A determination of the spin and parity of the Λð1405Þ is presented using photoproduction data from the CLAS detector at Jefferson Lab. The reaction γ þ p → Kþ þ Λð1405Þ is analyzed in the decay channel Λð1405Þ → Σþ þ π−, where the decay distribution to Σþπ− and the variation of the Σþ polarization with respect to the Λð1405Þ polarization direction determines the parity. The Λð1405Þ is produced, in the energy range 2.55 < W < 2.85 GeV and for 0.6 < cos θc:m: Kþ < 0.9, with polarization P ¼ 0.45 0.02ðstatÞ 0.07ðsystÞ. The analysis shows that the decays are in S wave, with the Σþ polarized such that the Λð1405Þ has spin-parity JP ¼ 1 2 −, as expected by most theories.

Spin and parity measurement of the Lambda(1405) baryon

CONTALBRIGO, Marco;LENISA, Paolo;PAPPALARDO, Luciano Libero;
2014

Abstract

A determination of the spin and parity of the Λð1405Þ is presented using photoproduction data from the CLAS detector at Jefferson Lab. The reaction γ þ p → Kþ þ Λð1405Þ is analyzed in the decay channel Λð1405Þ → Σþ þ π−, where the decay distribution to Σþπ− and the variation of the Σþ polarization with respect to the Λð1405Þ polarization direction determines the parity. The Λð1405Þ is produced, in the energy range 2.55 < W < 2.85 GeV and for 0.6 < cos θc:m: Kþ < 0.9, with polarization P ¼ 0.45 0.02ðstatÞ 0.07ðsystÞ. The analysis shows that the decays are in S wave, with the Σþ polarized such that the Λð1405Þ has spin-parity JP ¼ 1 2 −, as expected by most theories.
2014
K., Moriya; Schumacher, R.  . A.; M., Aghasyan; Amaryan, M.  . J.; Anderson, M.  . D.; S., Anefalos Pereira; J., Ball; Baltzell, N.  . A.; M., Battagl...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2018019
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