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 ?
Kothari, Magnetics for neutral current compensation in three-phase fourwire distribution system, Int Conf on Power Electronics, Drives and Energy Systems (PEDES), 1-7, (2010).
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.
Parameters Affecting Neutral Currents in the Presence of Harmonics
The neutral current measurement offered by the new device enables designers to develop more tamper-resistant smart meters, which are invaluable to utility companies that are estimated to lose billions of revenue dollars worldwide each year due to electricity theft.
Tenders are invited for Design, Manufacture and supply and commissioning 550v 750MA restricted neutral grounding system consisting PI wire wound resistance solid state NGR monitoring fail safe relay solid state earth leakage relay resin cast neutral current transformer, power pack unit, instrument transformer, buzzer with all necessary accessories.
Tenders are invited for Supply of 110kv and 66kv neutral current transformers
Limited Tenders are invited for 1)Outdoor Neutral Current Transformer Item 01.
Neutral Current Transformer As Per Annexure Enclosed Qty: 6 No
The main objective of this proposal is the study of rare flavour changing neutral current transitions in b-hadrons, where a b-quark decays to an s- or d-quark and a pair of muons.
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 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.