000030165 001__ 30165
000030165 005__ 20140130020650.0
000030165 037__ $$9arXiv$$aarXiv:0906.5160$$chep-ex
000030165 035__ $$9arXiv$$zoai:arXiv.org:0906.5160
000030165 037__ $$aDESY-09-094
000030165 035__ $$9DESY$$zD09-09418
000030165 035__ $$9SPIRESTeX$$z:2009uta
000030165 100__ $$aAirapetian, A.$$uMichigan U.$$uGiessen U.
000030165 245__ $$aExclusive rho0 electroproduction on transversely polarized protons
000030165 246__ $$9arXiv$$aExclusive rho-0 electroproduction on transversely polarized protons
000030165 269__ $$c2009-06
000030165 300__ $$a7
000030165 520__ $$9arXiv$$aThe exclusive electroproduction of rho-0 mesons was studied with the HERMES spectrometer at the DESY laboratory by scattering 27.6 GeV positron and electron beams off a transversely polarized hydrogen target. Spin density matrix elements for this process were determined from the measured production- and decay-angle distributions of the produced rho-0 mesons. These matrix elements embody information on helicity transfer and the validity of s-channel helicity conservation in the case of a transversely polarized target. From the spin density matrix elements, the leading-twist term in the single-spin asymmetry was calculated separately for longitudinally and transversely polarized rho-0 mesons. Neglecting s-channel helicity changing matrix elements, results for the former can be compared to calculations based on generalized parton distributions, which are sensitive to the contribution of the total angular momentum of the quarks to the proton spin.
000030165 65017 $$2INSPIRE$$aExperiment-HEP
000030165 6507_ $$2PACS$$a13.60.Le
000030165 6507_ $$2PACS$$a13.88.+e
000030165 6507_ $$2PACS$$a14.20.Dh
000030165 6507_ $$2PACS$$a14.40.Aq
000030165 6507_ $$2PACS$$a12.38.Qk
000030165 690C_ $$2INSPIRE$$aPublished
000030165 693__ $$eDESY-HERA-HERMES
000030165 695__ $$2INSPIRE$$aelectron p: exclusive reaction
000030165 695__ $$2INSPIRE$$aspin: density matrix
000030165 695__ $$2INSPIRE$$ahelicity: conservation law
000030165 695__ $$2INSPIRE$$ap: spin
000030165 695__ $$2INSPIRE$$aquark: angular momentum
000030165 695__ $$2INSPIRE$$ahydrogen: polarized target: transverse
000030165 695__ $$2INSPIRE$$aparton: distribution function
000030165 695__ $$2INSPIRE$$arho(770): electroproduction
000030165 695__ $$2INSPIRE$$arho(770)0: polarization
000030165 695__ $$2INSPIRE$$ageneralized parton distribution
000030165 695__ $$2INSPIRE$$aangular distribution
000030165 695__ $$2INSPIRE$$aspin: asymmetry
000030165 695__ $$2INSPIRE$$aHERMES: experimental results
000030165 695__ $$2INSPIRE$$aDESY HERA Stor
000030165 695__ $$2INSPIRE$$aelectron p --> p rho(770)0 electron
000030165 695__ $$2INSPIRE$$arho(770)0 --> pi+ pi-
000030165 695__ $$2INSPIRE$$a27.6 GeV
000030165 700__ $$aAkopov, N.$$uYerevan Phys. Inst.
000030165 700__ $$aAkopov, Z.$$uYerevan Phys. Inst.
000030165 700__ $$aAschenauer, E.C.$$uDESY, Zeuthen
000030165 700__ $$aAugustyniak, W.$$uWarsaw, Inst. Nucl. Studies
000030165 700__ $$aAvetissian, A.$$uYerevan Phys. Inst.
000030165 700__ $$aAvetisyan, E.$$uDESY
000030165 700__ $$aBall, B.$$uMichigan U.
000030165 700__ $$aBianchi, N.$$uFrascati
000030165 700__ $$aBlok, H.P.$$uVrije U., Amsterdam$$uNIKHEF, Amsterdam
000030165 700__ $$aBottcher, H.$$uDESY, Zeuthen
000030165 700__ $$aBonomo, C.$$uFerrara U.$$uINFN, Ferrara
000030165 700__ $$aBorissov, A.$$uDESY
000030165 700__ $$aBryzgalov, V.$$uSerpukhov, IHEP
000030165 700__ $$aBurns, J.$$uGlasgow U.
