Multiplicity Dependencies Of Midrapidity Transverse Momentum Spectra Of Identified Charged Particles In P Plus P Collisions At (S)(1/2)=13 Tev At Lhc

INTERNATIONAL JOURNAL OF MODERN PHYSICS A(2021)

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摘要
Multiplicity dependencies of midrapidity pt spectra of identified charged particles in inelastic p+p collisions at (s)(1/2) = 13 TeV at the Large Hadron Collider (LHC), measured by ALICE Collaboration, have been analyzed. The combined minimum chi(2) fits with thermodynamically consistent Tsallis function as well as Hagedorn function with the embedded transverse flow describe quite satisfactorily the pt spectra of particles in the studied 10 different classes of charged-particle multiplicity in inelastic p+p collisions at (s)(1/2) = 13 TeV. The obtained effective temperatures T of thermodynamically consistent Tsallis function demonstrate a consistent growth with an increase in multiplicity of charged particles in inelastic p+p collisions at (s)(1/2) = 13 TeV, and the corresponding T versus the average charged-particle (pseudorapidity) multiplicity density (< dN(ch)/d eta >) dependence is described very well by the simple power function with exponent parameter approximate to (1/3) in the whole analyzed range < dN(ch)/d eta > > 4. It is found that the transverse (radial) flow becomes significant at higher multiplicity events in p+p collisions at (s)(1/2) = 13 TeV, reaching the maximum value = 0.28 +/- 0.02 at the largest studied multiplicity density < dN(ch)/d eta > = 26.02 +/- 0.35. It is estimated from analysis of T0 and versus < dN(ch)/d eta > dependencies, obtained using Hagedorn function with the embedded transverse flow, that the probable onset of deconfinement phase transition in inelastic p+p collisions at (s)(1/2) = 13 TeV occurs at < dN(ch)/d eta > approximate to 7.1 +/- 0.2.
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关键词
Collective phenomena in proton-proton collisions at LHC, transverse momentum spectra of particles, nonextensive Tsallis statistics, Tsallis distribution function, nonextensivity parameter q, Hagedorn function with the embedded transverse flow, transverse (radial) flow velocity, effective temperature, kinetic freeze-out temperature, production of QGP droplet in high energy p plus p collisions, onset of deconfinement phase transition
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