Comment on Plaga’s Analysis of Neutrino Scattering Charm Ii Data
نویسنده
چکیده
Recently Plaga [1] claimed that the existence of a vector coupling of neutrinos in neutral currents, observed in the Charm II collaboration [2], led to the conclusion that neutrinos were Dirac particles. Although he successfully defended [1, 3] some of his assertions, his claim that Charm II data inevitably required Dirac neutrinos is not necessarily correct. Namely, Charm II data are fitted with the Standard Model, thus supposing no flavour mixing of leptons. Solar and atmosphericneutrino, as well as LSND neutrino [4] measurements suggest the existence of neutrino flavour mixing. One should fit the Charm II data including also the charged-current contribution in the electronμ-neutrino scattering. Following ’t Hooft [5], one can immediately find the effective couplings for Dirac neutrinos:
منابع مشابه
Bounds on the tau and muon neutrino vector and axial vector charge radius
A Majorana neutrino is characterized by just one flavor diagonal electromagnetic form factor: the anapole moment, that in the static limit corresponds to the axial vector charge radius 〈 r2 A 〉 . Experimental information on this quantity is scarce, especially in the case of the tau neutrino. We present a comprehensive analysis of the available data on the single photon production process e+e− →...
متن کاملComment on Recent Argument That Neutrinos Are Not Majorana Particles
Existing data on neutrino-electron scattering do not imply that neutrinos are not Majorana particles. The question of whether neutrinos are of Majorana or of Dirac character remains completely open. Recently, it has been argued that existing data imply that neutrinos are not Majorana particles. The argument is as follows: 1. If some neutrino is a Majorana particle, then its vector neutral curre...
متن کاملNeutral current coupling constants from neutrino- and antineutrino-electron scattering
We are reporting on a determination of neutral current coupling constants from a study of differential cross sections of muon(anti)neutrino-electron scattering. The results were obtained with the CHARM-II detector which was exposed to the CERN wide band neutrino beam in the years 1987-1990. A total of about 2100 ve and 2200 ve scattering events were observed. From a comparison between the data ...
متن کاملA New Global Analysis of Deep Inelastic Scattering Data
A new QCD analysis of Deep Inelastic Scattering (DIS) data is presented. All available neutrino and anti-neutrino cross sections are reanalysed and included in the fit, along with charged-lepton DIS and Drell-Yan data. A massive factorisation scheme is used to describe the charm component of the structure functions. Next-to-leading order parton distribution functions are provided. In particular...
متن کاملOn the neutrino vector and axial vector charge radius
A Majorana neutrino is characterized by just one flavor diagonal electromagnetic form factor: the anapole moment, that in the static limit corresponds to the axial vector charge radius 〈 r2 A 〉 . As is the case for the vector charge radius of a Dirac neutrino, proving that this quantity is a well defined physical quantity is non trivial. I will first describe briefly the origin of the long stan...
متن کامل