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

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. DobleV. Falaleev, L. Gatignon, A. Gonidec, B. Gorini, G. Govi, P. Grafström, W. Kubischta, A. Lacourt, A. Norton, S. Palestini, B. Panzer-Steindel, H. Taureg, M. Velasco, H. Wahl, C. Cheshkov, A. Gaponenko, P. Hristov, V. Kekelidze, L. Litov, D. Madigojine, N. Molokanova, Y. Potrebenikov, S. Stoynev, G. Tatishvili, A. Tkatchev, A. Zinchenko, I. Knowles, V. Martin, R. Sacco, A. Walker, M. Contalbrigo, P. Dalpiaz, J. Duclos, P. L. Frabetti, A. Gianoli, M. Martini, F. Petrucci, M. Savrié, A. Bizzeti, M. Calvetti, G. Collazuol, G. Graziani, E. Iacopini, M. Lenti, F. Martelli, M. Veltri, H. G. Becker, K. Eppard, M. Eppard, H. Fox, A. Kalter, K. Kleinknecht, U. Koch, L. Köpke, P. Lopes da Silva, P. Marouelli, I. Pellmann, A. Peters, B. Renk, S. A. Schmidt, V. Schönharting, Y. Schué, R. Wanke, A. Winhart, M. Wittgen, J. C. Chollet, L. Fayard, L. Iconomidou-Fayard, J. Ocariz, G. Unal, I. Wingerter-Seez, G. Anzivino, P. Cenci, E. Imbergamo, P. Lubrano, A. Mestvirishvili, A. Nappi, M. Pepe, M. Piccini, R. Casali, C. Cerri, M. Cirilli, F. Costantini, R. Fantechi, L. Fiorini, S. Giudici, G. Lamanna, I. Mannelli, G. Pierazzini, M. Sozzi, J. B. Cheze, J. Cogan, M. de Beer, P. Debu, A. Formica, R. Granier de Cassagnac, E. Mazzucato, B. Peyaud, R. Turlay, B. Vallage, M. Holder, A. Maier, M. Ziolkowski, R. Arcidiacono, C. Biino, N. Cartiglia, R. Guida, F. Marchetto, E. Menichetti, N. Pastrone, J. Nassalski, E. Rondio, M. Szleper, W. Wislicki, S. Wronka, H. Dibon, G. Fischer, M. Jeitler, M. Markytan, I. Mikulec, G. Neuhofer, M. Pernicka, A. Taurok, L. Widhalm

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Abstract

We present a new measurement of the branching ratio R of the decay K L→ pi;±eν, 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.

Original languageEnglish (US)
Pages (from-to)41-51
Number of pages11
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume602
Issue number1-2
DOIs
StatePublished - Nov 18 2004

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Lai, A., Marras, D., Bevan, A., Dosanjh, R. S., Gershon, T. J., Hay, B., Kalmus, G. E., Lazzeroni, C., Munday, D. J., Olaiya, E., Parker, M. A., White, T. O., Wotton, S. A., Barr, G., Bocquet, G., Ceccucci, A., Cuhadar-Dönszelmann, T., Cundy, D., D'Agostini, G., ... Widhalm, L. (2004). Measurement of the branching ratio of the decay KL→ π±eν and extraction of the CKM parameter |Vus|. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 602(1-2), 41-51. https://doi.org/10.1016/j.physletb.2004.09.056