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Transverse extension of partons in the proton probed in the sea-quark range by measuring the DVCS cross section
Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
Univ Turin, Dept Phys, I-10125 Turin, Italy.
Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
Univ Turin, Dept Phys, I-10125 Turin, Italy;Ist Nazl Fis Nucl, Torino Sect, I-10125 Turin, Italy.
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2019 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 793, p. 188-194Article in journal (Refereed) Published
Abstract [en]

We report on the first measurement of exclusive single-photon muoproduction on the proton by COMPASS using 160 GeV/c polarised mu(+) and mu(-) beams of the CERN SPS impinging on a liquid hydrogen target. We determine the dependence of the average of the measured mu(+) and mu(-) 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 +/- 0.6(stat) (+0.1)(-0.3)vertical bar(sys)) (GeV/c)(-2). This result can be converted into a transverse extension of partons in the proton,root(r(perpendicular to)(2)) = (0.58 +/- 0.04(stat) (+0.01)(-0.02)vertical bar(sys) +/- 0.04(model)) fm. For this measurement, the average virtuality of the photon mediating the interaction is < Q(2)> = 1.8 (GeV/c)(2) and the average value of the Bjorken variable is < X-Bj > = 0.056.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2019. Vol. 793, p. 188-194
Keywords [en]
Quantum chromodynamics, Deep inelastic scattering, Exclusive reactions, Deeply virtual Compton scattering, Generalized Parton Distributions, Proton size, COMPASS
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-387722DOI: 10.1016/j.physletb.2019.04.038ISI: 000470064800031OAI: oai:DiVA.org:uu-387722DiVA, id: diva2:1330725
Available from: 2019-06-26 Created: 2019-06-26 Last updated: 2019-06-26Bibliographically approved

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