000030165 700__ $$aCapiluppi, M.$$uFerrara U.$$uINFN, Ferrara
000030165 700__ $$aCapitani, G.P.$$uFrascati
000030165 700__ $$aCisbani, E.$$uRome, ISS$$uINFN, Rome
000030165 700__ $$aCiullo, G.$$uFerrara U.$$uINFN, Ferrara
000030165 700__ $$aContalbrigo, M.$$uFerrara U.$$uINFN, Ferrara
000030165 700__ $$aDalpiaz, P.F.$$uFerrara U.$$uINFN, Ferrara
000030165 700__ $$aDeconinck, W.$$uMichigan U.$$uDESY
000030165 700__ $$aDe Leo, R.$$uINFN, Bari
000030165 700__ $$aDe Nardo, L.$$uMichigan U.$$uDESY
000030165 700__ $$aDe Sanctis, E.$$uFrascati
000030165 700__ $$aDiefenthaler, M.$$uErlangen - Nuremberg U.$$uIllinois U., Urbana
000030165 700__ $$aDi Nezza, P.$$uFrascati
000030165 700__ $$aDreschler, J.$$uNIKHEF, Amsterdam
000030165 700__ $$aDuren, M.$$uGiessen U.
000030165 700__ $$aEhrenfried, M.$$uGiessen U.
000030165 700__ $$aElbakian, G.$$uYerevan Phys. Inst.
000030165 700__ $$aEllinghaus, F.$$uColorado U.
000030165 700__ $$aFabbri, R.$$uDESY, Zeuthen
000030165 700__ $$aFantoni, A.$$uFrascati
000030165 700__ $$aFellawka, L.$$uTRIUMF
000030165 700__ $$aFrullani, S.$$uRome, ISS$$uINFN, Rome
000030165 700__ $$aGabbert, D.$$uDESY, Zeuthen
000030165 700__ $$aGapienko, G.$$uSerpukhov, IHEP
000030165 700__ $$aGapienko, V.$$uSerpukhov, IHEP
000030165 700__ $$aGharibyan, V.$$uYerevan Phys. Inst.
000030165 700__ $$aGiordano, F.$$uFerrara U.$$uINFN, Ferrara$$uDESY
000030165 700__ $$aGliske, S.$$uMichigan U.
000030165 700__ $$aHadjidakis, C.$$uFrascati
000030165 700__ $$aHartig, M.$$uDESY
000030165 700__ $$aHasch, D.$$uFrascati
000030165 700__ $$aHill, G.$$uGlasgow U.
000030165 700__ $$aHillenbrand, A.$$uDESY, Zeuthen
000030165 700__ $$aHoek, M.$$uGlasgow U.
000030165 700__ $$aHoller, Y.$$uDESY
000030165 700__ $$aHristova, I.$$uDESY, Zeuthen
000030165 700__ $$aImazu, Y.$$uTokyo Inst. Tech.
000030165 700__ $$aIvanilov, A.$$uSerpukhov, IHEP
000030165 700__ $$aJackson, H.E.$$uArgonne
000030165 700__ $$aJo, H.S.$$uGent U.
000030165 700__ $$aJoosten, S.$$uGent U.$$uIllinois U., Urbana
000030165 700__ $$aKaiser, R.$$uGlasgow U.
000030165 700__ $$aKeri, T.$$uGiessen U.$$uGlasgow U.
000030165 700__ $$aKinney, E.$$uColorado U.
000030165 700__ $$aKisselev, A.$$uSt. Petersburg, INP
000030165 700__ $$aKobayashi, N.$$uTokyo Inst. Tech.
000030165 700__ $$aKorotkov, V.$$uSerpukhov, IHEP
000030165 700__ $$aKravchenko, P.$$uSt. Petersburg, INP
000030165 700__ $$aLagamba, L.$$uINFN, Bari
000030165 700__ $$aLamb, R.$$uIllinois U., Urbana
000030165 700__ $$aLapikas, L.$$uNIKHEF, Amsterdam
000030165 700__ $$aLehmann, I.$$uGlasgow U.
