J. W. Hinson
G. S. Huang
J. Lee
D. H. Miller
V. Pavlunin
R. Rangarajan
B. Sanghi
E. I. Shibata
I. P. J. Shipsey
D. Cronin-Hennessy
C. S. Park
W. Park
J. B. Thayer
E. H. Thorndike
T. E. Coan
Y. S. Gao
F. Liu
R. Stroynowski
M. Artuso
C. Boulahouache
S. Blusk
E. Dambasuren
O. Dorjkhaidav
R. Mountain
H. Muramatsu
R. Nandakumar
T. Skwarnicki
S. Stone
J. C. Wang
S. E. Csorna
I. Danko
G. Bonvicini
D. Cinabro
M. Dubrovin
S. McGee
A. Bornheim
E. Lipeles
S. P. Pappas
A. Shapiro
W. M. Sun
A. J. Weinstein
R. A. Briere
G. P. Chen
T. Ferguson
G. Tatishvili
H. Vogel
M. E. Watkins
N. E. Adam
J. P. Alexander
K. Berkelman
V. Boisvert
D. G. Cassel
J. E. Duboscq
K. M. Ecklund
R. Ehrlich
R. S. Galik
L. Gibbons
B. Gittelman
S. W. Gray
D. L. Hartill
B. K. Heltsley
L. Hsu
C. D. Jones
J. Kandaswamy
D. L. Kreinick
A. Magerkurth
H. Mahlke-Kruger
T. O. Meyer
N. B. Mistry
J. R. Patterson
D. Peterson
J. Pivarski
S. J. Richichi
D. Riley
A. J. Sadoff
H. Schwarthoff
M. R. Shepherd
J. G. Thayer
D. Urner
T. Wilksen
A. Warburton
M. Weinberger
S. B. Athar
P. Avery
L. Breva-Newell
V. Potlia
H. Stoeck
J. Yelton
K. Benslama
C. Cawlfield
B. I. Eisenstein
G. D. Gollin
I. Karliner
N. Lowrey
C. Plager
C. Sedlack
M. Selen
J. J. Thaler
J. Williams
K. W. Edwards
D. Besson
S. Anderson
V. V. Frolov
D. T. Gong
Y. Kubota
S. Z. Li
R. Poling
A. Smith
C. J. Stepaniak
J. Urheim
Z. Metreveli
K. K. Seth
A. Tomaradze
P. Zweber
S. Ahmed
M. S. Alam
J. Ernst
L. Jian
M. Saleem
F. Wappler
K. Arms
E. Eckhart
K. K. Gan
C. Gwon
K. Honscheid
H. Kagan
R. Kass
T. K. Pedlar
E. von Toerne
H. Severini
P. Skubic
S. A. Dytman
J. A. Mueller
S. Nam
V. Savinov

Published in:

Physical Review Letters 94,19 (2005) 121802;


Using the CLEO detector at the Cornell Electron Storage Ring, we have studied the distribution of kinematic variables in the decay Lambda(c)(+)->Lambda e(+)nu(e). By performing a four-dimensional maximum likelihood fit, we determine the form factor ratio, R=f(2)/f(1)=-0.31 +/- 0.05(stat)+/- 0.04(syst), the pole mass, M-pole=[2.21 +/- 0.08(stat)+/- 0.14(syst)] GeV/c(2), and the decay asymmetry parameter of the Lambda(c)(+), alpha(Lambda c)=-0.86 +/- 0.03(stat)+/- 0.02(syst), for < q(2)>=0.67 (GeV/c(2))(2). We compare the angular distributions of the Lambda(c)(+) and (Lambda) over bar (-)(c) and find no evidence for CP violation: A(Lambda c)=(alpha(Lambda c)+alpha((Lambda) over barc))/(alpha(Lambda c)-alpha((Lambda) over barc))=0.00 +/- 0.03(stat)+/- 0.01(syst)+/- 0.02, where the third error is from the uncertainty in the world average of the CP-violating parameter, A(Lambda), for Lambda -> p pi(-).


effective field-theory;; quark effective theory;; radiative-corrections;; heavy quarks;; detector;; mesons

Date of this Version

January 2005



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