Systematics of Inclusive Photon Production in 158 AGeV Pb Induced
  Reactions on Ni, Nb, and Pb Targets

Aggarwal, M M; Agnihotri, A; Ahammed, Z; Angelis, Aris L S; Antonenko, V G; Arefev, V; Astakhov, V A; Avdeichikov, V; Awes, T C; Baba, P V K S; Badyal, S K; Baldin, A; Barabash, L; Barlag, C; Bathe, S; Batyunya, B; Bernier, T; Bhalla, K B; Bhatia, V S; Blume, C; Bohne, E M; Bucher, D; Buijs, A; Böck, R K; Böröcz, Z K; Büsching, H; Carlén, L; Chalyshev, V; Chattopadhyay, S; Cherbachev, R; Chujo, T; Claussen, A; Das, A C; Decowski, M P; Dubovik, I; Dutt, S K; Dutta-Majumdar, M R; Dzhordzhadze, V; Dönni, P; El-Chenawi, K F; Eliseev, S; Enosawa, K; Foka, P Y; Fokin, S L; Frolov, V; Ganti, M S; Garpman, S I A; Gavrishchuk, O P; Geurts, F J M; Ghosh, T K; Glasow, R; Guskov, B; Gustafsson, Hans Åke; Gutbrod, H H; Higuchi, R; Hrivnacova, I; Ippolitov, M S; Kalechofsky, H; Kamermans, R; Kampert, K H; Karadzhev, K; Karpio, K; Kato, S; Kees, S; Kim, H; Kolb, B W; Kosarev, I G; Krümpel, T; Kucheryaev, I; Kugler, A; Kulinich, P A; Kurata, M; Kurita, K; Kuzmin, N A; Langbein, I; Lebedev, A; Lee, Y Y; Luquin, Lionel; Löhner, H; Mahapatra, D P; Maksimov, A; Man'ko, V I; Martin, M; Mehdiyev, R; Mgebrishvili, G; Miake, Y; Mikhalev, D; Mir, M F; Mishra, G C; Miyamoto, Y; Morrison, D; Mukhopadhyay, D S; Myalkovskii, V; Naef, H; Nandi, B K; Nayak, S K; Nayak, T K; Neumaier, S; Nikitin, V A; Nikolaev, S; Nilsson, P O; Nishimura, S; Nomokonov, V P; Nyanin, A; Nystrand, J; Obenshain, F E; Oskarsson, A; Otterlund, I; Pachr, M; Parfenov, A; Pavlyuk, S; Peitzmann, Thomas; Petracek, V; Pinanaud, W; Plasil, F; Purschke, M L; Rak, J; Ramamurthy, V S; Raniwala, R; Raniwala, S; Rao, N K; Retière, F; Reygers, K; Roland, G; Rosselet, L; Roy, C; Rubio, J M; Rufanov, I A; Räven, B; Sako, H; Sambyal, S S; Santo, R; Sato, S; Schlagheck, H; Schmidt, H R; Sen-Gupta, S K; Shabratova, G; Shah, T H; Sibiryak, Yu; Siemiarczuk, T; Silvermyr, D; Sinha, B C; Slavin, N V; Solomey, Nickolas; Stankus, P; Stefanek, G; Steinberg, P; Stenlund, E; Stüken, D; Sumbera, M; Svensson, T; Söderström, K; Sørensen, S P; Trivedi, M D; Tsvetkov, A A; Twenhöfel, C; Tykarski, L; Urbahn, J; van Eijndhoven, N; van Nieuwenhuizen, G J; Vinogradov, A; Viyogi, Y P; Vodopyanov, A S; Vörös, S; Wyslouch, B; Yagi, K; Yokota, Y; Young, G R

research

Systematics of Inclusive Photon Production in 158 AGeV Pb Induced Reactions on Ni, Nb, and Pb Targets

Authors: M M Aggarwal
A Agnihotri
Z Ahammed
Aris L S Angelis
V G Antonenko
V Arefev
V A Astakhov
V Avdeichikov
T C Awes
P V K S Baba
S K Badyal
A Baldin
L Barabash
C Barlag
S Bathe
B Batyunya
T Bernier
K B Bhalla
V S Bhatia
C Blume
E M Bohne
D Bucher
A Buijs
R K Böck
Z K Böröcz
H Büsching
L Carlén
V Chalyshev
S Chattopadhyay
R Cherbachev
T Chujo
A Claussen
A C Das
M P Decowski
I Dubovik
S K Dutt
M R Dutta-Majumdar
V Dzhordzhadze
P Dönni
K F El-Chenawi
S Eliseev
K Enosawa
P Y Foka
S L Fokin
V Frolov
M S Ganti
S I A Garpman
O P Gavrishchuk
F J M Geurts
T K Ghosh
R Glasow
B Guskov
Hans Åke Gustafsson
H H Gutbrod
R Higuchi
I Hrivnacova
M S Ippolitov
H Kalechofsky
R Kamermans
K H Kampert
K Karadzhev
K Karpio
S Kato
S Kees
H Kim
B W Kolb
I G Kosarev
T Krümpel
I Kucheryaev
A Kugler
P A Kulinich
M Kurata
K Kurita
N A Kuzmin
I Langbein
A Lebedev
Y Y Lee
Lionel Luquin
H Löhner
D P Mahapatra
A Maksimov
V I Man'ko
M Martin
R Mehdiyev
G Mgebrishvili
Y Miake
D Mikhalev
M F Mir
G C Mishra
Y Miyamoto
D Morrison
D S Mukhopadhyay
V Myalkovskii
H Naef
B K Nandi
S K Nayak
T K Nayak
S Neumaier
V A Nikitin
S Nikolaev
P O Nilsson
S Nishimura
V P Nomokonov
A Nyanin
J Nystrand
F E Obenshain
A Oskarsson
I Otterlund
M Pachr
A Parfenov
S Pavlyuk
Thomas Peitzmann
V Petracek
W Pinanaud
F Plasil
M L Purschke
J Rak
V S Ramamurthy
R Raniwala
S Raniwala
N K Rao
F Retière
K Reygers
G Roland
L Rosselet
C Roy
J M Rubio
I A Rufanov
B Räven
H Sako
S S Sambyal
R Santo
S Sato
H Schlagheck
H R Schmidt
S K Sen-Gupta
G Shabratova
T H Shah
Yu Sibiryak
T Siemiarczuk
D Silvermyr
B C Sinha
N V Slavin
Nickolas Solomey
P Stankus
G Stefanek
P Steinberg
E Stenlund
D Stüken
M Sumbera
T Svensson
K Söderström
S P Sørensen
M D Trivedi
A A Tsvetkov
C Twenhöfel
L Tykarski
J Urbahn
N van Eijndhoven
G J van Nieuwenhuizen
A Vinogradov
Y P Viyogi
A S Vodopyanov
S Vörös
B Wyslouch
K Yagi
Y Yokota
G R Young
Publication date: 1 January 1999
Publisher: 'Elsevier BV'
Doi

Abstract

The multiplicity of inclusive photons has been measured on an event-by-event basis for 158 AGeV Pb induced reactions on Ni, Nb, and Pb targets. The systematics of the pseudorapidity densities at midrapidity (rho_max) and the width of the pseudorapidity distributions have been studied for varying centralities for these collisions. A power law fit to the photon yield as a function of the number of participating nucleons gives a value of 1.13+-0.03 for the exponent. The mean transverse momentum, , of photons determined from the ratio of the measured electromagnetic transverse energy and photon multiplicity, remains almost constant with increasing rho_max. Results are compared with model predictions.Comment: 16 pages including 4 figure