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Measurement of Single and Double Spin Asymmetries in Deep Inelastic Pion Electroproduction with a Longitudinally Polarized Target

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arxiv 1003.4549 v1 pith:6L7X5Q6D submitted 2010-03-23 hep-ex nucl-ex

Measurement of Single and Double Spin Asymmetries in Deep Inelastic Pion Electroproduction with a Longitudinally Polarized Target

The CLAS Collaboration: H.Avakian , P.Bosted , V.D.Burkert , L.Elouadrhiri , K. P. Adhikari , M.Aghasyan , M.Amaryan , M.Anghinolfi
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H.Baghdasaryan J.Ball M.Battaglieri I.Bedlinskiy A.S.Biselli D.Branford W.J.Briscoe W.Brooks D.S.Carman L.Casey P.L.Cole P.Collins D.Crabb V.Crede A.D'Angelo A.Daniel N.Dashyan R.DeVita E.DeSanctis A.Deur B.Dey S.Dhamija R.Dickson C.Djalali G.Dodge D.Doughty R.Dupre A.ElAlaoui P.Eugenio S.Fegan R.Fersch T.A.Forest A.Fradi M.Y.Gabrielyan G.Gavalian N.Gevorgyan G.P.Gilfoyle K.L.Giovanetti F.X.Girod W.Gohn R.W.Gothe K.A.Griffioen M.Guidal N.Guler L.Guo K.Hafidi H.Hakobyan C.Hanretty N.Hassall D.Heddle K.Hicks M.Holtrop Y.Ilieva D.G.Ireland E.L.Isupov S.S.Jawalkar H.S.Jo K.Joo D.Keller M.Khandaker P.Khetarpal W.Kim A.Klein F.J.Klein P.Konczykowski V.Kubarovsky S.E.Kuhn S.V.Kuleshov V.Kuznetsov K.Livingston H.Y.Lu N.Markov M.Mayer J.McAndrew M.E.McCracken B.McKinnon C.A.Meyer T.Mineeva M.Mirazita V.Mokeev B.Moreno K.Moriya B.Morrison H.Moutarde E.Munevar P.Nadel-Turonski R.Nasseripour S. Niccolai G. Niculescu I. Niculescu M.R. Niroula M. Osipenko A.I. Ostrovidov R. Paremuzyan K. Park S. Park E. Pasyuk S. Anefalos Pereira Y. Perrin S. Pisano O. Pogorelko J.W. Price S. Procureur Y. Prok D. Protopopescu B.A. Raue G. Ricco M. Ripani G. Rosner P. Rossi F. Sabati\'e M.S. Saini J. Salamanca C. Salgado R.A. Schumacher E. Seder H. Seraydaryan Y.G. Sharabian D.I. Sober D. Sokhan S.S. Stepanyan S. Stepanyan P. Stoler S. Strauch R. Suleiman M. Taiuti D.J. Tedeschi S. Tkachenko M. Ungaro B .Vernarsky M.F. Vineyard E. Voutier D.P. Watts L.B. Weinstein D.P. Weygand M.H. Wood J. Zhang B. Zhao Z.W. Zhao
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classification hep-ex nucl-ex
keywords polarizedspinasymmetrieslongitudinallysinglebeendeepdouble
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report the first measurement of the transverse momentum dependence of double spin asymmetries in semi-inclusive production of pions in deep inelastic scattering off the longitudinally polarized proton. Data have been obtained using a polarized electron beam of 5.7 GeV with the CLAS detector at the Thomas Jefferson National Accelerator Facility (JLab). A significant non-zero $\sin2\phi$ single spin asymmetry was also observed for the first time indicating strong spin-orbit correlations for transversely polarized quarks in the longitudinally polarized proton. The azimuthal modulations of single spin asymmetries have been measured over a wide kinematic range.

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