Spin and parity measurement of the Λ(1405) baryon

Moriya, Kei; Schumacher, Reinhard A.

doi:10.1103/PhysRevLett.112.082004

Spin and parity measurement of the Λ(1405) baryon

Journal Article · Fri Feb 28 00:00:00 EST 2014 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.112.082004· OSTI ID:1121708

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

Carnegie Mellon Univ., Pittsburgh, PA (United States)

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 c.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 J^P=1/2-, as expected by most theories.

View Accepted Manuscript (DOE)

Research Organization:: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Energy Research (ER); USDOE Office of Science (SC)

Grant/Contract Number:: AC05-84ER40150; FG02-87ER40315

OSTI ID:: 1121708

Report Number(s):: DOE/OR/23177--3011; JLAB-PHY--14-1848; arXiv:1402.2296

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 08 Vol. 112; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (7)

Status of the $${\mathbf {\Lambda (1405)}}$$ Λ ( 1405 ) Mai, Maxim Few-Body Systems, Vol. 59, Issue 4 https://doi.org/10.1007/s00601-018-1389-4	journal	April 2018
Topics in low-energy QCD with strange quarks Weise, Wolfram Hyperfine Interactions, Vol. 233, Issue 1-3 https://doi.org/10.1007/s10751-015-1129-9	journal	February 2015
Structure of Λ ( 1405 ) and construction of K ¯ N local potential based on chiral SU(3) dynamics Miyahara, Kenta; Hyodo, Tetsuo Physical Review C, Vol. 93, Issue 1 https://doi.org/10.1103/physrevc.93.015201	journal	January 2016
S = − 1 meson-baryon interaction and the role of isospin filtering processes Feijoo, A.; Magas, V.; Ramos, A. Physical Review C, Vol. 99, Issue 3 https://doi.org/10.1103/physrevc.99.035211	journal	March 2019
Meson-baryon scattering up to the next-to-next-to-leading order in covariant baryon chiral perturbation theory Lu, Jun-Xu; Geng, Li-Sheng; Ren, Xiu-Lei Physical Review D, Vol. 99, Issue 5 https://doi.org/10.1103/physrevd.99.054024	journal	March 2019
Hadronic molecules Guo, Feng-Kun; Hanhart, Christoph; Meißner, Ulf-G. Reviews of Modern Physics, Vol. 90, Issue 1 https://doi.org/10.1103/revmodphys.90.015004	journal	February 2018
Constraints on the chiral unitary $$\bar KN$$ amplitude from πΣK+ photoproduction data Mai, Maxim; Meißner, Ulf-G. The European Physical Journal A, Vol. 51, Issue 3 https://doi.org/10.1140/epja/i2015-15030-3	journal	March 2015

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