Speaker
Description
study the $p_{T}$ spectra of light-flavor hadrons in different charged-particle multiplicities for $p + p$ collisions at $\sqrt{s} = 7$ TeV
we present the published data of ALICE at the mid-rapidity region to study the $p_{T}$
spectra of light-flavor hadrons in different charged-particle multiplicities
($\frac{d N_{ch}}{d \eta}$) for $p + p$ collisions at $\sqrt{s} = 7$ TeV.
We parametrize the $p_{T}$ spectra of different hadrons such as
pion ($\pi^{+} + \pi^{-}$), kaon ($K^{+} + K^{-}$), $K_{S}^0$, $K^{*0}$ ($K^{*0} + \bar{K^{*0}}$), $\phi$,
proton (p + $\bar{p}$), lambda ($\Lambda + \bar{\Lambda}$), cascade ($\Xi^{-} + \bar{\Xi}^{+}$) and
omega ($\Omega^{-} + \bar {\Omega}^{+}$) using Tsallis distribution.
We perform this analysis by considering both differential and single freeze-out scenarios.
In a differential freeze-out scenario, we notice that, the Tsallis parameter $n$
increases with multiplicity for most of the particles. This implies that
the multi-partonic interactions increase the multiplicities in $p+p$ collisions, bringing the system towards thermal equilibrium.
The value of parameter $T$ increases with the mass of the hadrons and increases with the multiplicity. This supports the differential freeze-out scenario and suggests that massive particles freeze-out earlier from the system.
In the case of a single freeze-out scenario, the value of the parameter
$n$ has a little variation with multiplicity and the parameter $T$ increases
with multiplicity. This implies that the degree of thermalization remains similar for
the events of different multiplicity classes.
| Field of contribution | Phenomenology |
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