scholarly journals Similarities in Multiparticle Production Processes in pp Collisions as Imprints of Nonextensive Statistics

Symmetry ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1339 ◽  
Author(s):  
Maciej Rybczynski ◽  
Zbigniew Wlodarczyk
Keyword(s):  
Transverse Momentum ◽  
Power Law ◽  
Charged Particles ◽  
Multiparticle Production ◽  
Common Mechanism ◽  
Power Indices ◽  
Pp Collisions ◽  
Nonextensive Statistics ◽  
Production Processes

The transverse momentum pT spectra of both hadrons and jets produced in pp collisions at beam energies from hundreds GeV to a few TeV exhibit power-law behavior of 1/pTn at high pT, with similar power indices n. The respective nonextensivity parameters for transverse momenta distributions and the global nonextensivity parameter obtained from multiplicities are compared. In particular, data on kaon to pion (charged particles) multiplicity ratio are analyzed, assuming that the reaction occurs in some nonextensive environment. The values of the corresponding nonextensivity parameters were found to be similar, strongly indicating the existence of a common mechanism behind all these observables.

TEST OF IDENTIFIED HADRON MULTIPLICITIES FOR NONEXTENSIVE STATISTICAL MODEL AT LHC ENERGIES

2014 ◽  
Vol 29 (03n04) ◽  
pp. 1450021
Author(s):  
T. WIBIG
Keyword(s):  
Transverse Momentum ◽  
Statistical Model ◽  
Multiparticle Production ◽  
Thermodynamical Parameter ◽  
Nonextensive Statistics ◽  
Hadron Multiplicity ◽  
Production Processes ◽  
Momentum Distributions ◽  
Parameter Values ◽  
Thermodynamical Model

We analyzed the identified hadron multiplicity predictions of the generalized thermodynamical model of the multiparticle production processes with nonextensive statistics. The multiplicities measured recently at LHC experiments seem to be consistent with this approach and thermodynamical parameter values are found already by analyzing transverse momentum distributions. The information about the mechanism of the strangeness suppression has been derived to some extent from multistrange hadron abundances.

scholarly journals The imprints of superstatistics in multiparticle production processes

Open Physics ◽  
2012 ◽  
Vol 10 (3) ◽  
Author(s):  
Grzegorz Wilk ◽  
Zbigniew Włodarczyk
Keyword(s):  
Uncertainty Relation ◽  
Sum Rules ◽  
Nucleon Nucleon ◽  
Multiparticle Production ◽  
Nuclear Collisions ◽  
Nonextensive Statistics ◽  
Production Processes ◽  
Tsallis Distribution ◽  
Power Law Distributions ◽  
Ubiquitous Presence

AbstractWe provide an update of the overview of imprints of Tsallis nonextensive statistics seen in a multiparticle production processes. They reveal an ubiquitous presence of power law distributions of different variables characterized by the nonextensivity parameter q > 1. In nuclear collisions one additionally observes a q-dependence of the multiplicity fluctuations reflecting the finiteness of the hadronizing source. We present sum rules connecting parameters q obtained from an analysis of different observables, which allows us to combine different kinds of fluctuations seen in the data and analyze an ensemble in which the energy (E), temperature (T) and multiplicity (N) can all fluctuate. This results in a generalization of the so called Lindhard’s thermodynamic uncertainty relation. Finally, based on the example of nucleus-nucleus collisions (treated as a quasi-superposition of nucleon-nucleon collisions) we demonstrate that, for the standard Tsallis entropy with degree of nonextensivity q < 1, the corresponding standard Tsallis distribution is described by q′ = 2 − q > 1.

scholarly journals A Description of the Transverse Momentum Distributions of Charged Particles Produced in Heavy Ion Collisions at RHIC and LHC Energies

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Jia-Qi Hui ◽  
Zhi-Jin Jiang ◽  
Dong-Fang Xu
Keyword(s):  
Transverse Momentum ◽  
Heavy Ion Collisions ◽  
Good Description ◽  
Charged Particles ◽  
Heavy Ion ◽  
Ion Collisions ◽  
Nonextensive Statistics ◽  
Long Range Interactions ◽  
Momentum Distributions ◽  
Momentum Region

By assuming the existence of memory effects and long-range interactions, nonextensive statistics together with relativistic hydrodynamics including phase transition are used to discuss the transverse momentum distributions of charged particles produced in heavy ion collisions. It is shown that the combined contributions from nonextensive statistics and hydrodynamics can give a good description of the experimental data in Au+Au collisions at sNN=200 GeV and in Pb+Pb collisions at sNN=2.76 TeV for π± and K± in the whole measured transverse momentum region and for pp- in the region of pT≤2.0 GeV/c. This is different from our previous work using the conventional statistics plus hydrodynamics, where the describable region is only limited in pT≤1.1 GeV/c.

scholarly journals Study of long-lived heavy charged particles produced in pp collisions at energy 13 TeV

2017 ◽  
Vol 33 (3) ◽  
Author(s):  
Chung Nguyen Mau
Keyword(s):  
Transverse Momentum ◽  
Invariant Mass ◽  
Center Of Mass ◽  
Charged Particles ◽  
Susy Particle ◽  
Pp Collisions ◽  
Heavy Charged Particles ◽  
Opposite Charge ◽  
Preliminary Results ◽  
Lhcb Detector

We are interested in long-lived heavy charged particles because they would be possible SUSY particle candidats. This paper shows our preliminary results of long-lived heavy charged particles generation using  PYTHIA 8. More than 107 events have been generated with pp  collisions at energy in the center of mass = 13 TeV and about  3.27 105  long-lived heavy charged particles candidates have been found in the geometric acceptance of the LHCb detector. Long-lived  heavy charged particles has mass 1.025 TeV/c2 and lifetime   157.7 nanoseconds, therefore they can travel throughout all subdetectors.  We try not only calculate their acceptance in function of  transverse momentum  and rapidity but also combine a pair of candidats  with opposite charge in order to reconstruct their invariant mass. In the next step, we have intention to identify stau using the informations from subdetectors such as the inner tracker and the muon chambers.

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