Roberto Vega

Constraints on CP violation in the Higgs sector from the ρ parameter

We discuss the relation between CP symmetry and the custodial SU(2) symmetry in the Higgs sector. In particular, we show that CP violation in the Higgs-gauge sector is allowed only if the custodial SU(2) symmetry is broken. We exploit these facts to constrain CP violation using the experimental bounds on ρ−1. CP nonconservation in the Higgs-fermion interactions can also be constrained in a similar way although a possible exception is pointed out.

Detection of neutral MSSM Higgs bosons in four b final states at the Tevatron and the LHC: An update

We update our earlier results regarding detection of gg → bbh → 4b (h = h0, H0, A0) to incorporate the very high b-tagging efficiencies and purities that are now anticipated at the LHC. New results for the Tev∗ are given, and indicate substantial potential for these modes. The complementarity of the H0 → h0h0 → 4b final state mode is illustrated for the LHC. The latest radiative corrections to the Higgs sector are incorporated.

The Drell–Hearn sum rule at order α3

Abstract The Drell–Hearn–Gerasimov–Iddings (DHGI) sum rule for electrons is evaluated at order α 3 and shown to agree with the Schwinger contribution to the anomalous magnetic moment.

LHC detection of neutral MSSM Higgs bosons via gg → bbh → bbbb

We demonstrate that simultaneous detection of two of the neutral Higgs bosons of the Minimal Supersymmetric Model will be possible at the LHC in the

Standard model decays of tau into three charged leptons

b\anti b b\anti b

Detection of the minimal supersymmetric model Higgs boson H0 in its h0h0 → 4b and A0A0 → 4b decay channels

final state, provided

Measuring the neutrino mass using intense photon and neutrino beams

\tanb

The supersymmetric Georgi-Machacek model

is large and

Light (and darkness) from a light hidden Higgs

b

Covariant method for calculating helicity amplitudes

-tagging can be performed with good efficiency and purity. This mode enhances the already established guarantee that there is no region of supersymmetric parameter space for which {\it none} of the Higgs bosons of the model can be seen at the LHC.Abstract We demonstrate that simultaneous detection of two of the neutral Higgs bosons of the Minimal Supersymmetric Model will be possible at the LHC in the b b b b final state, provided tan β is large and b -tagging can be performed with good efficiency and purity. This mode enhances the already established guarantee that there is no region of supersymmetric parameter space for which none of the Higgs bosons of the model can be seen at the LHC.