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Title: Negative binomial fits to multiplicity distributions from central collisions of {sup 16}O + Cu at 14.6A GeV/c and intermittency

Abstract

An `intermittency` analysis of charged particle multiplicity data from the target multiplicy array (TMA) in central collisions of {sup 16}O+Cu at 14.6 A{times}GeV/c has been published by the AGS-E802 collaboration. The centrality cut was made using the Zero degree Calorimeter and requiring that the forward energy be less than one projectile nucleon (i.e. T{sub ZCAL} <13.6 GeV). In agreement with previous measurements, an apparent power-law growth of Normalized Factorial moments with decreasing pseudorapidity interval was observed in the range 1.0{ge}{delta}{eta}{ge}0.1. In the present work, multiplicity distributions in individual pseudorapidity bins are presented for the same data. These distributions are excellently fit by Negative Binomial Distributions (NBD) in all {delta}{eta} bins, allowing, for the first time, a systematic formulation of the subject of `intermittency` in terms of distributions, rather than moments. In agreement with all previous measurements of NBD fits to multiplicity distributions in hadron and lepton reactions, the k parameter of the NBD fit for central {sup 16}O+Cu collisions is found to exhibit an apparently linear increase with the {delta}{eta} interval, albeit with a much steeper slope than for the other reactions, and a non-zero intercept, k(0){ne}0. True intermittency, {xi}{yields}0, would occur if the intercept k(0){yields}0, which is not observedmore » in any experiment. The correlation length for central {sup 16}O+Cu collisions, although smaller than expected, is quite finite and can be measured - which means that a length scale exists in these collisions and therefore there is no intermittency in the multiplicity fluctuations.« less

Authors:
Publication Date:
Research Org.:
Brookhaven National Lab., Upton, NY (United States); Argonne National Lab., IL (United States); Columbia Univ., New York, NY (United States). Dept. of Physics; Lawrence Livermore National Lab., CA (United States); Massachusetts Inst. of Tech., Cambridge, MA (United States); California Univ., Riverside, CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States); Argonne National Lab., IL (United States); Columbia Univ., New York, NY (United States); Lawrence Livermore National Lab., CA (United States); Massachusetts Inst. of Tech., Cambridge, MA (United States); California Univ., Berkeley, CA (United States); National Aeronautics and Space Administration, Washington, DC (United States); US-Japan High Energy Physics Collaboration
OSTI Identifier:
10108142
Report Number(s):
BNL-61074; CONF-9406274-4
ON: DE95004835; CNN: Grant NGR-05-003-513; TRN: 95:001024
DOE Contract Number:  
AC02-76CH00016; W-31109-ENG-38; FG02-86ER40281; W-7405-ENG-48; AC02-76ER03069; FG03-86ER40271
Resource Type:
Conference
Resource Relation:
Conference: NATO Advanced Research workshop on hot hadronic matter: theory and experiment,Divonne-les-Bains (France),27 Jun - 1 Jul 1994; Other Information: PBD: 14 Oct 1994
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; COPPER; OXYGEN 16 REACTIONS; MULTIPLICITY; TARGETS; PARTICLE RAPIDITY; FLUCTUATIONS; 663450; 663540; HEAVY-ION-INDUCED REACTIONS AND SCATTERING; A = 39-58

Citation Formats

Tannenbaum, M J. Negative binomial fits to multiplicity distributions from central collisions of {sup 16}O + Cu at 14.6A GeV/c and intermittency. United States: N. p., 1994. Web.
Tannenbaum, M J. Negative binomial fits to multiplicity distributions from central collisions of {sup 16}O + Cu at 14.6A GeV/c and intermittency. United States.
Tannenbaum, M J. 1994. "Negative binomial fits to multiplicity distributions from central collisions of {sup 16}O + Cu at 14.6A GeV/c and intermittency". United States. https://www.osti.gov/servlets/purl/10108142.
@article{osti_10108142,
title = {Negative binomial fits to multiplicity distributions from central collisions of {sup 16}O + Cu at 14.6A GeV/c and intermittency},
author = {Tannenbaum, M J},
abstractNote = {An `intermittency` analysis of charged particle multiplicity data from the target multiplicy array (TMA) in central collisions of {sup 16}O+Cu at 14.6 A{times}GeV/c has been published by the AGS-E802 collaboration. The centrality cut was made using the Zero degree Calorimeter and requiring that the forward energy be less than one projectile nucleon (i.e. T{sub ZCAL} <13.6 GeV). In agreement with previous measurements, an apparent power-law growth of Normalized Factorial moments with decreasing pseudorapidity interval was observed in the range 1.0{ge}{delta}{eta}{ge}0.1. In the present work, multiplicity distributions in individual pseudorapidity bins are presented for the same data. These distributions are excellently fit by Negative Binomial Distributions (NBD) in all {delta}{eta} bins, allowing, for the first time, a systematic formulation of the subject of `intermittency` in terms of distributions, rather than moments. In agreement with all previous measurements of NBD fits to multiplicity distributions in hadron and lepton reactions, the k parameter of the NBD fit for central {sup 16}O+Cu collisions is found to exhibit an apparently linear increase with the {delta}{eta} interval, albeit with a much steeper slope than for the other reactions, and a non-zero intercept, k(0){ne}0. True intermittency, {xi}{yields}0, would occur if the intercept k(0){yields}0, which is not observed in any experiment. The correlation length for central {sup 16}O+Cu collisions, although smaller than expected, is quite finite and can be measured - which means that a length scale exists in these collisions and therefore there is no intermittency in the multiplicity fluctuations.},
doi = {},
url = {https://www.osti.gov/biblio/10108142}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Oct 14 00:00:00 EDT 1994},
month = {Fri Oct 14 00:00:00 EDT 1994}
}

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