Now showing 1 - 2 of 2
  • Publication
    Reconstruction of 400 GeV/c proton interactions with the SHiP-charm project
    (2024-06-01)
    Ahdida, C.
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    Akmete, A.
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    Bieschke, S.
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    Borburgh, J.
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    Chumakov, A.
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    Cornelis, K.
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    D’Ambrosio, N.
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    D’Appollonio, G.
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    de Asmundis, R.
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    De Carvalho Saraiva, J.
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    Di Giulio, L.
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    Dijkstra, H.
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    Dougherty, L. A.
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    Drohan, V.
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    Durhan, O.
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    Ehlert, M.
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    Elikkaya, E.
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    Graverini, E.
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    Grenard, J. L.
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    Lyubovitskij, V.
    AbstractThe SHiP-charm project was proposed to measure the associated charm production induced by 400 GeV/c protons in a thick target, including the contribution from cascade production. An optimisation run was performed in July 2018 at CERN SPS using a hybrid setup. The high resolution of nuclear emulsions acting as vertex detector was complemented by electronic detectors for kinematic measurements and muon identification. Here we present first results on the analysis of nuclear emulsions exposed in the 2018 run, which prove the capability of reconstructing proton interaction vertices in a harsh environment, where the signal is largely dominated by secondary particles produced in hadronic and electromagnetic showers within the lead target.
  • Publication
    Measurement of the beam asymmetry Σ and the target asymmetry T in the photoproduction of ω mesons off the proton using CLAS at Jefferson Laboratory
    (2018-05-04)
    Roy, P.
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    Akbar, Z.
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    Park, S.
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    Crede, V.
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    Anisovich, A. V.
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    Denisenko, I.
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    Klempt, E.
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    Nikonov, V. A.
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    Sarantsev, A. V.
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    Adhikari, K. P.
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    Adhikari, S.
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    Anefalos Pereira, S.
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    Ball, J.
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    Balossino, I.
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    Bashkanov, M.
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    Battaglieri, M.
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    Batourine, V.
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    Bedlinskiy, I.
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    Biselli, A. S.
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    Boiarinov, S.
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    Briscoe, W. J.
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    Brock, J.
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    Burkert, V. D.
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    Carlin, C.
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    Carman, D. S.
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    Celentano, A.
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    Charles, G.
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    Chetry, T.
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    Ciullo, G.
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    Clary, B. A.
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    Cole, P. L.
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    Contalbrigo, M.
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    D'Angelo, A.
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    Dashyan, N.
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    De Vita, R.
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    Deur, A.
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    Djalali, C.
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    Dugger, M.
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    Dupre, R.
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    El Fassi, L.
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    Elouadrhiri, L.
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    Eugenio, P.
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    Fedotov, G.
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    Fegan, S.
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    Filippi, A.
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    Fradi, A.
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    Gavalian, G.
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    Gevorgyan, N.
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    Gilfoyle, G. P.
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    Giovanetti, K. L.
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    Girod, F. X.
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    Gleason, C.
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    Gohn, W.
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    Golovatch, E.
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    Gothe, R. W.
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    Griffioen, K. A.
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    Guidal, M.
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    Guo, L.
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    Hafidi, K.
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    Hanretty, C.
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    Hattawy, M.
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    Hicks, K.
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    Holtrop, M.
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    Ilieva, Y.
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    Ireland, D. G.
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    Ishkhanov, B. S.
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    Isupov, E. L.
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    Jenkins, D.
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    Joo, K.
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    Joosten, S.
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    Keith, C. D.
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    Keller, D.
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    Khachatryan, G.
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    Khandaker, M.
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    Kim, A.
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    Kim, W.
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    Klein, A.
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    Klein, F. J.
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    Kubarovsky, V.
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    Lanza, L.
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    Lenisa, P.
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    Livingston, K.
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    Lu, H. Y.
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    Macgregor, I. J.D.
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    Markov, N.
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    Mayer, M.
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    McCracken, M. E.
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    McKinnon, B.
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    Meekins, D. G.
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    Meyer, C. A.
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    Meziani, Z. E.
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    Mokeev, V.
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    Montgomery, R. A.
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    Movsisyan, A.
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    Munoz Camacho, C.
    The photoproduction of ω mesons off the proton has been studied in the reaction γp → p ω using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target in Hall B at the Thomas Jefferson National Accelerator Facility. For the first time, the target asymmetry T has been measured in photoproduction from the decay ω → π+π−π0, using a transversely polarized target with energies ranging from just above the reaction threshold up to 2.8 GeV. Significant nonzero values are observed for these asymmetries, reaching about 30–40% in the third-resonance region. New measurements for the photon-beam asymmetry are also presented, which agree well with previous CLAS results and extend the world database up to 2.1 GeV. These data and additional ω photoproduction observables from CLAS were included in a partial-wave analysis within the Bonn-Gatchina framework. Significant contributions from s-channel resonance production were found in addition to t-channel exchange processes.