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Now showing items 1 - 3 of 3

  • High precision measurement of Compton scattering in the 5 GeV region

    Ambrozewicz, P.   Ye, L.   Prok, Y.   Larin, I   Ahmidouch, A.   Baker, K.   Baturin, V   Benton, L.   Bernstein, A.   Burkert, V   Clinton, E.   Cole, P. L.   Collins, P.   Dale, D.   Danagoulian, S.   Davidenko, G.   Demirchyan, R.   Deur, A.   Dolgolenko, A.   Dutta, D.   Dzyubenko, G.   Evdokimov, A.   Fedotov, G.   Feng, J.   Gabrielyan, M.   Gan, L.   Gao, H.   Gasparian, A.   Gevorkyan, N.   Gevorkyan, S.   Glamazdin, A.   Goryachev, V   Guo, L.   Gyurjyan, V   Hardy, K.   He, J.   Isupov, E.   Ito, M. M.   Jiang, L.   Kang, H.   Kashy, D.   Khandaker, M.   Kingsberry, P.   Klein, F.   Kolarkar, A.   Konchatnyi, M.   Korchin, O.   Korsch, W.   Kosinov, O.   Kowalski, S.   Kubantsev, M.   Kubarovsky, A.   Kubarovsky, V   Lawrence, D.   Li, X.   Levillain, M.   Lu, H.   Ma, L.   Martel, P.   Matveev, V   McNulty, D.   Mecking, B.   Micherdzinska, A.   Milbrath, B.   Minehart, R.   Miskimen, R.   Mochalov, V   Morrison, B.   Mtingwa, S.   Nakagawa, I   Overby, S.   Pasyuk, E.   Payen, M.   Park, K.   Pedroni, R.   Phelps, W.   Protopopescu, D.   Rimal, D.   Ritchie, B. G.   Romanov, D.   Salgado, C.   Shahinyan, A.   Sitnikov, A.   Sober, D.   Stepanyan, S.   Stephens, W.   Tarasov, V   Taylor, S.   Teymurazyan, A.   Underwood, J.   Vasiliev, A.   Vishnyakov, V.   Weygand, D. P.   Wood, M.   Zhang, Y.   Zhou, S.   Zihlmann, B.  

    The cross section of atomic electron Compton scattering gamma + e -> gamma' + e' was measured in the 4.400-5.475 GeV photon beam energy region by the PrimEx collaboration at Jefferson Lab with an accuracy of 2.6% and less. The results are consistent with theoretical predictions that include next-to-leading order radiative corrections. The measurements provide the first high precision test of this elementary QED process at beam energies greater than 0.1 GeV. (C) 2019 The Author(s). Published by Elsevier B.V.
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  • Charmed particles production in pA-interactions at root s=3D11.8 GeV

    Aleev, A.   Ardashev, E.   Afonin, A.   Balandin, V.   Basiladze, S.   Bogdanova, G.   Bogolyubsky, M.   Boguslavsky, M.   Dunun, V.   Gavrishchuk, O.   Golovnia, S.   Gorokhov, S.   Golovkin, V.   Grishin, N.   Grishkevich, Ya.   Ermolov, P.   Furmanec, N.   Karmanov, D.   Kholodenko, A.   Kireev, V.   Kiriyakov, A.   Konstantinov, V.   Kosarev, I.   Kokoulina, E.   Kozlov, V.   Kramarenko, V.   Kubarovsky, A.   Kuzmin, N.   Kurchaninov, L.   Lanshikov, G.   Larichev, A.   Leflat, A.   Lyutov, S.   Merkin, M.   Mitrofanov, G.   Moiseev, A.   Nikitin, V.   Orfanitsky, S.   Petrov, V.   Petukhov, Yu.   Pleskach, A.   Popov, V.   Riadovikov, V.   Ronjin, V.   Rufanov, I.   Senko, V.   Shalanda, N.   Soldatov, M.   Tikhonova, L.   Topuria, T.   Tsyupa, Yu.   Vasiliev, M.   Vischnevskaya, A.   Volkov, V.   Vorobiev, A.   Voronin, A.   Yakimchuk, V.   Yukaev, A.   Zapolsky, V.   Zmushko, V.   Zotkin, S.   Zotkin, D.   Zverev, E.  

