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

Source: [Search for Theta+ via pi- p --\> K- X reaction near production threshold](<https://www.sota2.com/research/paper/68fa22417a2b558e2933af9f>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T02:58:28.044Z

Authors: K.Miwa

Published: 2006-01-23T15:37:54.000Z

## Abstract

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.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/nucl-ex/0601032>)

[PDF](<https://arxiv.org/pdf/nucl-ex/0601032.pdf>)