Abstract
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(-).
Published in:
Physical Review Letters 94,19 (2005) 121802;
Link to original published article:
http://dx.doi.org/10.1103/PhysRevLett.94.191801
Keywords
effective field-theory;; quark effective theory;; radiative-corrections;; heavy quarks;; detector;; mesons
Date of Version
January 2005
Recommended Citation
Hinson, J. W.; Huang, G. S.; Lee, J.; Miller, D. H.; Pavlunin, V.; Rangarajan, R.; Sanghi, B.; Shibata, E. I.; Shipsey, I. P. J.; Cronin-Hennessy, D.; Park, C. S.; Park, W.; Thayer, J. B.; Thorndike, E. H.; Coan, T. E.; Gao, Y. S.; Liu, F.; Stroynowski, R.; Artuso, M.; Boulahouache, C.; Blusk, S.; Dambasuren, E.; Dorjkhaidav, O.; Mountain, R.; Muramatsu, H.; Nandakumar, R.; Skwarnicki, T.; Stone, S.; Wang, J. C.; Csorna, S. E.; Danko, I.; Bonvicini, G.; Cinabro, D.; Dubrovin, M.; McGee, S.; Bornheim, A.; Lipeles, E.; Pappas, S. P.; Shapiro, A.; Sun, W. M.; Weinstein, A. J.; Briere, R. A.; Chen, G. P.; Ferguson, T.; Tatishvili, G.; Vogel, H.; Watkins, M. E.; Adam, N. E.; Alexander, J. P.; Berkelman, K.; Boisvert, V.; Cassel, D. G.; Duboscq, J. E.; Ecklund, K. M.; Ehrlich, R.; Galik, R. S.; Gibbons, L.; Gittelman, B.; Gray, S. W.; Hartill, D. L.; Heltsley, B. K.; Hsu, L.; Jones, C. D.; Kandaswamy, J.; Kreinick, D. L.; Magerkurth, A.; Mahlke-Kruger, H.; Meyer, T. O.; Mistry, N. B.; Patterson, J. R.; Peterson, D.; Pivarski, J.; Richichi, S. J.; Riley, D.; Sadoff, A. J.; Schwarthoff, H.; Shepherd, M. R.; Thayer, J. G.; Urner, D.; Wilksen, T.; Warburton, A.; Weinberger, M.; Athar, S. B.; Avery, P.; Breva-Newell, L.; Potlia, V.; Stoeck, H.; Yelton, J.; Benslama, K.; Cawlfield, C.; Eisenstein, B. I.; Gollin, G. D.; Karliner, I.; Lowrey, N.; Plager, C.; Sedlack, C.; Selen, M.; Thaler, J. J.; Williams, J.; Edwards, K. W.; Besson, D.; Anderson, S.; Frolov, V. V.; Gong, D. T.; Kubota, Y.; Li, S. Z.; Poling, R.; Smith, A.; Stepaniak, C. J.; Urheim, J.; Metreveli, Z.; Seth, K. K.; Tomaradze, A.; Zweber, P.; Ahmed, S.; Alam, M. S.; Ernst, J.; Jian, L.; Saleem, M.; Wappler, F.; Arms, K.; Eckhart, E.; Gan, K. K.; Gwon, C.; Honscheid, K.; Kagan, H.; Kass, R.; Pedlar, T. K.; von Toerne, E.; Severini, H.; Skubic, P.; Dytman, S. A.; Mueller, J. A.; Nam, S.; and Savinov, V., "Improved measurement of the form factors in the decay Lambda(+)(c) -> Lambda e(+)nu(e)" (2005). Department of Physics and Astronomy Faculty Publications. Paper 164.
https://docs.lib.purdue.edu/physics_articles/164