    The results of the SERP-E-184 experiment at the U-70 accelerator (IHEP, Protvino) are presented. Interactions of the 70 GeV proton beam with carbon, silicon and lead targets were studied to detect decays of charmed D-0, (D) over bar (0), D+, D- mesons and Lambda(+)(c) baryon near their production threshold. Measurements of lifetimes and masses have shown a good agreement with PDG data. The inclusive cross-sections of charm production and their A-dependences have been obtained. The yields of these particles are compared with the theoretical predictions and the data of other experiments. The measured cross-section of the total open charm production (sigma(tot)(c (c) over bar) =3D 7.1 +/- 2.3(stat) +/- 1.4(syst) mu b/nucleon) at the collision c.m. energy root s =3D 11.8 GeV is well above the QCD model predictions. The contributions of different kinds of charmed particles to the total cross-section of the open charm production in proton-nucleus interactions vary with energy.
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  • Measurement of transparency ratios for protons from short-range correlated pairs

    Hen, O.   Hakobyan, H.   Shneor, R.   Piasetzky, E.   Weinstein, L. B.   Brooks, W. K.   Beck, S. May-Tal   Gilad, S.   Korover, I.   Beck, A.   Adhikari, K. P.   Aghasyan, M.   Amaryan, M. J.   Pereira, S. Anefalos   Arrington, J. R.   Baghdasaryan, H.   Ball, J.   Battaglieri, M.   Batourine, V.   Bedlinskiy, I.   Biselli, A. S.   Bono, J.   Boiarinov, S.   Briscoe, W. J.   Burkert, V. D.   Carman, D. S.   Celentano, A.   Chandavar, S.   Cole, P. L.   Contalbrigo, M.   Crede, V.   D'Angelo, A.   Dashyan, N.   De Vita, R.   De Sanctis, E.   Deur, A.   Djalali, C.   Dodge, G. E.   Doughty, D.   Dupre, R.   Egiyan, H.   El Alaoui, A.   El Fassi, L.   Eugenio, P.   Fedotov, G.   Fegan, S.   Fleming, J. A.   Gabrielyan, M. Y.   Gevorgyan, N.   Gilfoyle, G. P.   Giovanetti, K. L.   Girod, F. X.   Goetz, J. T.   Gohn, W.   Golovatch, E.   Gothe, R. W.   Griffioen, K. A.   Guo, L.   Hafidi, K.   Harrison, N.   Heddle, D.   Hicks, K.   Holtrop, M.   Hyde, C. E.   Ilieva, Y.   Ireland, D. G.   Ishkhanov, B. S.   Isupov, E. L.   Jo, H. S.   Joo, K.   Keller, D.   Khandaker, M.   Khetarpal, P.   Kim, A.   Klein, F. J.   Koirala, S.   Kubarovsky, A.   Kubarovsky, V.   Kuhn, S. E.   Livingston, K.   Lu, H. Y.   MacGregor, I. J. D.   Martinez, D.   Mayer, M.   McKinnon, B.   Mineeva, T.   Mokeev, V.   Montgomery, R. A.   Moutarde, H.   Munevar, E.   Camacho, C. Munoz   Mustapha, B.   Nadel-Turonski, P.   Nasseripour, R.   Niccolai, S.   Niculescu, G.   Niculescu, I.   Osipenko, M.   Ostrovidov, A. I.   Pappalardo, L. L.   Paremuzyan, R.   Park, K.   Park, S.   Pasyuk, E.   Phelps, E.   Phillips, J. J.   Pisano, S.   Pivnyuk, N.   Pogorelko, O.   Pozdniakov, S.   Price, J. W.   Procureur, S.   Protopopescu, D.   Puckett, A. J. R.   Raue, B. A.   Rimal, D.   Ripani, M.   Ritchie, B. G.   Rosner, G.   Rossi, P.   Sabatie, F.   Saini, M. S.   Schott, D.   Schumacher, R. A.   Seraydaryan, H.   Sharabian, Y. G.   Smith, G. D.   Sober, D. I.   Sokhan, D.   Stepanyan, S. S.   Stepanyan, S.   Strauch, S.   Taiuti, M.   Tang, W.   Taylor, C. E.   Tian, Ye   Tkachenko, S.   Ungaro, M.   Vernarsky, B.   Vlassov, A.   Voskanyan, H.   Voutier, E.   Walford, N. K.   Watts, D. P.   Wood, M. H.   Zachariou, N.   Zana, L.   Zhang, J.   Zheng, X.   Zonta, I.  

    Nuclear transparency, T-p(A), is a measure of the average probability for a struck proton to escape the nucleus without significant re-interaction. Previously, nuclear transparencies were extracted for quasi-elastic A(e, e' p) knockout of protons with momentum below the Fermi momentum, where the spectral functions are well known. In this Letter we extract a novel observable, the transparency ratio, T-p(A)/T-p(C-12), for knockout of high-missing-momentum protons from the breakup of short-range correlated pairs (2N-SRC) in Al, Fe and Pb nuclei relative to C. The ratios were measured at momentum transfer Q(2) >= 1.5 (GeV/c)(2) and x(B) >= 1.2 where the reaction is expected to be dominated by electron scattering from 2N-SRC. The transparency ratios of the knocked-out protons coming from 2N-SRC breakup are 20-30% lower than those of previous results for low missing momentum. They agree with Glauber calculations and agree with renormalization of the previously published transparencies as proposed by recent theoretical investigations. The new transparencies scale as A(-1/3), which is consistent with dominance of scattering from nucleons at the nuclear surface. (C) 2013 Elsevier B.V. All rights reserved.
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