Search for Theta+ via pi- p --> K- X reaction near production threshold

Details Search for Theta+ via pi- p --> K- X reaction near production threshold Search for Theta+ via pi- p --> K- X reaction near production threshold

2006-01-23

arxiv.org/abs/nucl-ex/0601032v2

Phys.Lett.B635:72-79,2006

Physics

Nuclear Physics

Nuclear Experiment

12pages, 6figures, to be published in Physics Letters B

Scientific paper

10.1016/j.physletb.2006.02.048

We have searched for $\Theta^{+}$ via $\pi^{-}p \to K^{-}X$ reaction using 1.87 and 1.92 GeV/c $\pi^{-}$ beam at the K2 beam line of the KEK 12 GeV Proton Synchrotron. In the missing mass spectrum at beam momentum of 1.92 GeV/$c$, a bump has been found at 1530 MeV/$c^{2}$ which is consistent with the mass reported by several experiments. The statistical significance of this bump, however, is only 2.5$-2.7\sigma$. Therefore we have derived the upper limit of $\Theta^{+}$ production cross section via $\pi^{-}p \to K^{-}\Theta^{+}$ reaction which is 4.3$\mu$b at 90% confidence level assuming that $\Theta^{+}$ is produced isotropically in the center of mass system.

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