A study of maximum pseudorapidity gap distributions in 16O-nucleus interactions at 3.7, 60 and 200A GeV/c

2021 ◽  
Author(s):  
M. Mohisin Khan ◽  
Danish Meer ◽  
Waseem Bari ◽  
Shakeel Ahmad
Keyword(s):  
Incident Energy ◽  
Charged Particles ◽  
Simulated Data ◽  
Experimental Results ◽  
Multiparticle Production ◽  
Nuclear Interactions

The main aim of this paper is to present some interesting results on event-by-event maximum 2-particle gap ([Formula: see text]) in the pseudorapidity space of the relativistic charged particles [Formula: see text] produced in the [Formula: see text]O-AgBr interactions at 3.7, 60 and 200[Formula: see text]A GeV/c. The distribution of [Formula: see text] has been obtained for the experimental and AMPT simulated data. Distinct peaks are obtained in the [Formula: see text]-distributions of the relativistic charged particles in low [Formula: see text]-region. Further, the position of the peak is found to depend on the incident energy. The experimental results are not well supported by the results obtained for the AMPT simulated data. The findings presented here may be found useful in understanding the mechanism of the multiparticle production in relativistic nuclear interactions.

Transverse momentum distribution of primary charged particles in p–Pb interactions at forward pseudorapidity at LHC energies

2017 ◽  
Vol 26 (04) ◽  
pp. 1750021 ◽  
Author(s):  
Y. Ali ◽  
N. Ullah Jan ◽  
U. Tabassam ◽  
M. Suleymanov ◽  
A. S. Bhatti
Keyword(s):  
Transverse Momentum ◽  
Incident Energy ◽  
Charged Particles ◽  
Simulated Data ◽  
Event Generator ◽  
High Transverse Momentum ◽  
Nuclear Modification Factor ◽  
Nuclear Modification ◽  
Momentum Distributions ◽  
Modification Factor

Transverse momentum distributions of primary charged particles have been studied using simulated data from the HIJING 1.0 event generator in the minimum bias p–Pb collisions at [Formula: see text] = 0.9, 1.8, 2.76 and 5.02[Formula: see text], in the two forward pseudorapidity ([Formula: see text]) regions: [Formula: see text] and [Formula: see text] and in the transverse momentum range of [Formula: see text]. The simulated data in the pseudorapidity region of [Formula: see text] at 5.02[Formula: see text] depicts some differences in the region of [Formula: see text] [Formula: see text] 2[Formula: see text] when compared with CMS data. Model shows systematically higher values than the experimental measurements pointing out absorption effect for the experimental data. It is also observed that with increasing rapidity interval from [Formula: see text] to [Formula: see text] observed differences for the behavior of the transverse momentum distributions are shifted to high transverse momentum region. The nuclear modification factor as a function of transverse momentum is constructed using the HIJING 1.0 code. With incident energy, the values of nuclear modification factor increase, for 0.9 and 1.8 [Formula: see text], the distributions seem to increase, but for 2.76 and 5.02 [Formula: see text], the distributions look flat. Numerically, the value of nuclear modification factor increases with the increase in the number of jets. This result shows that for the considered more forward pseudorapidiry area, the influence of the incident energy dominates and this is the reason that main results in the areas are connected with the leading particles.

Study of transverse momentum and nuclear modification factors distribution of charged particles produced in pp and Pb–Pb collisions at s NN = 2.76TeV and 5.02TeV

2021 ◽  
pp. 2150068
Author(s):  
A. Arif ◽  
Y. Ali ◽  
M. Haseeb ◽  
Q. Ali ◽  
U. Tabassam ◽  
...  
Keyword(s):  
Experimental Data ◽  
Transverse Momentum ◽  
Charged Particles ◽  
Simulated Data ◽  
Experimental Results ◽  
High Transverse Momentum ◽  
Momentum Range ◽  
Nuclear Modification Factor ◽  
Nuclear Modification ◽  
Nuclear Modification Factors

We have studied transverse momentum distributions of charged particles produced in pp and Pb–Pb collisions at [Formula: see text] TeV and 5.02 TeV in the pseudorapidity interval [Formula: see text] and transverse momentum range [Formula: see text][Formula: see text]GeV/[Formula: see text]. We simulated data using EPOS-LHC, EPOS-1.99 and QGSJETII-04 models. The simulation data is compared with the ALICE experimental data values at [Formula: see text] TeV and 5.02 TeV for pp and most central Pb–Pb collisions. It has been observed that, EPOS-LHC and QGSJETII-04 models explain the experimental results for pp collision at [Formula: see text] TeV and 5.02 TeV. The behavior of nuclear modification factors has been studied. The simulation codes of all three models EPOS-LHC, EPOS-1.99 and QGSJETII-04 overestimate the experimental results at low transverse momentum interval: [Formula: see text] GeV/[Formula: see text], for Pb–Pb collisions at [Formula: see text] TeV and 5.02 TeV. However, only EPOS-LHC model can explain the experimental data at high transverse momentum in the range: [Formula: see text] GeV/[Formula: see text]. EPOS-1.99 and QGSJETII-04 underestimate in the region of Cronin effect and cannot give satisfactory estimates for the [Formula: see text] values for which [Formula: see text] demonstrates stronger suppression because of the collective parton effect. It can be inferred that these effects are not taken into account in EPOS-1.99 and QGSJETII-04 models. These models, however, satisfactorily explain the ALICE experimental data in the ranges of [Formula: see text] for which nuclear modification factor [Formula: see text] shows rising trend.

