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. A. Batouritski; S. F. Berezhnev; G. A. Bogdanova; Yu. T. Borzunov; V. A. Budilov; Yu. A. Chentsov; G. G. Ermakov; P. F. Ermolov; N. F. Furmanets; V. F. Golovkin; S. N. Golovnya; S. A. Gorokhov; N. I. Grishin; Ya. V. Grishkevich; D. E. Karmanov; G. D. Kekelidze; A. G. Kholodenko; V. I. Kireev; A. A. Kiryakov; E. S. Kokoulina; V. N. Kramarenko; V. V. Konstantinov; A. V. Kubarovsky; L. L. Kurchaninov; A. Ya. Kutov; G. I. Lanschikov; A. K. Leflat; I. S. Lobanov; E. V. Lobanova; S. I. Lyutov; V. N. Lysan; M. M. Merkin; G. A. Mitrofanov; V. V. Myalkovskiy; V. A. Nikitin; V. D. Peshehonov; V. S. Petrov; Y. P. Petukhov; A. V. Pleskach; M. K. Polkovnikov; V. V. Popov; V. N. Ronzhin; I. A. Rufanov; V. N. Ryadovikov; V. A. Senko; N. A. Shalanda; M. M. Soldatov; L. A. Tikhonova; Yu. P. 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

doi:10.1051/epjconf/20123706002

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Proceedings

Open Access

EPJ Web of Conferences 37, 06002 (2012)
https://doi.org/10.1051/epjconf/20123706002

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

A. G. Afonin¹, A. N. Aleev², E. N. Ardashev¹, V. V. Avdeichikov², V. P. Balandin², S. G. Basiladze³, M. A. Batouritski⁴, S. F. Berezhnev³, G. A. Bogdanova³, Yu. T. Borzunov², V. A. Budilov², Yu. A. Chentsov², G. G. Ermakov³, P. F. Ermolov³, N. F. Furmanets², V. F. Golovkin¹, S. N. Golovnya¹, S. A. Gorokhov¹, N. I. Grishin³, Ya. V. Grishkevich³, D. E. Karmanov³, G. D. Kekelidze², A. G. Kholodenko¹, V. I. Kireev², A. A. Kiryakov¹, E. S. Kokoulina², V. N. Kramarenko³, V. V. Konstantinov¹, A. V. Kubarovsky³, L. L. Kurchaninov¹, A. Ya. Kutov⁵, G. I. Lanschikov², A. K. Leflat³, I. S. Lobanov¹, E. V. Lobanova¹, S. I. Lyutov³, V. N. Lysan², M. M. Merkin³, G. A. Mitrofanov¹, V. V. Myalkovskiy², V. A. Nikitin², V. D. Peshehonov², V. S. Petrov¹, Y. P. Petukhov², A. V. Pleskach¹, M. K. Polkovnikov¹, V. V. Popov³, V. N. Ronzhin¹, I. A. Rufanov², V. N. Ryadovikov¹^a, V. A. Senko¹, N. A. Shalanda¹, M. M. Soldatov¹, L. A. Tikhonova³, Yu. P. Tsyupa¹, A. M. Vishnevskaya³, V. Yu. Volkov³, A. P. Vorobiev¹, A. G. Voronin³, V. I. Yakimchuk¹, A. I. Yukaev², V. N. Zapolskii¹, N. K. Zhidkov², S. A. Zotkin³ and E. G. Zverev³

¹ IHEP, Protvino, Moscow region, Russia
² JINR, Dubna, Moscow region, Russia
³ SINP MSU, Moscow, Russia
⁴ NC PHEP BSU, Minsk, Belarus
⁵ Department of Mathematics Komi SC UrD RAS, Syktyvkar, Russia

^a e-mail: riadovikov@ihep.ru

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, N_tot = N_ch + 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 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.

© Owned by the authors, published by EDP Sciences, 2012

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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