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Decay of the Λ(1405) hyperon to Σ0π0 measured at GlueX

Conference · · EPJ Web of Conferences (Online)
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Among the light baryons, the Jπ = 1/2- Λ(1405) hyperon is an important special case as it sits just below the $$N\bar{K}$$ threshold and decays almost exclusively to Σπ. Some long-standing hypotheses for Λ(1405) are that it could be a $$N\bar{K}$$ bound state or a Σπ continuum resonance. It may also be considered as a simple quark-model resonance, the P-wave companion of the Λ(1520). In recent years chiral unitary models have suggested that there are two isospin zero poles present in this mass region, and that the “line shape" of the Λ(1405) depends to what extent each of the two poles are stimulated in a given reaction. Below the $$N\bar{K}$$ threshold, the Λ(1405) decays to the three Σπ charge combinations. The Σ0π0 mode is purely I = 0 and it is uncontaminated by complications arising from I = 1 scattering processes contributing to the reaction mechanism in the Σ+π- and Σ-π+ decays. It is also not affected from production and decay of the nearby Σ0(1385) hyperon. The GlueX experiment at Jefferson Lab has been used to study the Λ(1405) → Σ0π0 decay mode. We focus on the preliminary results of dσ/dMΣ0π0 and fits to the line shape of the Λ(1405) region in the -(t - tmin) range 0 - 1.5 GeV2 from analyzing the reaction γp → K+Λ* using the data collected during the first phase of the GlueX program.

Research Organization:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
DOE Contract Number:
AC05-06OR23177
OSTI ID:
1972817
Report Number(s):
JLAB-PHY-22-3729; arXiv:2209.06230; DOE/OR/23177-5622
Journal Information:
EPJ Web of Conferences (Online), Vol. 271; Conference: EPJ Web of Conferences, HYP2022 - 14th International Conference on Hypernuclear and Strange Particle Physics Prague, Czech Republic, June 27-July 1, 2022; ISSN 2100-014X
Publisher:
EDP Sciences
Country of Publication:
United States
Language:
English

References (9)

Study of Resonances of the Σ − π System journal June 1961
Constraints on the chiral unitary $$\bar KN$$ amplitude from πΣK+ photoproduction data journal March 2015
Review of Particle Physics journal August 2022
Lineshape of the Λ(1405) hyperon measured through its Σ0π0 decay journal February 2008
The energy dependence of low energy K−-proton processes journal September 1959
Photoproduction of the Λ(1405) on the proton and nuclei journal May 1999
The GlueX beamline and detector
  • Adhikari, S.; Akondi, C. S.; Al Ghoul, H.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 987 https://doi.org/10.1016/j.nima.2020.164807
journal January 2021
Measurement of the Σ π photoproduction line shapes near the Λ ( 1405 ) journal March 2013
Photoproduction of K+Λ(1405)→K+π0Σ0 extending to forward angles and low momentum transfer journal October 2022

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