scholarly journals Geometry and Space-Time Extent of Pion Emission Region at FCC Energies

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
V. A. Okorokov
Keyword(s):  
Energy Dependence ◽  
Particle Density ◽  
Space Time ◽  
Emission Region ◽  
Proton Proton ◽  
Pion Emission ◽  
Charged Particle Density ◽  
Total Multiplicity ◽  
Bose Einstein ◽  
Smooth Approximations

The energy dependence is investigated for a wide set of space-time characteristics derived from Bose–Einstein correlations of secondary pion pairs produced in proton-proton and nucleus-nucleus interactions. Analytic functions suggested for smooth approximations of the energy dependence of emission region parameters demonstrate reasonable agreement with all available experimental results for proton-proton collisions while the approximations correspond to most of experimental data for nucleus-nucleus collisions at energies above 5 GeV. Estimations for a wide set of space-time quantities are obtained for energies for the Future Circular Collider (FCC) project based on the smooth approximations. The space particle densities at freeze-out are derived also from estimations for the volume of the emission region and for total multiplicity at FCC energies. Estimations for charged particle density and its critical value allow the possibility of lasing behavior for secondary pions in nucleus-nucleus collisions at FCC energy. The mathematical formalism is presented for study of the peak shape of correlation function for general case of central-symmetrical Lévy–Feldheim distribution.

scholarly journals Study of charged-particle multiplicity fluctuations in pp collisions with Monte Carlo event generators at the LHC

2020 ◽  
Vol 29 (09) ◽  
pp. 2050074
Author(s):  
E. Shokr ◽  
A. H. El-Farrash ◽  
A. De Roeck ◽  
M. A. Mahmoud
Keyword(s):  
Charged Particle ◽  
Particle Production ◽  
Local Density ◽  
Particle Density ◽  
Hadron Collider ◽  
Center Of Mass ◽  
Monte Carlo Event ◽  
Particle Multiplicity ◽  
Charged Particle Multiplicity ◽  
Proton Proton

Proton–Proton ([Formula: see text]) collisions at the Large Hadron Collider (LHC) are simulated in order to study events with a high local density of charged particles produced in narrow pseudorapidty windows of [Formula: see text] = 0.1, 0.2, and 0.5. The [Formula: see text] collisions are generated at center of mass energies of [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text] TeV, i.e., the energies at which the LHC has operated so far, using PYTHIA and HERWIG event generators. We have also studied the average of the maximum charged-particle density versus the event multiplicity for all events, using the different pseudorapidity windows. This study prepares for the multi-particle production background expected in a future search for anomalous high-density multiplicity fluctuations using the LHC data.

Space-time structure of the pion emission in central Au+Au collisions at RHIC energies

2021 ◽  
Author(s):  
Yevhen Kravchenko ◽  
Yevheniia Khyzhniak ◽  
Larissa V Bravina ◽  
Grigory Nigmatkulov ◽  
Yu M Sinyukov ◽  
...  
Keyword(s):  
Space Time ◽  
Time Structure ◽  
Pion Emission ◽  
Space Time Structure

scholarly journals Energy Dependence of Slope Parameter in Elastic Nucleon-Nucleon Scattering

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
V. A. Okorokov
Keyword(s):  
Experimental Data ◽  
Energy Dependence ◽  
Nucleon Nucleon ◽  
High Energy ◽  
Slope Parameter ◽  
Proton Antiproton ◽  
Proton Proton ◽  
Elastic Proton ◽  
Energy Domain ◽  
Very High Energy

The diffraction slope parameter is investigated for elastic proton-proton and proton-antiproton scattering based on all the available experimental data at low and intermediate momentum transfer values. Energy dependence of the elastic diffraction slope is approximated by various analytic functions. The expanded “standard” logarithmic approximations with minimum number of free parameters allow description of the experimental slopes in all the available energy range reasonably. The estimations of asymptotic shrinkage parameterαP′are obtained for various|t|domains based on all the available experimental data. Various approximations differ from each other both in the low energy and very high energy domains. Predictions for diffraction slope parameter are obtained for elastic proton-proton scattering from NICA up to future collider (FCC/VLHC) energies, for proton-antiproton elastic reaction in FAIR energy domain for various approximation functions.

scholarly journals Lévy Distributions for One-Dimensional Analysis of the Bose–Einstein Correlations

2017 ◽  
Vol 2017 ◽  
pp. 1-18 ◽  
Author(s):  
V. A. Okorokov
Keyword(s):  
Reasonable Agreement ◽  
Emission Region ◽  
General Study ◽  
Gaussian Distributions ◽  
One Dimensional ◽  
Interaction Processes ◽  
Special Cases ◽  
Centrally Symmetric ◽  
Bose Einstein ◽  
First Time

A general study of relations between the parameters of two centrally symmetric Lévy distributions, often used for one-dimensional investigation of Bose–Einstein correlations, is given for the first time. These relations of the strength of correlations and of the radius of the emission region take into account possible various finite ranges of the Lorentz invariant four-momentum difference for two centrally symmetric Lévy distributions. In particular, special cases of the relations are investigated for Cauchy and normal (Gaussian) distributions. The mathematical formalism is verified using the recent measurements given that a generalized centrally symmetric Lévy distribution is used. The reasonable agreement is observed between estimations and experimental results for all available types of strong interaction processes and collision energies.

scholarly journals Lévy HBT Results at NA61/SHINE

Universe ◽  
2019 ◽  
Vol 5 (6) ◽  
pp. 154 ◽  
Author(s):  
Barnabás Pórfy
Keyword(s):  
Source Parameters ◽  
High Energy ◽  
Space Time ◽  
Time Structure ◽  
Transverse Mass ◽  
Mass Dependence ◽  
Space Time Structure ◽  
Bose Einstein

Bose–Einstein (or Hanbury–Brown and Twiss (HBT)) momentum correlations reveal the space–time structure of the particle emitting source created in high energy nucleus–nucleus collisions. In this paper we present the latest NA61/SHINE measurements of Bose–Einstein correlations of identified pion pairs and their description based on Lévy distributed sources in Be + Be collisions at 150A GeV/c. We investigate the transverse mass dependence of the Lévy source parameters and discuss their possible interpretations.

Description of the energy dependence of proton-proton partial-wave amplitudes by means of O(4) expansions

1985 ◽  
Vol 32 (3) ◽  
pp. 575-585 ◽  
Author(s):  
J. Bystricky ◽  
P. LaFrance ◽  
F. Lehar ◽  
F. Perrot ◽  
P. Winternitz
Keyword(s):  
Partial Wave ◽  
Energy Dependence ◽  
Proton Proton

scholarly journals First Measurement of Bose-Einstein Correlations in Proton-Proton Collisions ats=0.9and 2.36 TeV at the LHC

2010 ◽  
Vol 105 (3) ◽  
Author(s):  
V. Khachatryan ◽  
A. M. Sirunyan ◽  
A. Tumasyan ◽  
W. Adam ◽  
T. Bergauer ◽  
...  
Keyword(s):  
Proton Proton ◽  
Proton Collisions ◽  
Bose Einstein ◽  
Proton Proton Collisions
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