed quark feels more attractive force from the surrounding nucleons than the charmonium composed of two charmed quarks. As a result, it will appear that as the nucleon density increases DD-bar threshold in turn falls below higher-lying charmonium states ({psi}{sup '},{chi}{sub c}) which have the energy levels below the threshold in vacuum. Finally, also for the low-lying J/{psi} state, a larger decay channel to the threshold could be opened up. Therefore, this mechanism can qualitatively explain some features of the anomalous J/{psi} suppression without advent of deconfinement phase.},
doi = {10.1063/1.1301692},
url = {https://www.osti.gov/biblio/21210322}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 494,
place = {United States},
year = {Mon Nov 22 00:00:00 EST 1999},
month = {Mon Nov 22 00:00:00 EST 1999}
}