Lineshape of the Lambda(1405) measured at CLAS
The {Lambda}(1405) has been a subject of controversy for decades, and its nature as a hyperon resonance has yet to be established firmly. Its peculiar lineshape, i.e., its {Sigma}{pi} invariant mass spectrum has lead to various theoretical studies, and some of these show that it may possess strong dynamical components which are not seen in other well-known baryons. With the CLAS detector system in Hall B at Jefferson Lab, we have measured the photoproduction reaction {gamma} + p {yields} K{sup +} {Lambda}(1405) with high statistics over different {Sigma}{pi} decay channels. The reconstructed invariant mass distribution has been measured, as well as the differential cross sections for the nearby {Lambda}(1405), {Sigma}(1385), and {Lambda}(1520). Our analysis method is discussed and our near-final results for the {Lambda}(1405) lineshape is presented.
- 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:
- 1038768
- Report Number(s):
- JLAB-PHY-11-1343; DOE/OR/23177-2088; TRN: US1202000
- Journal Information:
- AIP Conf. Proc., Vol. 1441; Conference: PANIC 11, 24-29 July 2011, Cambridge, MA
- Country of Publication:
- United States
- Language:
- English
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