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Spin and parity measurement of the Λ(1405) baryon

K. Moriya et al. (CLAS Collaboration)
Phys. Rev. Lett. 112, 082004 – Published 28 February 2014

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+pK++Λ(1405) is analyzed in the decay channel Λ(1405)Σ++π, where the decay distribution to Σ+π 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<W<2.85GeV and for 0.6<cosθK+c.m.<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=12, as expected by most theories.

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  • Received 14 November 2013

DOI:https://doi.org/10.1103/PhysRevLett.112.082004

© 2014 American Physical Society

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Vol. 112, Iss. 8 — 28 February 2014

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