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- Sheldon L Glashow, Diego Guadagnoli, Kenneth Lane
- Physical review letters
- 2015

The LHCb Collaboration's measurement of R_{K}=B(B^{+}→K^{+}μ^{+}μ^{-})/B(B^{+}→K^{+}e^{+}e^{-}) lies 2.6σ below the Standard Model prediction. Several groups suggest this deficit to result from new lepton nonuniversal interactions of muons. But nonuniversal leptonic interactions imply lepton flavor violation in B decays at rates much larger than are… (More)

- D Guadagnoli, F Mescia, S Simula
- 2005

We apply twisted boundary conditions to lattice QCD simulations of three-point correlation functions in order to access spatial components of hadronic momenta different from the integer multiples of 2π/L. We calculate the vector and scalar form factors relevant to the K → π semileptonic decay and consider all the possible ways of twisting one of the quark… (More)

We present a strategy for a lattice evaluation of the neutron electric dipole moment induced by the strong CP violating term of the QCD Lagrangian. Our strategy is based on the standard definition of the electric dipole moment, involving the charge density operator J0, in case of three flavors with non-degenerate masses. We present a complete diagrammatic… (More)

- D Guadagnoli, V Lubicz, M Papinutto, S Simula
- 2006

We present the first quenched lattice QCD study of the form factors relevant for the hyperon semileptonic decay Σ− → n l ν. The momentum dependence of both axial and vector form factors is investigated and the values of all the form factors at zero-momentum transfer are presented. Following the same strategy already applied to the decay K → π−l ν, the… (More)

- D. Guadagnoli
- 2003

Flavor singlet and non-singlet axial Ward identities are investigated using the Wilson formulation of lattice QCD with Clover O(a)-improvement, which breaks explicitly chiral symmetry. The matching at one-loop order of all the relevant renormalization constants with the continuum MS scheme is presented. Our calculations include: 1) the contributions arising… (More)

- Diego Guadagnoli
- 2009

I provide a short overview of the hypothesis of Yukawa unification within SUSY GUTs, emphasizing its motivations and its predictivity-enhancing role. I then discuss the status of the tests of this hypothesis, and the major role played by observables in the flavor sector. Concerning the patterns of soft SUSY-breaking terms assumed at the GUT scale, I focus… (More)

- D Guadagnoli
- 2008

We provide a short account of the effects one expects on meson-antimeson oscillations in the context of the Minimal Supersymmetric Standard Model (MSSM). This issue is largely dependent on the assumptions made on the MSSM parameter space. In this respect, we consider in closer detail the cases of the general MSSM, with completely free soft terms, and the… (More)

- Diego Guadagnoli
- 2008

The hypothesis of “grand unification” – namely, that the strengths of the three Standard Model (SM) gauge couplings unify at some energy scale – is not only appealing in itself, but allows also to address structural questions that in the SM remain unanswered, like the gauge quantum number assignments. This hypothesis is also supported by the measured… (More)

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