Central exclusive production of the scalar χc meson at the Fermilab Tevatron, BNL RHIC, and CERN LHC energies
(2008) In Physical Review D (Particles, Fields, Gravitation and Cosmology) 78(1). Abstract
We calculate several differential distributions for exclusive doublediffractive χc(0++) production in the protonantiproton collisions at the Tevatron and in protonproton collisions at RHIC and LHC. We use unintegrated gluon distributions (UGDFs) within the ktfactorization approach. The g*g*→χc(0++) transition vertex is calculated as a function of gluon virtualities via the standard perturbative nonrelativistic QCD technique. The off shell effects are discussed and quantified. They lead to a reduction of the cross section by a factor of 25, depending on the position in the phase space and UGDFs. Different models of UGDFs are used and the results are shown and discussed. The cross section for the diffractive component depends... (More)
We calculate several differential distributions for exclusive doublediffractive χc(0++) production in the protonantiproton collisions at the Tevatron and in protonproton collisions at RHIC and LHC. We use unintegrated gluon distributions (UGDFs) within the ktfactorization approach. The g*g*→χc(0++) transition vertex is calculated as a function of gluon virtualities via the standard perturbative nonrelativistic QCD technique. The off shell effects are discussed and quantified. They lead to a reduction of the cross section by a factor of 25, depending on the position in the phase space and UGDFs. Different models of UGDFs are used and the results are shown and discussed. The cross section for the diffractive component depends strongly on UGDFs. Transverse momentum distribution of χc(0) shows a well localized minimum. We calculate also the differential distributions for the γ*γ*→χc(0++) fusion mechanism. The integrated cross section for photonphoton fusion is much smaller than that of diffractive origin. The two components have very different dependence on the momentum transfers t1, t2 in the nucleon lines as well as azimuthalangle correlations between both outgoing nucleons. © 2008 The American Physical Society.
(Less)
 author
 Pasechnik, R. S. ^{LU} ; Szczurek, A. and Teryaev, O. V.
 publishing date
 20080709
 type
 Contribution to journal
 publication status
 published
 in
 Physical Review D (Particles, Fields, Gravitation and Cosmology)
 volume
 78
 issue
 1
 publisher
 American Physical Society
 external identifiers

 Scopus:48249098368
 ISSN
 15507998
 DOI
 10.1103/PhysRevD.78.014007
 language
 English
 LU publication?
 no
 id
 4555aff79e8d4f06b7ba437993727d8b
 date added to LUP
 20160818 21:12:56
 date last changed
 20160914 14:37:31
@misc{4555aff79e8d4f06b7ba437993727d8b, abstract = {<p>We calculate several differential distributions for exclusive doublediffractive χc(0++) production in the protonantiproton collisions at the Tevatron and in protonproton collisions at RHIC and LHC. We use unintegrated gluon distributions (UGDFs) within the ktfactorization approach. The g*g*→χc(0++) transition vertex is calculated as a function of gluon virtualities via the standard perturbative nonrelativistic QCD technique. The off shell effects are discussed and quantified. They lead to a reduction of the cross section by a factor of 25, depending on the position in the phase space and UGDFs. Different models of UGDFs are used and the results are shown and discussed. The cross section for the diffractive component depends strongly on UGDFs. Transverse momentum distribution of χc(0) shows a well localized minimum. We calculate also the differential distributions for the γ*γ*→χc(0++) fusion mechanism. The integrated cross section for photonphoton fusion is much smaller than that of diffractive origin. The two components have very different dependence on the momentum transfers t1, t2 in the nucleon lines as well as azimuthalangle correlations between both outgoing nucleons. © 2008 The American Physical Society.</p>}, author = {Pasechnik, R. S. and Szczurek, A. and Teryaev, O. V.}, issn = {15507998}, language = {eng}, month = {07}, number = {1}, publisher = {ARRAY(0x7e3b598)}, series = {Physical Review D (Particles, Fields, Gravitation and Cosmology)}, title = {Central exclusive production of the scalar χc meson at the Fermilab Tevatron, BNL RHIC, and CERN LHC energies}, url = {http://dx.doi.org/10.1103/PhysRevD.78.014007}, volume = {78}, year = {2008}, }