Measurement of differential cross-sections for muon-neutrino electron scattering

The CHARM-II collaboration Vilain, P. ; Wilquet, G. ; Beyer, R. ; et al.
Phys.Lett.B 302 (1993) 351-355, 1993.
Inspire Record 354904 DOI 10.17182/hepdata.16131

We report on a study of the differential cross section d σ /d y for the processes of elastic ν μ - and ν μ - electron scattering. The data on which this analysis is based were recorded between 1987 and 1990 with the CHARM II detector in the wide band neutrino beam at the CERN-SPS. For the first time the shapes of these y -distributions have been determined in a model-independent way. A fit to the data yields for the squares of the neutral coupling constants the ratio g R 2 / g L 2 =0.60 ± 0.19 (stat.) ± 0.09 (syst.).

3 data tables

Cross sections in arbitrary units.

Cross sections in arbitrary units.

Value of SIN2TW obtained from data.


An Improved determination of the electroweak mixing angle from muon-neutrino electron scattering

The CHARM-II collaboration Geiregat, D. ; Vilain, P. ; Wilquet, G. ; et al.
Phys.Lett.B 259 (1991) 499-507, 1991.
Inspire Record 314000 DOI 10.17182/hepdata.18515

We are reporting an improved determination of the electroweak mixing angle sin 2 Θ w from the ratio of ν μ e to ν μ e scattering cross sections. The CHARM II detector was exposed to neutrino and antineutrino wide band beams at the 450 GeV CERN SPS. Including new data collected in 1989 we have obtained 1316 ± 56 ν μ e and 1453 ± 62 ν μ e events. From the ratio of the visible cross sections we determined sin 2 Θ 0 =0.239 ± 0.009(stat) ± 0.007(syst) without radiative corrections and g V e g A e =0.047 ± 0.046 . Combining this last result with recent results on g A e at LEP we obtain g V e = −0.023 ± 0.023.

5 data tables

Systematic error presented includes error from flux normalization 'F'=1.030+- 0.022, no detaled description of the other sources and of the combination pr ocedure.. 'F'.

Without radiative corrections, systematic error combined in quadrature fromconponents listed under SYSTEMATICS.

With radiative corrections as defined by Marciano-Sirlin scheme, see Phys.Rev.D22(1980)2695, Phys.Rev.Lett.46(1981)163, Phys.Rev.D29(1984)945, Phys.Rev.D31(1985)213E, Nucl.Phys.B217(1983)84. CENTRAL VALUE IS FOR M(TOP)=100 GEV, M(HIGGS)=100 GEV.

More…