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Constraints on scalar leptoquarks from lepton and kaon physics

Journal of High Energy Physics. 2019;2019(12):1-40 DOI 10.1007/JHEP12(2019)089

 

Journal Homepage

Journal Title: Journal of High Energy Physics

ISSN: 1029-8479 (Online)

Publisher: SpringerOpen

Society/Institution: International School for Advanced Studies (SISSA)

LCC Subject Category: Science: Physics: Nuclear and particle physics. Atomic energy. Radioactivity

Country of publisher: Germany

Language of fulltext: English

Full-text formats available: PDF

 

AUTHORS


Rusa Mandal (IFIC, Universitat de València-CSIC)

Antonio Pich (IFIC, Universitat de València-CSIC)

EDITORIAL INFORMATION

Blind peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 12 weeks

 

Abstract | Full Text

Abstract We present a comprehensive analysis of low-energy signals of hypothetical scalar leptoquark interactions in lepton and kaon transitions. We derive the most general effective four-fermion Lagrangian induced by tree-level scalar leptoquark exchange and identify the Wilson coefficients predicted by the five possible types of scalar leptoquarks. The current constraints on the leptoquark Yukawa couplings arising from lepton and kaon processes are worked out, including also loop-induced transitions with only leptons (or quarks) as external states. In the presence of scalar leptoquark interactions, we also derive the differential distributions for flavour-changing neutral-current transitions in semileptonic kaon modes, including all known effects within the Standard Model. Their interference with the new physics contributions could play a significant role in future improvements of those constraints that are currently hampered by poorly-determined non-perturbative parameters.