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New measurement of the K-+/- -> pi(+/-)mu(+)mu(-) decay

Research output: Contribution to journalArticle

  • J. R. Batley
  • G. Kalmus
  • C. Lazzeroni
  • D. J. Munday
  • M. W. Slater
  • S. A. Wotton
  • R. Arcidiacono
  • G. Bocquet
  • N. Cabibbo
  • A. Ceccucci
  • D. Cundy
  • V. Falaleev
  • M. Fidecaro
  • L. Gatignon
  • A. Gonidec
  • W. Kubischta
  • A. Norton
  • A. Maier
  • M. Patel
  • A. Peters
  • S. Balev
  • P. L. Frabetti
  • E. Goudzovski
  • P. Hristov
  • V. Kekelidze
  • V. Kozhuharov
  • L. Litov
  • D. Madigozhin
  • E. Marinova
  • N. Molokanova
  • I. Polenkevich
  • Yu. Potrebenikov
  • S. Stoynev
  • A. Zinchenko
  • E. Monnier
  • E. Swallow
  • R. Winston
  • P. Rubin
  • A. Walker
  • W. Baldini
  • A. Cotta Ramusino
  • P. Dalpiaz
  • C. Damiani
  • M. Fiorini
  • A. Gianoli
  • M. Martini
  • F. Petrucci
  • M. Savrie
  • M. Scarpa
  • H. Wahl
  • NA48 2 Collaboration

Related Edinburgh Organisations

Original languageEnglish
Pages (from-to)107-115
Number of pages9
JournalPhysics Letters B
Volume697
Issue number2
DOIs
Publication statusPublished - 28 Feb 2011

Abstract

A sample of 3120 K-+/- -> pi(+/-)mu(+)mu(-) decay candidates with (3.3 +/- 0.7)% background contamination has been collected by the NA48/2 experiment at the CERN SPS, allowing a detailed study of the decay properties. The branching ratio was measured to be BR = (9.62 +/- 0.25) x 10(-8). The form factor W(z), where z = (M-mu mu/M-K)(2), was parameterized according to several models. In particular, the slope of the linear form factor W(z) = W-0(1 + delta z) was measured to be delta = 3.11 +/- 0.57. Upper limits of 2.9 x 10(-2) and 2.3 x 10(-2) on possible charge asymmetry and forward-backward asymmetry were established at 90% CL. An upper limit BR(K-+/- -> pi(-/+)mu(+/-)mu(+/-)) < 1.1 x 10(-9) was established at 90% CL for the rate of the lepton number violating decay. (C) 2011 Elsevier B.V. All rights reserved.

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