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Transverse polarization of Λ hyperons from quasireal photoproduction on nuclei

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arxiv 1406.3236 v2 pith:63AMRWDN submitted 2014-06-12 hep-ex nucl-ex

Transverse polarization of Λ hyperons from quasireal photoproduction on nuclei

The HERMES Collaboration: A. Airapetian , N. Akopov , Z. Akopov , E.C. Aschenauer , W. Augustyniak , R. Avakian , A. Avetissian , E. Avetisyan
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S. Belostotski N. Bianchi H.P. Blok A. Borissov J. Bowles I. Brodski V. Bryzgalov J. Burns M. Capiluppi G.P. Capitani E. Cisbani G. Ciullo M. Contalbrigo P.F. Dalpiaz W. Deconinck R. De Leo L. De Nardo E. De Sanctis M. Diefenthaler P. Di Nezza M. D\"uren M. Ehrenfried G. Elbakian F. Ellinghaus R. Fabbri A. Fantoni L. Felawka S. Frullani D. Gabbert G. Gapienko V. Gapienko F. Garibaldi G. Gavrilov V. Gharibyan F. Giordano S. Gliske M. Golembiovskaya C. Hadjidakis M. Hartig D. Hasch A. Hillenbrand M. Hoek Y. Holler I. Hristova Y. Imazu A. Ivanilov H.E. Jackson H.S. Jo S. Joosten R. Kaiser G. Karyan T. Keri E. Kinney A. Kisselev N. Kobayashi V. Korotkov V. Kozlov P. Kravchenko V.G. Krivokhijine L. Lagamba L. Lapik\'as I. Lehmann P. Lenisa A. L\'opez Ruiz W. Lorenzon X.-G. Lu B.-Q. Ma D. Mahon N.C.R. Makins S.I. Manaenkov Y. Mao B. Marianski A. Martinez de la Ossa H. Marukyan C.A. Miller Y. Miyachi A. Movsisyan V. Muccifora M. Murray A. Mussgiller E. Nappi Y. Naryshkin A. Nass M. Negodaev W.-D. Nowak L.L. Pappalardo R. Perez-Benito P.E. Reimer A.R. Reolon C. Riedl K. Rith G. Rosner A. Rostomyan J. Rubin D. Ryckbosch Y. Salomatin F. Sanftl A. Sch\"afer G. Schnell K.P. Sch\"uler B. Seitz T.-A. Shibata V. Shutov M. Stancari M. Statera E. Steffens J.J.M. Steijger J. Stewart F. Stinzing S. Taroian A. Terkulov R. Truty A. Trzcinski M. Tytgat A. Vandenbroucke Y. Van Haarlem C. Van Hulse D. Veretennikov V. Vikhrov I. Vilardi S. Wang S. Yaschenko Z. Ye W. Yu V. Zagrebelnyy D. Zeiler B. Zihlmann P. Zupranski
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classification hep-ex nucl-ex
keywords nucleipolarizationhyperonslambdaleptonphotoproductionquasirealtarget
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The transverse polarization of $\Lambda$ hyperons was measured in inclusive quasireal photoproduction for various target nuclei ranging from hydrogen to xenon. The data were obtained by the HERMES experiment at HERA using the 27.6 GeV lepton beam and nuclear gas targets internal to the lepton storage ring. The polarization observed is positive for light target nuclei and is compatible with zero for krypton and xenon.

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