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Measurement of the cross section for hard exclusive π0 muoproduction on the proton

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cris.lastimport.scopus2024-02-12T19:29:29Z
dc.abstract.enWe report on a measurement of hard exclusive pi(0) muoproduction on the proton by COMPASS using 160GeV/cpolarised mu+ and mu- beams of the CERN SPS impinging on a liquid hydrogen target. From the average of the measured mu+ and mu- cross sections, the virtual-photon proton cross section is determined as a function of the squared four-momentum transfer between initial and final proton in the range 0.08 (GeV/c)(2) <vertical bar t vertical bar < 0.64 (GeV/c)(2). The average kinematics of the measurement are Q(2) = 2.0 (GeV/c)(2), nu = 12.8 GeV, x(Bj) = 0.093and -t = 0.256 (GeV/c)(2). Fitting the azimuthal dependence reveals a combined contribution by transversely and longitudinally polarised photons of (8.2 +/- 0.9(stat-1.2)(+1.2)vertical bar(sys)) nb/(GeV/c)(2), as well as transverse-transverse and longitudinal-transverse interference contributions of (-6.1 +/- 1.3(stat- 0.7)(+0.7) vertical bar sys) nb/(GeV/c)(2) and (1.5 +/- 0.5(stat-0.2)(+ 0.3) vertical bar(sys)) nb/(GeV/c)(2), respectively. Our results provide important input for modelling Generalised Parton Distributions. In the context of the phenomenological Goloskokov-Kroll model, the statistically significant transversetransverse interference contribution constitutes clear experimental evidence for the chiral-odd GPD ET. (C) 2020 The Author(s). Published by Elsevier B.V.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorBadełek, Barbara
dc.contributor.authorAnosov, V.
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dc.contributor.authorChatterjee, C.
dc.contributor.authorChang, W.-C.
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dc.contributor.authorBüchele, M.
dc.contributor.authorBressan, A.
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dc.contributor.authorSzabelski, A.
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dc.contributor.authorBedfer, Y.
dc.contributor.authorSilva, L.
dc.contributor.authorBeck, R.
dc.contributor.authorSelyunin, A.
dc.contributor.authorBarth, J.
dc.contributor.authorSchmieden, H.
dc.contributor.authorBall, M.
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dc.contributor.authorBalestra, F.
dc.contributor.authorSavin, I.A.
dc.contributor.authorBradamante, F.
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dc.contributor.authorBodlak, M.
dc.contributor.authorBernhard, J.
dc.contributor.authorSinha, L.
dc.contributor.authorSarkar, S.
dc.contributor.authorSandacz, A.
dc.contributor.authorSamoylenko, V.D.
dc.contributor.authorRychter, A.
dc.contributor.authorPretz, J.
dc.contributor.authorPolyakov, V.A.
dc.contributor.authorPochodzalla, J.
dc.contributor.authorPlatchkov, S.
dc.contributor.authorQuintans, C.
dc.contributor.authorQuaresma, M.
dc.contributor.authorSulc, M.
dc.contributor.authorSubrt, O.
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dc.date.accessioned2024-01-25T08:53:23Z
dc.date.available2024-01-25T08:53:23Z
dc.date.issued2020
dc.description.financePublikacja bezkosztowa
dc.description.number135454
dc.description.volume805
dc.identifier.doi10.1016/J.PHYSLETB.2020.135454
dc.identifier.issn0370-2693
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/112093
dc.identifier.weblinkhttps://api.elsevier.com/content/article/PII:S0370269320302586?httpAccept=text/xml
dc.languageeng
dc.pbn.affiliationphysical sciences
dc.relation.ispartofPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleMeasurement of the cross section for hard exclusive π0 muoproduction on the proton
dc.typeJournalArticle
dspace.entity.typePublication