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Spin density matrix elements in exclusive ω meson muoproduction

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cris.lastimport.scopus2024-02-12T19:58:53Z
dc.abstract.en<p>We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive ω meson muoproduction on the proton at COMPASS using 160 GeV/c polarised μ<sup>+</sup> and μ<sup>-</sup> beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/c<sup>2</sup>< W< 17.0 GeV/c<sup>2</sup>, with the average kinematics ⟨ Q<sup>2</sup>⟩ = 2.1 (GeV/c)<sup>2</sup>, ⟨ W⟩ = 7.6 GeV/c<sup>2</sup>, and ⟨pT2⟩=0.16 (GeV/c)<sup>2</sup>. Here, Q<sup>2</sup> denotes the virtuality of the exchanged photon, W the mass of the final hadronic system and p<sub>T</sub> the transverse momentum of the ω meson with respect to the virtual-photon direction. The measured non-zero SDMEs for the transitions of transversely polarised virtual photons to longitudinally polarised vector mesons (γT∗→VL) indicate a violation of s-channel helicity conservation. Additionally, we observe a sizeable contribution of unnatural-parity-exchange (UPE) transitions that decreases with increasing W. The results provide important input for modelling Generalised Parton Distributions (GPDs). In particular, they may allow to evaluate in a model-dependent way the contribution of UPE transitions and assess the role of parton helicity-flip GPDs in exclusive ω production.</p>
dc.affiliationUniwersytet Warszawski
dc.contributor.authorBadełek, Barbara
dc.contributor.authorLevorato, S.
dc.contributor.authorLavickova, K.
dc.contributor.authorLichtenstadt, J.
dc.contributor.authorLian, Y.-S.
dc.contributor.authorKulinich, Y.
dc.contributor.authorKveton, A.
dc.contributor.authorKunne, F.
dc.contributor.authorLongo, R.
dc.contributor.authorLin, P.-J.
dc.contributor.authorLyubovitskij, V.E.
dc.contributor.authorJandek, M.
dc.contributor.authorIwata, T.
dc.contributor.authorJörg, P.
dc.contributor.authorJary, V.
dc.contributor.authorKabuß, E.
dc.contributor.authorJoosten, R.
dc.contributor.authorKhaustov, G.V.
dc.contributor.authorKetzer, B.
dc.contributor.authorKisselev, Yu.
dc.contributor.authorKhokhlov, Yu. A.
dc.contributor.authorKerbizi, A.
dc.contributor.authorKaspar, F.
dc.contributor.authorKolosov, V.N.
dc.contributor.authorKoivuniemi, J.H.
dc.contributor.authorKonorov, I.
dc.contributor.authorHorikawa, K. Kondo
dc.contributor.authorGiarra, J.
dc.contributor.authorGorzellik, M.
dc.contributor.authorGnesi, I.
dc.contributor.authorZhao, Y.
dc.contributor.authorZemko, M.
dc.contributor.authorZavada, P.
dc.contributor.authorWallner, S.
dc.contributor.authorWagner, Marcin
dc.contributor.authorGridin, A.
dc.contributor.authorGrasso, A.
dc.contributor.authorPerdekamp, M. Grosse
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dc.contributor.authorMeyer, W.
dc.contributor.authorMakke, N.
dc.contributor.authorMakins, N.
dc.contributor.authorMaltsev, A.
dc.contributor.authorMallot, G.K.
dc.contributor.authorMagnon, A.
dc.contributor.authorMaggiora, A.
dc.contributor.authorMattson, G.
dc.contributor.authorMatsuda, T.
dc.contributor.authorMeyer, M.E
dc.contributor.authorMeshcheryakov, G.V.
dc.contributor.authorMarianski, B.
dc.contributor.authorMamon, S.A.
dc.contributor.authorMatoušek, J.
dc.contributor.authorMartin, A. Gonzales
dc.contributor.authorKurjata, Robert
dc.contributor.authorKouznetsov, O.M.
dc.contributor.authorKotzinian, A.M.
dc.contributor.authorKral, Z.
dc.contributor.authorKoval, Anton
dc.contributor.authorKonstantinov, V.F
dc.contributor.authorKrinner, F.
dc.contributor.authorChung, S.-U.
dc.contributor.authorCorreia, P.M.M.
dc.contributor.authorCicuttin, A.
dc.contributor.authorDenisov, O. Yu.
dc.contributor.authorPlatchkov, S.
dc.contributor.authorDenisenko, I.
dc.contributor.authorPierre, N.
dc.contributor.authorDonskov, S.V.
dc.contributor.authorD’Ago, D.
dc.contributor.authorPešek, M.
dc.contributor.authorCrespo, M.L.
dc.contributor.authorPeng, Jialiang
dc.contributor.authorDasgupta, Soura
dc.contributor.authorPešková, M.
dc.contributor.authorTorre, S.D. De la
dc.contributor.authorPeshekhonov, D.V.
dc.contributor.authorPolyakov, V.A.
dc.contributor.authorPochodzalla, J.
dc.contributor.authorRiedl, C.
dc.contributor.authorReicherz, G.
dc.contributor.authorSamoylenko, V.D.
