Further observations on midrapidity [Formula Presented] distributions with aperture corrected scale

T. Abbott, L. Ahle, Y. Akiba, D. Alburger, D. Beavis, L. Birstein, M. A. Bloomer, P. D. Bond, H. C. Britt, B. Budick, C. Chasman, Z. Chen, C. Y. Chi, Y. Y. Chu, V. Cianciolo, B. A. Cole, J. B. Costales, H. J. Crawford, J. B. Cumming, R. DebbeE. Duek, J. Engelage, S. Y. Fung, M. Gonin, L. Grodzins, S. Gushue, H. Hamagaki, O. Hansen, R. S. Hayano, S. Hayashi, S. Homma, H. Z. Huang, Y. Ikeda, I. Juricic, H. Kaneko, J. Kang, S. Katcoff, S. Kaufman, W. L. Kehoe, K. Kimura, K. Kitamura, K. Kurita, R. J. Ledoux, M. J. LeVine, Y. Miake, D. P. Morrison, R. J. Morse, B. Moskowitz, S. Nagamiya, M. N. Namboodiri, T. K. Nayak, J. Olness, C. G. Parsons, L. P. Remsberg, P. Rothschild, H. Sakurai, T. C. Sangster, M. Sarabura, R. Seto, K. Shigaki, A. Shor, R. Soltz, P. Stankus, S. G. Steadman, G. S.F. Stephans, T. Sugitate, T. Sung, M. Tanaka, M. J. Tannenbaum, J. Thomas, S. Tonse, M. Torikoshi, S. Ueno-Hayashi, J. H. van Dijk, F. Videbæk, M. Vient, P. Vincent, O. Vossnack, E. Vulgaris, V. Vutsadakis, F. Q. Wang, Y. Wang, W. A. Watson, H. E. Wegner, D. S. Woodruff, Y. D. Wu, K. Yagi, X. Yang, D. Zachary, W. A. Zajc

Research output: Contribution to journalArticlepeer-review


In a previous publication [T. Abbott et al., E802 Collaboration, Phys. Rev. C 63, 064602 (2001); 64, 029901(E) (2001)], measurements of the A dependence and pseudorapidity interval [Formula Presented] dependence of midrapidity [Formula Presented] distributions in a half-azimuth [Formula Presented] electromagnetic calorimeter were presented for [Formula Presented] [Formula Presented] O+Cu, Si+Au, and Au+Au collisions at the BNL-AGS. The validity of the “nuclear geometry” characterization versus [Formula Presented] was illustrated by plots of the [Formula Presented] distribution in each [Formula Presented] interval in units of the measured [Formula Presented] in the same [Formula Presented] interval for [Formula Presented] collisions. These plots, with aperture corrected scale in the physically meaningful units of number of average observed [Formula Presented] collisions, were nearly universal as a function of [Formula Presented] confirming that the reaction dynamics for [Formula Presented] production at midrapidity at AGS energies is governed by the number of projectile participants and can be well characterized by measurements in apertures as small as [Formula Presented] A key ingredient in these analyses is the probability [Formula Presented] for no signal to be detected in a given aperture [Formula Presented] for the fundamental [Formula Presented] collision. In fact the measured [Formula Presented] is biased and the true [Formula Presented] for the detector aperture is the measured value times [Formula Presented] The issues and merits of measuring the [Formula Presented] distribution in units of [Formula Presented] or [Formula Presented] in the same [Formula Presented] interval are presented and discussed. This method has application at RHIC, where p-[Formula Presented] data could be used as the reference distribution for two participants. The [Formula Presented] distributions for [Formula Presented] collisions, with [Formula Presented] scale normalized by [Formula Presented] in the same aperture for [Formula Presented] collisions, would then be given directly in the popular unit “per participant-pair” [K. Adcox et al., PHENIX Collaboration, Phys. Rev. Lett. 86, 3500 (2001); I. G. Bearden et al., BRAHMS Collaboration, Phys. Lett. B523, 227 (2001); B. B. Back et al., PHOBOS Collaboration, Phys. Rev. C 65, 031901(R) (2002); C. Adler et al., STAR Collaboration, Phys. Rev. Lett. 89, 202301 (2002)].

Original languageEnglish
JournalPhysical Review C - Nuclear Physics
Issue number3
Publication statusPublished - 2003

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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