Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-07-16
Phys.Lett. B339 (1994) 263-269
Physics
High Energy Physics
High Energy Physics - Phenomenology
Latex file, 9 pages, 4 figures available on request from mm@infn.ferrara.it INFN-FE 07-94
Scientific paper
10.1016/0370-2693(94)90642-4
The bounds on the values of gluon, four-quark and quark-gluon condensates are derived from the requirement of consistency of the sum rules for various correlators of the hybrid current $a_{\mu}=g\bar d\gamma_{\rho}\tilde G_{\rho\mu}u$. The upper bound for the gluon condensate is found to be less then twice its standard value while for the four-quark condensates the violation of factorization by a factor 3-4 is allowed. The value of the quark-gluon condensate is given as a function of $\left<\frac{\alpha_s}{\pi} G^2\right>$ and $\left<(\bar q\Gamma q)^2\right >$ which for the standard values yields $m_0^2=0.63~\mbox{GeV}^2$ . Our procedure of simultaneous solution of a number of sum rules allows the quantitative error analysis and is appropriate for condensate determination also in other cases.
Aladashvili Ketino
Margvelashvili Murman
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