We present a new measurement of the branching ratio R of the decay K-L --> pi(+/-) e(-/+)v, denoted as K(e)3, relative to all charged K-L decays with two tracks, based on data taken with the NA48 detector at the CERN SPS. We measure R = 0.4978 +/- 0.0035. From this we derive the K(e)3 branching fraction and the weak coupling parameter \V-us\ in the CKM matrix. We obtain \V-us\ f(+) (0) = 0.2146 +/- 0.0016, where f(+) (0) is the vector form factor in the K(e)3 decay.
Measurement of the branching ratio of the decay K-L ->pi(+/-)e(-/+)upsilon and extraction of the CKM parameter vertical bar V-us vertical bar / A. Lai, D. Marras, A. Bevan, R.S. Dosanjh, T.J. Gershon, B. Hay, G.E. Kalmus, C. Lazzeroni, D.J. Munday, E. Olaiya, M.A. Parker, T.O. White, S.A. Wotton, G. Barr, G. Bocquet, A. Ceccucci, T. Cuhadar-Dönszelmann, D. Cundy, G. D'Agostini, N. Doble, et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 602:(2004), pp. 41-51. [10.1016/j.physletb.2004.09.056]
Measurement of the branching ratio of the decay K-L ->pi(+/-)e(-/+)upsilon and extraction of the CKM parameter vertical bar V-us vertical bar
CALVETTI, MARIO;IACOPINI, ENRICO;M. Lenti;
2004
Abstract
We present a new measurement of the branching ratio R of the decay K-L --> pi(+/-) e(-/+)v, denoted as K(e)3, relative to all charged K-L decays with two tracks, based on data taken with the NA48 detector at the CERN SPS. We measure R = 0.4978 +/- 0.0035. From this we derive the K(e)3 branching fraction and the weak coupling parameter \V-us\ in the CKM matrix. We obtain \V-us\ f(+) (0) = 0.2146 +/- 0.0016, where f(+) (0) is the vector form factor in the K(e)3 decay.| File | Dimensione | Formato | |
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