Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-09-06
Phys.Rev.D78:014007,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
34 pages, 23 figures, 2 tables
Scientific paper
10.1103/PhysRevD.78.014007
We calculate several differential distributions for exclusive double diffractive $\chi_c(0^{++})$ production in proton-antiproton collisions at the Tevatron and in proton-proton collisions at RHIC and LHC in terms of unintegrated gluon distributions (UGDFs) within the $k_t$-factorisation approach. The uncertainties of the Khoze-Martin-Ryskin approach are discussed in detail. The $g^* g^* \to \chi_c(0^{++})$ transition vertex is calculated as a function of gluon virtualities applying the standard pNRQCD technique. The off-shell effects are discussed and quantified. They lead to a reduction of the cross section by a factor 2--5, 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 diffractive component depends strongly on UGDFs. We calculate also the differential distributions for the $\gamma^* \gamma^* \to \chi_c(0^{++})$ fusion mechanism. The integrated cross section for photon-photon fusion is much smaller than that of diffractive origin. The two components have very different dependence on momentum transfers $t_1, t_2$ in the nucleon lines as well as azimuthal-angle correlations between both outgoing nucleons.
Pasechnik Roman S.
Szczurek Antoni
Teryaev Oleg V.
No associations
LandOfFree
Central exclusive production of scalar χ_c meson at the Tevatron, RHIC and LHC energies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Central exclusive production of scalar χ_c meson at the Tevatron, RHIC and LHC energies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Central exclusive production of scalar χ_c meson at the Tevatron, RHIC and LHC energies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-657893