Improved Measurement Of The Form Factors In The Decay Lambda(+)(C) -> Lambda E(+)Nu(E)

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,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, R. Poling,A. Smith,C. J. Stepaniak,J. Urheim,C. Stepaniak, J. Urheim,Z. Metreveli,K. Seth, A. Tomaradze,P. Zweber, S. Ahmed,M. Alam, J. Ernst, L. Jian,M. Saleem,F. Wappler,K. Arms,E. Eckhart,K. Gan, C. Gwon,K. Honscheid, H. Kagan, R. Kass,T. Pedlar, E. von Toerne, H. Severini, P. Skubic,S. Dytman,J. Mueller,S. Nam, V. Savinov

PHYSICAL REVIEW LETTERS（2005）

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摘要

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(-).

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