A Precise measurement of the cross-section of the inverse muon decay muon-neutrino + e- --> mu- + electron-neutrino

The CHARM-II collaboration Vilain, P. ; Wilquet, G. ; Beyer, R. ; et al.
Phys.Lett.B 364 (1995) 121-126, 1995.
Inspire Record 415614 DOI 10.17182/hepdata.47842

We report our final results from the analysis of the full high statistics sample of events of the reaction ν μ + e − → μ − + ν c 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 cm 2 GeV −1 for the asymptotic cross section slope σ E ν , in goodagreement with the Standard Model prediction of 17.23 × 10 −42 cm 2 GeV −1 . The result constrains the scalar coupling of the electron and the muon to | g LL S | 2 < 0.475 at 90% CL.

2 data tables

23.8 is mean neutrino beam energy.

Born approximation of the asymptotic cross section slope obtained by applying radiative corrections, which amount to a 3% effect.. Error is combined statistics and systematics.. 23.8 is mean neutrino beam energy.


A New measurement of the cross-section of the inverse muon decay reaction muon-neutrino e- ---> mu- electron-neutrino

The CHARM-II collaboration Geiregat, D. ; Wilquet, G. ; Binder, U. ; et al.
Phys.Lett.B 247 (1990) 131-136, 1990.
Inspire Record 297703 DOI 10.17182/hepdata.29661

We have measured the cross section for inverse muon decay in the CERN neutrino wide band beam. From 4808 events observed in the CHARM II detector we derived for the Born term of the asymptotic cross section slope the result (18.16±1.36) × 10 −42 cm 2 GeV −1 . This cross section is in good agreement with the standard model prediction and allows to constrain the scalar coupling of the electron and muon to their neutrinos to | g LL S | 2 <0.405 at 90% CL.

1 data table

Corrected asymptotic cross section slope. Error is quadratically combined statistical and systematic.