; Elschenbroich, U. ; Ely, J. ; Fabbri, R. ; Fantoni, A. ; Fechtchenko, A. ; Felawka, L. ; Fox, B. ; Franz, J. ; Frullani, S. ; Gärber, Y. ; Gapienko, G. ; Gapienko, V. ; Garibaldi, F. ; Garutti, E. ; Gaskell, D. ; Gavrilov, G. ; Gharibyan, V. ; Graw, G. ; Grebeniouk, O. ; Greeniaus, L. G. ; Haeberli, W. ; Hafidi, K. ; Hartig, M. ; Hasch, D. ; Heesbeen, D. ; Henoch, M. ; Hertenberger, R. ; Hesselink, W. H. A. ; Hillenbrand, A. ; Holler, Y. ; Hommez, B. ; Iarygin, G. ; Izotov, A. ; Jackson, H. E. ; Jgoun, A. ; Kaiser, R. ; Kinney, E. ; Kisselev, A. ; Königsmann, K. ; Kolster, H. ; Kopytin, M. ; Korotkov, V. ; Kozlov, V. ; Krauss, B. ; Krivokhijine, V. G. ; Lagamba, L.
; Lapikás, L. ; Laziev, A. ; Lenisa, P. ; Liebing, P. ; Lindemann, T. ; Lipka, K. ; Lorenzon, W. ; Makins, N. C. R. ; Marukyan, H. ; Masoli, F. ; Menden, F. ; Mexner, V. ; Meyners, N. ; Mikloukho, O. ; Miller, C. A. ; Miyachi, Y. ; Muccifora, V. ; Nagaitsev, A. ; Nappi, E. ; Naryshkin, Y. ; Nass, A. ; Nowak, W.-D. ; Oganessyan, K. ; Ohsuga, H. ; Orlandi, G. ; Potashov, S. ; Potterveld, D. H. ; Raithel, M. ; Reggiani, D. ; Reimer, P. E.
; Reischl, A. ; Reolon, A. R. ; Rith, K. ; Rosner, G. ; Rostomyan, A. ; Ryckbosch, D. ; Sanjiev, I. ; Savin, I. ; Scarlett, C. ; Schäfer, A. ; Schill, C. ; Schnell, G. ; Schüler, K. P. ; Schwind, A. ; Seibert, J. ; Seitz, B. ; Shanidze, R. ; Shibata, T.-A. ; Shutov, V. ; Simani, M. C. ; Sinram, K. ; Stancari, M. ; Statera, M. ; Steffens, E. ; Steijger, J. J. M. ; Stewart, J. ; Stösslein, U. ; Tanaka, H. ; Taroian, S. ; Tchuiko, B. ; Terkulov, A.
; Tessarin, S. ; Thomas, E. ; Tkabladze, A. ; Trzcinski, A. ; Tytgat, M.
; Urciuoli, G. M. ; van der Nat, P. B. ; van der Steenhoven, G. ; van de Vyver, R. ; Veretennikov, D. ; Vetterli, M. C.
; Vikhrov, V. ; Vincter, M. G.
; Visser, J. ; Vogt, M. ; Volmer, J. ; Weiskopf, C. ; Wendland, J. ; Wilbert, J. ; Wise, T. ; Yen, S. ; Yoneyama, S. ; Zihlmann, B. ; Zohrabian, H. ; Zupranski, P. | Item type: | Article | ||||
|---|---|---|---|---|---|
| Journal or Publication Title: | Physical Review D | ||||
| Publisher: | AMER PHYSICAL SOC | ||||
| Place of Publication: | COLLEGE PK | ||||
| Volume: | 76 | ||||
| Number of Issue or Book Chapter: | 9 | ||||
| Date: | 2007 | ||||
| Institutions: | Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Andreas Schäfer | ||||
| Identification Number: |
| ||||
| Keywords: | INCLUSIVE HADRON-PRODUCTION; PHOTON ENERGIES; 800-GEV/C PROTONS; P INTERACTIONS; ASYMMETRY; NUCLEON; GEV/C; | ||||
| Dewey Decimal Classification: | 500 Science > 530 Physics | ||||
| Status: | Published | ||||
| Refereed: | Yes, this version has been refereed | ||||
| Created at the University of Regensburg: | Yes | ||||
| Item ID: | 68771 |
Abstract
The HERMES experiment has measured the transverse polarization of Lambda and (Lambda) over bar hyperons produced inclusively in quasireal photoproduction at a positron beam energy of 27.6 GeV. The transverse polarization P-n(Lambda) of the Lambda hyperon is found to be positive while the observed (Lambda) over bar polarization is compatible with zero. The values averaged over the kinematic ...

Abstract
The HERMES experiment has measured the transverse polarization of Lambda and (Lambda) over bar hyperons produced inclusively in quasireal photoproduction at a positron beam energy of 27.6 GeV. The transverse polarization P-n(Lambda) of the Lambda hyperon is found to be positive while the observed (Lambda) over bar polarization is compatible with zero. The values averaged over the kinematic acceptance of HERMES are P-n(Lambda)=0.078 +/- 0.006(stat)+/- 0.012(syst) and P-n((Lambda) over bar)=-0.025 +/- 0.015(stat)+/- 0.018(syst) for Lambda and (Lambda) over bar, respectively. The dependences of P-n(Lambda) and P-n((Lambda) over bar) on the fraction zeta of the beam's light-cone momentum carried by the hyperon and on the hyperon's transverse momentum p(T) were investigated. The measured Lambda polarization rises linearly with p(T) and exhibits a different behavior for low and high values of zeta, which approximately correspond to the backward and forward regions in the center-of-mass frame of the gamma*N reaction.
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