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arXiv · 1808.01918

Photoproduction of $K^+K^-$ meson pairs on the proton

S. Lombardo·M. Battaglieri·A. Celentano·A. D'Angelo·R. De Vita·A. Filippi·D. Glazier·S. M. Hughes·V. Mathieu·A. Rizzo·E. Santopinto·I. Stankovic·A. P. Szczepaniak·D. Watts·L. Zana·the CLAS Collaboration
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Abstract

The exclusive reaction $\gamma p \to p K^+ K^-$ was studied in the photon energy range $3.0 - 3.8 \mbox{ GeV}$ and momentum transfer range $0.6<-t<1.3 \mbox{ GeV}^2$. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. In this kinematic range the integrated luminosity was approximately 20 pb$^{-1}$. The reaction was isolated by detecting the $K^+$ and the proton in CLAS, and reconstructing the $K^-$ via the missing-mass technique. Moments of the di-kaon decay angular distributions were extracted from the experimental data. Besides the dominant contribution of the $\phi$ meson in the $P$-wave, evidence for $S-P$ interference was found. The differential production cross sections $d\sigma/dt$ for individual waves in the mass range of the $\phi$ resonance were extracted and compared to predictions of a Regge-inspired model. This is the first time the $t$-dependent cross section of the $S$-wave contribution to the elastic $K^+K^-$ photoproduction has been measured.

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S. Lombardo, M. Battaglieri, A. Celentano, A. D'Angelo, R. De Vita, A. Filippi, D. Glazier, S. M. Hughes, V. Mathieu, A. Rizzo, E. Santopinto, I. Stankovic, A. P. Szczepaniak, D. Watts, L. Zana, the CLAS Collaboration. 2018-08-03. Photoproduction of $K^+K^-$ meson pairs on the proton. https://doi.org/10.1103/physrevd.98.052009

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