Neutron Lifetime Puzzle

Session

Opening Session: Welcome and Introduction

13 Sept 2025, 09:00

WHGA/001 - Auditorium (PSI)

Conveners

Opening Session: Welcome and Introduction

• Dieter Achim Ries (PSI - Paul Scherrer Institut)

16. Welcome & Introduction

Bernhard Lauss (PSI - Paul Scherrer Institut)

13/09/2025, 09:00

oral

13. The Neutron Lifetime: Why do we keep measuring it?, Why do we keep getting it “wrong”?

Geoffrey Greene (University of Tennessee)

13/09/2025, 09:10

invited

.

17. Addressing the neutron lifetime anomaly with correlation parameters

Bastian Märkisch (Technische Universität München)

13/09/2025, 09:40

invited

Combining measurements of the lifetime with measurements of (angular) correlation parameters in neutron beta decay, we strive to most precisely determine the matrix element $V_\mathrm{ud}$ of the CKM quark mixing matrix. The goal is to test CKM unitarity on the $10^{-4}$ level.

Alternatively, combining the determination of $V_\mathrm{ud}$ from superallowed nuclear decays and neutron...