Tensor Polarization of the phi meson Photoproduced at High t

Details Tensor Polarization of the phi meson Photoproduced at High t Tensor Polarization of the phi meson Photoproduced at High t

2003-11-07

arxiv.org/abs/hep-ex/0311024v1

Phys.Rev.C69:032203,2004

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages; 5 figures

Scientific paper

10.1103/PhysRevC.69.032203

As part of a measurement 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 $\phi \to K^+K^-$ 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 $-t \sim 2.5$ GeV$^2$ 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 $\phi NN$ coupling constant lies in the upper range of previously reported values.

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