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Precision measurement of the ratio BR(K-S -> pi(+)pi(-)e(+)e(-))/BR(K-L -> pi(+)pi(-)pi(0)(D))

Research output: Contribution to journalArticle

  • J. R. Batley
  • G. E. Kalmus
  • C. Lazzeroni
  • D. J. Munday
  • M. Patel
  • M. W. Slater
  • S. A. Wotton
  • R. Arcidiacono
  • G. Bocquet
  • A. Ceccucci
  • D. Cundy
  • N. Doble
  • V. Falaleev
  • L. Gatignon
  • A. Gonidec
  • R. Grafstroem
  • W. Kubischta
  • F. Marchetto
  • I. Mikulec
  • A. Norton
  • B. Panzer-Steindel
  • P. Rubin
  • H. Wahl
  • E. Goudzovski
  • P. Hristov
  • V. Kekelidze
  • V. Kozhuharov
  • L. Litov
  • D. Madigozhin
  • N. Molokanova
  • Yu. Potrebenikov
  • S. Stoynev
  • A. Zinchenko
  • E. Monnier
  • E. C. Swallow
  • R. Winston
  • R. Sacco
  • W. Baldini
  • P. Dalpiaz
  • P. L. Frabetti
  • A. Gianoli
  • M. Martini
  • F. Petrucci
  • M. Savrie
  • M. Scarpa
  • M. Calvetti
  • G. Collazuol
  • E. Iacopini
  • G. Ruggiero
  • A. Bizzeti
  • M. Lenti
  • M. Veltri
  • M. Behler
  • K. Eppard
  • M. Eppard
  • A. Hirstius
  • K. Kleinknecht
  • U. Koch
  • P. Marouelli
  • L. Masetti
  • U. Moosbrugger
  • C. Morales Morales
  • A. Peters
  • R. Wanke
  • A. Winhart
  • A. Dabrowski
  • T. Fonseca Martin
  • M. Szleper
  • M. Velasco
  • G. Anzivino
  • E. Imbergamo
  • G. Lamanna
  • P. Lubrano
  • A. Michetti
  • A. Nappi
  • M. Piccini
  • M. Valdata-Nappi
  • P. Cenci
  • M. Pepe
  • M. C. Petrucci
  • C. Cerri
  • R. Fantechi
  • I. Mannelli
  • F. Costantini
  • L. Fiorini
  • S. Giudici
  • G. Pierazzini
  • M. Sozzi
  • C. Cheshkov
  • J. B. Cheze
  • M. De Beer
  • P. Debu
  • G. Gouge
  • G. Marel
  • E. Mazzucato
  • B. Peyaud
  • B. Vallage
  • M. Holder
  • A. Maier
  • M. Ziolkowski
  • C. Biino
  • N. Cartiglia
  • M. Clemencic
  • S. Goy Lopez
  • E. Menichetti
  • N. Pastrone
  • W. Wislicki
  • H. Dibon
  • M. Jeitler
  • M. Markytan
  • G. Neuhofer
  • L. Widhalm

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Original languageEnglish
Pages (from-to)301-309
Number of pages9
JournalPhysics Letters B
Volume694
Issue number4-5
DOIs
Publication statusPublished - 3 Jan 2011

Abstract

The K-S -> pi(+)pi(-)e(+)e(-) decay mode was investigated using the data collected in 2002 by the NA48/1 Collaboration. With about 23 k K-S -> pi(+)pi(-)e(+)e(-) events and 59 k K-L -> pi(+)pi(-)pi(0)(D) normalization decays, the K-S -> pi(+)pi(-)e(+)e(-) branching ratio relative to the K-L -> pi(+)pi(-)pi(0)(D) one was determined to be BR(K-S -> pi(+)pi(-)e(+)e(-))/BR(K-L -> pi(+)pi(-)pi(0)(D)) = (3.28 +/- 0.06(stat) +/- 0.04(syst)) x 10(-2). This result was used to set the upper limit vertical bar g(E1)/g(BR)vertical bar < 3.0 at 90% CL on the presence, in the decay amplitude, of an E1 direct emission (g(E1)) term relative to the dominant inner bremsstrahlung (g(BR)) term. The CP-violating asymmetry A(phi) in the sin phi cos phi distribution of K-S -> pi(+)pi(-)e(+)e(-) events, where phi is the angle between the pi(+)pi(-) and the e(+)e(-) decay planes in the kaon centre of mass, was found to be A(phi) = (-0.4 +/- 0.8)%, consistent with zero. These results are in good agreement with a description of the K-S -> pi(+)pi(-)e(+)e(-) decay amplitude dominated by the CF-even inner bremsstrahlung process. (C) 2010 Elsevier B.V. All rights reserved.

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