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

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

Journal: EPJ Web of Conferences
ISSN 2100-014X

Volume: 37;
Start page: 06002;
Date: 2012;
Original page

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, N0, for total number of particles in the event, Ntot = Nch + N0, are obtained with corrections on the setup acceptance, triggering and efficiency of the event reconstruction. The scaled variance of neutral pion fluctuations, ω = D/ < N0 >, versus total multiplicity is measured. The fluctuations increase at Ntot > 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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Tango Rapperswil
Tango Rapperswil