Measurement of the branching ratio of the decay KL→ π±e∓ν and extraction of the CKM parameter |Vus|

Measurement of the branching ratio of the decay KL→ π±e∓ν and extraction of the CKM parameter |Vus|

We present a new measurement of the branching ratio R of the decay K L→ pi;±e∓ν, denoted as Ke3, relative to all charged KL 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 Ke3 branching fraction and the weak cou...

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প্রধান লেখক: Lai, A, Marras, D, Bevan, A, Dosanjh, R, Gershon, T, Hay, B, Kalmus, G, Lazzeroni, C, Munday, D, Olaiya, E, Parker, M, White, T, Wotton, SA, Barr, G, Bocquet, G, Ceccucci, A, Cuhadar-Dönszelmann, T, Cundy, D, D'Agostini, G, Doble, N, Falaleev, V, Gatignon, L, Gonidec, A, Gorini, B, Govi, G
বিন্যাস: Journal article
ভাষা:English
প্রকাশিত: 2004
বিবরন
সংক্ষিপ্ত:We present a new measurement of the branching ratio R of the decay K L→ pi;±e∓ν, denoted as Ke3, relative to all charged KL 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 Ke3 branching fraction and the weak coupling parameter |Vus| in the CKM matrix. We obtain |Vus|f+(0)=0. 2146±0.0016, where f+(0) is the vector form factor in the Ke3 decay. © 2004 Published by Elsevier B.V.

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