Expansion dynamics of Pb–Pb collisions at 40 A GeV/c viewed by negatively charged hadrons

F Antinori,P Bacon,A Badala,R Barbera,A Belogianni,I J Bloodworth,M Bombara,G E Bruno,S A Bull,R Caliandro,M Campbell,W Carena,N Carrer,R F Clarke,A Dainese,S Di Liberto,R Divia,D Elia,D Evans,G A Feofilov,R A Fini,P Ganoti,B Ghidini,H Helstrup,K F Hetland,A K Holme,A Jacholkowski,G T Jones,P Jovanovic,A Jusko,R Kamermans,J B Kinson,K Knudson,V Kondratiev,I Kralik,P Kuijer,V Lenti,R Lietava,V Manzari,M A Mazzoni,F Meddi,A Michalon,M Morando,P I Norman,A Palmeri,G S Pappalardo,R J Platt,E Quercigh,F Riggi,D Rohrich,G Romano,R Romita,K ÿSafaÿr ´ õk,E Schillings,G Segato,M Sene,R Sene,W Snoeys,F Soramel,M Spyropoulou-Stassinaki,P Staroba,R Turrisi,T S Tveter,J Urban,P van de Ven,P Vande Vyvre,A Vascotto,T Vik,O Villalobos Baillie,L Vinogradov,M F Votruba,J Vrlakova,P Zavada, A Vascotto,T Vik,O Villalobos Baillie,L Vinogradov,T Virgili,M F Votruba,J Vrláková,P Závada

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS（2007）

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Abstract

In this paper, we present results on transverse mass spectra and Hanbury Brown and Twiss correlation functions of negatively charged hadrons, which are expected to be mostly pi(-), measured in Pb-Pb collisions at 40 A GeV/c beam momentum. Based on these data, the collision dynamics and the spacetime Kextent of the system at the thermal freeze-out are studied over a centrality range corresponding to the most central 53% of the Pb-Pb inelastic crosssection. Comparisons with freeze-out conditions of strange particles and HBT results from other experiments are discussed.

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Key words

pb–pb collisions

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