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  1. Article ; Online: Search for Invisible Decays of Sub-GeV Dark Photons in Missing-Energy Events at the CERN SPS.

    Banerjee, D / Burtsev, V / Cooke, D / Crivelli, P / Depero, E / Dermenev, A V / Donskov, S V / Dubinin, F / Dusaev, R R / Emmenegger, S / Fabich, A / Frolov, V N / Gardikiotis, A / Gninenko, S N / Hösgen, M / Kachanov, V A / Karneyeu, A E / Ketzer, B / Kirpichnikov, D V /
    Kirsanov, M M / Kovalenko, S G / Kramarenko, V A / Kravchuk, L V / Krasnikov, N V / Kuleshov, S V / Lyubovitskij, V E / Lysan, V / Matveev, V A / Mikhailov, Yu V / Myalkovskiy, V V / Peshekhonov, V D / Peshekhonov, D V / Petuhov, O / Polyakov, V A / Radics, B / Rubbia, A / Samoylenko, V D / Tikhomirov, V O / Tlisov, D A / Toropin, A N / Trifonov, A Yu / Vasilishin, B / Vasquez Arenas, G / Ulloa, P / Zhukov, K / Zioutas, K

    Physical review letters

    2017  Volume 118, Issue 1, Page(s) 11802

    Abstract: We report on a direct search for sub-GeV dark photons (A^{'}), which might be produced in the reaction e^{-}Z→e^{-}ZA^{'} via kinetic mixing with photons by 100 GeV electrons incident on an active target in the NA64 experiment at the CERN SPS. The dark ... ...

    Abstract We report on a direct search for sub-GeV dark photons (A^{'}), which might be produced in the reaction e^{-}Z→e^{-}ZA^{'} via kinetic mixing with photons by 100 GeV electrons incident on an active target in the NA64 experiment at the CERN SPS. The dark photons would decay invisibly into dark matter particles resulting in events with large missing energy. No evidence for such decays was found with 2.75×10^{9} electrons on target. We set new limits on the γ-A^{'} mixing strength and exclude the invisible A^{'} with a mass ≲100  MeV as an explanation of the muon g_{μ}-2 anomaly.
    Language English
    Publishing date 2017-01-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.118.011802
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Neutral pion number fluctuations at high multiplicity in pp-interactions at 50 GeV

    Popov V. V. / Polkovnikov M. K. / Pleskach A. V. / Petukhov Y. P. / Petrov V. S. / Peshehonov V. D. / Nikitin V. A. / Myalkovskiy V. V. / Mitrofanov G. A. / Merkin M. M. / Lysan V. N. / Lyutov S. I. / Lobanova E. V. / Lobanov I. S. / Leflat A. K. / Lanschikov G. I. / Kutov A. Ya. / Kurchaninov L. L. / Kubarovsky A. V. /
    Konstantinov V. V. / Kramarenko V. N. / Kokoulina E. S. / Kiryakov A. A. / Kireev V. I. / Kholodenko A. G. / Kekelidze G. D. / Karmanov D. E. / Grishkevich Ya. V. / Grishin N. I. / Gorokhov S. A. / Golovnya S. N. / Golovkin V. F. / Furmanets N. F. / Ermolov P. F. / Ermakov G. G. / Chentsov Yu. A. / Budilov V. A. / Borzunov Yu. T. / Bogdanova G. A. / Berezhnev S. F. / Batouritski M. A. / Basiladze S. G. / Balandin V. P. / Avdeichikov V. V. / Ardashev E. N. / Aleev A. N. / Afonin A. G. / 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.

    EPJ Web of Conferences, Vol 37, p

    2012  Volume 06002

    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 ... ...

    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.
    Keywords Physics ; QC1-999 ; Science ; Q ; DOAJ:Physics (General) ; DOAJ:Physics and Astronomy
    Language English
    Publishing date 2012-12-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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