Multiplicity and multiplicity correlations in 800 GeV proton-emulsion nucleus interactions

Shivpuri, R. K.; Prasad, Anusuya

doi:10.1088/0031-8949/39/3/003

Cited by 3 publications

(2 citation statements)

References 30 publications

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“…Therefore, in this case, the events could be an admixture of CNO events and peripheral AgBr events. It has been specifically pointed out that [27][28][29] events with 2 N h 5 are pure CNO events and events with 6 N h 8 are CNO events with an admixture of events generated from peripheral collisions between the projectile and AgBr target. In this analysis, we have not considered those events, which have 2 N h 8.…”

Section: Target Identification In Emulsion Detector and Experimental ...mentioning

confidence: 99%

Forward–backward multiplicity correlation in high-energy nucleus–nucleus interactions at a few AGeV/c

Bhattacharyya¹,

Neagu²,

Firu³

2014

J. Phys. G: Nucl. Part. Phys.

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We have presented a systematic study of two-particle rapidity correlations in terms of investigating the dynamical fluctuation observable σ 2 c in the forwardbackward pseudo-rapidity windows by analyzing the experimental data of 16 O-AgBr interactions at 4.5 AGeV/c, 22 Ne-AgBr interactions at 4.1 AGeV/c, 28 Si-AgBr and 32 S-AgBr interactions at 4.5 AGeV/c. The experimental results have been compared with the results obtained from the analysis of event sample simulated (MC-RAND) by generating random numbers and also with the analysis of events generated by the UrQMD and AMPT model. Our study confirms the presence of strong short-range correlations among the produced particles in the forward and the backward pseudo-rapidity region. The analysis of the simple Monte Carlo-simulated (MC-RAND) events signifies that the observed correlations are not due to mere statistics only; explanation of such correlations can be attributed to the presence of dynamical fluctuations during the production of charged pions. Comparisons of the experimental results with the results obtained from analyzing the UrQMD data sample indicate that the UrQMD model cannot reproduce the experimental findings. The AMPT model also cannot explain the experimental results satisfactorily. Comparisons of our experimental results with the results obtained from the analysis of higher energy emulsion data and with the results of the RHIC data have also been presented.

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Section: Target Identification In Emulsion Detector and Experimental ...mentioning

confidence: 99%

Forward–backward multiplicity correlation in high-energy nucleus–nucleus interactions at a few AGeV/c

Bhattacharyya¹,

Neagu²,

Firu³

2014

J. Phys. G: Nucl. Part. Phys.

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“…Considerable work has been done on protonnucleus interactions upto 800 GeV [1][2][3][4][5][6][7][8][9][10], which is presently the highest energy for fixed targets. Most of these investigations have been carried out for all event multiplicities.…”

Section: In~oducfionmentioning

confidence: 99%

Some characteristics of high multiplicity (?45) proton-AgBr interactions at 800 GeV

Soni

Malik

Shivpuri

1994

Z. Physik A - Hadrons and Nuclei

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Abstract.Experimental results on some characteristics of high multiplicity (>45) proton-AgBr interactions at 800 GeV are presented. The results are compared with those in lower multiplicity regions as well as for CNO target. The various parameters investigated here are pseudorapidity distribution, mean normalised multiplicity, mean number of intranuclear collisions and normalised pseudorapidity. PACS: 13.85.Hd; 12.90.+b; 29.40.Rg In~oducfionThe space time development of hadron production in hadron-nucleus interaction is invaluable as it provides deeper insight into the fundamental strong interaction processes. Considerable work has been done on protonnucleus interactions upto 800 GeV [1][2][3][4][5][6][7][8][9][10], which is presently the highest energy for fixed targets. Most of these investigations have been carried out for all event multiplicities. Since in high energy interactions, majority of the collisions are peripheral, hence the thrust of the investigations so far has been on these collisions. It would be interesting to study the central collisions (high multiplicity/high momentum transfer events) and also determine if event characteristics are modified, if any, due to high momentum transfer of the collisions. With this aim in view, we study here the characteristics of interactions with multiplicity >=45 in 800 GeV proton interactions with AgBr nuclei. A parameter which reflects the mechanism of multiparticle production is the multiplicity of secondary particles. The other important feature of this parameter is that its value can be accurately determined. The present investigation is confined primarily to the studies of multiplicity, multiplicity correlations, the number of intranuclear collisions and differential multiplicity in the rarely occurring high multiplicity p-AgBr interactions at 800 GeV. ExperimentA stack of 40 Ilford G5 emulsion pellicles of dimension 10 cm • 8 cmx 0.06 cm was exposed to a proton beam of energy 800 GeV at Fermilab. The beam flux was 8.7 • 104 particles/cm 2 and the dispersion of the primary was < 0.05%. The emulsion plates were carefully area scanned for inelastic events. All events were area scanned twice by each observer and the average efficiency for detecting events was found to be 96%. Scanning was done at a distance of 1 cm from the leading edge of the emulsion, so that there was no interaction due to a secondary track. In order to select events due to primary protons the incident particle should make an angle < 2 ~ with mean beam direction. Events lying up to 25 gm from the surface or glass side of the emulsion pellicle were not considered. Using the above criteria, a total of 2317 events were obtained. Following the emulsion terminology [11] secondary particles with fl (v/e) >= 0.7 and fl < 0.7 were designated as shower and heavy tracks respectively. It was convenient to further subdivide the heavy ionising tracks into black and grey tracks, whose multiplicities were designated as Nb and Ng respectively. The black tracks resulted from secondary particles with specifi...

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Centrality dependence of total disintegration of target nuclei in high energy nucleus–nucleus interactions

2016

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A study of centrality dependence of target fragmentation and multiparticle production has been carried out in 16O–AgBr, 22Ne–AgBr, and 28Si–AgBr interactions at 4.1–4.5 AGeV/c for the total disintegrated (TD) events. Average multiplicity of black particles increases linearly with decreasing centrality while average multiplicity of grey and shower particles decreases with decreasing centrality for the TD events. The decrease of average multiplicity of grey particles is linear; on the other hand, in the case of shower particles, the increase is nonlinear. With the increase of the mass of the projectile beam, the average multiplicity of black particles decreases and the average multiplicity of grey particles increases for the TD events. This observation has been explained on the basis of the fireball model; however, in the case of shower particles, average multiplicity increases with increase of projectile mass.

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Multiplicity and multiplicity correlations in 800 GeV proton-emulsion nucleus interactions

Cited by 3 publications

References 30 publications

Forward–backward multiplicity correlation in high-energy nucleus–nucleus interactions at a few AGeV/c

Forward–backward multiplicity correlation in high-energy nucleus–nucleus interactions at a few AGeV/c

Some characteristics of high multiplicity (?45) proton-AgBr interactions at 800 GeV

Centrality dependence of total disintegration of target nuclei in high energy nucleus–nucleus interactions

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