Positron-neutrino correlation in the 0^+ \to 0^+ decay of ^{32}Ar
E. G. Adelberger, C. Ortiz, A. Garcia, H. E. Swanson, M. Beck, O., Tengblad, M. J. G. Borge, I. Martel, H. Bichsel, and the ISOLDE Collaboration
TL;DR
This study measures the positron-neutrino correlation in the decay of ^{32}Ar to test the Standard Model and constrain scalar weak interactions, achieving results consistent with theoretical predictions.
Contribution
The paper provides a precise measurement of the positron-neutrino correlation in ^{32}Ar decay, offering improved limits on scalar interactions beyond the Standard Model.
Findings
Result consistent with Standard Model prediction
Improved constraints on scalar weak interactions
Precise measurement of positron-neutrino correlation
Abstract
The positron-neutrino correlation in the decay of Ar was measured at ISOLDE by analyzing the effect of lepton recoil on the shape of the narrow proton group following the superallowed decay. Our result is consistent with the Standard Model prediction. For vanishing Fierz interference we find , which yields improved constraints on scalar weak interactions.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Neutrino Physics Research · Quantum Chromodynamics and Particle Interactions