May 16 – 20, 2022
Europe/Zurich timezone

Transverse Spherocity and Multiplicity Dependence of $R_{2}$ and $P_{2}$ Correlation Functions in pp Collisions at $\sqrt{\textit{s}}$ = 7 TeV Using PYTHIA8

May 17, 2022, 7:00 PM
Experimental poster QCD Physics Poster Session I


Baidyanath Sahoo (IIT- Indian Institute of Technology (IN))


Event shape observables such as transverse spherocity($S_{0}$) have evolved as a
powerful tool to separate soft and hard contributions in an event in small collision
systems. To understand this phenomenon, we used two-particle differential-number
correlation functions, $R_{2}$, and transverse momentum correlation functions, $P_{2}$, of
charged particles produced in pp collisions at the LHC center-of-mass energy
$\sqrt{\textit{s}}$ = 7 TeV with the PYTHIA8 model. The $\Delta\varphi$-dependance of these correlation
functions in different multiplicity and $S_{0}$ classes are discussed . We find that these
correlation functions exhibit different shapes and sizes in both near-side(NS)
and away-side(AS) with multiplicity and $S_{0}$ classes. We see a strong correlation
in the NS and AS of these correlation functions for low-$S_{0}$(jetty-like),
which become weaker for high-$S_{0}$(isotropic). In addition, mean-$\textit{p}_{\rm T}$ of charged
particles for low-$S_{0}$, high-$S_{0}$ and $S_{0}$-integrated are discussed. Finally, it was
observed that $S_{0}$ should be a good observable as compared to multiplicity to
disentangle jetty and isotropic events in a small collision system.

Primary author

Baidyanath Sahoo (IIT- Indian Institute of Technology (IN))


Basanta Kumar Nandi (IIT- Indian Institute of Technology (IN)) Sadhana Dash (IIT- Indian Institute of Technology (IN)) Claude Andre Pruneau (Wayne State University (US))

Presentation materials