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

All issues

Volume 37 (2012)

EPJ Web of Conferences, 37 (2012) 06002

Abstract

Open Access

Issue		EPJ Web of Conferences Volume 37, 2012 MESON 2012 – 12^th International Workshop on Production, Properties and Interaction of MESONS


Article Number		06002
Number of page(s)		5
Section		Meson production - parallel talks
DOI		https://doi.org/10.1051/epjconf/20123706002
Published online		06 December 2012

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.

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