Pion $p_T$ spectra in $p+p$ collisions as a function of $\sqrt{s}$ and event multiplicity

TL;DR

This paper analyzes charged pion transverse momentum spectra in proton-proton collisions across various energies and event multiplicities using Tsallis distribution, revealing increased hard process contributions at higher energies and multiplicities.

Contribution

It provides a comprehensive parameterization of Tsallis distribution parameters as functions of collision energy and multiplicity, offering new insights into pion production mechanisms.

Findings

Tsallis parameters increase with collision energy, indicating more hard processes.

Parameter behavior is independent of collision energy at fixed multiplicity.

Pion spectra shape varies with event multiplicity, consistent across energies.

Abstract

We study the charged pion transverse momentum ($p_T$) spectra in $p$+$p$ collisions as a function of collision energy $\sqrt{s}$ and event multiplicity using Tsallis distribution. This study gives an insight of the pion production process in $p+p$ collisions. The study covers pion spectra measured in $p+p$ collisions at SPS energies (6.27-17.27 GeV), RHIC energies (62.4 GeV and 200 GeV) and LHC energies (900 GeV, 2.76 TeV and 7 TeV). The Tsallis parameters have been obtained and parameterized as a function of $\sqrt{s}$. The study suggests that as we move to higher energy more and more hard processes contribute to the spectra. We also study the charged pion spectra for different event multiplicities in $p$+$p$ collisions for LHC energies using Tsallis distribution. The variation of the Tsallis parameters as a function of event multiplicity has been obtained and their behavior is found to be independent of collision energy.