Neutral pion number fluctuations at high multiplicity in pp-interactions at 50 GeV

A G Afonin,A N Aleev,E N Ardashev,V V Avdeichikov,V P Balandin,S G Basiladze, M Batouritski,S F Berezhnev,G A Bogdanova,Yu T Borzunov,V A Budilov,Yu A Chentsov,V Golovkin,S N Golovnya,S A Gorokhov,N Grishin,Y V Grishkevich,G G Ermakov,P Ermolov,N F Furmanets,D Karmanov,A V Karpov,G D Kekelidze,V I Kireev,A A Kiryakov,A G Kholodenko,E S Kokoulina, V V Konstantinov,Viktor Kramarenko,A Kubarovsky, A K Kulikov,E A Kuraev,L Kurchaninov,A Ya Kutov,N A Kuzmin,G I Lanschikov A K Leflat,I S Lobanov, E V Lobanova,S I Lyutov, V N Lysan,M Merkin,G A Mitrofanov,V V Myalkovskiy,V A Nikitin, V D Peshehonov,V Petrov,Y Petukhov,A V Pleskach,M K Polkovnikov,V V Popov,V N Riadovikov, V Ronzhin,I A Rufanov,V A Senko,N Shalanda,M M Soldatov, V I Spiryakin,A V Terletskiy,L A Tikhonova,Yu Tsyupa, A M Vishnevskaya,V Yu Volkov,A P Vorobiev,A G Voronin,V I Yakimchuk,A I Yukaev, V N Zapolskii,N K Zhidkov,S A Zotkin,E G Zverev

EPJ Web of Conferences（2012）

Cited 5|Views47

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Abstract

The results of E-190 experiment (project Thermalization) with 50 GeV proton beam irradiation of SVD-2 setup are presented. MC simulation has shown the linear dependence of number of photons detected in electromagnetic calorimeter and the average number of neutral pions. Multiplicity distribution of neutral pion, N-0, for total number of particles in the event, N-tot = N-ch + N-0, are obtained with corrections on the setup acceptance, triggering and efficiency of the event reconstruction. The scaled variance of neutral pion fluctuations, omega = D/ < N-0 >, versus total multiplicity is measured. The fluctuations increase at N-tot > 18. According to quantum statistics models this behavior can indicate a pion condensate formation in the high pion multiplicity system. This effect has been observed for the first time.

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Key words

quantum statistics,high energy physics

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