As part of a measurement [E. Anciant , Phys. Rev. Lett. 85, 4682 (2000)] of the cross section of phi meson photoproduction to high momentum transfer, we measured the polar angular decay distribution of the outgoing K+ in the channel phi-->K+K- in the phi center-of-mass frame (the helicity frame). We find that s-channel helicity conservation (SCHC) holds in the kinematical range where t-channel exchange dominates (up to -tsimilar to2.5 GeV2 for E-gamma=3.6 GeV). Above this momentum, u-channel production of a phi meson dominates and induces a violation of SCHC. The deduced value of the phiNN coupling constant lies in the upper range of previously reported values.
Tensor Polarization of the Phi Meson Photoproduced at high T
CORVISIERO, PIETRO;RICCO, GIOVANNI;SANZONE, MARCELLA;TAIUTI, MAURO GINO;
2004-01-01
Abstract
As part of a measurement [E. Anciant , Phys. Rev. Lett. 85, 4682 (2000)] of the cross section of phi meson photoproduction to high momentum transfer, we measured the polar angular decay distribution of the outgoing K+ in the channel phi-->K+K- in the phi center-of-mass frame (the helicity frame). We find that s-channel helicity conservation (SCHC) holds in the kinematical range where t-channel exchange dominates (up to -tsimilar to2.5 GeV2 for E-gamma=3.6 GeV). Above this momentum, u-channel production of a phi meson dominates and induces a violation of SCHC. The deduced value of the phiNN coupling constant lies in the upper range of previously reported values.
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