Nonperturbative and spin effects in the central exclusive production of the tensor chi c(2(+)) meson

作者：Pasechnik R S^*; Szczurek A; Teryaev O V

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2010, 81(3): 034024.

DOI：10.1103/PhysRevD.81.034024

We discuss central exclusive production (CEP) of the tensor chi(c)(2(+)) meson in proton-(anti) proton collisions at Tevatron, RHIC, and LHC energies. The amplitude for the process is derived within the kt-factorization approach. Differential and total cross sections are calculated for several unintegrated gluon distribution functions (UGDFs). We compare exclusive production of all charmonium states chi(c)(0(+)), chi(c)(1(+)) and chi(c)(2(+)). Good description of the recent Tevatron data is achieved both with Martin-Ryskin phenomenological UGDF and UGDF based on unified BFKL-DGLAP approach. Unlike for Higgs production, the main contribution to the diffractive amplitude of heavy quarkonia comes from nonperturbative region of gluon transverse momenta Q(perpendicular to) < 1 GeV. At y approximate to 0, depending on UGDF we predict the contribution of chi(c)(1(+), 2(+)) to the J/psi + gamma channel to be comparable or larger than that of the chi(c)(0(+)) one. This is par

• 出版日期2010-2-1