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We make the simple observation that there exists a universal unitarity triangle for all models, like the SM, the Two Higgs Doublet Models I and II and the MSSM with minimal flavour violation, that do not have any new operators beyond those present in the SM and in which all flavour changing transitions are governed by the CKM matrix with no new phases… (More)

- Benjamin C. Allanach, C. Balázs, +17 authors J. Lykken
- Computer Physics Communications
- 2009

The Supersymmetry Les Houches Accord (SLHA) [1] provides a universal set of conventions for conveying spectral and decay information for supersymmetry analysis problems in high energy physics. Here, we propose extensions of the conventions of the first SLHA to include various gener-alisations: the minimal supersymmetric standard model with violation of CP,… (More)

- Paolo Gambino
- 2001

The charm-loop contribution to ¯ B → X s γ is found to be numerically dominant and very stable under logarithmic QCD corrections. The strong enhancement of the branching ratio by QCD logarithms is mainly due to the b-quark mass evolution in the top-quark sector. These observations allow us to achieve better control over residual scale-dependence at the… (More)

- M Ciuchini, G Degrassi, P Gambino, G F Giudice
- 1997

We present the QCD corrections to the matching conditions of the ∆B = 1 magnetic and chromo-magnetic operators in the Standard Model and in two-Higgs doublet models. We use an off-shell matching procedure which allows us to perform the computation using Taylor series in the external momenta, instead of asymptotic expansions. In the Standard Model case, we… (More)

- V. Aquila, P. Gambino, G. Ridolfi
- 2005

We compute O(α s) and O(α n s β n−1 0) (BLM) corrections to the five structure functions relevant for b → qℓ¯ ν decays and apply the results to the moments of a few distributions of phenomenological importance. We present compact analytic one-loop formulae for the structure functions, with proper subtraction of the soft divergence.

- M. Antonelli, D. M. Asner, +67 authors J. Zupan
- 2007

The latest Belle and BaBar measurements of the inclusive ¯ B → X s l + l − branching ratio have smaller errors and lower central values than the previous ones. We point out that these results indicate that the sign of the b → sγ amplitude is the same as in the SM. This underscores the importance of ¯ B → X s l + l − in searches for new physics, and may be… (More)

- G Degrassi, P Gambino, G F Giudice
- 2000

We discuss possible large contributions to B → X s γ, which can occur at the next-to-leading order in supersymmetric models. They can originate from terms enhanced by tan β factors, when the ratio between the two Higgs vacuum expectation values is large, or by logarithm of M susy /M W , when the supersymmetric particles are considerably heavier than the W… (More)

- Supersymmetry M Ciuchini, G Degrassi, P Gambino, G F Giudice
- 1998

We compute the QCD next-to-leading order matching conditions of the (chromo)-magnetic operators relevant for B → X s γ in supersymmetric models with minimal flavour violation. The calculation is performed under the assumption that the charginos and one stop are lighter than all other squarks and the gluino. In the parameter region where a light charged… (More)

- S. Davidson, S. Forte, P. Gambino, N. Rius, A. Strumia
- 2001

We discuss whether the NuTeV anomaly can be explained, compatibly with all other data, by QCD effects (maybe, if the strange sea is asymmetric, or there is a tiny violation of isospin), new physics in propagators or couplings of the vector bosons (not really), loops of supersymmetric particles (no), dimension six operators (yes, for one specific SU(2)… (More)