Properties of J/ψ at Tc: QCD second-order Stark effect

Su Houng Lee, Kenji Morita

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Starting from the temperature dependencies of the energy density and pressure from lattice QCD calculation, we extract the temperature dependencies of the electric and magnetic condensate near Tc. While the magnetic condensate hardly changes across Tc, we find that the electric condensate increases abruptly above Tc. This induces a small but equally abrupt decrease in the mass of J/ψ, which can be calculated through the second-order Stark effect. Combining the present result with the previously determined QCD sum rule constraint, we extract the thermal width of J/ψ above Tc, which also increases fast. These changes can be identified as the critical behavior of J/ψ across Tc associated with the phase transition. We find that the mass shift and width broadening of J/ψ at 1.05Tc will be around -100MeV and 100 MeV, respectively.

Original languageEnglish
Article number011501
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume79
Issue number1
DOIs
Publication statusPublished - 2009 Jan 5

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Stark effect
condensates
quantum chromodynamics
sum rules
flux density
temperature
shift

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

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Properties of J/ψ at Tc : QCD second-order Stark effect. / Lee, Su Houng; Morita, Kenji.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 79, No. 1, 011501, 05.01.2009.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Properties of J/ψ at Tc

T2 - QCD second-order Stark effect

AU - Lee, Su Houng

AU - Morita, Kenji

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N2 - Starting from the temperature dependencies of the energy density and pressure from lattice QCD calculation, we extract the temperature dependencies of the electric and magnetic condensate near Tc. While the magnetic condensate hardly changes across Tc, we find that the electric condensate increases abruptly above Tc. This induces a small but equally abrupt decrease in the mass of J/ψ, which can be calculated through the second-order Stark effect. Combining the present result with the previously determined QCD sum rule constraint, we extract the thermal width of J/ψ above Tc, which also increases fast. These changes can be identified as the critical behavior of J/ψ across Tc associated with the phase transition. We find that the mass shift and width broadening of J/ψ at 1.05Tc will be around -100MeV and 100 MeV, respectively.

AB - Starting from the temperature dependencies of the energy density and pressure from lattice QCD calculation, we extract the temperature dependencies of the electric and magnetic condensate near Tc. While the magnetic condensate hardly changes across Tc, we find that the electric condensate increases abruptly above Tc. This induces a small but equally abrupt decrease in the mass of J/ψ, which can be calculated through the second-order Stark effect. Combining the present result with the previously determined QCD sum rule constraint, we extract the thermal width of J/ψ above Tc, which also increases fast. These changes can be identified as the critical behavior of J/ψ across Tc associated with the phase transition. We find that the mass shift and width broadening of J/ψ at 1.05Tc will be around -100MeV and 100 MeV, respectively.

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