Small-x QCD studies with CMS at the LHC

TL;DR

This paper discusses CMS experiment measurements at the LHC aimed at exploring low-x parton structure and QCD evolution in protons and nuclei through various high-energy collision studies.

Contribution

It presents four new measurements at the LHC that probe low-x QCD phenomena in proton and nuclear collisions, expanding understanding of parton dynamics.

Findings

Charged hadron rapidity density measurement in Pb-Pb collisions

Ultraperipheral Upsilon production analysis

Inclusive forward jet measurements in p-p collisions

Abstract

The capabilities of the CMS experiment to study the low-x parton structure and QCD evolution in the proton and the nucleus at LHC energies are presented through four different measurements, to be carried out in Pb-Pb at sqrt(s_NN) = 5.5 TeV: (i) the charged hadron rapidity density $dN_{ch}/d\eta$ and (ii) the ultraperipheral (photo)production of Upsilon; and in p-p at sqrt(s) = 14 TeV: (iii) inclusive forward jets and (iv) Mueller-Navelet dijets (separated by $Delta\eta\gtrsim$ 8).