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Search for the Theta+ via the K+p-->pi+X reaction with a 1.2 GeV/c K+ beam

Abstract : The Theta+ was searched for via the K+p-->pi+X reaction using the 1.2 GeV/c K+ beam at the K6 beam line of the KEK-PS 12 GeV Proton Synchrotron. In the missing mass spectrum of the K+p-->pi+X reaction, no clear peak structure was observed. Therefore a 90% C.L. upper limit of 3.5 µb/sr was derived for the differential cross section averaged over 2° to 22° in the laboratory frame of the K+p-->pi+Theta+ reaction. This upper limit is much smaller than the theoretical calculation for the t-channel process where a K0* is exchanged. From the present result, either the t-channel process is excluded or the coupling constant of gK*NTheta is quite small.
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http://hal.in2p3.fr/in2p3-00421359
Contributor : Sophie Heurteau <>
Submitted on : Thursday, October 1, 2009 - 4:52:13 PM
Last modification on : Wednesday, October 14, 2020 - 3:59:53 AM

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K. Miwa, S. Dairaku, D. Nakajima, S. Ajimura, J. Arvieux, et al.. Search for the Theta+ via the K+p-->pi+X reaction with a 1.2 GeV/c K+ beam. Physical Review C, American Physical Society, 2008, 77, pp.045203 (10). ⟨10.1103/PhysRevC.77.045203⟩. ⟨in2p3-00421359⟩

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