New results on inverse muon decay and coherent charged pion production by neutrinos are presented. The data come from the CHARM-II neutrino detector operated at the CERN wide-band neutrino beam. High-statistics data samples of 14500 inverse muon decay events and 3500 nu(mu)e elastic scattering events allow the determination of the electroweak parameters from the ratio of the cross-sections of neutral-to-charged-current neutrino electron scattering. The best fit values of the electroweak mixing angle sin2 theta(W) and the relative coupling strength rho of neutral and charged current are: sin2 theta(W) = 0.237 +/- 0.014 and rho = 0.987 +/- 0.042. In the second topic, coherent single charged pion production was measured in neutrino and antineutrino beams. The measured cross-sections, averaged over the wide-band beam spectra and the glass target nuclei composition, are: sigma(nu(mu)A --> mu-pi+A) = (51 +/- 10) X 10(-40) cm2 nucleus and sigma(nu(mu)ABAR --> mu+pi-A) = (43 +/- 9) x 10(-40) cm2 nucleus. The energy dependence shows the expected flattering of the cross-sections at high energy.
New Results On Inverse Muon Decay and Low Multiplicity Reactions / B., Akkus; E., Arik; R., Beyer; F. W., Busser; A., Capone; M., Caria; A. G., Cocco; D., Depedis; E., Dicapua; U., Dore; B., Eckart; A., Ereditato; D., Favart; Fiorillo, Giuliana; W., Flegel; C., Foos; A., Frenkelrambaldi; L., Gerland; P., Gorbunov; G., Gregoire; E., Grigoriev; H., Grote; K., Hiller; V., Khovansky; E., Knoops; T., Layda; V., Lemaitre; W., Lippich; P. F., Loverre; D., Macina; A., Maslennikov; T., Mouthuy; R., Nahnhauer; A., Nathaniel; F., Niebergall; H., Overas; Palladino, Vittorio; J., Panman; G., Piredda; G., Radel; S., Ricciardi; H. E., Roloff; A., Rozanov; B., Saitta; R., Santacesaria; M., Serinzeyrek; R., Sever; P., Stahelin; A., Staude; P., Strolin; P., Tolun; P., Vilain; J., Vogt; T., Voss; G., Wilquet; K., Winter; G., Zacek; V., Zacek. - In: NUCLEAR PHYSICS. B. - ISSN 0550-3213. - ELETTRONICO. - 31:(1993), pp. 293-300. [10.1016/0920-5632(93)90149-Z]
New Results On Inverse Muon Decay and Low Multiplicity Reactions
FIORILLO, GIULIANA;PALLADINO, VITTORIO;
1993
Abstract
New results on inverse muon decay and coherent charged pion production by neutrinos are presented. The data come from the CHARM-II neutrino detector operated at the CERN wide-band neutrino beam. High-statistics data samples of 14500 inverse muon decay events and 3500 nu(mu)e elastic scattering events allow the determination of the electroweak parameters from the ratio of the cross-sections of neutral-to-charged-current neutrino electron scattering. The best fit values of the electroweak mixing angle sin2 theta(W) and the relative coupling strength rho of neutral and charged current are: sin2 theta(W) = 0.237 +/- 0.014 and rho = 0.987 +/- 0.042. In the second topic, coherent single charged pion production was measured in neutrino and antineutrino beams. The measured cross-sections, averaged over the wide-band beam spectra and the glass target nuclei composition, are: sigma(nu(mu)A --> mu-pi+A) = (51 +/- 10) X 10(-40) cm2 nucleus and sigma(nu(mu)ABAR --> mu+pi-A) = (43 +/- 9) x 10(-40) cm2 nucleus. The energy dependence shows the expected flattering of the cross-sections at high energy.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
