https://doi.org/10.1140/epjc/s10052-016-3929-8
Regular Article - Theoretical Physics
vertex form factor at finite temperature in the framework of QCD sum rules approach
Department of Physics, Kocaeli University, 41380, Izmit, Turkey
* e-mail: enis.yazici@kocaeli.edu.tr
Received:
26
October
2015
Accepted:
1
February
2016
Published online:
20
February
2016
The strong form factor of the 
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 
but slightly increases after this point. After 
, the form factor suddenly decreases up to 
. The obtained result of the coupling constant by fitting the form factor at 
at 
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.
© The Author(s), 2016
