Improved measurement of the form factors in the decay lambda+c-->lambda + nue. Academic Article uri icon

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(-)(c) and find no evidence for CP violation: A(lambda(c)) = (alpha(lambda(c)) + alpha (lambda(c)))/(alpha(lambda(c))-alpha(lambda(c))) = 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 ppi(-).

published proceedings

  • Phys Rev Lett

author list (cited authors)

  • Hinson, J. W., Huang, G. S., Lee, J., Miller, D. H., Pavlunin, V., Rangarajan, R., ... CLEO Collaboration.

citation count

  • 27

complete list of authors

  • Hinson, JW||Huang, GS||Lee, J||Miller, DH||Pavlunin, V||Rangarajan, R||Sanghi, B||Shibata, EI||Shipsey, IPJ||Cronin-Hennessy, D||Park, CS||Park, W||Thayer, JB||Thorndike, EH||Coan, TE||Gao, YS||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, JC||Csorna, SE||Danko, I||Bonvicini, G||Cinabro, D||Dubrovin, M||McGee, S||Bornheim, A||Lipeles, E||Pappas, SP||Shapiro, A||Sun, WM||Weinstein, AJ||Briere, RA||Chen, GP||Ferguson, T||Tatishvili, G||Vogel, H||Watkins, ME||Adam, NE||Alexander, JP||Berkelman, K||Boisvert, V||Cassel, DG||Duboscq, JE||Ecklund, KM||Ehrlich, R||Galik, RS||Gibbons, L||Gittelman, B||Gray, SW||Hartill, DL||Heltsley, BK||Hsu, L||Jones, CD||Kandaswamy, J||Kreinick, DL||Magerkurth, A||Mahlke-Kr├╝ger, H||Meyer, TO||Mistry, NB||Patterson, JR||Peterson, D||Pivarski, J||Richichi, SJ||Riley, D||Sadoff, AJ||Schwarthoff, H||Shepherd, MR||Thayer, JG||Urner, D||Wilksen, T||Warburton, A||Weinberger, M||Athar, SB||Avery, P||Breva-Newell, L||Potlia, V||Stoeck, H||Yelton, J||Benslama, K||Cawlfield, C||Eisenstein, BI||Gollin, GD||Karliner, I||Lowrey, N||Plager, C||Sedlack, C||Selen, M||Thaler, JJ||Williams, J||Edwards, KW||Besson, D||Anderson, S||Frolov, VV||Gong, DT||Kubota, Y||Li, SZ||Poling, R||Smith, A||Stepaniak, CJ||Urheim, J||Metreveli, Z||Seth, KK||Tomaradze, A||Zweber, P||Ahmed, S||Alam, MS||Ernst, J||Jian, L||Saleem, M||Wappler, F||Arms, K||Eckhart, E||Gan, KK||Gwon, C||Honscheid, K||Kagan, H||Kass, R||Pedlar, TK||von Toerne, E||Severini, H||Skubic, P||Dytman, SA||Mueller, JA||Nam, S||Savinov, V

publication date

  • May 2005