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

Pasechnik, R. S. LU ; Szczurek, A. and Teryaev, O. V. (2010) In Physical Review D (Particles, Fields, Gravitation and Cosmology) 81(3).
Abstract

We discuss central exclusive production (CEP) of the tensor χc(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 χc(0+), χc(1+) and χc(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... (More)

We discuss central exclusive production (CEP) of the tensor χc(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 χc(0+), χc(1+) and χc(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 +,2+) to the J/Ψ+γ channel to be comparable or larger than that of the χc(0+) one. This is partially due to a significant contribution from lower polarization states λ=0 for χc(1+) and λ=0, ±1 for χc(2+) meson. Corresponding theoretical uncertainties are discussed. © 2010 The American Physical Society.

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author
organization
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type
Contribution to journal
publication status
published
in
Physical Review D (Particles, Fields, Gravitation and Cosmology)
volume
81
issue
3
publisher
American Physical Society
external identifiers
  • scopus:77749334763
ISSN
1550-7998
DOI
10.1103/PhysRevD.81.034024
language
English
LU publication?
yes
id
9ba097b6-c429-4d8e-9d98-4cd217446181
date added to LUP
2016-08-18 21:08:10
date last changed
2017-09-10 05:08:36
@article{9ba097b6-c429-4d8e-9d98-4cd217446181,
  abstract     = {<p>We discuss central exclusive production (CEP) of the tensor χc(2 <sup>+</sup>) 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 χc(0<sup>+</sup>), χc(1<sup>+</sup>) and χc(2<sup>+</sup>). 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 +,2<sup>+</sup>) to the J/Ψ+γ channel to be comparable or larger than that of the χc(0<sup>+</sup>) one. This is partially due to a significant contribution from lower polarization states λ=0 for χc(1<sup>+</sup>) and λ=0, ±1 for χc(2<sup>+</sup>) meson. Corresponding theoretical uncertainties are discussed. © 2010 The American Physical Society.</p>},
  articleno    = {034024},
  author       = {Pasechnik, R. S. and Szczurek, A. and Teryaev, O. V.},
  issn         = {1550-7998},
  language     = {eng},
  month        = {02},
  number       = {3},
  publisher    = {American Physical Society},
  series       = {Physical Review D (Particles, Fields, Gravitation and Cosmology)},
  title        = {Nonperturbative and spin effects in the central exclusive production of the tensor χc(2+) meson},
  url          = {http://dx.doi.org/10.1103/PhysRevD.81.034024},
  volume       = {81},
  year         = {2010},
}