QFT treatment of a bound state in a thermal gas

@article{Samanta2020QFTTO,
  title={QFT treatment of a bound state in a thermal gas},
  author={Subhasis Samanta and Francesco Giacosa},
  journal={arXiv: High Energy Physics - Phenomenology},
  year={2020}
}
We investigate how to include bound states in a thermal gas in the context of quantum field theory (QFT). To this end, we use for definiteness a scalar QFT with a $\varphi^{4}$ interaction, where the field $\varphi$ represents a particle with mass $m$. A bound state of the $\varphi$-$\varphi$ type is created when the coupling constant is negative and its modulus is larger than a certain critical value. We investigate the contribution of this bound state to the pressure of the thermal gas of the… Expand
Thermal role of bound states and resonances in scalar QFT
We study the thermal properties of quantum field theories (QFT) with three-leg interaction vertices gφ and gSφ (φ and S being scalar fields), which constitute the relativistic counterpart of theExpand

References

SHOWING 1-10 OF 82 REFERENCES
Is X(3872) a bound state?
All existing experimental evidence of the bound state nature of the $X(3872)$ relies on considering its decay products with a finite experimental spectral mass resolution which is typically $\Delta mExpand
Cancellation of the $\sigma$ meson in thermal models
The by now well-established scalar-isoscalar resonance $f_{0}(500)$ (the $\sigma$ meson) seems potentially relevant in the evaluation of thermodynamic quantities of a hadronic gas, since its mass isExpand
Counting states and the Hadron Resonance Gas: Does X(3872) count?
Abstract We analyze how the renowned X(3872), a weakly bound state right below the D D ¯ ⁎ threshold, should effectively be included in a hadronic representation of the QCD partition function. ThisExpand
Thermodynamics of a gas of hadrons with attractive and repulsive interactions within an S -matrix formalism
We report the effect of including repulsive interactions on various thermodynamic observables calculated using a S-matrix based Hadron Resonance Gas (HRG) model to already available correspondingExpand
Interacting hadron resonance gas model in K-matrix formalism
An extension of Hadron Resonance Gas (HRG) model is constructed to include interactions using relativis- tic virial expansion of partition function. The non-interacting part of the expansion containsExpand
Measurement of the mass difference and the binding energy of the hypertriton and antihypertriton
According to the CPT theorem, which states that the combined operation of charge conjugation, parity transformation and time reversal must be conserved, particles and their antiparticles should haveExpand
Light nuclei production as a probe of the QCD phase diagram
Abstract It is generally believed that the quark-hadron transition at small values of baryon chemical potentials μ B is a crossover but changes to a first-order phase transition with an associatedExpand
Thermal properties of interacting hadrons
Abstract We study hadronic matter at temperatures close to the pion mass. In the dilute-gas stage, the relativistic virial expansion is used with empirical phase shifts to investigate theExpand
Thermal contribution of unstable states
Within the framework of the Lee model, we analyze in detail the difference between the energy derivative of the phase shift and the standard spectral function of the unstable state. The fact that theExpand
Measurement of the mass difference and the binding energy of the hypertriton and antihypertriton
Using the STAR (Solenoidal Tracker At RHIC) detector at the Relativistic Heavy Ion Collider (RHIC), we have measured the $\Lambda$ hyperon binding energy $B_\Lambda$ for the hypertriton, which is theExpand
...
1
2
3
4
5
...