A measurement of the Q 2 , W and t dependences of deeply virtual Compton scattering at HERAстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Deeply virtual Compton scattering, γ* p → γ p , has been measured in e + p collisions at HERA with the ZEUS detector using an integrated luminosity of 61.1 pb −1 . Cross sections are presented as a function of the photon virtuality, Q 2 , and photon-proton centre-of-mass energy, W , for a wide region of the phase space, Q 2 > 1.5 GeV 2 and 40 < W < 170 GeV. A subsample of events in which the scattered proton is measured in the leading proton spectrometer, corresponding to an integrated luminosity of 31.3 pb −1 , is used for the first direct measurement of the differential cross section as a function of t , where t is the square of the four-momentum transfer at the proton vertex.