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
- Function : Author
- PersonId : 755396
- ORCID : 0000-0001-6161-3570
V.D. Burkert
- Function : Author
D.S. Carman
- Function : Author
A. Celentano
- Function : Author
- PersonId : 764982
- ORCID : 0000-0002-7104-2983
S. Chandavar
- Function : Author
G. Charles
- Function : Author
P.L. Cole
- Function : Author
- PersonId : 755394
- ORCID : 0000-0002-9922-1350
P. Collins
- Function : Author
M. Contalbrigo
- Function : Author
O. Cortes
- Function : Author
V. Crede
- Function : Author
A. d'Angelo
- Function : Author
- PersonId : 755183
- ORCID : 0000-0003-3050-4907
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
- Function : Author
- PersonId : 740338
- IdHAL : raphael-dupre
- ORCID : 0000-0001-7935-8221
- IdRef : 165334010
H. Egiyan
- Function : Author
- PersonId : 755392
- ORCID : 0000-0002-5881-3616
A. El Alaoui
- Function : Author
L. El Fassi
- Function : Author
L. Elouadrhiri
- Function : Author
P. Eugenio
- Function : Author
G. Fedotov
- Function : Author
S. Fegan
- Function : Author
- PersonId : 740343
- IdHAL : stephen-fegan
- IdRef : 253133149
J.A. Fleming
- Function : Author
G.P. Gilfoyle
- Function : Author
- PersonId : 755259
- ORCID : 0000-0002-5497-8309
K.L. Giovanetti
- Function : Author
W. Gohn
- Function : Author
E. Golovatch
- Function : Author
R.W. Gothe
- Function : Author
- PersonId : 755539
- ORCID : 0000-0001-9833-3695
K.A. Griffioen
- Function : Author
K. Hafidi
- Function : Author
H. Hakobyan
- Function : Author
K. Hicks
- Function : Author
M. Holtrop
- Function : Author
- PersonId : 755237
- ORCID : 0000-0002-1110-1152
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
- Function : Author
- PersonId : 755224
- ORCID : 0000-0002-2608-1270
M. Khandaker
- Function : Author
- PersonId : 755252
- ORCID : 0000-0003-0370-9536
W. Kim
- Function : Author
S. Koirala
- Function : Author
V. Kubarovsky
- Function : Author
S.V. Kuleshov
- Function : Author
P. Lenisa
- Function : Author
- PersonId : 769648
- ORCID : 0000-0003-3509-1240
H.Y. Lu
- Function : Author
I.J.D. Macgregor
- Function : Author
- PersonId : 762745
- ORCID : 0000-0002-8005-9787
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
- Function : Author
- PersonId : 755398
- ORCID : 0000-0002-4557-1320
R.A. Montgomery
- Function : Author
E. Munevar
- Function : Author
P. Nadel-Turonski
- Function : Author
I. Niculescu
- Function : Author
M. Osipenko
- Function : Author
- PersonId : 755399
- ORCID : 0000-0001-9618-3013
L.L. Pappalardo
- Function : Author
E. Pasyuk
- Function : Author
- PersonId : 755395
- ORCID : 0000-0003-3877-1815
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
- Function : Author
- PersonId : 755184
- ORCID : 0000-0001-8632-7538
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
E. Voutier
- Function : Author
- PersonId : 749688
- IdHAL : eric-voutier
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
- Function : Author
- PersonId : 760627
- ORCID : 0000-0001-7621-5612
L. Zana
- Function : Author
- PersonId : 755516
- ORCID : 0000-0002-1434-052X
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.