Year: 2024
Type: preprint
Abstract: Pion $β$ decay, $π^+ \toπ^0 e^+ ν_e$, offers a pristine way to measure the CKM matrix element $V_{ud}$ in a purely mesonic system, with excellent control over the hadronic matrix elements. We review the physics goals and current status of the PIONEER experiment, which aims at major improvements in the branching fractions for the $π^+\to e^+ ν_e$ decay in Phase I and for pion $β$ decay in Phases II and III of its experimental program, potentially leading to a measurement of $V_{ud}$ competitive with determinations from $β$ decays involving nucleons.
Source: arXiv (Cornell University)
Author: Hoferichter, Martin
Institution: University of Bern
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4393335191
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