Physics Letters B (Jun 2019)

Transverse extension of partons in the proton probed in the sea-quark range by measuring the DVCS cross section

  • R. Akhunzyanov,
  • M.G. Alexeev,
  • G.D. Alexeev,
  • A. Amoroso,
  • V. Andrieux,
  • N.V. Anfimov,
  • V. Anosov,
  • A. Antoshkin,
  • K. Augsten,
  • W. Augustyniak,
  • A. Austregesilo,
  • C.D.R. Azevedo,
  • B. Badełek,
  • F. Balestra,
  • M. Ball,
  • J. Barth,
  • R. Beck,
  • Y. Bedfer,
  • J. Bernhard,
  • K. Bicker,
  • E.R. Bielert,
  • R. Birsa,
  • M. Bodlak,
  • P. Bordalo,
  • F. Bradamante,
  • A. Bressan,
  • M. Büchele,
  • E. Burtin,
  • V.E. Burtsev,
  • W.-C. Chang,
  • C. Chatterjee,
  • M. Chiosso,
  • I. Choi,
  • A.G. Chumakov,
  • S.-U. Chung,
  • A. Cicuttin,
  • M.L. Crespo,
  • S. Dalla Torre,
  • S.S. Dasgupta,
  • S. Dasgupta,
  • O.Yu. Denisov,
  • L. Dhara,
  • S.V. Donskov,
  • N. Doshita,
  • Ch. Dreisbach,
  • W. Dünnweber,
  • R.R. Dusaev,
  • M. Dziewiecki,
  • A. Efremov,
  • P.D. Eversheim,
  • M. Faessler,
  • A. Ferrero,
  • M. Finger,
  • M. Finger, jr.,
  • H. Fischer,
  • C. Franco,
  • N. du Fresne von Hohenesche,
  • J.M. Friedrich,
  • V. Frolov,
  • E. Fuchey,
  • F. Gautheron,
  • O.P. Gavrichtchouk,
  • S. Gerassimov,
  • J. Giarra,
  • I. Gnesi,
  • M. Gorzellik,
  • A. Grasso,
  • A. Gridin,
  • M. Grosse Perdekamp,
  • B. Grube,
  • T. Grussenmeyer,
  • A. Guskov,
  • D. Hahne,
  • G. Hamar,
  • D. von Harrach,
  • R. Heitz,
  • F. Herrmann,
  • N. Horikawa,
  • N. d'Hose,
  • C.-Y. Hsieh,
  • S. Huber,
  • S. Ishimoto,
  • A. Ivanov,
  • Yu. Ivanshin,
  • T. Iwata,
  • V. Jary,
  • R. Joosten,
  • P. Jörg,
  • K. Juraskova,
  • E. Kabuß,
  • A. Kerbizi,
  • B. Ketzer,
  • G.V. Khaustov,
  • Yu.A. Khokhlov,
  • Yu. Kisselev,
  • F. Klein,
  • J.H. Koivuniemi,
  • V.N. Kolosov,
  • K. Kondo,
  • I. Konorov,
  • V.F. Konstantinov,
  • A.M. Kotzinian,
  • O.M. Kouznetsov,
  • Z. Kral,
  • M. Krämer,
  • F. Krinner,
  • Z.V. Kroumchtein,
  • Y. Kulinich,
  • F. Kunne,
  • K. Kurek,
  • R.P. Kurjata,
  • I.I. Kuznetsov,
  • A. Kveton,
  • A.A. Lednev,
  • E.A. Levchenko,
  • M. Levillain,
  • S. Levorato,
  • Y.-S. Lian,
  • J. Lichtenstadt,
  • R. Longo,
  • V.E. Lyubovitskij,
  • A. Maggiora,
  • A. Magnon,
  • N. Makins,
  • N. Makke,
  • G.K. Mallot,
  • S.A. Mamon,
  • B. Marianski,
  • A. Martin,
  • J. Marzec,
  • J. Matoušek,
  • H. Matsuda,
  • T. Matsuda,
  • G.V. Meshcheryakov,
  • M. Meyer,
  • W. Meyer,
  • Yu.V. Mikhailov,
  • M. Mikhasenko,
  • E. Mitrofanov,
  • N. Mitrofanov,
  • Y. Miyachi,
  • A. Moretti,
  • A. Nagaytsev,
  • F. Nerling,
  • D. Neyret,
  • J. Nový,
  • W.-D. Nowak,
  • G. Nukazuka,
  • A.S. Nunes,
  • A.G. Olshevsky,
  • I. Orlov,
  • M. Ostrick,
  • D. Panzieri,
  • B. Parsamyan,
  • S. Paul,
  • J.-C. Peng,
  • F. Pereira,
  • M. Pešek,
  • M. Pešková,
  • D.V. Peshekhonov,
  • N. Pierre,
  • S. Platchkov,
  • J. Pochodzalla,
  • V.A. Polyakov,
  • J. Pretz,
  • M. Quaresma,
  • C. Quintans,
  • S. Ramos,
  • C. Regali,
  • G. Reicherz,
  • C. Riedl,
  • N.S. Rogacheva,
  • D.I. Ryabchikov,
  • A. Rybnikov,
  • A. Rychter,
  • R. Salac,
  • V.D. Samoylenko,
  • A. Sandacz,
  • C. Santos,
  • S. Sarkar,
  • I.A. Savin,
  • T. Sawada,
  • G. Sbrizzai,
  • P. Schiavon,
  • H. Schmieden,
  • K. Schönning,
  • E. Seder,
  • A. Selyunin,
  • L. Silva,
  • L. Sinha,
  • S. Sirtl,
  • M. Slunecka,
  • J. Smolik,
  • A. Srnka,
  • D. Steffen,
  • M. Stolarski,
  • O. Subrt,
  • M. Sulc,
  • H. Suzuki,
  • A. Szabelski,
  • T. Szameitat,
  • P. Sznajder,
  • M. Tasevsky,
  • S. Tessaro,
  • F. Tessarotto,
  • A. Thiel,
  • J. Tomsa,
  • F. Tosello,
  • V. Tskhay,
  • S. Uhl,
  • B.I. Vasilishin,
  • A. Vauth,
  • B.M. Veit,
  • J. Veloso,
  • A. Vidon,
  • M. Virius,
  • S. Wallner,
  • M. Wilfert,
  • J. ter Wolbeek,
  • K. Zaremba,
  • P. Zavada,
  • M. Zavertyaev,
  • E. Zemlyanichkina,
  • N. Zhuravlev,
  • M. Ziembicki

Journal volume & issue
Vol. 793
pp. 188 – 194

Abstract

Read online

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. Keywords: Quantum chromodynamics, Deep inelastic scattering, Exclusive reactions, Deeply virtual Compton scattering, Generalized Parton Distributions, Proton size, COMPASS