Neutral currents

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Neutral currents

Exchange currents which carry no electric charge and mediate certain types of electroweak interactions. The discovery of the neutral-current weak interactions and the agreement of their experimentally measured properties with the theoretical predictions were of great significance in establishing the validity of the Weinberg-Salam model of the electroweak forces.

The electroweak forces come in three subclasses: the electromagnetic interactions, the charged-current weak interactions, and the neutral-current weak interactions. The electromagnetic interaction is mediated by an exchanged photon γ. Since the photon carries no electric charge, there is no change in charge between the incoming and the outgoing particles. The charged-current weak interaction is mediated by the exchange of a charged intermediate boson, the W+, and thus, for example, an incoming neutral lepton such as the νμ is changed into a charged lepton, the μ-. In the neutral-current weak interactions, the exchanged intermediate boson, the Z0, carries no electric charge (hence the name neutral-current interaction), and thus, for example, an incident neutral lepton, such as the νμ, remains an outgoing neutral νμ. See Electron, Intermediate vector boson, Lepton, Neutrino, Photon

The neutral-current interactions were experimentally discovered in 1973, and have since been extensively studied, in neutrino scattering processes. Very important information about the properties of the neutral currents have been obtained by studying the interference effects between the electromagnetic and the neutral-current weak interactions in the scattering of polarized electrons on deuterium. Parity-violating effects in atomic physics processes due to the neutral weak currents have been observed, and predicted parity-violating nuclear effects have been searched for. See Elementary particle, Fundamental interactions, Symmetry laws (physics), Weak nuclear interactions

References in periodicals archive ?
For the purpose of the neutral current calculation the tapping winding has been fully earthed as is done in a particular case of impulse tests.
Neutral current measurements enable meter tamper detection and improved billing accuracy.
3KV transformer sconsisting of Non Magnetic, stainless Steel grid resistance Solid State NGR Monitoring Fail Safe Relay, Solid state Earth fault Relay, Power pack Units, Resin Cast Neutral Current Transformer Resin Cast HV & LV potential Transformer, Buzzer with all necessary accessories within outdoor type Floor Mounted Panel of Hazaribagh Area.
3KV transformer consisting of Non Magnetic, stainless Steel grid resistance Solid State NGR Monitoring Fail Safe Relay, Solid state Earth fault Relay, Power pack Units, Resin Cast Neutral Current Transformer Resin Cast HV and LV potential Transformer, Buzzer with all necessary accessories within outdoor type Floor Mounted Panel of Hazaribagh Area.
3KV transformer consisting of Non Magnetic, stainless Steel grid resistance Solid State NGR Monitoring Fail Safe Relay, Solid state Earth fault Relay, Power pack Units, Resin Cast Neutral Current Transformer Resin Cast HV & LV potential Transformer, Buzzer with all necessary accessories within outdoor type Floor Mounted Panel of Hazaribagh Area.
One of the most striking results of the last decade s particle physics is the proof that at least two of the three neutrinos entering the weak charged and neutral current processes are not massless, at odds with their Weyl nature within the Standard Model of particle interactions.
European Central Bank Bias: Neutral Current Rate: 1.
1973: Discovery of neutral currents at a bubble chamber
As an advanced study of the Standard Model of particle physics, Tenchini and Verzegnassi's textbook explains most of the properties of current reactions, including Flavour Changing Neutral Currents (FCNC) and Neutral Weak Currents.
There is a likelihood that these installations also suffer from other problems such as large neutral currents, appreciable heat generation, significant losses, etc.
The NN weak interaction is also the only practical way to study quark-quark neutral currents at low energy.
1], were motivated by the unusually large sensitivity of the weak pion coupling to neutral currents, i.