Nonperturbative and spin effects in the central exclusive production of tensor $χ_c(2^+)$ meson

Details Nonperturbative and spin effects in the central exclusive production of tensor $χ_c(2^+)$ meson Nonperturbative and spin effects in the central exclusive production of tensor $χ_c(2^+)$ meson

2009-12-21

arxiv.org/abs/0912.4251v4

Phys.Rev.D81:034024,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 12 figures, discrepancies with Durham group results clarified, numerics corrected, basic conclusions unchanged, ackn

Scientific paper

10.1103/PhysRevD.81.034024

We discuss central exclusive production (CEP) of the tensor $\chi_c(2^{+})$ meson in proton-(anti)proton collisions at Tevatron, RHIC and LHC energies. The amplitude for the process is derived within the $k_t$-factorisation approach. Differential and total cross sections are calculated for several unintegrated gluon distributions (UGDFs). We compare exclusive production of all charmonium states $\chi_c(0^+),\,\chi_c(1^+)$ and $\chi_c(2^+)$. Equally good description of the recent Tevatron data is achieved both with Martin-Ryskin phenomenological UGDF and UGDF based on unified BFKL-DGLAP approach. Unlike for Higgs production, the main contribution to the diffractive amplitude of heavy quarkonia comes from nonperturbative region of gluon transverse momenta $Q_{\perp}<1\,\GeV$. At $y \approx$ 0, depending on UGDF we predict the contribution of $\chi_c(1^+,2^+)$ to the $J/\Psi + \gamma$ channel to be comparable or larger than that of the $\chi_c(0^+)$ one. This is partially due to a significant contribution from lower polarization states $\lambda=0$ for $\chi_c(1^+)$ and $\lambda=0,\,\pm 1$ for $\chi_c(2^+)$ meson. Corresponding theoretical uncertainties are discussed.

Affiliated with

Also associated with

No associations

Rating

Nonperturbative and spin effects in the central exclusive production of tensor $χ_c(2^+)$ meson 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 Nonperturbative and spin effects in the central exclusive production of tensor $χ_c(2^+)$ meson, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nonperturbative and spin effects in the central exclusive production of tensor $χ_c(2^+)$ meson will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-305361