RESUMO
The conservation of an axial current modified by the gravitational chiral anomaly implies the universal transport phenomenon (kinematical vortical effect) dependent solely on medium vorticity and acceleration, but not dependent explicitly on its temperature and density. This general analysis is verified for the case of massless fermions with spin-1/2.
RESUMO
The cross section of chi(cJ) hadroproduction is calculated in the k( perpendicular)-factorization approach. We find a significant contribution of the chi(c1) state due to non-applicability of the Landau-Yang theorem because of off-shell gluons. The results are in agreement with data and, in contrast to the collinear factorization, show a dominance of the color-singlet part and a strong suppression of the color octet contribution. Our results could therefore lead to a solution of the long-standing controversy between the color-singlet model and the color-octet mechanism.