Transverse polarization of $Λ$ hyperons from quasireal photoproduction on nuclei

preprint2014arXivOpen access

The HERMES collaboration A. Airapetian N. Akopov Z. Akopov E. C. Aschenauer W. Augustyniak R. Avakian A. Avetissian E. Avetisyan 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. Düren 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. Lapikás I. Lehmann P. Lenisa A. López 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. Schäfer G. Schnell K. P. Schüler 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

hep-ex nucl-ex

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The transverse polarization of $Λ$ 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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Transverse polarization of $Λ$ hyperons from quasireal photoproduction on nuclei

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Transverse polarization of ΛΛΛ hyperons from quasireal photoproduction on nuclei

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Transverse polarization of $Λ$ hyperons from quasireal photoproduction on nuclei