Further evidence for the $Σ^{*}$ resonance with $J^P=1/2^-$ around 1380 MeV

Details Further evidence for the $Σ^{*}$ resonance with $J^P=1/2^-$ around 1380 MeV Further evidence for the $Σ^{*}$ resonance with $J^P=1/2^-$ around 1380 MeV

2009-09-08

arxiv.org/abs/0909.1380v1

Phys.Rev.C81:045210,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 40 figures

Scientific paper

10.1103/PhysRevC.81.045210

The unquenched quark models predict the new particle $\Sigma^*$ with spin parity $J^P=1/2^-$ and its mass is around the well established $\Sigma^*(1385)$ with $J^P=3/2^+$. Here by using the effective Lagrangian approach we study \kp\ reaction at the range of $\Lambda^{*}(1520)$ peak, comparing the resulting total cross section, and $\pi^+\pi^-$, $\Lambda\pi^+$, $\Lambda\pi^-$ invariant squared mass distributions for various incident $K^-$ momenta, as well as the production angular distribution of the $\Lambda$ with the data from the Lawrence Berkeley Laboratory 25-inch hydrogen bubble chamber, we find that, apart from the existing resonance $\Sigma^{*}(1385)$ with $J^P=3/2^+$, there is a strong evidence for the existence of the new resonance $\Sigma^{*}$ with $J^P=1/2^-$ around 1380 MeV. Higher statistic data on relevant reactions are needed to clarify the situation.

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