Spin and parity measurement of the Λ(1405) baryon
Abstract
A determination of the spin and parity of the Λ(1405) is presented using photoproduction data from the CLAS detector at Jefferson Lab. The reaction γ+p→K++Λ(1405) is analyzed in the decay channel Lambda(1405)→Σ++π, where the decay distribution to Σ+pi- and the variation of the Σ+ polarization with respect to the Λ(1405) polarization direction determines the parity. The Λ(1405) is produced, in the energy range 2.55 <2.85 GeV and for 0.6c.m.K+<0.9, with polarization P=0.45±0.02(stat)±0.07(syst). The analysis shows that the decays are in S wave, with the Σ+ polarized such that the Λ(1405) has spin-parity JP=1/2-, as expected by most theories.
- Authors:
-
- Carnegie Mellon Univ., Pittsburgh, PA (United States)
- Publication Date:
- Research Org.:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1121708
- Report Number(s):
- JLAB-PHY-14-1848; DOE/OR/23177-3011; arXiv:1402.2296
Journal ID: ISSN 0031-9007; TRN: US1600756
- Grant/Contract Number:
- AC05- 84ER40150; FG02-87ER40315
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 112; Journal Issue: 08; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
Moriya, Kei, and Schumacher, Reinhard A. Spin and parity measurement of the Λ(1405) baryon. United States: N. p., 2014.
Web. doi:10.1103/PhysRevLett.112.082004.
Moriya, Kei, & Schumacher, Reinhard A. Spin and parity measurement of the Λ(1405) baryon. United States. https://doi.org/10.1103/PhysRevLett.112.082004
Moriya, Kei, and Schumacher, Reinhard A. Fri .
"Spin and parity measurement of the Λ(1405) baryon". United States. https://doi.org/10.1103/PhysRevLett.112.082004. https://www.osti.gov/servlets/purl/1121708.
@article{osti_1121708,
title = {Spin and parity measurement of the Λ(1405) baryon},
author = {Moriya, Kei and Schumacher, Reinhard A.},
abstractNote = {A determination of the spin and parity of the Λ(1405) is presented using photoproduction data from the CLAS detector at Jefferson Lab. The reaction γ+p→K++Λ(1405) is analyzed in the decay channel Lambda(1405)→Σ++π, where the decay distribution to Σ+pi- and the variation of the Σ+ polarization with respect to the Λ(1405) polarization direction determines the parity. The Λ(1405) is produced, in the energy range 2.55 <2.85 GeV and for 0.6c.m.K+<0.9, with polarization P=0.45±0.02(stat)±0.07(syst). The analysis shows that the decays are in S wave, with the Σ+ polarized such that the Λ(1405) has spin-parity JP=1/2-, as expected by most theories.},
doi = {10.1103/PhysRevLett.112.082004},
journal = {Physical Review Letters},
number = 08,
volume = 112,
place = {United States},
year = {Fri Feb 28 00:00:00 EST 2014},
month = {Fri Feb 28 00:00:00 EST 2014}
}
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Works referencing / citing this record:
Status of the $${\mathbf {\Lambda (1405)}}$$ Λ ( 1405 )
journal, April 2018
- Mai, Maxim
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Topics in low-energy QCD with strange quarks
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Constraints on the chiral unitary $$\bar KN$$ amplitude from πΣK+ photoproduction data
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