Abstract
The HERMES experiment has measured the transverse polarization of Λ and Λ̄ hyperons produced inclusively in quasireal photoproduction at a positron beam energy of 27.6 GeV. The transverse polarization PnΛ of the Λ hyperon is found to be positive while the observed Λ̄ polarization is compatible with zero. The values averaged over the kinematic acceptance of HERMES are PnΛ=0.078±0.006(stat)±0.012(syst) and PnΛ̄=-0.025±0.015(stat)±0.018(syst) for Λ and Λ̄, respectively. The dependences of PnΛ and PnΛ̄ on the fraction ζ of the beam's light-cone momentum carried by the hyperon and on the hyperon's transverse momentum pT were investigated. The measured Λ polarization rises linearly with pT and exhibits a different behavior for low and high values of ζ, which approximately correspond to the backward and forward regions in the center-of-mass frame of the γ*N reaction.
| Original language | English (US) |
|---|---|
| Article number | 092008 |
| Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
| Volume | 76 |
| Issue number | 9 |
| DOIs | |
| State | Published - Nov 28 2007 |
| Externally published | Yes |
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)
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