63 citations · 276 across the 15 of their papers we have counts for
15 papers · 1 filter
Feasible Deviations from Unitarity with Vector-Like Quark Singlets
Francisco Albergaria, Francisco J. Botella, G. C. Branco +2
We deduce pertinent relations between the elements of the CKM matrix, and find that not all of these are totally compatible with experiment and/or the assumption of the SM $3 \time…
Spontaneous CP violation and symmetry in two-Higgs-doublet models with flavour conservation
João M. Alves, Francisco J. Botella, Carlos Miró +1
In multi-Higgs-doublet models, requiring simultaneously that (i) CP violation only arises spontaneously, (ii) tree level scalar flavour changing couplings are absent and (iii) the…
What if the Masses of the First Two Quark Families are not Generated by the Standard Higgs?
F. J. Botella, G. C. Branco, M. N. Rebelo +1
We point out that, in the context of the SM, is expected to be large, of order one. The fact that mo…
Natural Quasi-Alignment with two Higgs Doublets and RGE Stability
F. J. Botella, G. C. Branco, António M. Coutinho +2
In the context of two Higgs doublet models, we study the conditions required in order to have stable quasi-alignment in flavour space. We show that stability under the RGE imposes…
Mixing asymmetries in B meson systems, the D0 like-sign dimuon asymmetry and generic New Physics
F. J. Botella, G. C. Branco, M. Nebot +1
The measurement of a large like-sign dimuon asymmetry by the D0 experiment at the Tevatron departs noticeably from Standard Model expectations and it may be interpreted…
Invariants and Flavour in the General Two Higgs Doublet Model (Moriond QCD2013)
M. N. Rebelo
We construct weak basis invariants which can give insight into the physical implications of any flavour model, written in an arbitrary weak basis (WB) in the context of 2HDM.
Invariants and Flavour in the General Two-Higgs Doublet Model
F. J. Botella, G. C. Branco, M. N. Rebelo
The flavour structure of the general Two Higgs Doublet Model (2HDM) is analysed and a detailed study of the parameter space is presented, showing that flavour mixing in the 2HDM ca…
Can one detect new physics in I=0 and/or I=2 contributions to the decays B --> pi pi?
Seungwon Baek, F. J. Botella, David London +1
We study the effects of new-physics contributions to B --> pi pi decays, which can be parametrized as four new complex quantities. A simple analysis is provided by utilizing the re…
New Physics and Evidence for a Complex CKM
F. J. Botella, G. C. Branco, M. Nebot +1
We carefully analyse the present experimental evidence for a complex CKM matrix, even allowing for New Physics contributions to , , , , a…
The size of chi = arg (-Vts Vtb* Vcs* Vcb) and physics beyond the Standard Model
J. A. Aguilar-Saavedra, F. J. Botella, G. C. Branco +1
We analyse the allowed range of values of chi, both in the Standard Model and in models with New Physics, pointing out that a relatively large value of chi, e.g. of order lambda, i…
Unitarity Triangles and the Search for New Physics
F. J. Botella, G. C. Branco, M. Nebot +1
Assuming that the Kobayashi-Maskawa mechanism gives the dominant contribution to CP violation at low energies, we propose a novel way of testing the flavour sector of the Standard…
How sensitive to FCNC can CP asymmetries be?
G. Barenboim, F. J. Botella, G. C. Branco +1
We show that the study of CP asymmetries in neutral B-meson decays provides a very sensitive probe of flavour-changing neutral currents (FCNC). We introduce two new angles, $α_{SM}…
Effective Lagrangian in theories with vector like fermions
G. Barenboim, F. J. Botella
In this work we analyze a new piece present in the effective Lagrangian in models with extra vector-like quarks. This piece, which was not taken into account previously, i…
D^0-D^0(bar) mixing in the weak-gauged U(4)_L x U(4)_R Chiral Lagrangian Model
G. Amoros, F. J. Botella, S. Noguera +1
The D^0-D^0(bar) mixing is analyzed in a weak gauged U(4)_L x U(4)_R chiral lagrangian model where the electroweak interaction is introduced as a gauge theory over the meson degree…
Parameter free calculation of non-resonant three body decays of charmed mesons in a weak gauged U(4)_L x U(4)_R Chiral Lagrangian Model
F. J. Botella, S. Noguera, J. Portoles
Non--resonant decays of charmed mesons into three pseudoscalars are analyzed in a weak gauged chiral lagrangian model. The calculation is free of unknown pa…