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  1. Book ; Online: Study of the process $e^+e^- \to \eta\eta\gamma$ in the energy range $\sqrt{s} = \mbox{1.17--2.00}$ GeV with the SND detector

    SND Collaboration / Achasov, M. N. / Barnyakov, A. Yu. / Beloborodov, K. I. / Berdyugin, A. V. / Berkaev, D. E. / Bogdanchikov, A. G. / Botov, A. A. / Dimova, T. V. / Druzhinin, V. P. / Kirpotin, A. N. / Kardapoltsev, L. V. / Kasaev, A. S. / Kharlamov, A. G. / Koop, I. A. / Korol, A. A. / Kovrizhin, D. P. / Kupich, A. S. / Martin, K. A. /
    Melnikova, N. A. / Muchnoy, N. Yu. / Obrazovsky, A. E. / Pakhtusova, E. V. / Pugachev, K. V. / Rabusov, D. V. / Rogovsky, Yu. A. / Senchenko, A. I. / Serednyakov, S. I. / Shatilov, D. N. / Shatunov, Yu. M. / Shtol, D. A. / Shwartz, D. B. / Silagadze, Z. K. / Surin, I. K. / Timoshenko, M. V. / Usov, Yu. V. / Zhabin, V. N. / Zhulanov, V. V.

    2021  

    Abstract: The process $e^+e^-\to\eta\eta\gamma$ is studied in the center-of-mass energy range 1.17-2.00 GeV using data with an integrated luminosity of 201 pb$^{-1}$collected by the SND detector at the VEPP-2000 $e^+e^-$ collider. The $e^+e^-\to\eta\eta\gamma$ ... ...

    Abstract The process $e^+e^-\to\eta\eta\gamma$ is studied in the center-of-mass energy range 1.17-2.00 GeV using data with an integrated luminosity of 201 pb$^{-1}$collected by the SND detector at the VEPP-2000 $e^+e^-$ collider. The $e^+e^-\to\eta\eta\gamma$ cross section is measured for the first time. It is shown that the dominant mechanism of this reaction is the transition through the $\phi\eta$ intermediate state. Our result on the $e^+e^-\to\eta\eta\gamma$ cross section is consistent with the $e^+e^-\to\phi\eta$ measurement in the $\phi\to K^+ K^-$ mode. The search for radiative processes contributing to the $e^+e^-\to\eta\eta\gamma$ cross section is performed, and no significant signal is observed.

    Comment: 6 pages, 3 figures, to be submitted to European Physical Journal C. arXiv admin note: text overlap with arXiv:2006.05465
    Keywords High Energy Physics - Experiment
    Subject code 551
    Publishing date 2021-10-12
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article: Experimental investigation of high-energy photon splitting in atomic fields.

    Akhmadaliev, Sh Zh / Kezerashvili, G Ya / Klimenko, S G / Lee, R N / Malyshev, V M / Maslennikov, A L / Milov, A M / Milstein, A I / Muchnoi, N Yu / Naumenkov, A I / Panin, V S / Peleganchuk, S V / Pospelov, G E / Protopopov, I Ya / Romanov, L V / Shamov, A G / Shatilov, D N / Simonov, E A / Strakhovenko, V M /
    Tikhonov, Yu A

    Physical review letters

    2002  Volume 89, Issue 6, Page(s) 61802

    Abstract: Data analysis of an experiment in which photon splitting in atomic fields was observed is presented. The experiment was performed at the tagged photon beam of the ROKK-1M facility at the VEPP-4M collider. In the energy region of 120-450 MeV, statistics ... ...

    Abstract Data analysis of an experiment in which photon splitting in atomic fields was observed is presented. The experiment was performed at the tagged photon beam of the ROKK-1M facility at the VEPP-4M collider. In the energy region of 120-450 MeV, statistics of 1.6x10(9) photons incident on the BGO target was collected. About 400 candidate photon-splitting events were reconstructed. Within the attained experimental accuracy, the experimental results are consistent with the calculated exact atomic-field cross section. The predictions obtained in the Born approximation differ significantly from the experimental results.
    Language English
    Publishing date 2002-08-05
    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.89.061802
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Recent Results from the KEDR Detector

    Sinyatkin S.V. / Shwartz B.A. / Simonov E.A. / Shatilov D.N. / Shamov A.G. / Savinov G.A. / Sandyrev V.K. / Ruban A.A. / Prisekin V.G. / Poluektov A.O. / Petrov V.V. / Pivovarov S.G. / Piminov P.A. / Peleganchuk S.V. / Orlov I.O. / Osipov A.A. / Oreshkin S.B. / Onuchin A. P. / Nikolaev I.B. /
    Okunev I.N. / Nikitin S.A. / Neufeld V.V. / Muchnoi N.Yu. / Morozov I. I. / Mishnev S. I. / Meshkov O. I. / Medvedko A. S. / Maslennikov A. L. / Maksimov D.A. / Malyshev V.M. / Levichev E. B. / Kuper E.A. / Kulikov V. F. / Kurkin G.Ya. / Kudryavtsev V.N. / Kravchenko E.A. / Kotov K.Yu. / Kononov S.A. / Kolmogorov V.V. / Kiselev V.A. / Kharlamova T.A. / Karpov S.V. / Karpov G.V. / Karnaev S. E. / Gusev D.V. / Gulevich V.V. / Glukhovchenko Yu.M. / Eidelman S. I. / Grigoriev D.N. / Buzykaev A.R. / Bogomyagkov A.V. / Bondar A. E. / Bobrovnikov V. S. / Bobrov A.V. / Blinov V. E. / Blinov A. E. / Beloborodova O. L. / Basok I.Yu. / Baru S. E. / Barnyakov M.Yu. / Barnyakov A.Yu. / Barladyan A.K. / Aulchenko V.M. / Baldin E.M. / Anashin V.V. / Skrinsky A.N. / Smaluk V.V. / Sokolov A.V. / Sukharev A.M. / Starostina E.V. / Talyshev A.A. / Tayursky V.A. / Telnov V. I. / Tikhonov Yu.A. / Todyshev K.Yu. / Tumaikin G.M. / Usov Yu.V. / Vorobiov A. I. / Yushkov A.N. / Zhilich V.N. / Zhulanov V.V. / Zhuravlev A.N.

