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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.

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author
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publishing date
type
Contribution to journal
publication status
published
in
Physical Review D (Particles, Fields, Gravitation and Cosmology)
volume
75
issue
5
article number
054021
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
2025-10-14 09:31:23
@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.</p>}},
  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}},
  doi          = {{10.1103/PhysRevD.75.054021}},
  volume       = {{75}},
  year         = {{2007}},
}