https://doi.org/10.1140/epja/s10050-020-00138-4
Regular Article – Experimental Physics
Multiplicity dependence of J/
production and QCD dynamics in 
collisions at 
= 13 TeV
1
Discipline of Physics, School of Basic Sciences, Indian Institute of Technology Indore, Simrol, Indore, 453552, India
2
Present address: School of Physical Sciences, National Institute of Science Education and Research, HBNI, Jatni, 752050, India
* e-mail: Raghunath.Sahoo@cern.ch
Received:
17
May
2019
Accepted:
1
April
2020
Published online:
19
May
2020
In inelastic collisions, the interacting objects are quarks and gluons (partons). It is believed that there are multiple interactions between the partons in a single event. Recent studies of multiplicity dependence of particle production in collisions have gathered considerable interest in the scientific community. According to several theoretical calculations, multiple gluon participation in hadronic collisions is the cause of high-multiplicity events. If the interaction is hard enough (large 
transfer), the semi-hard processes of multiple interactions of partons might also lead to the production of heavy particles like J/. At the LHC, an approximately linear increase of the relative J/ yield with charged particle multiplicity is observed in collisions. In the present work, we have studied the contribution of quarks and gluons to the multiplicity dependence of J/ production using pQCD inspired event generator, PYTHIA8 tune 4C, in collisions at 
13 TeV by investigating relative J/ yield and relative 
of J/ as a function of charged particle multiplicity for different hard-QCD processes. We have estimated a newly defined ratio, 
, to gain understanding of J/ production in high-multiplicity collisions. For the first time we attempt to study the nuclear modification factor-like observables (
and 
) to describe the QCD medium formed in high-multiplicity collisions.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2020