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.

A study of a disintegration produced by a particle of energy ~20 000 GeV

1954 ◽  
Vol 221 (1146) ◽  
pp. 367-383 ◽  
Keyword(s):  
Charged Particle ◽  
Large Fraction ◽  
Charged Particles ◽  
High Energy ◽  
Interaction Length ◽  
Nuclear Disintegration ◽  
A Value ◽  
Different Types ◽  
Nuclear Interactions

A detailed investigation has been made of a nuclear disintegration produced by a charged particle, almost certainly a proton, of energy ~20 000 GeV. The disintegration, of type 22 + 76 p , was recorded in a stack of plates exposed at ~90 000 ft. The jet of secondary charged particles, and the associated cascade of electrons and photons, can be followed through the emulsion of twenty-two plates. The observations lead to a value 0⋅25 for the ratio of neutral π -particles to charged shower particles produced in the disintegration. If π 0 -mesons are produced in high-energy nuclear interactions with a frequency half that of the charged π -mesons, and if 10% of the shower particles are assumed to be protons, the present results indicate that 40 % of the charged shower particles are other than π -mesons. As there is no evidence for the existence of nucleon pairs, it is reasonable to identify these other particles with the heavy k -particles. The corresponding ratio of the numbers of charged k - to π-mesons, N K ±/ N π ±, is equal to 0⋅80±0·4. The interaction length of the shower particles from the event, measured without distinction between the different types of mesons which may be among them, is shown to be very nearly equal to the value for nucleons. It follows that the k -mesons, which constitute a large fraction of the shower particles, interact strongly with nuclei.

He DIFFRACTION FROM Ag(110) SURFACE

1992 ◽  
Vol 06 (01) ◽  
pp. 109-123
Author(s):  
M. ARTUNÇ ◽  
M. CEYLAN ◽  
N. KOLSUZ
Keyword(s):  
Incident Energy ◽  
Incident Angle ◽  
Van Der Waals ◽  
Experimental Results ◽  
Coupling Method ◽  
Close Coupling ◽  
Softness Parameter ◽  
Well Depth ◽  
Good Agreement ◽  
Mie Potential

Using the exact close-coupling method we have investigated the diffraction intensities of He atoms from a Ag(110) surface. He-Ag(110) interaction is represented by a corrugated Mie potential. In our calculations we have used three different well depths D. Diffraction intensities were calculated for x = <001> direction. The softness parameter β is optimized for a given incident energy Ei and incident angle θi so as to reproduce the experimental results. Using well depth D and van der Waals constant C3 for six He-metal (Al, Ni, Cu, Ag, Pt, Au) systems we have obtained a relation, D = 0.070C3 − 9.006, between parameters D and C3. Our results are in good agreement with experimental observations.

Characteristics of the total disintegration of AgBr nuclei by 24Mg and 32S nuclei at 4.5 A GeV/c

2000 ◽  
Vol 78 (10) ◽  
pp. 915-927 ◽  
Author(s):  
N N Abd-Allah
Keyword(s):  
Free Path ◽  
Incident Energy ◽  
Charged Particles ◽  
Mean Free Path ◽  
Average Multiplicity ◽  
Multiplicity Distributions ◽  
Inelastic Mean Free Path ◽  
Good Agreement ◽  
Fireball Model

The interactions of 4.5 A GeV/c 24Mg and 32S nuclei with emulsion were studied. The experimental inelastic mean free path for these interactions is compared with theoretically calculated values. The average multiplicities of the emitted secondary charged particles for total disintegration were investigated. Total disintegration events are analysed to investigate the characteristics of secondary charged particles produced in such collisions. The results show that the multiplicity distributions of relativistic charged particles agree with the Gaussion distribution. The average multiplicity of grey and black particles is in good agreement with the prediction of the fireball model. The probabilty of total disintegration of Ag(Br) nuclei by different projectiles is nearly independent of the incident energy. PACS No.: 25.70

Experimental results on proton-proton interactions at 10 GeV/c with six charged particles in the final state

1968 ◽  
Vol 57 (1) ◽  
pp. 20-38 ◽  
Author(s):  
S. O. Holmgren ◽  
S. Nilsson ◽  
T. Olhede ◽  
N. Yamdagni
Keyword(s):  
Charged Particles ◽  
Experimental Results ◽  
Final State ◽  
Proton Proton

Calculations of average characteristics of EAS components and Monte Carlo calculations of their fluctuations using different models of nuclear interactions. II. Muons

1968 ◽  
Vol 46 (10) ◽  
pp. S153-S158 ◽  
Author(s):  
G. T. Murthy ◽  
K. Sivaprasad ◽  
M. V. Srinivasa Rao ◽  
S. C. Tonwar ◽  
R. H. Vatcha ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Experimental Results ◽  
Energy Spectra ◽  
Muon Component ◽  
Monte Carlo Calculations ◽  
Nuclear Interactions ◽  
Shower Size

The results pertaining to the muon component obtained in the calculations described in Part I are presented. The predicted lateral distributions and energy spectra of muons with energies above various thresholds are compared with experimental observations. Also presented are the expected variations of the number of muons with shower size compared with experimental results. None of the models assumed predict in every detail the results obtained experimentally. Modifications that could possibly be made are indicated.

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