Beta spectrum of unique first-forbidden decays as a novel test for fundamental symmetries

• DOI: 10.1016/j.physletb.2017.02.023
• Publication Date: 2017-02-15T02:01:50Z
• Authors: Ayala Glick-Magid; Yonatan Mishnayot; Ish Mukul; Michael Hass; Sergey Vaintraub; Guy Ron; Doron Gazit
• Keywords: Weak interaction; Parity (physics); Helicity; Beta decay; Anomaly (physics)

Within the Standard Model, weak interaction of quarks and leptons is characterized by certain symmetry properties, such as maximal breaking parity favored helicity. These are related to $V-A$ structure interaction. characteristics were discovered studying correlations in directions outgoing nuclear beta decays. days, correlation measurements decays intensively studied probe for signatures deviations from these symmetries, which an indication Beyond Model physics. We show that energy spectrum emitted electrons unique first-forbidden $\beta$-decays sensitive symmetries interaction, thus can be used a novel physics beyond standard model. Furthermore, gives constraints both case right left coupling new currents. measurement with modest resolution about 20 keV expected lead on model interactions tensor symmetry.