000030165 700__ $$aLenisa, P.$$uFerrara U.$$uINFN, Ferrara
000030165 700__ $$aLinden-Levy, L.A.$$uIllinois U., Urbana
000030165 700__ $$aLopez Ruiz, A.$$uGent U.
000030165 700__ $$aLorenzon, W.$$uMichigan U.
000030165 700__ $$aLu, X.-G.$$uDESY, Zeuthen
000030165 700__ $$aLu, X.-R.$$uTokyo Inst. Tech.
000030165 700__ $$aMa, B.-Q.$$uPeking U.
000030165 700__ $$aMahon, D.$$uGlasgow U.
000030165 700__ $$aMakins, N.C.R.$$uIllinois U., Urbana
000030165 700__ $$aManaenkov, S.I.$$uSt. Petersburg, INP
000030165 700__ $$aManfre, L.$$uRome, ISS$$uINFN, Rome
000030165 700__ $$aMao, Y.$$uPeking U.
000030165 700__ $$aMarianski, B.$$uWarsaw, Inst. Nucl. Studies
000030165 700__ $$aMartinez de la Ossa, A.$$uColorado U.
000030165 700__ $$aMarukyan, H.$$uYerevan Phys. Inst.
000030165 700__ $$aMiller, C.A.$$uTRIUMF
000030165 700__ $$aMiyachi, Y.$$uTokyo Inst. Tech.
000030165 700__ $$aMovsisyan, A.$$uYerevan Phys. Inst.
000030165 700__ $$aMuccifora, V.$$uFrascati
000030165 700__ $$aMurray, M.$$uGlasgow U.
000030165 700__ $$aMussgiller, A.$$uErlangen - Nuremberg U.$$uDESY
000030165 700__ $$aNappi, E.$$uINFN, Bari
000030165 700__ $$aNaryshkin, Y.$$uSt. Petersburg, INP
000030165 700__ $$aNass, A.$$uErlangen - Nuremberg U.
000030165 700__ $$aNowak, W.-D.$$uDESY, Zeuthen
000030165 700__ $$aPappalardo, L.L.$$uFerrara U.$$uINFN, Ferrara
000030165 700__ $$aPerez-Benito, R.$$uGiessen U.
000030165 700__ $$aReimer, P.E.$$uArgonne
000030165 700__ $$aReolon, A.R.$$uFrascati
000030165 700__ $$aRiedl, C.$$uDESY, Zeuthen
000030165 700__ $$aRith, K.$$uErlangen - Nuremberg U.
000030165 700__ $$aRosner, G.$$uGlasgow U.
000030165 700__ $$aRostomyan, A.$$uDESY
000030165 700__ $$aRubin, J.$$uIllinois U., Urbana
000030165 700__ $$aRyckbosch, D.$$uGent U.
000030165 700__ $$aSalomatin, Y.$$uSerpukhov, IHEP
000030165 700__ $$aSanftl, F.$$uRegensburg U.
000030165 700__ $$aSchafer, A.$$uRegensburg U.
000030165 700__ $$aSchnell, G.$$uGent U.$$uDESY, Zeuthen
000030165 700__ $$aSchuler, K.P.$$uDESY
000030165 700__ $$aSeitz, B.$$uGlasgow U.
000030165 700__ $$aShibata, T.-A.$$uTokyo Inst. Tech.
000030165 700__ $$aShutov, V.$$uDubna, JINR
000030165 700__ $$aStancari, M.$$uFerrara U.$$uINFN, Ferrara
000030165 700__ $$aStatera, M.$$uFerrara U.$$uINFN, Ferrara
000030165 700__ $$aSteffens, E.$$uErlangen - Nuremberg U.
000030165 700__ $$aSteijger, J.J.M.$$uNIKHEF, Amsterdam
000030165 700__ $$aStenzel, H.$$uGiessen U.
000030165 700__ $$aStewart, J.$$uDESY, Zeuthen
000030165 700__ $$aStinzing, F.$$uErlangen - Nuremberg U.
000030165 700__ $$aTaroian, S.$$uYerevan Phys. Inst.
000030165 700__ $$aTerkulov, A.$$uLebedev Inst.
000030165 700__ $$aTrzcinski, A.$$uWarsaw, Inst. Nucl. Studies
000030165 700__ $$aTytgat, M.$$uGent U.
000030165 700__ $$aVandenbroucke, A.$$uGent U.
