Transverse polarization of Λ hyperons from quasi-real photoproduction on nuclei

Airapetian (Giessen U., A.; Michigan, U.; Akopov (Yerevan Phys Inst, N.; Akopov, Z.; Aschenauer (DESY, E. C.; Augustyniak (NCBJ, W.; Swierk,; Avakian, R.; Avetissian (Yerevan Phys Inst, A.; Avetisyan (DESY, E.; Belostotski (St Petersburg, S.; Inp,; Bianchi (Frascati, N.; Blok (NIKHEF, H. P.; Amsterdam,; Vrije, U.; Borissov (DESY, A.; Bowles (Glasgow U., J.; Brodski (Giessen U., I.; Bryzgalov (Serpukhov, V.; Ihep,; Burns (Glasgow U., J.; Capiluppi (INFN, M.; Ferrara,; Capitani (Frascati, G. P.; Cisbani (INFN, E.; Rome,; Ciullo, G.; Contalbrigo, M.; Dalpiaz (INFN, P. F.; Deconinck (DESY, W.; De Leo (INFN, R.; Bari,; De Nardo (Gent U., L.; Desy,; De Sanctis (Frascati, E.; Diefenthaler (Illinois U., M.; Urbana,; Erlangen Nuremberg, U.; Di Nezza (Frascati, P.; Duren, M.; Ehrenfried (Giessen U., M.; Elbakian (Yerevan Phys Inst, G.; Ellinghaus (Colorado U., F.; Fabbri (DESY, R.; Fantoni (Frascati, A.; Felawka (TRIUMF, L.; Frullani (INFN, S.; Gabbert (Gent U., D.; Gapienko, G.; Gapienko (Serpukhov, V.; Garibaldi (INFN, F.; Gavrilov (St Petersburg, G.; Triumf,; Gharibyan (Yerevan Phys Inst, V.; Giordano (DESY, F.; Infn,; Gliske (Michigan U., S.; Golembiovskaya (DESY, M.; Hadjidakis (Frascati, C.; Hartig (DESY, M.; Hasch (Frascati, D.; Hillenbrand (DESY, A.; Hoek (Glasgow U., M.; Holler, Y.; Hristova (DESY, I.; Imazu (Tokyo Inst Tech, Y.; Ivanilov (Serpukhov, A.; Jackson (Argonne, H. E.; Jo (Gent U., H. S.; Joosten (Illinois U., S.; Kaiser (Glasgow U., R.; Karyan (Yerevan Phys Inst, G.; Keri (Glasgow U., T.; Giessen, U.; Kinney (Colorado U., E.; Kisselev (St Petersburg, A.; Kobayashi (Tokyo Inst Tech, N.; Korotkov (Serpukhov, V.; Kozlov (Lebedev Inst, V.; Kravchenko (St Petersburg, P.; Krivokhijine (Dubna, V. G.; Jinr,; Lagamba (INFN, L.; Lapikas (NIKHEF, L.; Lehmann (Glasgow U., I.; Lenisa (INFN, P.; Lopez Ruiz (Gent U., A.; Lorenzon (Michigan U., W.; Lu (Tokyo Inst Tech, X. R.; Ma (Peking U., B. Q.; Mahon (Glasgow U., D.; Makins (Illinois U., N. C. R.; Manaenkov (St Petersburg, S. I.; Mao (Peking U., Y.; Marianski (NCBJ, B.; Martinez de la Ossa (Colorado U., A.; Marukyan (Yerevan Phys Inst, H.; Miller (TRIUMF, C. A.; Miyachi (Tokyo Inst Tech, Y.; Movsisyan (INFN, A.; Inst, Yerevan Phys; Muccifora (Frascati, V.; Murray (Glasgow U., M.; Mussgiller (DESY, A.; Nappi (INFN, E.; Naryshkin (St Petersburg, Y.; Nass (Erlangen Nuremberg U., A.; Negodaev, M.; Nowak (DESY, W. D.; Pappalardo (INFN, L. L.; Perez Benito (Giessen U., R.; Raithel (Erlangen Nuremberg U., M.; Reimer (Argonne, P. E.; Reolon (Frascati, A. R.; Riedl (DESY, C.; Rith (Erlangen Nuremberg U., K.; Rosner (Glasgow U., G.; Rostomyan (DESY, A.; Rubin (Illinois U., J.; Ryckbosch (Gent U., D.; Salomatin (Serpukhov, Y.; Sanftl (Tokyo Inst Tech, F.; Schafer (Regensburg U., A.; Schnell (Basque U., G.; Bilbao,; Gent, U.; Schuler (DESY, K. P.; Seitz (Glasgow U., B.; Shibata (Tokyo Inst Tech, T. A.; Shutov (Dubna, V.; Stancari, M.; Statera (INFN, M.; Steffens (Erlangen Nuremberg U., E.; Steijger (NIKHEF, J. J. M.; Stewart (DESY, J.; Stinzing (Erlangen Nuremberg U., F.; Taroian (Yerevan Phys Inst, S.; Terkulov (Lebedev Inst, A.; Truty (Illinois U., R.; Trzcinski (NCBJ, A.; Tytgat, M.; Vandenbroucke, A.; Van Haarlem (Gent U., Y.; Van Hulse (Basque U., C.; Veretennikov, D.; Vikhrov (St Petersburg, V.; Vilardi (INFN, I.; Wang (Peking U., S.; Yaschenko (DESY, S.; Ye (DESY, Z.; Yu (Giessen U., W.; Zagrebelnyy (Giessen U., V.; Zeiler (Erlangen Nuremberg U., D.; Zihlmann (DESY, B.; Zupranski (NCBJ, P.

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Transverse polarization of Λ hyperons from quasi-real photoproduction on nuclei

Journal article published in 2014 by A. Airapetian (Giessen U., U. Michigan, N. Akopov (Yerevan Phys Inst, Z. Akopov, E. C. Aschenauer (DESY, W. Augustyniak (NCBJ, Swierk, R. Avakian, A. Avetissian (Yerevan Phys Inst, E. Avetisyan (DESY, S. Belostotski (St Petersburg, Inp, N. Bianchi (Frascati, H. P. Blok (NIKHEF, Amsterdam and other authors.

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Abstract

The transverse polarization of Λ hyperons was measured in inclusive quasi-real 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.