Transverse extension of partons in the proton probed in the sea-quark range by measuring the DVCS cross section; Physics Letters B; Vol. 793

Transverse extension of partons in the proton probed in the sea-quark range by measuring the DVCS cross section; Physics Letters B; Vol. 793

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Parent link:Physics Letters B
Vol. 793.— 2019.— [P. 188-194]
Tác giả của công ty: Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов
Tác giả khác: Akhunzyanov R. R. Ruslan Rustyamovich, Alekseev M. G. Maksim, Burtsev V. E. Vitaly Evgenjevich, Chumakov A. G. Aleksandr Grigorjevich, Dusaev R. R. Renat Ramilyevich, Levchenko E. A. Evgeny Anatolievich, Lyubovitskiy (Lyubovitskij) V. E. Valery Efimovich, Mamon S. A. Sergey Aleksandrovich, Vasilishin B. I. Bogdan Ivanovich
Tóm tắt:Title screen
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.
Ngôn ngữ:Tiếng Anh
Được phát hành: 2019
Những chủ đề:
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
Truy cập trực tuyến:https://doi.org/10.1016/j.physletb.2019.04.038
Định dạng: Điện tử Chương của sách
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=661239
Miêu tả
Tóm tắt:Title screen
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.
DOI:10.1016/j.physletb.2019.04.038

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