dc.contributor.authorRyabchikov, D.I.
dc.contributor.authorQuaresma, M.
dc.contributor.authorPretz, J.
dc.contributor.authorRegali, C.
dc.contributor.authorQuintans, C.
dc.contributor.authorAzevedo, C.D.R.
dc.contributor.authorPekeler, H.
dc.contributor.authorBernhard, J.
dc.contributor.authorMoretti, A.
dc.contributor.authorAntequera, J. Berenguer
dc.contributor.authorMiyachi, Y.
dc.contributor.authorBradamante, F.
dc.contributor.authorBodlak, M.
dc.contributor.authorNaim, C.
dc.contributor.authorBall, M.
dc.contributor.authorMikhasenko, M.
dc.contributor.authorBalestra, Francis
dc.contributor.authorBedfer, Y.
dc.contributor.authorMitrofanov, N.
dc.contributor.authorBeck, Christine R.
dc.contributor.authorMitrofanov, E.
dc.contributor.authorNeyret, D.
dc.contributor.authorPanzieri, D.
dc.contributor.authorOstrick, M.
dc.contributor.authorPaul, S.
dc.contributor.authorParsamyan, B.
dc.contributor.authorNukazuka, G.
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dc.contributor.authorOlshevsky, A.G.
dc.contributor.authorNunes, A.S.
dc.contributor.authorHeitz, R.
dc.contributor.authorAugustyniak, W.
dc.contributor.authorHarrach, D. von
dc.contributor.authorHorikawa, N.
dc.contributor.authorUhl, S.
dc.contributor.authorHerrmann, F.
dc.contributor.authorTskhay, V.
dc.contributor.authorAlexeev, M.G.
dc.contributor.authorZiembicki, Marcin
dc.contributor.authorAugsten, K.
dc.contributor.authorGrube, B.
dc.contributor.authorAntoshkin, A.
dc.contributor.authorIvanov, A.
dc.contributor.authorHsieh, C.-Y.
dc.contributor.authorVauth, A.
dc.contributor.authord’Hose, N.
dc.contributor.authorVasilishin, B.I.
dc.contributor.authorIshimoto, S.
dc.contributor.authorVeloso, J.
dc.contributor.authorHuber, S.
dc.contributor.authorVeit, B.M.
dc.contributor.authorVidon, A.
dc.contributor.authorVentura, B.
dc.contributor.authorDreisbach, Ch.
dc.contributor.authorDoshita, N.
dc.contributor.authorVirius, M.
dc.contributor.authorZaremba, Krzysztof
dc.contributor.authorDusaev, R.R.
dc.contributor.authorDünnweber, W.
dc.contributor.authorEversheim, P.D.
dc.contributor.authorEfremov, A.
dc.contributor.authorFaessler, M.
dc.contributor.authorFaccioli, P.
dc.contributor.authorFinger, M.
dc.contributor.authorSandacz, Andrzej Maciej
dc.contributor.authorFerrero, A.
dc.contributor.authorGerassimov, S.
dc.contributor.authorGavrichtchouk, O.P.
dc.contributor.authorSinha, L.
dc.contributor.authorFranco, C.
dc.contributor.authorSavin, I.A.
dc.contributor.authorFischer, H.
dc.contributor.authorSarkar, Md. Shahjahan K. A.
dc.contributor.authorGautheron, F.
dc.contributor.authorSchmieden, H.
dc.contributor.authorFriedrich, J.M.
dc.contributor.authorSbrizzai, G.
dc.contributor.authorRychter, Andrzej
dc.contributor.authorSteffen, D.
dc.contributor.authorRudnicki, T.
dc.contributor.authorStolarski, M.
dc.contributor.authorBressan, A.
dc.contributor.authorSulc, M.
dc.contributor.authorSmolik, J.
dc.contributor.authorSubrt, O.
dc.contributor.authorKurek, K
dc.contributor.authorAlexeev, G.D
dc.contributor.authorNowak, W.-D.
dc.contributor.authorMarzec, Janusz
dc.contributor.authorTosello, F.
dc.contributor.authorChumakov, A.G.
dc.contributor.authorTomsa, J.
dc.contributor.authorTownsend, A.
dc.contributor.authorChang, W.-
dc.contributor.authorSzameitat, T.
dc.contributor.authorBurtsev, V.E.
dc.contributor.authorSuzuki, H.
dc.contributor.authorChiosso, M.
dc.contributor.authorThiel, A.
dc.contributor.authorChatterjee, C.
dc.contributor.authorSznajder, Piotr
dc.date.accessioned2024-01-26T07:56:58Z
dc.date.available2024-01-26T07:56:58Z
dc.date.issued2021
dc.description.financePublikacja bezkosztowa
dc.description.volume81
dc.identifier.doi10.1140/EPJC/S10052-020-08740-Y
dc.identifier.issn1434-6044
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/120388
dc.languageeng
dc.pbn.affiliationphysical sciences
dc.relation.ispartofEuropean Physical Journal C
dc.relation.pages1-22
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleSpin density matrix elements in exclusive ω meson muoproduction
dc.typeJournalArticle
dspace.entity.typePublication