91 citations · 343 across the 10 of their papers we have counts for
11 papers · 1 filter
Crawling technicolor
O. Catà, R. J. Crewther, Lewis C. Tunstall
We analyze the Callan-Symanzik equations when scale invariance at a nontrivial infrared (IR) fixed point is realized in the Nambu-Goldstone (NG) mode. As a res…
Probing lepton flavour (universality) violation at NA62 and future kaon experiments
Lewis C. Tunstall, Andreas Crivellin, Giancarlo D'Ambrosio +1
Recent results from the LHC's first run have revealed intriguing departures from lepton flavour universality in the semi-leptonic decays of -mesons. We discuss the complementary…
Dispersive treatment of and
Gilberto Colangelo, Ramon Stucki, Lewis C. Tunstall
We analyse the rare kaon decays and $(\ell = e \mbox{ or } μ)$ in a dispersive framework in which the weak Hamiltonian carries momentum. Our an…
Stop searches in flavourful supersymmetry
Andreas Crivellin, Ulrich Haisch, Lewis C. Tunstall
Natural realisations of supersymmetry require light stops , making them a prime target of LHC searches for physics beyond the Standard Model. Depending on the kinemat…
Lepton flavor (universality) violation in rare kaon decays
Andreas Crivellin, Giancarlo D'Ambrosio, Martin Hoferichter +1
Recent anomalies in the decays of mesons and the Higgs boson provide hints towards lepton flavor (universality) violating physics beyond the Standard Model. We observe that fou…
Status of Chiral-Scale Perturbation Theory
R. J. Crewther, Lewis C. Tunstall
Chiral-scale perturbation theory PT has been proposed as an alternative to chiral perturbation theory which explains the rule for kaon dec…
Dark Matter: Connecting LHC searches to direct detection
Andreas Crivellin, Martin Hoferichter, Massimiliano Procura +1
In these proceedings we review the interplay between LHC searches for dark matter and direct detection experiments. For this purpose we consider two prime examples: the effective f…
Light stops, blind spots, and isospin violation in the MSSM
Andreas Crivellin, Martin Hoferichter, Massimiliano Procura +1
In the framework of the MSSM, we examine several simplified models where only a few superpartners are light. This allows us to study WIMP--nucleus scattering in terms of a handful…
rule for kaon decays derived from QCD infrared fixed point
R. J. Crewther, Lewis C. Tunstall
This article gives details of our proposal to replace ordinary chiral perturbation theory PT by 3-flavor chiral-scale perturbation theory PT.…
Infrared Fixed Point in the Strong Running Coupling: Unraveling the ΔI=1/2 puzzle in K-Decays
R. J. Crewther, Lewis C. Tunstall
In this talk, we present an explanation for the Delta I = 1/2 rule in K-decays based on the premise of an infrared fixed point alpha_IR in the running coupling alpha_s of quantum c…
Origin of ΔI=1/2 Rule for Kaon Decays: QCD Infrared Fixed Point
R. J. Crewther, Lewis C. Tunstall
We replace ordinary chiral SU(3)_L * SU(3)_R perturbation theory CHPT_3 by a new theory CHPT_sigma based on a low-energy expansion about an infrared fixed point alpha_IR for 3-flav…