B_c B_c J/ψ B c B c J / ψ vertex form factor at finite temperature in the framework of QCD sum rules approach

2015/10/31 by E. Yazici, H. Sundu, E. Veli Veliev
Physics and Astronomy · #Coupling (piping) #Finite set #Form factor (electronics) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #QCD sum rules #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Thermal #Vertex (graph theory) #hep-ph

paper · pdf · doi:10.1140/epjc/s10052-016-3929-8

published as Eur. Phys. J. C (2016) 76:89 · 8 pages, 7 figures

arxiv created 2016/01/15 · openalex publication_date 2016/02/01 · openalex created_date 2016/06/24 · arxiv updated 2016/10/28 · openalex updated_date 2026/08/05

Abstract

The strong form factor of the B_c B_cJ/Ψ 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≃ 100~MeV but slightly increases after this point. After T≃ 160~MeV , the form factor suddenly decreases up to T≃ 170~MeV . The obtained result of the coupling constant by fitting the form factor at Q²=-m²_offshell 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.

Citations

• Review of Particle Physics
• QCD sum rules at finite temperature
• Effective continuum threshold in dispersive sum rules
• Charmonium in the vector channel at finite temperature from QCD sum rules
• QCD equation of state with almost physical quark masses