Constraining nPDFs with Drell-Yan production in pPb collisions with the CMS experiment

Jun 2, 2020, 7:30 AM
1h 20m
Online

Online

Poster Presentation Electroweak Probes Poster session

Speaker

Émilien Chapon (Chinese Academy of Sciences (CN))

Description

Nuclear parton distribution functions (nPDFs) of quarks and antiquarks affect the production of electroweak bosons in proton-lead (pPb) collisions. In this presentation, a new measurement of the Drell-Yan (DY) process is presented in pPb collision at the center of mass energy of 8.16 TeV with the CMS detector. The rapidity dependence of this process is particularly sensitive to nPDFs, but further information can be gained by studying the mass dependence of DY production, measured for the first time in pPb collisions at 8.16 TeV, down to 15 GeV. In addition, differential measurements in the dimuon $p_{\text{T}}$ or $\phi^{*}$ (an angular variable correlated with $p_{\text{T}}$ measured for the first time in pPb) provide insights on soft gluon emission at low $p_{\text{T}}$. Comparisons to theory calculations show that these data are sensitive to the presence of nuclear modifications to the parton distributions in the lead nucleus, and can help improve and constrain theoretical calculations.

Contribution type Contributed Talk
Track Electroweak Probes
Collaboration (if applicable) CMS

Primary authors

Serguei Petrushanko (M.V. Lomonosov Moscow State University (RU)) Émilien Chapon (Chinese Academy of Sciences (CN))

Presentation materials