    EPJ Web of Conferences, Vol 37, p

    2012  Volume 09014

    Abstract: We describe recent results from the KEDR detector at the VEPP-4Mcollider. They include: a search for narrow resonances between 1.85 and 3.1 GeV, a test of leptonic universality by comparing partial widths of the J/ψ resonance into electron and muon pairs, ...

    Abstract We describe recent results from the KEDR detector at the VEPP-4Mcollider. They include: a search for narrow resonances between 1.85 and 3.1 GeV, a test of leptonic universality by comparing partial widths of the J/ψ resonance into electron and muon pairs, a determination of the main parameters of the ψ(2S) and a measurement of ψ(3770) parameters.
    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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  4. Book ; Online: Measurement of \Gamma_{ee}(J/\psi)*Br(J/\psi->e^+e^-) and \Gamma_{ee}(J/\psi)*Br(J/\psi->\mu^+\mu^-)

    KEDR Collaboration / Anashin, V. V. / Aulchenko, V. M. / Baldin, E. M. / Barladyan, A. K. / Barnyakov, A. Yu. / Barnyakov, M. Yu. / Baru, S. E. / Bedny, I. V. / Beloborodova, O. L. / Blinov, A. E. / Blinov, V. E. / Bobrov, A. V. / Bobrovnikov, V. S. / Bogomyagkov, A. V. / Bondar, A. E. / Bondarev, D. V. / Buzykaev, A. R. / Eidelman, S. I. /
    Glukhovchenko, Yu. M. / Gulevich, V. V. / Gusev, D. V. / Karnaev, S. E. / Karpov, G. V. / Karpov, S. V. / Kharlamova, T. A. / Kiselev, V. A. / Kononov, S. A. / Kotov, K. Yu. / Kravchenko, E. A. / Kulikov, V. F. / Kurkin, G. Ya. / Kuper, E. A. / Levichev, E. B. / Maksimov, D. A. / Malyshev, V. M. / Maslennikov, A. L. / Medvedko, A. S. / Meshkov, O. I. / Mishnev, S. I. / Morozov, I. I. / Muchnoi, N. Yu. / Neufeld, V. V. / Nikitin, S. A. / Nikolaev, I. B. / Okunev, I. N. / Onuchin, A. P. / Oreshkin, S. B. / Orlov, I. O. / Osipov, A. A. / Peleganchuk, S. V. / Pivovarov, S. G. / Piminov, P. A. / Petrov, V. V. / Poluektov, A. O. / Popkov, I. N. / Prisekin, V. G. / Ruban, A. A. / Sandyrev, V. K. / Savinov, G. A. / Shamov, A. G. / Shatilov, D. N. / Shwartz, B. A. / Simonov, E. A. / Sinyatkin, S. V. / Skovpen, Yu. I. / Skrinsky, A. N. / Smaluk, V. V. / Sokolov, A. V. / Sukharev, A. M. / Starostina, E. V. / Talyshev, A. A. / Tayursky, V. A. / Telnov, V. I. / Tikhonov, Yu. A. / Todyshev, K. Yu. / Tumaikin, G. M. / Usov, Yu. V. / Vorobiov, A. I. / Yushkov, A. N. / Zhilich, V. N. / Zhulanov, V. V. / Zhuravlev, A. N.

    2009  

    Abstract: The products of the electron width of the J/\psi meson and the branching fraction of its decays to the lepton pairs were measured using data from the KEDR experiment at the VEPP-4M electron-positron collider. The results are \Gamma_{ee}(J/\psi)*Br(J/\psi- ...

    Abstract The products of the electron width of the J/\psi meson and the branching fraction of its decays to the lepton pairs were measured using data from the KEDR experiment at the VEPP-4M electron-positron collider. The results are \Gamma_{ee}(J/\psi)*Br(J/\psi->e^+e^-)=(0.3323\pm0.0064\pm0.0048) keV, \Gamma_{ee}(J/\psi)*Br(J/\psi->\mu^+\mu^-)=(0.3318\pm0.0052\pm0.0063) keV. Their combinations \Gamma_{ee}\times(\Gamma_{ee}+\Gamma_{\mu\mu})/\Gamma=(0.6641\pm0.0082\pm0.0100) keV, \Gamma_{ee}/\Gamma_{\mu\mu}=1.002\pm0.021\pm0.013 can be used to improve theaccuracy of the leptonic and full widths and test leptonic universality. Assuming e\mu universality and using the world average value of the lepton branching fraction, we also determine the leptonic \Gamma_{ll}=5.59\pm0.12 keV and total \Gamma=94.1\pm2.7 keV widths of the J/\psi meson.

    Comment: 7 pages, 6 figures
    Keywords High Energy Physics - Experiment
    Subject code 612
    Publishing date 2009-12-06
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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