B(c)B(c)J/psi vertex form factor at finite temperature in the framework of QCD sum rules approach


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YAZICI E., Sundu H. , Veliev E.

EUROPEAN PHYSICAL JOURNAL C, vol.76, 2016 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 76 Issue: 2
  • Publication Date: 2016
  • Doi Number: 10.1140/epjc/s10052-016-3929-8
  • Title of Journal : EUROPEAN PHYSICAL JOURNAL C

Abstract

The strong form factor of the B(c)B(c)J/Psi vertex is calculated in the framework of the QCD sum rules method at finite temperature. Taking into account additional operators appearing at finite temperature, a thermal Wilson expansion is obtained and QCD sum rules are derived. While increasing the temperature, the strong form factor remains unchanged up to T similar or equal to 100 MeV but slightly increases after this point. After T similar or equal to 160 MeV, the form factor suddenly decreases up to T similar or equal to 170 MeV. The obtained result of the coupling constant by fitting the form factor at Q(2) = -m(offshell)(2) at T = 0 is in a very good agreement with the QCD sum rules calculations in the case of vacuum. Our prediction can be checked in future experiments.