PoS - Proceedings of Science
Volume 364 - European Physical Society Conference on High Energy Physics (EPS-HEP2019) - QCD and Hadronic Physics
Production of $\chi_c(i) \chi_c(j)$ pairs in proton-proton collisions in $k_t$-factorization and collinear approaches
W. Schaefer,* A. Cisek, I. Babiarz, A. Szczurek
*corresponding author
Full text: pdf
Pre-published on: June 10, 2020
Published on:
Here we present recent results of our calculations of χ c pair production, mainly in the single
parton scattering (SPS) mode. An important feature is that the single-gluon exchange mechanism
can to some extent mimic the behaviour of double parton scattering (DPS) production. Off-shell
matrix elements for $g ∗ g ∗ → χ_{cJ_1} χ_{cJ_2}$ were derived and then used in the k T -factorization approach
for the $pp → χ_{cJ_1} χ_{cJ_2}$ reaction. Different combination of the $χ_c$ mesons are considered. A similar
analysis is repeated for the collinear factorization approach, but now including the associated
production with a gluon (jet). The leading order contributions ($2 → 2$ processes) are rather small,
compared to the $k_T$-factorization result. But the addition of $2 → 3$ processes helps to recover the
latter results.
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.