Transverse extension of partons in the proton probed in the sea-quark range by measuring the DVCS cross section / R. R. Akhunzyanov [et al.]

Уровень набора: Physics Letters BАльтернативный автор-лицо: Akhunzyanov, R. R., Ruslan Rustyamovich;Alekseev, M. G., Maksim;Burtsev, V. E., mathematician, Senior Lecturer of Tomsk Polytechnic University, 1991-, Vitaly Evgenjevich;Chumakov, A. G., physicist, laboratory assistant-researcher of Tomsk Polytechnic University, 1992-, Aleksandr Grigorjevich;Dusaev, R. R., specialist in the field of nuclear physics, Engineer of Tomsk Polytechnic University, 1988-, Renat Ramilyevich;Levchenko, E. A., mathematician, technician, Senior Lecturer of Tomsk Polytechnic University, candidate of physico-mathematical Sciences, 1988-, Evgeny Anatolievich;Lyubovitskiy (Lyubovitskij), V. E., physicist, Professor of Tomsk Polytechnic University, Doctor of physical and mathematical sciences, Professor of the University of Tubingen (Germany), 1963-, Valery Efimovich;Mamon, S. A., physicist, laboratory assistant-researcher of Tomsk Polytechnic University, 1989-, Sergey Aleksandrovich;Vasilishin, B. I., engineer-physicist, laboratory researcher at Tomsk Polytechnic University, 1990-, Bogdan IvanovichКоллективный автор (вторичный): Национальный исследовательский Томский политехнический университет, Исследовательская школа физики высокоэнергетических процессов, (2017- )Язык: английский.Резюме или реферат: We report on the first measurement of exclusive single-photon muoproduction on the proton by COMPASS using 160 GeV/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..Примечания о наличии в документе библиографии/указателя: [References.: 38 tit.].Тематика: электронный ресурс | труды учёных ТПУ | quantum chromodynamics | deep inelastic scattering | exclusive reactions | deeply virtual compton scattering | generalized parton distributions | proton size | COMPASS | квантовая хромодинамика | глубоконеупругое рассеяние | эксклюзивные компетенции | рассеяние Ресурсы он-лайн:Щелкните здесь для доступа в онлайн
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[References.: 38 tit.]

We report on the first measurement of exclusive single-photon muoproduction on the proton by COMPASS using 160 GeV/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.

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