Beta-Decay Correlations in the LHC Era

TL;DR

This paper discusses a proposed experiment to measure 11 neutron beta decay correlation coefficients, including five previously unmeasured, using silicon pixel detectors to improve sensitivity to exotic scalar and tensor interactions beyond the Standard Model.

Contribution

It introduces a new experimental approach measuring 11 correlation coefficients, with five being novel, and evaluates silicon pixel detectors as an alternative to traditional electron tracking methods.

Findings

Expected sensitivity limits for EFT parameters $\\epsilon_S$ and $\epsilon_T$ are discussed.

Five new correlation coefficients ($H$, $L$, $S$, $U$, $V$) are addressed for the first time.

Silicon pixel detectors are proposed as promising tools for improved measurements.

Abstract

Neutron and nuclear beta decay correlation coefficients are linearly sensitive to the exotic scalar and tensor interactions that are not included in the Standard Model. The proposed experiment will measure simultaneously 11 neutron correlation coefficients ($a$, $A$, $B$, $D$, $H$, $L$, $N$, $R$, $S$, $U$, $V$) where 5 of them ($H$, $L$, $S$, $U$, $V$) were never addressed before. Silicon pixel detectors are considered as promising alternative to multi-wire gas chambers devoted for electron tracking in the original setup. The expected sensitivity limits for $\epsilon_S$ and $\epsilon_T$ -- EFT parameters describing the scalar and tensor contributions to be extracted from the transverse electron polarization related coefficients $H$, $L$, $N$, $R$, $S$, $U$, $V$ are discussed.