Workshop on Resummation, Evolution, Factorization (REF 2019)

Prompt hadroproduction of pseudoscalar charmonia in the k_T factorization approach

Nov 26, 2019, 11:30 AM

20m

Aula Foscolo (University of Pavia)

Tuesday 2

Speaker

Wolfgang Schaefer (Institute of Nuclear Physics PAN)

Description

We present our recent calculations on the production of pseudoscalar charmonia eta_c(1S) and eta_c(2S) in the k_T factorization approach. We discuss the regions of longitudinal and transverse momenta of gluons probed in the kinematics of the LHCb or ATLAS experiments.
The crucial ingredient is the off-shell matrix element, which in this case is
related to a g^g^eta_c form factor. Its calculation proceeds analogously to the gamma^ gamma^ eta_c form factor obtained in terms of the light front wave function of the charmonium in [1].
We compare our results to recent LHCb data and discuss the sensitivity
to the choice of the unintegrated gluon distribution.

[1] I.~Babiarz, V.~P.~Goncalves, R.~Pasechnik, W.~Schäfer and A.~Szczurek,
Phys. Rev. D 100 (2019) no.5, 054018

Presentation materials

WS_REF.pdf