Master formula for ε ′ / ε beyond the Standard Model

Aebischer, Jason (Excellence Cluster Universe, Technische Universität München, Boltzmannstr. 2, Garching, 85748, Germany) ; Bobeth, Christoph (Physik Department, TU München, James-Franck-Straße, Garching, 85748, Germany) (Excellence Cluster Universe, Technische Universität München, Boltzmannstr. 2, Garching, 85748, Germany) ; Buras, Andrzej J. (TUM Institute for Advanced Study, Lichtenbergstr. 2a, Garching, 85748, Germany) ; Gérard, Jean-Marc (Centre for Cosmology, Particle Physics and Phenomenology (CP3), Université catholique de Louvain, Chemin du Cyclotron 2, Louvain-la-Neuve, 1348, Belgium) ; Straub, David M.  (Excellence Cluster Universe, Technische Universität München, Boltzmannstr. 2, Garching, 85748, Germany)

11 April 2019

Abstract: We present for the first time a master formula for ε′/ε , the ratio probing direct CP violation in K→ππ decays, valid in any ultraviolet extension of the Standard Model (BSM). The formula makes use of hadronic matrix elements of BSM operators calculated recently in the Dual QCD approach and the ones of the SM operators from lattice QCD. We emphasize the large impact of several scalar and tensor BSM operators in the context of the emerging ε′/ε anomaly. We have implemented the results in the open source code flavio.


Published in: Physics letters B 792 (2019) 465-469
Published by: Elsevier
DOI: 10.1016/j.physletb.2019.04.016
License: CC-BY-3.0



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