22nd Conference on Flavor Physics and CP Violation (FPCP 2024)

Observation of double J/ψ production in pPb collisions

30 May 2024, 14:30

15m

Chulalongkorn University

Parallel session Exotic quarkonium-like states Parallel - 9

Speaker

Zhen Hu (Tsinghua University (CN))

Description

The first observation of the concurrent production of two $\mathrm{J}/\psi$ mesons in proton-nucleus collisions will be presented. The analysis is based on a data sample recorded at a nucleon-nucleon center-of-mass energy of 8.16 TeV by the CMS experiment at the CERN LHC corresponding to an integrated luminosity of 174.6 ${\mathrm{n}\mathrm{b}}^{-1}$. The $\mathrm{J}/\psi$ mesons are reconstructed in their ${\mu }^{+}{\mu }^{-}$ decay channel for transverse momenta $p_{\mathrm{T}}>6.5$ GeV and rapidity $|y|<2.4$. The measured inclusive fiducial cross section $\sigma (\mathrm{p}\mathrm{P}\mathrm{b}\to \mathrm{J}/\psi \mathrm{J}/\psi +\mathrm{X})$ will be compared to theoretical perturbative quantum chromodynamics predictions at next-to-leading-order accuracy, including nuclear parton densities effects, for the production of two $\mathrm{J}/\psi$ mesons in single- (SPS) and double- (DPS) parton scatterings. The measurement of the double J/$\psi$ cross section in pp collisions at 13 TeV may also be reported.

Presentation materials

20240530_FPCP_ZhenHu.pdf

Peer reviewing

Paper

Accepted on 27 Oct 2024 by Phat Srimanobhas

Observations of double Jpsi in pPb collisions and triple Jpsi in pp collisions_v5.pdf