# 10th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions

May 31, 2020 to June 5, 2020
Online
US/Central timezone

## Nuclear modification and exclusive photoproduction of Upsilon in pPb collisions with the CMS experiment

Jun 2, 2020, 12:20 PM
20m
https://cern.zoom.us/j/99559895520

#### https://cern.zoom.us/j/99559895520

Oral Presentation Heavy Flavor and Quarkonia

### Speaker

Dr Ruchi Chudasama (Eotvos Lorand University (HU))

### Description

Results of nuclear modification of Upsilon production in pPb collisions at 5.02 TeV and exclusive Upsilon photoproduction in Ultraperipheral collisions (UPC) of pPb at 8.16 TeV, are presented. The nuclear modification factors in pPb collisions are measured to quantify nuclear effects in such a small system and sequential suppression is observed among the three states following the ordering of their binding energies. Exclusive photoproduction of Upsilon states in UPC of protons and Pb using data collected by the CMS in 2016 with an integrated luminosity of $178.4$ nb$^{-1}$, is presented. The $\Upsilon(1S)$ photoproduction cross-section is extracted in the region $|y|<2.2$ as a function of the photon-proton centre-of-mass energies $W_{\gamma p}$, which provides valuable information of the gluon distribution at small values of parton fractional momenta $x$. The results are compared to other experimental results as well as various theoretical predictions.

Collaboration (if applicable) CMS Contributed Talk Heavy Flavor and Quarkonia

### Primary author

Serguei Petrushanko (M.V. Lomonosov Moscow State University (RU))

### Presentation materials

 Recording ruchi_nuclear_mod_upsilon_HP.pdf