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Akhunzyanov, R.; Alexeev, G.D.; Anosov, V.; Ball, M.; Beck, R.; Bernhard, J.; Bielert, E.R.; Birsa, R.; Bodlak, M.; Bordalo, P.; Bradamante, F.; Büchele, M.; Burtsev, V.E.; Chiosso, M.; Chumakov, A.G.; Chung, S.-U.; Cicuttin, A.; Crespo, M.L.; Denisov, O.Yu; Donskov, S.V.; Doshita, N.; Dünnweber, W.; Dziewiecki, M.; Eversheim, P.D.; Fischer, H.; Franco, C.; Frolov, V.; Gautheron, F.; Gavrichtchouk, O.P.; Gerassimov, S.; Giarra, J.; Gnesi, I.; Gorzellik, M.; Grasso, A.; Grube, B.; Hamar, G.; von Harrach, D.; Heitz, R.; Huber, S.; Ishimoto, S.; Iwata, T.; Joosten, R.; Jörg, P.; Juraskova, K.; Ketzer, B.; Khaustov, G.V.; Khokhlov, Yu.A.; Klein, F.; Koivuniemi, J.H.; Kondo, K.; Kotzinian, A.M.; Kroumchtein, Z.V.; Kurek, K.; Kuznetsov, I.I.; Lian, Y.-S.; Marianski, B.; Meyer, M.; Meyer, W.; Mitrofanov, N.; Moretti, A.; Nerling, F.; Neyret, D.; Nowak, W.-D.; Nukazuka, G.; Olshevsky, A.G.; Paul, S.; Pereira, F.; Pešek, M.; Peshekhonov, D.V.; Pierre, N.; Polyakov, V.A.; Quintans, C.; Ramos, S.; Regali, C.; Reicherz, G.; Riedl, C.; Rogacheva, N.S.; Ryabchikov, D.I.; Rybnikov, A.; Salac, R.; Sandacz, A.; Sawada, T.; Schiavon, P.; Schönning, K.; Seder, E.; Sinha, L.; Stolarski, M.; Subrt, O.; Suzuki, H.; Szameitat, T.; Sznajder, P.; Tasevsky, M.; Thiel, A.; Tskhay, V.; Vauth, A.; Veit, B.M.; Vidon, A.; Wallner, S.; Wilfert, M.; Zavertyaev, M.
Physics letters. B, 06/2019, Letnik: 793Journal Article
We report on the first measurement of exclusive single-photon muoproduction on the proton by COMPASS using 160GeV/c polarised μ+ and μ− beams of the CERN SPS impinging on a liquid hydrogen target. We determine the dependence of the average of the measured μ+ and μ− cross sections for deeply virtual Compton scattering on the squared four-momentum transfer t from the initial to the final proton. The slope B of the t-dependence is fitted with a single exponential function, which yields B=(4.3±0.6stat|sys−0.3+0.1)(GeV/c)−2. This result can be converted into a transverse extension of partons in the proton, 〈r⊥2〉=(0.58±0.04stat|sys−0.02+0.01±0.04model)fm. For this measurement, the average virtuality of the photon mediating the interaction is 〈Q2〉=1.8(GeV/c)2 and the average value of the Bjorken variable is 〈xBj〉=0.056.
