First observation of the decay K⁺-->e⁺nu_eµ⁺µ^-

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H. Ma,¹ R. Appel,^6,3 G. S. Atoyan,⁴ B. Bassalleck,² D. R. Bergman,⁶ N. Cheung,³ S. Dhawan,⁶ H. Do,⁶ J. Egger,⁵ S. Eilerts,² W. Herold,⁵ V. V. Issakov,⁴ H. Kaspar,⁵ D. E. Kraus,³ D. M. Lazarus,¹ P. Lichard,³ J. Lowe,² J. Lozano,⁶ W. Majid,⁶ S. Pislak,^7,6 A. A. Poblaguev,⁴ P. Rehak,¹ A. Sher,³ J. A. Thompson,³ P. Truöl,^7,6 and M. E. Zeller⁶
¹Brookhaven National Laboratory, Upton, New York 11973, USA
²Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131, USA
³Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
⁴Institute for Nuclear Research of Russian Academy of Sciences, Moscow 117 312, Russia
⁵Paul Scherrer Institut, CH-5232 Villigen, Switzerland
⁶Physics Department, Yale University, New Haven, Connecticut 06511, USA
⁷Physik-Institut, Universität Zürich, CH-8057 Zürich, Switzerland

Received 12 May 2005; published 7 February 2006

Experiment865 at the Brookhaven AGS has observed the decay K⁺-->e⁺nu_eµ⁺µ^-.The branching ratio extracted is (1.72±0.37(stat)±0.17(syst)±0.19(model))×10^-8 where the third termin the error results from the use of a modelto extrapolate into a kinematic region dominated by background.

URL:	http://link.aps.org/doi/10.1103/PhysRevD.73.037101
DOI:	10.1103/PhysRevD.73.037101
PACS:	13.20.Eb; 13.40.Ks 13.20.Eb Leptonic/semileptonic decays of K mesons 13.40.Ks Electromagnetic corrections to strong- and weak-interaction processes YEAR: 2006
KEYWORDS:	kaon leptonic decay