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pp→ppη′ reaction at high energies

Szczurek, A.; Pasechnik, R. S. LU and Teryaev, O. V. (2007) In Physical Review D (Particles, Fields, Gravitation and Cosmology) 75(5).
Abstract

We discuss double-diffractive (double-elastic) production of the η′-meson in the pp→pη′p reaction within the formalism of unintegrated gluon distribution functions (UGDF). We estimate also the contribution of γ*γ*→η′ fusion. The distributions in the Feynman xF (or rapidity), transferred four-momenta squared between initial and final protons (t1,t2) and azimuthal angle difference between outgoing protons (Φ) are calculated. The deviations from the sin 2(Φ) dependence predicted by one-step vector-vector-pseudoscalar coupling are quantified and discussed. The results are compared with the results of the WA102 collaboration at CERN. Most of the models of UGDF from the literature give a too small cross section as compared to the WA102 data... (More)

We discuss double-diffractive (double-elastic) production of the η′-meson in the pp→pη′p reaction within the formalism of unintegrated gluon distribution functions (UGDF). We estimate also the contribution of γ*γ*→η′ fusion. The distributions in the Feynman xF (or rapidity), transferred four-momenta squared between initial and final protons (t1,t2) and azimuthal angle difference between outgoing protons (Φ) are calculated. The deviations from the sin 2(Φ) dependence predicted by one-step vector-vector-pseudoscalar coupling are quantified and discussed. The results are compared with the results of the WA102 collaboration at CERN. Most of the models of UGDF from the literature give a too small cross section as compared to the WA102 data and predict angular distribution in relative azimuthal angle strongly asymmetric with respect to π/2 in disagreement with the WA102 data. This points to a different mechanism at the WA102 energy. Predictions for RHIC, Tevatron and LHC are given. We find that the normalization, t1,2 dependences as well as deviations from sin 2(Φ) of double-diffractive double-elastic cross section are extremely sensitive to the choice of UGDF. Possible implications for UGDFs are discussed. © 2007 The American Physical Society.

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author
publishing date
type
Contribution to journal
publication status
published
in
Physical Review D (Particles, Fields, Gravitation and Cosmology)
volume
75
issue
5
publisher
American Physical Society
external identifiers
  • scopus:33947289924
ISSN
1550-7998
DOI
10.1103/PhysRevD.75.054021
language
English
LU publication?
no
id
52880b4e-3291-41de-8577-c075160eebe6
date added to LUP
2016-08-18 21:14:29
date last changed
2017-01-01 08:32:16
@article{52880b4e-3291-41de-8577-c075160eebe6,
  abstract     = {<p>We discuss double-diffractive (double-elastic) production of the η′-meson in the pp→pη′p reaction within the formalism of unintegrated gluon distribution functions (UGDF). We estimate also the contribution of γ*γ*→η′ fusion. The distributions in the Feynman xF (or rapidity), transferred four-momenta squared between initial and final protons (t1,t2) and azimuthal angle difference between outgoing protons (Φ) are calculated. The deviations from the sin 2(Φ) dependence predicted by one-step vector-vector-pseudoscalar coupling are quantified and discussed. The results are compared with the results of the WA102 collaboration at CERN. Most of the models of UGDF from the literature give a too small cross section as compared to the WA102 data and predict angular distribution in relative azimuthal angle strongly asymmetric with respect to π/2 in disagreement with the WA102 data. This points to a different mechanism at the WA102 energy. Predictions for RHIC, Tevatron and LHC are given. We find that the normalization, t1,2 dependences as well as deviations from sin 2(Φ) of double-diffractive double-elastic cross section are extremely sensitive to the choice of UGDF. Possible implications for UGDFs are discussed. © 2007 The American Physical Society.</p>},
  articleno    = {054021},
  author       = {Szczurek, A. and Pasechnik, R. S. and Teryaev, O. V.},
  issn         = {1550-7998},
  language     = {eng},
  month        = {03},
  number       = {5},
  publisher    = {American Physical Society},
  series       = {Physical Review D (Particles, Fields, Gravitation and Cosmology)},
  title        = {pp→ppη′ reaction at high energies},
  url          = {http://dx.doi.org/10.1103/PhysRevD.75.054021},
  volume       = {75},
  year         = {2007},
}