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

被引：35
作者：
Pasechnik, R. S. [1 ]
Szczurek, A. [2 ,3 ]
Teryaev, O. V. [4 ]
机构：
[1] Uppsala Univ, Dept Phys & Astron, SE-75121 Uppsala, Sweden
[2] Univ Rzeszow, PL-35959 Rzeszow, Poland
[3] Inst Nucl Phys, PAN, PL-31342 Krakow, Poland
[4] Joint Inst Nucl Res, Bogoliubov Lab Theoret Phys, Dubna 141980, Russia
来源：
PHYSICAL REVIEW D | 2010年 / 81卷 / 03期
关键词：
DYNAMICAL PARTON DISTRIBUTIONS; DIFFRACTIVE PROCESSES; LHC; ANNIHILATION; TEVATRON; PHYSICS; PROTON; QCD;
D O I：
10.1103/PhysRevD.81.034024
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 partially due to a significant contribution from lower polarization states lambda = 0 for chi(c)(1(+)) and lambda = 0, +/- 1 for chi(c)(2(+)) meson. Corresponding theoretical uncertainties are discussed.
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