EPS HEP 2015

22-29 July 2015
Europe/Vienna timezone

NoMoS: Beyond the Standard Model Physics in Neutron Decay

Jul 25, 2015, 11:50 AM
15m
HS21

HS21

talk Flavour Physics and Fundamental Symmetries

Speaker

The newly established New Frontiers Group ‘NoMoS: Beyond the Standard Model Physics in Neutron Decay’ of the Austrian Academy of Sciences aims to search for traces of new physics in neutron beta decay with novel experimental techniques. Precision measurements in neutron decay allow searching for physics beyond the Standard Model. An accuracy of $10^{-4}$ in the observables corresponds to energy scales of 1 – 100 TeV for new particles and interactions; far above the production threshold at the LHC. To achieve this accuracy, a new technique is developed: R×B spectroscopy. An R×B spectrometer measures the momentum of charged particles by their drift in a circular magnetic field. This precision method will be applied to determine several correlations between decay products in neutron decay. For measurements at ultimate statistics, the R×B spectrometer will be combined with PERC, a new facility at the FRM II in Garching/Germany that collects electrons and protons from a large neutron decay volume. A final goal is to measure or set limits on the Fierz interference term. This term is forbidden in the Standard Model and has not yet been measured with neutrons. A non-zero value would indicate that yet unknown charged Higgs bosons, sleptons, or leptoquarks were exchanged instead of the Standard Model W boson. Besides the physics motivation, the measurement concept and physics programme of NoMoS are presented.