pp→ppη′ reaction at high energies
(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
- Szczurek, A. ; Pasechnik, R. S. LU and Teryaev, O. V.
- publishing date
- 2007-03-16
- 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
- 2022-01-30 05:36:08
@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}}, }