Negative binomial fits to multiplicity distributions from central collisions of {sup 16}O + Cu at 14.6A GeV/c and intermittency
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.
- Research Organization:
- 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 Organization:
- 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
- DOE Contract Number:
- AC02-76CH00016; W-31109-ENG-38; FG02-86ER40281; W-7405-ENG-48; AC02-76ER03069; FG03-86ER40271
- OSTI ID:
- 10108142
- Report Number(s):
- BNL-61074; CONF-9406274-4; ON: DE95004835; CNN: Grant NGR-05-003-513; TRN: 95:001024
- 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
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Negative binomial fits to multiplicity distributions in restricted {delta}{eta} intervals from central O+Cu collisions at 14.6A GeV/c and their implication for ``Intermittency``
Negative binomial distribution fits to multiplicity distributions in restricted {delta}{eta} intervals from central {sup 16}O + Cu collisions at 14.6A GeV/c and their implication for ``intermittency``