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

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• 作者：WA98 Collaboration ; M.M. Aggarwal^a ; Z. Ahammed^b ; A.L.S. Angelis^c ; ¹ ; V. Antonenko^d ; V. Arefiev^e ; V. Astakhov^e ; V. Avdeitchikov^e ; T.C. Awes^f ; P.V.K.S. Baba^g ; S.K. Badyal^g ; S. Bathe^h ; B. Batiounia^e ; T. Bernierⁱ ; K.B. Bhalla^j ; V.S. Bhatia^a ; C. Blume^h ; D. Bucher^h ; H. Bü ; sching^h ; L. Carlen^k ; S. Chattopadhyay^b ; M.P. Decowski^l ; H. Delagrangeⁱ ; P. Donni^c ; M.R. Dutta Majumdar^b ; K. El Chenawi^k ; A.K. Dubey^b ; K. Enosawaⁿ ; S. Fokin^d ; V. Frolov^e ; M.S. Ganti^b ; S. Garpman^k ; ¹ ; O. Gavrishchuk^e ; F.J.M. Geurts^o ; T.K. Ghosh^b ; R. Glasow^h ; R. Gupta^g ; B. Guskov^e ; H.Å ; . Gustafsson^k ; ¹ ; H.H. Gutbrod^q ; I. Hrivnacova^r ; M. Ippolitov^d ; H. Kalechofsky^c ; R. Kamermans^o ; K. Karadjev^d ; K. Karpio^s ; B.W. Kolb^q ; I. Kosarev^e ; I. Koutcheryaev^d ; A. Kugler^r ; P. Kulinich^l ; M. Kurataⁿ ; A. Lebedev^d ; H. Liu^s ; H. Lö ; hner^p ; L. Luquinⁱ ; D.P. Mahapatra^m ; V. Manko^d ; M. Martin^c ; G. Martí ; nezⁱ ; A. Maximov^e ; Y. Miakeⁿ ; G.C. Mishra^m ; B. Mohanty^b ; M.-J. Moraⁱ ; D. Morrison^t ; T. Moukhanova^d ; D.S. Mukhopadhyay^b ; H. Naef^c ; B.K. Nandi^m ; S.K. Nayak^g ; T.K. Nayak^b ; A. Nianine^d ; V. Nikitine^e ; S. Nikolaev^d ; P. Nilsson^k ; S. Nishimuraⁿ ; P. Nomokonov^e ; J. Nystrand^k ; A. Oskarsson^k ; I. Otterlund^k ; S. Pavliouk^d ; T. Peitzmann^o ; D. Peressounko^d ; V. Petracek^r ; W. Pinanaudⁱ ; F. Plasil^f ; M.L. Purschke^q ; J. Rak^r ; R. Raniwala^j ; S. Raniwala^j ; N.K. Rao^g ; F. Retiereⁱ ; K. Reygers^h ; G. Roland^l ; L. Rosselet^c ; I. Roufanov^e ; C. Royⁱ ; J.M. Rubio^c ; S.S. Sambyal^g ; R. Santo^h ; S. Satoⁿ ; H. Schlagheck^h ; H.-R. Schmidt^q ; Y. Schutzⁱ ; G. Shabratova^e ; T.H. Shah^g ; I. Sibiriak^d ; T. Siemiarczuk^s ; D. Silvermyr^k ; B.C. Sinha^b ; N. Slavine^e ; K. Sö ; derströ ; m^k ; G. Sood^a ; S.P. Sø ; rensen^t ; P. Stankus^f ; G. Stefanek^s ; P. Steinberg^l ; E. Stenlund^k ; M. Sumbera^r ; T. Svensson^k ; A. Tsvetkov^d ; L. Tykarski^s ; E.C.v.d. Pijll^o ; N.v. Eijndhoven^o ; G.J.v. Nieuwenhuizen^l ; A. Vinogradov^d ; Y.P. Viyogi^b ; ^{viyogi@vecc.gov.in"" rel=""nofollow} ; A. Vodopianov^e ; S. Vö ; rö ; s^c ; B. Wysł ; ouch^l ; G.R. Young^f
• 关键词：The WA98 experiment ; Photon multiplicity detector ; Disoriented chiral condensate ; Silicon pad multiplicity detector ; Sliding window method ; Charged– ; neutral fluctuations
• 刊名：Physics Letters B
• 出版年：2011
• 出版时间：11 July 2011
• 年：2011
• 卷：701
• 期：3
• 页码：300-305
• 全文大小：328 K

文摘

Charged particles and photons have been measured in central Pb + Pb collisions at 158 A GeV in a common (η–)-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–Δ region.