Particle Physics with Neutrons at the ESS

Session

Precision neutron decay (1)

13 Dec 2018, 10:50

Geovetenskaps hus (room:Högbomsalen), Stockholm University

278. New Physics effects in neutron beta decay: a theory view

Martin Gonzales-Alonso

13/12/2018, 10:50

279. Precise theory predictions in neutron decay

Dr Andrzej Czarnecki

13/12/2018, 11:20

280. Precise theory predictions in neutron beta decay: current limitations and challenges

Dr Mikhail Gorshteyn

13/12/2018, 11:45

I review recent progress in calculating the hadron structure-dependent radiative corrections to the neutron beta-decay. An application of dispersion relations to the $\gamma W$-box allowed to provide a data-driven estimate of the uncertainty of this calculation, reducing the hadronic uncertainty by almost a factor 2.

281. First-principles lattice QCD calculations of the neutron beta decay: challenges and prospects

Dr Enrico Rinaldi

13/12/2018, 12:10

Measurements of the neutron lifetime and CKM matrix elements have evolved to become high-precisions tests of the existence of new physics. Thanks to the Standard Model relation between the neutron lifetime, the axial coupling $g_A$ of the neutron, and the CKM matrix element $V_{ud}$, we can use a QCD calculation of $g_A$ and $V_{ud}$ to learn about neutron decay from first-principles....