No abstract

No abstract

Using the vacuum correlator method the nonperturbative contribution to the P-wave spin-spin shift A = M , . , ( n ' p , ) -M ( n ' P I ) is calculated. It is shown that the sign and absolute value of A are very sensitive to the sign and amplitude u, of the nonconfining vacuum correlator D , . If u, < 0 then the shift A is also negative, but if n , > 0 we have obtained a positive A > 0 in contrast with the prediction in the framework of perturbative QCD.

No abstract

No abstract