Event-by-event charged–neutral fluctuations in Pb+Pb collisions at 158 A GeV

Charged particles and photons have been measured in central Pb+Pb collisions at 158 A GeV in a common (η–ϕ)-phase space region in the WA98 experiment at the CERN SPS. The measured distributions have been analyzed to quantify the frequency with which phase space regions of varying sizes have either s...

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Veröffentlicht in:	Physics letters. B 2011-07, Vol.701 (3), p.300-305
Hauptverfasser:	Aggarwal, M.M., Ahammed, Z., Antonenko, V., Arefiev, V., Astakhov, V., Avdeitchikov, V., Awes, T.C., Baba, P.V.K.S., Badyal, S.K., Bathe, S., Batiounia, B., Blume, C., Bucher, D., Carlen, L., Decowski, M.P., Delagrange, H., El Chenawi, K., Dubey, A.K., Enosawa, K., Frolov, V., Ganti, M.S., Garpman, S., Gavrishchuk, O., Geurts, F.J.M., Glasow, R., Gupta, R., Gustafsson, H.Å., Gutbrod, H.H., Hrivnacova, I., Ippolitov, M., Kalechofsky, H., Kamermans, R., Karpio, K., Kolb, B.W., Kosarev, I., Kugler, A., Kulinich, P., Kurata, M., Lebedev, A., Löhner, H., Luquin, L., Mahapatra, D.P., Manko, V., Martin, M., Martínez, G., Maximov, A., Mishra, G.C., Mohanty, B., Mora, M.-J., Morrison, D., Mukhopadhyay, D.S., Nandi, B.K., Nayak, S.K., Nayak, T.K., Nianine, A., Nikitine, V., Nikolaev, S., Nilsson, P., Nishimura, S., Nomokonov, P., Nystrand, J., Oskarsson, A., Otterlund, I., Pavliouk, S., Peitzmann, T., Petracek, V., Pinanaud, W., Plasil, F., Purschke, M.L., Rao, N.K., Retiere, F., Reygers, K., Rubio, J.M., Sambyal, S.S., Santo, R., Sato, S., Schmidt, H.-R., Schutz, Y., Shabratova, G., Shah, T.H., Sibiriak, I., Siemiarczuk, T., Silvermyr, D., Sinha, B.C., Slavine, N., Söderström, K., Sørensen, S.P., Stankus, P., Stefanek, G., Steinberg, P., Stenlund, E., Sumbera, M., Tykarski, L., Pijll, E.C.v.d., Eijndhoven, N.v., Viyogi, Y.P., Vodopianov, A., Vörös, S., Wysłouch, B., Young, G.R.
Format:	Artikel
Sprache:	eng
Schlagworte:	CERN CHARGED PARTICLES Charged–neutral fluctuations Collisions Computer simulation Disoriented chiral condensate Elementary particles Exact sciences and technology Fluctuation FLUCTUATIONS Lead (metal) Mathematical models Nuclear physics PHASE SPACE Photon multiplicity detector PHOTONS Physics PHYSICS OF ELEMENTARY PARTICLES AND FIELDS PIONS Silicon pad multiplicity detector Sliding window method The physics of elementary particles and fields The WA98 experiment Venus
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Zusammenfassung:	Charged particles and photons have been measured in central Pb+Pb collisions at 158 A GeV in a common (η–ϕ)-phase space region in the WA98 experiment at the CERN SPS. The measured distributions have been analyzed to quantify the frequency with which phase space regions of varying sizes have either small or large neutral pion fraction. The measured results are compared with VENUS model simulated events and with mixed events. Events with both large and small charged–neutral fluctuations are observed to occur more frequently than expected statistically, as deduced from mixed events, or as predicted by model simulations, with the difference becoming more prominent with decreasing size of the Δη–Δϕ region.
ISSN:	0370-2693 1873-2445
DOI:	10.1016/j.physletb.2011.06.003