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Selecting mu -> e Conversion Targets to distinguish Lepton Flavour-Changing Operators
Sacha Davidson, Yoshitaka Kuno, Masato Yamanaka
The experimental sensitivity to conversion on nuclei is set to improve by four orders of magnitude in coming years. However, various operator coefficients add coherently i…
Axion absorption and the spin temperature of primordial hydrogen
Adrien Auriol, Sacha Davidson, Georg Raffelt
An absorption dip in the spectrum of the cosmic microwave background observed by the EDGES experiment suggests an unexplained reduction of the hydrogen spin temperature at cosmic r…
Majorana Neutrino Masses in the RGEs for Lepton Flavour Violation
Sacha Davidson, Martin Gorbahn, Matthew Leak
We suppose that the observed neutrino masses can be parametrised by a lepton number violating dimension-five operator, and calculate the mixing of double insertions of this operato…
Constraints on 2l2q operators from flavour-changing meson decays
Sacha Davidson, Albert Saporta
We study lepton flavour violating two- and three-body decays of pseudoscalar mesons in Effective Field Theory (EFT). We give analytic formulae for the decay rates in the presence o…