Authors

Abbott, T
Ahle, L
Akiba, Y
Alburger, D
Beavis, D
Birstein, L
Bloomer, MA
Bond, PD
Britt, HC
Budick, B
Chasman, C
Chen, Z
Chi, CY
Chu, YY
Cianciolo, V
Cole, BA
Costales, JB
Crawford, HJ
Cumming, JB
Debbe, R
Duek, E
Engelage, J
Fung, SY
Gonin, M
Grodzins, L
Gushue, S
Hamagaki, H
Hansen, O
Hayano, RS
Hayashi, S
Homma, S
Huang, HZ
Ikeda, Y
Juricic, I
Kaneko, H
Kang, J
Katcoff, S
Kaufman, S
Kehoe, WL
Kimura, K
Kitamura, K
Kurita, K
Ledoux, RJ
LeVine, MJ
Miake, Y
Morrison, DP
Morse, RJ
Moskowitz, B
Nagamiya, S
Namboodiri, MN
Nayak, TK
Olness, J
Parsons, CG
Remsberg, LP
Rothschild, P
Sakurai, H
Sangster, TC
Sarabura, M
Seto, R
Shigaki, K
Shor, A
Soltz, R
Stankus, P
Steadman, SG
Stephans, GSF
Sugitate, T
Sung, T
Tanaka, M
Tannenbaum, MJ
Thomas, J
Tonse, S
Torikoshi, M
Ueno-Hayashi, S
van Dijk, JH
Videbaek, F
Vient, M
Vincent, P
Vossnack, O
Vulgaris, E
Vutsadakis, V
Wang, FQ
Wang, Y
Watson, WA
Wegner, HE
Woodruff, DS
Wu, YD
Yagi, K
Yang, X
Zachary, D
Zajc, WA

Citation

T. Abbott et al., Systematics of midrapidity transverse energy distributions in limited apertures from p+Be to Au+Au collisions at relativistic energies - art. no. 064602, PHYS REV C, 6306(6), 2001, pp. 4602

Citations number

98

Language

INGLESE

art.tipo

Article

Categorie Soggetti

Physics

Journal title

PHYSICAL REVIEW C

ISSN journal

0556-2813
→ ACNP

Volume

6306

Issue

6

Year of publication

2001

Database

ISI

SICI code

0556-2813(200106)6306:6<4602:SOMTED>2.0.ZU;2-P

Abstract

Measurements of the A dependence and pseudorapidity interval (delta eta) de
pendence of midrapidity E-T distributions in a half-azimuth (Delta phi = pi
) electromagnetic calorimeter are presented for p + Be, p + Au, O + Cu, Si
+ Au, and Au + Au collisions at the BNL-AGS (Alternating-Gradient Synchrotr
on). The shapes of the upper edges of midrapidity E-T distributions as a fu
nction of the pseudorapidity interval delta eta in the range 0.3 to 1.3, ro
ughly centered at midrapidity, are observed to vary with delta eta. like mu
ltiplicity-the upper edges of the distributions flatten as delta eta is red
uced. At the typical fixed upper percentiles of E-T distributions used for
nuclear geometry characterization by centrality definition-7 percentile, 4
percentile, 2 percentile, I percentile, 0.5 percentile-the effect of this v
ariation in shape on the measured projectile A(p) dependence for O-16, Si-2
8, Au-197 projectiles on an Au target is small for the ranges of delta eta
and percentile examined. The E-T distributions for p + Au and p + Be change
in shape with delta eta; but in each delta eta interval the shapes of the
p + Au and p + Be distributions remain indentical with each other-a strikin
g confirmation of the absence of multiple-collision effects at midrapidity
at AGS energies. The validity of the nuclear geometry characterization vers
us delta eta is illustrated by plots of the E-T(delta eta) distribution in
each delta eta interval in units of the measured <E-T(delta eta)> (p + Au)
same delta eta interval for p + Au collisions. These plots, in the physical
ly meaningful units of "number of average p + Au collisions," are nearly un
iversal as a function of delta eta confirming that the reaction dynamics fo
r E-T production at midrapidity at AGS energies is governed by the number o
f projectile participants and can be well characterized by measurements in
apertures as small as Delta phi = pi, delta eta = 0.3.