CP-Violating Effect of QCD Vacuum in Quark Fragmentation

Abstract

We demonstrate that the non-trivial CP-violating structure of QCD vacuum can lead to an observable effect in $e^{+}{e}^{-}\to q\bar{q}\to 2$-jet annihilation. We find that the sign of the jet handedness correlation can be opposite to that predicted by factorization of $q\bar{q}$ fragmentation and CP-conjugation of the two jets. A simple model estimation of the handedness correlation magnitude is given.

Comments: significantly revised and extended version to appear in Phys.Lett.B