Spin density matrix elements in exclusive $$\omega $$ electroproduction on $$^1$$H and $$^2$$H targets at 27.5 GeV beam energy

A. Airapetian,N. Akopov, Z. Akopov,W. Augustyniak,A. Avetissian,H. P. Blok,Alexander Borissov,V. Bryzgalov,M. Capiluppi,G. P. Capitani,E. Cisbani,G. Ciullo,M. Contalbrigo,P. F. Dalpiaz,Wouter Deconinck,R. De Leo,E. De Sanctis,M. Diefenthaler,P. Di Nezza,Michael Düren,M. Ehrenfried,G. Elbakian,Frank Ellinghaus,E. Etzelmüller,Riccardo Fabbri,L. Felawka,S. Frullani,D. Gabbert,G. Gapienko,V. A. Gapienko,F. Garibaldi,G. Gavrilov,V. Gharibyan,M. Hartig,D. Hasch,Y. Holler,Ivana Hristova,A. Ivanilov,H. E. Jackson,S. Joosten,Ralf Kaiser, G. Karyan,T. Keri, E. R. Kinney,A. Kisselev,V. A. Korotkov,V. A. Kozlov,P. Kravchenko,V. G. Krivokhijine,L. Lagamba,L. Lapikás,I. Lehmann,P. Lenisa,Wolfgang Lorenzon,B. Q. Ma,David Mahon,S. I. Manaenkov,Y. J. Mao,B. Marianski,H. Marukyan,A. Movsisyan,Morgan Murray,Y. Naryshkin,A. Nass,W.-D. Nowak,Luciano Pappalardo,R. Perez-Benito,A. Petrosyan,P. E. Reimer,A. R. Reolon,C. Riedl,Klaus Rith,A. Rostomyan,Dirk Ryckbosch,Andreas Schäfer,G. Schnell,K. P. Schüler,B. Seitz,T. A. Shibata,M. Stahl, M. Stancari,M. Statera,E. Steffens,J. J. M. Steijger,S. Taroian,Adel Terkulov,R. Truty,A. Trzcinski,Michael Tytgat,Y. Van Haarlem,C. Van Hulse, V. Vikhrov,I. Vilardi, Shan Wang,S. Yaschenko,S. Yen,D. Zeiler, B. Zihlmann,P. Zupranski

European Physical Journal C（2014）

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Abstract

Spin Density Matrix Elements (SDMEs) describing the angular distribution of exclusive ρ 0 electroproduction and decay are determined in the HERMES experiment with 27.6 GeV beam energy and unpolarized hydrogen and deuterium targets. Eight (fifteen) SDMEs that are related (unrelated) to the longitudinal polarization of the beam are extracted in the kinematic region 1More

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