Fluctuations of the number of neutral pions at high multiplicity in pp interactions at 50 GeV

Ryadovikov, V.N.; 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.; Bogolyubsky, M.Y.; Budilov, V.A.; Burzunov, Y.T.; Chentsov, Y.A.; Ermakov, G.G.; Ermolov, P.F.; Furmanets, N.F.; Golovkin, V.F.; Golovnya, S.N.; Gorokhov, S.A.; Grishin, N.I.; Grishkevich, Y.V.; Karmanov, D.E.; Karpov, A.V.; Kekelidze, G.D.; Kholodenko, A.G.; Kireev, V.I.; Kiryakov, A.A.; Kokoulina, E.S.; Konstantinov, V.V.; Kramarenko, V.N.; Kubarovsky, A.V.; Kurchaninov, L.L.; Kutov, A.Y.; Kuzmin, N.A.; Lanschikov, G.I.; Leflat, A.K.; Lobanov, I.S.; Lobanova, E.V.; Lyutov, S.I.; Lysan, V.N.; Merkin, M.M.; Mitrofanov, G.Y.; 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.; Senko, V.A.; Shalanda, N.A.; Soldatov, M.M.; Spiryakin, V.I.; Terletskiy, A.V.; Tikhonova, L.A.; Tsyupa, Y.P.; Vishnevskaya, A.M.; Volkov, V.Y.; Vorobiev, A.P.; Voronin, A.G.; Yakimchuk, V.I.; Yukaev, A.I.; Zapolskii, V.N.; Zhidkov, N.K.; Zotkin, S.A.; Zverev, E.G.

Авторы: Ryadovikov V.N., 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., Bogolyubsky M.Yu, Budilov V.A., Burzunov Yu T., 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., Karpov A.V., Kekelidze G.D., Kholodenko A.G., Kireev V.I., Kiryakov A.A., Kokoulina E.S., Konstantinov V.V., Kramarenko V.N., Kubarovsky A.V., Kurchaninov L.L., Kutov A.Ya, Kuzmin N.A., Lanschikov G.I., Leflat A.K., Lobanov I.S., Lobanova E.V., Lyutov S.I., Lysan V.N., Merkin M.M., Mitrofanov G.Ya, Myalkovskiy V.V., Nikitin V.A., Peshehonov V.D., Petrov V.S., Petukhov Yu P., Pleskach A.V., Polkovnikov M.K., Popov V.V., Ronzhin V.N., Rufanov I.A., Senko V.A., Shalanda N.A., Soldatov M.M., Spiryakin V.I., Terletskiy A.V., 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 and E.G
Журнал: Physics of Atomic Nuclei
Том: 75
Номер: 8
Год издания: 2012
Издательство: Pleiades Publishing, Ltd
Местоположение издательства: Road Town, United Kingdom
Первая страница: 989
Последняя страница: 998
DOI: 10.1134/S1063778812080091
Аннотация: Results obtained by measuring ﬂuctuations of the number of neutral pions in the SERP-Е- 190 Experiment (Thermalization Project) upon irradiating a liquid-hydrogen target of the SVD-2 setup with a beam of 50-GeV protons are presented. A simulation of the detection of photons from the decay of neutral pions with the aid of an electromagnetic calorimeter revealed a linear relation between the number of detected photons and the mean number of neutral pions in an event. After the introduction of corrections for the loss of charged tracks because of a limited acceptance of the setup, trigger operation, and the eﬃciency of the data-treatment system, distributions of the number of neutral pions, N0, were obtained for each value of the total number of particles in an event, Ntot = Nch + N0. The ﬂuctuation parameter ω = D/N0 was measured. In the region Ntot > 22, ﬂuctuations of the number of neutral pions increase, which, within statistical models (GCE, CE, MCE), indicates that the system involving a large number of pions approaches the pion-condensate state. This eﬀect was observed for the ﬁrst time.
Добавил в систему: Попов Всеволод Валентинович

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Fluctuations of the number of neutral pions at high multiplicity in pp interactions at 50 GeVстатья