Properties of the Lambda(1670)(1-)/2 resonance.
Recently the Crystal Ball Collaboration measured precise new data for the near-threshold reaction K(-)p-->etaLambda, which is dominated by formation of the Lambda(1670)1 / 2(-). In this Letter, we present results of a unitary, multichannel analysis that incorporates the new Crystal Ball data. For our preferred fit, we obtain mass M = 1673+/-2 MeV, width Gamma = 23+/-6 MeV, and elasticity x = 0.37+/-0.07. This elasticity is significantly larger than previously recognized. Resonance parameters of our preferred fit are in striking agreement with the quark-model predictions of Koniuk and Isgur.
Manley
D M
DM
Kent State University, Kent, Ohio 44242-0001, USA.
Abaev
V V
VV
Allgower
C E
CE
Bekrenev
V
V
Briscoe
W J
WJ
Clajus
M
M
Comfort
J R
JR
Craig
K
K
Grosnick
D
D
Isenhower
D
D
Knecht
N
N
Koetke
D D
DD
Kulbardis
A A
AA
Kozlenko
N G
NG
Kruglov
S
S
Lolos
G
G
Lopatin
I V
IV
Manweiler
R
R
Marusić
A
A
McDonald
S
S
Nefkens
B M K
BM
Olmsted
J
J
Papandreou
Z
Z
Peaslee
D C
DC
Phaisangittisakul
N
N
Prakhov
S
S
Price
J W
JW
Ramirez
A F
AF
Sadler
M
M
Shafi
A
A
Spinka
H
H
Stanislaus
T D S
TD
Starostin
A
A
Staudenmaier
H M
HM
Strakovsky
I I
II
Supek
I
I
Tippens
W B
WB