Spin and parity measurement of the Lambda(1405) baryon - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physical Review Letters Year : 2014

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 , Pascal 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
K. Moriya
  • Function : Author
R.A. Schumacher
  • Function : Author
M. Aghasyan
  • Function : Author
M.J. Amaryan
  • Function : Author
M.D. Anderson
  • Function : Author
S. Anefalos Pereira
  • Function : Author
N.A. Baltzell
  • Function : Author
M. Battaglieri
  • Function : Author
M. Bellis
  • Function : Author
A.S. Biselli
  • Function : Author
J. Bono
  • Function : Author
S. Boiarinov
  • Function : Author
W.J. Briscoe
  • Function : Author
W.K. Brooks
V.D. Burkert
  • Function : Author
D.S. Carman
  • Function : Author
A. Celentano
S. Chandavar
  • Function : Author
G. Charles
  • Function : Author
P.L. Cole
P. Collins
  • Function : Author
M. Contalbrigo
  • Function : Author
O. Cortes
  • Function : Author
V. Crede
  • Function : Author
A. d'Angelo
N. Dashyan
  • Function : Author
R. de Vita
  • Function : Author
E. de Sanctis
  • Function : Author
B. Dey
  • Function : Author
C. Djalali
  • Function : Author
M. Dugger
  • Function : Author
R. Dupré
H. Egiyan
A. El Alaoui
  • Function : Author
L. El Fassi
  • Function : Author
L. Elouadrhiri
  • Function : Author
P. Eugenio
  • Function : Author
G. Fedotov
  • Function : Author
S. Fegan
J.A. Fleming
  • Function : Author
G.P. Gilfoyle
K.L. Giovanetti
  • Function : Author
W. Gohn
  • Function : Author
E. Golovatch
  • Function : Author
R.W. Gothe
K.A. Griffioen
  • Function : Author
K. Hafidi
  • Function : Author
H. Hakobyan
  • Function : Author
K. Hicks
  • Function : Author
M. Holtrop
Y. Ilieva
  • Function : Author
D.G. Ireland
  • Function : Author
B.S. Ishkhanov
  • Function : Author
E.L. Isupov
  • Function : Author
K. Joo
  • Function : Author
D. Keller
M. Khandaker
W. Kim
  • Function : Author
S. Koirala
  • Function : Author
V. Kubarovsky
  • Function : Author
S.V. Kuleshov
  • Function : Author
P. Lenisa
H.Y. Lu
  • Function : Author
I.J.D. Macgregor
N. Markov
  • Function : Author
M. Mccracken
  • Function : Author
B. Mckinnon
  • Function : Author
M.D. Mestayer
  • Function : Author
C.A. Meyer
  • Function : Author
M. Mirazita
  • Function : Author
V. Mokeev
R.A. Montgomery
  • Function : Author
E. Munevar
  • Function : Author
P. Nadel-Turonski
  • Function : Author
I. Niculescu
  • Function : Author
M. Osipenko
L.L. Pappalardo
  • Function : Author
E. Pasyuk
P. Peng
  • Function : Author
J.J. Phillips
  • Function : Author
O. Pogorelko
  • Function : Author
S. Pozdniakov
  • Function : Author
J.W. Price
  • Function : Author
A.J.R. Puckett
  • Function : Author
B.A. Raue
  • Function : Author
D. Rimal
  • Function : Author
M. Ripani
B.G. Ritchie
  • Function : Author
A. Rizzo
  • Function : Author
G. Rosner
  • Function : Author
Pascal Roy
  • Function : Author
C. Salgado
  • Function : Author
D. Schott
  • Function : Author
E. Seder
  • Function : Author
I. Senderovich
  • Function : Author
E.S. Smith
  • Function : Author
D. Sokhan
  • Function : Author
G.D. Smith
  • Function : Author
S. Stepanyan
  • Function : Author
S. Strauch
  • Function : Author
W. Tang
  • Function : Author
H. Voskanyan
  • Function : Author
N.K. Walford
  • Function : Author
D.P. Watts
  • Function : Author
L.B. Weinstein
  • Function : Author
M. Williams
  • Function : Author
M.H. Wood
  • Function : Author
N. Zachariou
L. Zana
J. Zhang
  • Function : Author
V. Ziegler
  • Function : Author
Z.W. Zhao
  • Function : Author
I. Zonta
  • Function : Author

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.

Dates and versions

in2p3-00945802 , version 1 (13-02-2014)

Identifiers

Cite

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, 2014, 112, pp.082004. ⟨10.1103/PhysRevLett.112.082004⟩. ⟨in2p3-00945802⟩
58 View
0 Download

Altmetric

Share

Gmail Facebook X LinkedIn More