Differential cross sections for {\Lambda}(1520) using photoproduction at CLAS

TL;DR

This paper reports on measurements of differential cross sections for b1(1520) photoproduction at CLAS, extending previous data to higher energies and analyzing decay channels without discovering new resonances.

Contribution

It provides new differential cross section data as a function of invariant 4-momentum transfer, supporting Regge-exchange models and confirming no new N* resonances are observed.

Findings

Good agreement with previous measurements

Extended cross section data to higher energies

No new N* resonances found

Abstract

The reaction $\gamma p \rightarrow K^{+} \Lambda(1520)$ using photoproduction data from the CLAS $g12$ experiment at Jefferson Lab is studied. The decay of $\Lambda(1520)$ into two exclusive channels, $\Sigma^{+}\pi^{-}$ and $\Sigma^{-}\pi^{+}$, is studied from the detected $K^{+}$, $\pi^{+}$, and $\pi^{-}$ particles. A good agreement is established for the $\Lambda(1520)$ differential cross sections with the previous CLAS measurements. The differential cross sections as a function of CM angle are extended to higher photon energies. Newly added are the differential cross sections as a function of invariant 4-momentum transfer $t$, which is the natural variable to use for a theoretical model based on a Regge-exchange reaction mechanism. No new $N^*$ resonances decaying into the $K^+\Lambda(1520)$ final state are found.