CALORIMETRY FOR GLOBAL MEASUREMENTS IN PHENIX.

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The charged particle multiplicity, dN{sub ch}/d{eta}, and transverse energy, E{sub t}, are fundamental aspects of Heavy Ion collisions which PHENIX has measured in Au-Au collisions at a center-of-mass (c.m.s.) energy {radical}s{sub N}N = 130 GeV. E{sub t} is a multiparticle global observable related, through the Bjorken relation, to the maximum energy density achieved in the collision. For a given c.m.s. energy, the multiplicity and transverse energy are expected to increase with the number of nucleons participating in a collision (n{sub part}). The dependence on n{sub part} is found to be (dE{sub t}/d{eta}, dN{sub ch}/d{eta}) {approx} n{sub part}{sup {alpha}}, where {alpha} ... continued below

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WHITE,S.N. FOR PHENIX COLLABORATION January 15, 2001.

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The charged particle multiplicity, dN{sub ch}/d{eta}, and transverse energy, E{sub t}, are fundamental aspects of Heavy Ion collisions which PHENIX has measured in Au-Au collisions at a center-of-mass (c.m.s.) energy {radical}s{sub N}N = 130 GeV. E{sub t} is a multiparticle global observable related, through the Bjorken relation, to the maximum energy density achieved in the collision. For a given c.m.s. energy, the multiplicity and transverse energy are expected to increase with the number of nucleons participating in a collision (n{sub part}). The dependence on n{sub part} is found to be (dE{sub t}/d{eta}, dN{sub ch}/d{eta}) {approx} n{sub part}{sup {alpha}}, where {alpha} is larger than unity. This rapid growth (i.e. more rapid than linear) is not surprising in the collision of large nuclei since an individual participant nucleon may undergo more than one collision. The variable n{sub collision} is also introduced to denote the number of binary collisions. Whereas n{sub part} can be directly measured, in principle, directly from the number of non-participating nucleons detected in the forward direction, n{sub collision} is not observable but can be calculated statistically from n{sub part}, using the Glauber model.

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4 pages

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  • QUARK MATTER 2001 INTERNATIONAL CONFERENCE ON ULTRA RELATIVISTIC NUCLEUS NUCLEUS COLLISIONS, STONYBROOK, NY (US), 01/15/2001--01/20/2001

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  • Report No.: BNL--69030
  • Grant Number: AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 793391
  • Archival Resource Key: ark:/67531/metadc737213

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  • January 15, 2001

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  • Oct. 19, 2015, 7:39 p.m.

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  • Nov. 6, 2015, 11:03 p.m.

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WHITE,S.N. FOR PHENIX COLLABORATION. CALORIMETRY FOR GLOBAL MEASUREMENTS IN PHENIX., article, January 15, 2001; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc737213/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.