Evidence of the Theta^+ in the γ d to K^+K^-pn reaction

T. Nakano , N. Muramatsu , D.S. Ahn , J.K. Ahn , H. Akimune , Y. Asano , W.C. Chang , S. Dat\'e

show 48 more authors

H. Ejiri H. Fujimura M. Fujiwara S. Fukui H. Hasegawa K. Hicks K. Horie T. Hotta K. Imai T. Ishikawa T. Iwata Y. Kato H. Kawai Z.Y. Kim K. Kino H. Kohri N. Kumagai S. Makino T. Matsuda N. Matsuoka T. Matsumura T. Mibe M. Miyabe Y. Miyachi M. Niiyama M. Nomachi Y. Ohashi H. Ohkuma T. Ooba D.S. Oshuev C. Rangacharyulu A. Sakaguchi P.M. Shagin Y. Shiino A. Shimizu H. Shimizu Y. Sugaya M. Sumihama Y. Toi H. Toyokawa A. Wakai C.W. Wang S.C. Wang K. Yonehara T. Yorita M. Yoshimura M. Yosoi R.G.T. Zegers (LEPS Collaboration)

Authors on Pith no claims yet

classification ⚛️ nucl-ex

keywords thetagammareactionevidencepeakrangeanalysisangles

0 comments

read the original abstract

The \gamma d \to K^+K^-pn reaction has been studied to search for the evidence of the \Theta^+ by detecting K^+K^- pairs at forward angles. The Fermi-motion corrected nK^+ invariant mass distribution shows a narrow peak at 1.524 +- 0.002 + 0.003 GeV/c^2. The statistical significance of the peak calculated from a shape analysis is 5.1 \sigma, and the differential cross-section for the \gamma n \to K^- \Theta^+ reaction is estimated to be 12 +- 2 nb/sr in the photon energy range from 2.0 GeV to 2.4 GeV in the LEPS angular range by assuming the isotropic production of the \Theta^+ in the \gamma n center-of-mass system. The obtained results support the existence of the \Theta^+.

This paper has not been read by Pith yet.

Evidence of the Theta^+ in the γ d to K^+K^-pn reaction

discussion (0)