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

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.
Authors:
 [1] ;  [2]
  1. Carnegie Mellon U.
  2. Indiana U.
Publication Date:
OSTI Identifier:
1096990
Report Number(s):
JLAB-PHY-13-1684; DOE/OR/23177-2497; arXiv:1303.0860
DOE Contract Number:
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Journal Name: Nuclear Physics A; Journal Volume: 914; Conference: HYP2012, Barcelona, SPAIN, 1?5 October 2012
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS