Centrality and transverse momentum dependence of collective flow in 158 A GeV Pb+Pb collisions measured via inclusive photons

Summary, in English

Directed and elliptic flow of inclusive photons near mid-rapidity in 158 A GeV Pb + Pb collisions has been studied. The data have been obtained with the photon spectrometer LEDA of the WA98 experiment at the CERN SPS. The flow strength has been measured for various centralities as a function of p(T) and rapidity over 0. 18 < p(T) < 1.5 GeV/c and 2.3 < y < 2.9. The angular anisotropy has been studied relative to an event plane obtained in the target fragmentation region that shows the elliptic flow to be in-plane. The elliptic flow has also been studied using two-particle correlations and shown to give similar results. A small directed flow component is observed. Both the directed and elliptic flow strengths increase with p(T). The photon flow results are used to estimate the corresponding neutral pion flow.

• Author: MM Aggarwal; Z Ahammed; ALS Angelis; V Antonenko; V Arefiev; V Astakhov; V Avdeitchikov; TC Awes; PVKS Baba; SK Badyal; S Bathe; B Batiounia; T Bernier; VS Bhatia; C Blume; D Bucher; H Busching; Lars Carlén; S Chattopadhyay; MP Decowski; H Delagrange; P Donni; MRD Majumdar; AK Dubey; K El Chenawi; K Enosawa; S Fokin; V Frolov; MS Ganti; Sten Garpman; O Gavrishchuk; FJM Geurts; TK Ghosh; R Glasow; B Guskov; Hans-Åke Gustafsson; HH Gutbrod; I Hrivnacova; M Ippolitov; H Kalechofsky; R Kamermans; K Karadjev; K Karpio; BW Kolb; I Kosarev; I Koutcheryaev; A Kugler; P Kulinich; M Kurata; A Lebedev; H Lohner; L Luquin; DP Mahapatra; V Manko; M Martin; G Martinez; A Maximov; Y Miake; GC Mishra; B Mohanty; MJ Mora; D Morrison; T Mukhanova; DS Mukhopadhyay; H Naef; BK Nandi; SK Nayak; TK Nayak; A Nianine; V Nikitine; S Nikolaev; Pål Nilsson; S Nishimura; P Nomokonov; Joakim Nystrand; Anders Oskarsson; Ingvar Otterlund; T Peitzmann; D Peressounko; V Petracek; SC Phatak; W Pinganaud; F Plasil; ML Purschke; J Rak; R Raniwala; S Raniwala; NK Rao; F Retiere; K Reygers; G Roland; L Rosselet; I Roufanov; C Roy; JM Rubio; SS Sambyal; R Santo; S Sato; H Schlagheck; HR Schmidt; Y Schutz; G Shabratova; TH Shah; I Sibiriak; T Siemiarczuk; David Silvermyr; BC Sinha; N Slavine; Kaj Söderström; G Sood; SP Sorensen; P Stankus; G Stefanek; P Steinberg; Evert Stenlund; M Sumbera; T Svensson; A Tsvetkov; L Tykarski; ECVD Pijll; NV Eijndhoven; GJV Nieuwenhuizen; A Vinogradov; YP Viyogi; A Vodopianov; S Voros; B Wyslouch; GR Young
• Department/s: Department of Physics; Particle and nuclear physics
• Publishing year: 2005
• Language: English
• Pages: 129-146
• Publication/Series: Nuclear Physics, Section A
• Volume: 762
• Issue: 1-2
• Links: http://dx.doi.org/10.1016/j.nuclphysa.2005.08.004
• Document type: Journal article
• Publisher: Elsevier
• Topic: Subatomic Physics
• Keywords: measured; nuclear reactions Pb-208(Pb-208; E=158 GeV/nucleon; inclusive photons direct and elliptic flow vs. centrality; X); deduced neutral pion flow features; transverse momentum; rapidity and
• Status: Published
• ISBN/ISSN/Other: ISSN: 0375-9474