Jul 24 – 30, 2016
Highfield Campus, University of Southampton
Europe/London timezone

Progress on the lattice QCD calculation of rare kaon decays: K+ -> pi+ l+ l-

Jul 28, 2016, 5:50 PM
Building 67 Room 1003 (Highfield Campus, University of Southampton)

Building 67 Room 1003

Highfield Campus, University of Southampton

Highfield Campus, Southampton SO17 1BJ, UK
Talk Weak Decays and Matrix Elements Weak Decays and Matrix Elements


Mr Andrew Lawson (University of Southampton)


The rare decays of a kaon into a pion and a lepton/antilepton pair proceed via a flavour changing neutral current and therefore first arise in the Standard Model only as a second order electroweak interaction. This natural suppression makes these decays sensitive to the effects of potential New Physics. However the rare decay channels K+ -> pi+ l+ l- are dominated by contributions from long-distance effects, where the two electroweak processes are separated by distances over which non-perturbative QCD effects play a significant role. In this talk I will provide an update on the progress of our exploratory calculations of the long-distance contributions to K+ -> pi+ l+ l- amplitudes, which make use of the Domain Wall Fermion ensembles of the RBC and UKQCD collaborations.

Primary author

Mr Andrew Lawson (University of Southampton)


Dr Andreas Juettner (University of Southampton) Dr Antonin Portelli (The University of Edinburgh) Prof. Christopher Sachrajda (University of Southampton) Prof. Norman Christ (Columbia University) Dr Xu Feng (Peking University)

Presentation materials