Isospin Decomposition of the Photoproduced Sigma pi System Near the Lambda(1405)

Conference · Sun Sep 01 00:00:00 EDT 2013 · Nuclear Physics A

DOI:https://doi.org/10.1016/j.nuclphysa.2013.03.003· OSTI ID:1096990

Schumacher, Reinhard A. ^[1]; Moriya, Kei ^[2]

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1. Carnegie Mellon U.
2. Indiana U.

Recent experimental results for the reaction \gamma + p \to K^+ + \Sigma + \pi\ from CLAS at Jefferson Lab are discussed. It was found that the mass distributions or "line shapes" of the three charge combinations \Sigma^+ \pi^-, \Sigma^0 \pi^0 and \Sigma^- \pi^+ differ significantly. Our results show that the \Lambda(1405), as the I=0 constituent of the reaction, must be accompanied by an I > 0 component. We discuss phenomenological fits to the data to test the possible forms and magnitudes of these amplitudes. A two-amplitude I=0 fit of Breit-Wigner form to the \Sigma^0\pi^0 channel alone works quite well. The addition of a single I=1 amplitude works fairly well to model all the line shapes simultaneously.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1096990
• Report Number(s): JLAB-PHY-13-1684; DOE/OR/23177-2497; arXiv:1303.0860
• Journal Information: Nuclear Physics A, Vol. 914; Conference: HYP2012, Barcelona, SPAIN, 1?5 October 2012
• Country of Publication: United States
• Language: English

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