Nov 25 – 29, 2019
University of Pavia
Europe/Rome timezone

Prompt hadroproduction of pseudoscalar charmonia in the k_T factorization approach

Nov 26, 2019, 11:30 AM
Aula Foscolo (University of Pavia)

Aula Foscolo

University of Pavia

Via Strada Nuova 65, Pavia


Wolfgang Schaefer (Institute of Nuclear Physics PAN)


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

Primary author

Wolfgang Schaefer (Institute of Nuclear Physics PAN)

Presentation materials