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arXiv · hep-ex/0311024

Tensor Polarization of the phi meson Photoproduced at High t

K. McCormick·the CLAS collaboration
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Abstract

As part of a measurement of the cross section of $ϕ$ meson photoproduction to high momentum transfer, we measured the polar angular decay distribution of the outgoing $K^+$ in the channel $ϕ\to K^+K^-$ in the $ϕ$ 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 $E_γ$=3.6 GeV). Above this momentum, $u$-channel production of a $ϕ$ meson dominates and induces a violation of SCHC. The deduced value of the $ϕNN$ coupling constant lies in the upper range of previously reported values.

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K. McCormick, the CLAS collaboration. 2003-11-07. Tensor Polarization of the phi meson Photoproduced at High t. https://doi.org/10.1103/physrevc.69.032203

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