# 19th International Conference on Hadron Spectroscopy and Structure in memoriam Simon Eidelman

26-31 July 2021
Mexico City
Mexico/General timezone
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# Contribution Parallel

Mexico City -
Hadrons in Hot and Nuclear Environment Including Hypernuclei

# Study of bound states in a thermal gas using the S-matrix formalism

## Speakers

• Dr. Subhasis SAMANTA

## Abstract

We study how to include bound states in a thermal gas in the context of quantum field theory (QFT). We have used a scalar QFT with a $\phi^4$ interaction where the field $\phi$ represents a particle with mass $m$. We observe the creation of bound states when the coupling constant is negative and its modulus is larger than a certain critical value. Then we investigate the contribution of this bound state to the pressure of the thermal gas of the system by using the $S$-matrix formalism.