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New limits on fundamental weak-interaction parameters from superallowed beta decay.

J C Hardy¹, I S Towner

¹Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA.

Physical Review Letters

|March 24, 2005

Summary

Superallowed beta decays offer precise tests of the weak interaction, confirming the conserved vector current hypothesis. This data yields a highly accurate value for the CKM matrix element V(ud), constraining theories beyond the Standard Model.

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Area of Science:

Nuclear Physics
Particle Physics
Standard Model Tests

Background:

Superallowed beta decays are sensitive probes of fundamental symmetries.
Previous studies established constraints on weak interaction parameters.

Purpose of the Study:

To provide stringent tests of the weak interaction using a comprehensive dataset.
To precisely determine fundamental constants and matrix elements.
To constrain extensions to the Standard Model, such as right-hand currents.

Main Methods:

Compilation and analysis of all available world data on superallowed beta decays.
Application of the conserved vector current (CVC) hypothesis.
Calculation of the up-down (ud) element of the Cabibbo-Kobayashi-Maskawa (CKM) matrix.

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Main Results:

The vector coupling constant G(V) is constant to better than 3x10^-4.
Induced scalar and fundamental scalar currents are limited to |f(S)|<=0.0013 and |C(S)/C(V)|<=0.0013, respectively.
The CKM matrix element V(ud) is determined to be 0.9738(4).

Conclusions:

The results strongly support the conserved vector current hypothesis.
CKM unitarity is tested with high precision, showing consistency with the Standard Model.
The data place significant constraints on the possible existence of right-hand currents.