000030165 700__ $$avan der Nat, P.B.$$uNIKHEF, Amsterdam
000030165 700__ $$aVan Haarlem, Y.$$uGent U.
000030165 700__ $$aVan Hulse, C.$$uGent U.
000030165 700__ $$aVaranda, M.$$uDESY
000030165 700__ $$aVeretennikov, D.$$uSt. Petersburg, INP
000030165 700__ $$aVikhrov, V.$$uSt. Petersburg, INP
000030165 700__ $$aVilardi, I.$$uINFN, Bari
000030165 700__ $$aVogel, C.$$uErlangen - Nuremberg U.
000030165 700__ $$aWang, S.$$uPeking U.
000030165 700__ $$aYaschenko, S.$$uErlangen - Nuremberg U.$$uDESY, Zeuthen
000030165 700__ $$aYe, H.$$uPeking U.
000030165 700__ $$aYe, Z.$$uDESY
000030165 700__ $$aYen, S.$$uTRIUMF
000030165 700__ $$aYu, W.$$uGiessen U.
000030165 700__ $$aZeiler, D.$$uErlangen - Nuremberg U.
000030165 700__ $$aZihlmann, B.$$uDESY
000030165 700__ $$aZupranski, P.$$uWarsaw, Inst. Nucl. Studies
000030165 710__ $$gHERMES Collaboration
000030165 773__ $$a10.1016/j.physletb.2009.07.023$$c100-105$$pPhys.Lett.$$vB679$$y2009
000030165 8564_ $$uhttp://inspirebeta.net/record/824279/files/asym_final_TMC2.png$$y00004 The extracted amplitudes of the $\sin(\phi-\phi_S)$ component of $A_{UT}$ for longitudinally (top) and transversely polarized (bottom) $\rho^0$ mesons. The inner error bars represent the statistical uncertainties. The full error bars represent the quadratic sum of the statistical and systematic uncertainties. In addition there is an overall scale uncertainty of 8.1\% from the uncertainty in the target polarization.
000030165 8564_ $$uhttp://inspirebeta.net/record/824279/files/azangles3.png$$y00000 The lepton scattering and hadron production planestogether with the azimuthal angles $\phi$ and $\phi_S$.
000030165 8564_ $$uhttp://inspirebeta.net/record/824279/files/de_paper.png$$y00002 The $\Delta E$ distributions of the measured yield (number of counts within the acceptance divided by the integrated luminosity) (dots) and a Monte Carlo simulation with \pythia6\ of the non-exclusive background normalized to the same integrated luminosity (histogram). The kinematic cuts and the requirements $0.6$ GeV $< M_{\pi\pi} < 1.0$ GeV and $M_{KK} > 1.04$ GeV were applied. The selected exclusive region is indicated by the dashed area.
000030165 8564_ $$uhttp://inspirebeta.net/record/824279/files/decay-rest_1.png$$y00001 The polar and azimuthal angles of the decay $\pi^+$ of the $\rho^0$ in the $\rho^0$ rest frame. The positive $z$-axis is taken opposite to the direction of the residual proton, while the angle $\varphi$ is definedwith respect to the hadron production plane.
000030165 8564_ $$uhttp://inspirebeta.net/record/824279/files/sdme_UT_final.png$$y00003 Values of SDMEs, or combinations thereof, for a transversely polarized proton target and an unpolarized beam. The SDMEs are sorted into three categories, which are separated from each other by the solid horizontal lines. From top to bottom: SDMEs containing $s$-channel helicity-conserving amplitudes, combinations containing at least one $s$-channel helicity-changing amplitude, and SDMEs containing two $s$-channel helicity-changing amplitudes. Within the second category the combinations are sorted into three groups associated with different virtual photon and $\rho^0$ polarizations. The inner error bars represent the statistical uncertainties. The full error bars represent the quadratic sum of the statistical and systematic uncertainties. In addition there is an overall scale uncertainty of 8.1\% due to the uncertainty in the target polarization.
000030165 909CO $$ooai:jdsweb.jinr.ru:30165$$pglobal
000030165 961__ $$x2009-06-29
000030165 961__ $$c2009-12-16
000030165 970__ $$aSPIRES-8321949
000030165 980__ $$aPublished
000030165 980__ $$aArxiv
000030165 980__ $$aCiteable
000030165 980__ $$aCORE
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