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Elastic double diffractive production of axial-vector χc (1+ +) mesons and the Landau-Yang theorem

Pasechnik, R. S. LU ; Szczurek, A. and Teryaev, O. V. (2009) In Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics 680(1). p.62-71
Abstract

We discuss exclusive elastic double diffractive axial-vector χc (1+) meson production in proton-antiproton collisions at the Tevatron. The amplitude for the process is derived within the kt-factorization approach with unintegrated gluon distribution functions (UGDFs). We show that the famous Landau-Yang theorem is not applicable in the case of off-shell gluons. Differential cross sections for different UGDFs are calculated. We compare exclusive production of χc (1+) and χc (0+). The contribution of χc (1+) to the J / Ψ + γ channel is smaller than that of the χc (0+) decay, but not negligible and can be measured. The... (More)

We discuss exclusive elastic double diffractive axial-vector χc (1+) meson production in proton-antiproton collisions at the Tevatron. The amplitude for the process is derived within the kt-factorization approach with unintegrated gluon distribution functions (UGDFs). We show that the famous Landau-Yang theorem is not applicable in the case of off-shell gluons. Differential cross sections for different UGDFs are calculated. We compare exclusive production of χc (1+) and χc (0+). The contribution of χc (1+) to the J / Ψ + γ channel is smaller than that of the χc (0+) decay, but not negligible and can be measured. The numerical value of the ratio of the both contributions is much less dependent on the UGDFs modeling than the cross sections themselves.

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author
publishing date
type
Contribution to journal
publication status
published
in
Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
680
issue
1
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:69549115138
ISSN
0370-2693
DOI
10.1016/j.physletb.2009.08.035
language
English
LU publication?
no
id
ca25e261-e02b-4aef-b197-34b72e149154
date added to LUP
2016-08-18 21:11:30
date last changed
2018-01-07 11:23:46
@article{ca25e261-e02b-4aef-b197-34b72e149154,
  abstract     = {<p>We discuss exclusive elastic double diffractive axial-vector χ<sub>c</sub> (1<sup>+</sup>) meson production in proton-antiproton collisions at the Tevatron. The amplitude for the process is derived within the k<sub>t</sub>-factorization approach with unintegrated gluon distribution functions (UGDFs). We show that the famous Landau-Yang theorem is not applicable in the case of off-shell gluons. Differential cross sections for different UGDFs are calculated. We compare exclusive production of χ<sub>c</sub> (1<sup>+</sup>) and χ<sub>c</sub> (0<sup>+</sup>). The contribution of χ<sub>c</sub> (1<sup>+</sup>) to the J / Ψ + γ channel is smaller than that of the χ<sub>c</sub> (0<sup>+</sup>) decay, but not negligible and can be measured. The numerical value of the ratio of the both contributions is much less dependent on the UGDFs modeling than the cross sections themselves.</p>},
  author       = {Pasechnik, R. S. and Szczurek, A. and Teryaev, O. V.},
  issn         = {0370-2693},
  language     = {eng},
  month        = {09},
  number       = {1},
  pages        = {62--71},
  publisher    = {Elsevier},
  series       = {Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics},
  title        = {Elastic double diffractive production of axial-vector χ<sub>c</sub> (1<sup>+ +</sup>) mesons and the Landau-Yang theorem},
  url          = {http://dx.doi.org/10.1016/j.physletb.2009.08.035},
  volume       = {680},
  year         = {2009},
}