# ICHEP 2022

Jul 6 – 13, 2022
Bologna, Italy
Europe/Rome 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

Jul 8, 2022, 7:05 PM
1h 25m
Bologna, Italy

#### Bologna, Italy

Palazzo della Cultura e dei Congressi
Poster Heavy Ions

### Speaker

Baidyanath Sahoo (IIT Bombay, Mumbai, India)

### Description

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 PYTHIA 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.

In-person participation No

### Primary author

Baidyanath Sahoo (IIT Bombay, Mumbai, India)

### Co-authors

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

### Presentation materials

 Baidya_poster_r2p2Spherocity.pdf Baidya_video_r2p2Spherocity.mp4