Constraints for nuclear PDFs from the LHCb D-meson data

Apr 11, 2019, 9:10 AM
Rettorato - Aula Magna

Rettorato - Aula Magna

Via Verdi, 8 Turin
Parallel Session Talk WG1: Structure Functions and Parton Densities WG1:Structure Functions and Parton Densities


Hannu Paukkunen (University of Jyväskylä)


We quantify the impact of LHCb D-meson measurements at $\sqrt{s}=5\,{\rm TeV}$ on the EPPS16 and nCTEQ15 nuclear PDFs. In our study, the theoretical description of D-meson production is based on the recently developed SACOT-$m_{\rm T}$ variant of the general-mass variable-flavour-number formalism, and the impact on PDFs is estimated via profiling methods. We pay a special attention on the theoretical uncertainties known to us, and are led to exclude the $p_{\rm T}<3\,{\rm GeV}$ region from our main analysis. The LHCb data can be accomodated well within EPPS16/nCTEQ15, and the data provide stringent constraints on the gluons at the shadowing/antishadowing regions. No evidence of non-linear effects beyond standard DGLAP evolution is found even if the full kinematic region down to zero $p_{\rm T}$ is considered.

Primary authors

Hannu Paukkunen (University of Jyväskylä) Kari J. Eskola (University of Jyvaskyla) Petja Paakkinen (University of Jyväskylä) Dr Ilkka Helenius (University of Jyväskylä)

Presentation materials