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 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<2.85  GeV and for 0.6<cosθc.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=12−, as expected by most theories.

Moriya, K., Schumacher R, A., Aghasyan, M., Amaryan M, J., Anderson M, D., Pereira S, A., et al. (2014). Spin and parity measurement of the Lambda(1405) baryon. PHYSICAL REVIEW LETTERS, 112, 082004 [10.1103/PhysRevLett.112.082004].

Spin and parity measurement of the Lambda(1405) baryon

D'ANGELO, ANNALISA;
2014-01-01

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 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
2014
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/04 - FISICA NUCLEARE E SUBNUCLEARE
English
Con Impact Factor ISI
Clas Collaboration
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.082004
Moriya, K., Schumacher R, A., Aghasyan, M., Amaryan M, J., Anderson M, D., Pereira S, A., et al. (2014). Spin and parity measurement of the Lambda(1405) baryon. PHYSICAL REVIEW LETTERS, 112, 082004 [10.1103/PhysRevLett.112.082004].
Moriya, K; Schumacher R, A; Aghasyan, M; Amaryan M, J; Anderson M, D; Pereira S, A; Ball, J; Baltzell N, A; Battaglieri, M; Bellis, M; Biselli A, S; B...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/94987
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