Skip to Main content Skip to Navigation
Journal articles

Spin and parity measurement of the Lambda(1405) baryon

K. Moriya R.A. Schumacher M. Aghasyan M.J. Amaryan M.D. Anderson S. Anefalos Pereira J. Ball 1 N.A. Baltzell M. Battaglieri M. Bellis A.S. Biselli J. Bono S. Boiarinov W.J. Briscoe W.K. Brooks V.D. Burkert D.S. Carman A. Celentano S. Chandavar G. Charles P.L. Cole P. Collins M. Contalbrigo O. Cortes V. Crede A. d'Angelo N. Dashyan R. de Vita E. de Sanctis B. Dey C. Djalali M. Dugger R. Dupré 2 H. Egiyan A. El Alaoui L. El Fassi L. Elouadrhiri P. Eugenio G. Fedotov S. Fegan J.A. Fleming G.P. Gilfoyle K.L. Giovanetti F.X. Girod 1 W. Gohn E. Golovatch R.W. Gothe M. Guidal 2 K.A. Griffioen K. Hafidi H. Hakobyan K. Hicks M. Holtrop Y. Ilieva D.G. Ireland B.S. Ishkhanov E.L. Isupov H.S. Jo 2 K. Joo D. Keller M. Khandaker W. Kim S. Koirala V. Kubarovsky S.V. Kuleshov P. Lenisa H.Y. Lu I.J.D. Macgregor N. Markov M. Mccracken B. Mckinnon M.D. Mestayer C.A. Meyer M. Mirazita V. Mokeev 2 R.A. Montgomery H. Moutarde 1 E. Munevar P. Nadel-Turonski S. Niccolai 2 I. Niculescu M. Osipenko L.L. Pappalardo E. Pasyuk P. Peng J.J. Phillips S. Pisano 2 O. Pogorelko S. Pozdniakov J.W. Price S. Procureur 1 A.J.R. Puckett B.A. Raue D. Rimal M. Ripani B.G. Ritchie A. Rizzo G. Rosner P. Roy F. Sabatié 1 C. Salgado D. Schott E. Seder I. Senderovich E.S. Smith D. Sokhan G.D. Smith S. Stepanyan S. Strauch W. Tang H. Voskanyan E. Voutier 3 N.K. Walford D.P. Watts L.B. Weinstein M. Williams M.H. Wood N. Zachariou L. Zana J. Zhang V. Ziegler Z.W. Zhao I. Zonta
Abstract : A determination of the spin and parity of the $\Lambda(1405)$ is presented using photoproduction data from the CLAS detector at Jefferson Lab. The reaction $\gamma + p \to K^+ + \Lambda(1405)$ is analyzed in the decay channel $\Lambda(1405) \to \Sigma^+ + \pi^-$, where the decay distribution to $\Sigma^+ \pi^-$ and the variation of the $\Sigma^+$ polarization with respect to the $\Lambda(1405)$ polarization direction determines the parity. The $\Lambda(1405)$ is produced, in the energy range $2.55 < W < 2.85$ GeV and for $0.6 < \cos \theta_{K^+} < 0.9$, with polarization $P = 0.45 \pm 0.02 (\text{stat}) \pm 0.07 (\text{syst})$. The analysis shows that the decays are in $S$ wave, with the $\Sigma^+$ polarized such that the $\Lambda(1405)$ has spin-parity $J^P = 1/2^-$, as expected by most theories.
Complete list of metadatas

http://hal.in2p3.fr/in2p3-00945802
Contributor : Emmanuelle Vernay <>
Submitted on : Thursday, February 13, 2014 - 9:09:22 AM
Last modification on : Wednesday, September 16, 2020 - 4:08:49 PM

Links full text

Identifiers

Collections

Citation

K. Moriya, R.A. Schumacher, M. Aghasyan, M.J. Amaryan, M.D. Anderson, et al.. Spin and parity measurement of the Lambda(1405) baryon. Physical Review Letters, American Physical Society, 2014, 112, pp.082004. ⟨10.1103/PhysRevLett.112.082004⟩. ⟨in2p3-00945802⟩

Share

Metrics

Record views

352