A precise measurement of the cross section of the inverse muon decay ? µ + e - › µ - + ? e

Vilain P., Wilquet G., Beyer R., Flegel W., Grote H., Mouthuy T., ...More

PHYSICS LETTERS B, vol.364, pp.121-126, 1995 (SCI-Expanded)

  • Publication Type: Article / Article
  • Volume: 364
  • Publication Date: 1995
  • Journal Name: PHYSICS LETTERS B
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.121-126
  • Istanbul University Affiliated: Yes

Abstract

We report our final results from the analysis of the full high statistics sample of events of the reaction νμ + e−→ μ− + νc collected with the CHARM II detector in the CERN wide-band neutrino beam during the years 1988 to 1991. From a signal of 15758 ± 324 inverse muon decay events we derived, inthe Born approximation, a value of (16.51 ± 0.93) × 10−42 cm2 GeV−1 for the asymptotic cross section slope View the MathML source, in goodagreement with the Standard Model prediction of 17.23 × 10−42 cm2 GeV−1. The result constrains the scalar coupling of the electron and the muon to |gLLS|2 < 0.475 at 90% CL.