Transverse extension of partons in the proton probed in the sea-quark range by measuring the DVCS cross section; Physics Letters B; Vol. 793
| Parent link: | Physics Letters B Vol. 793.— 2019.— [P. 188-194] |
|---|---|
| Співавтор: | |
| Інші автори: | , , , , , , , , |
| Резюме: | 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. |
| Мова: | Англійська |
| Опубліковано: |
2019
|
| Предмети: | |
| Онлайн доступ: | https://doi.org/10.1016/j.physletb.2019.04.038 |
| Формат: | Електронний ресурс Частина з книги |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=661239 |