Katri Huitu

Flavor physics of leptons and dipole moments

This chapter of the report of the “Flavor in the era of the LHC” Workshop discusses the theoretical, phenomenological and experimental issues related to flavor phenomena in the charged lepton sector and in flavor conserving CP-violating processes. We review the current experimental limits and the main theoretical models for the flavor structure of fundamental particles. We analyze the phenomenological consequences of the available data, setting constraints on explicit models beyond the standard model, presenting benchmarks for the discovery potential of forthcoming measurements both at the LHC and at low energy, and exploring options for possible future experiments.

Doubly charged Higgs at LHC

Abstract We have investigated the production of doubly charged Higgs particles Δ L , R ++ via the WW fusion process in proton-proton collisions at LHC energies in the framework of the left-right symmetric model. The production cross section of the right-triplet Higgs Δ R ++ is for representative values of the model parameters at femtobarn level. The discovery reach depends on the mass of the right-handed gauge boson W R . At best Δ R ++ masses up to 2.4 TeV are achievable within a one-year run. For Δ L ++ the corresponding limit is 1.75 TeV which depends on the value of the left-triplet vev ν L . Comparison with Drell-Yan pair production processes shows that studies of the WW fusion processes extend the discovery reach of LHC roughly by a factor of two. The main experimental signal of a produced Δ L , R ++ would be a hard same-sign lepton pair. There will be no substantial background due to the Standard Model (SM) interactions, since in the SM a same-sign lepton pair will always be associated with missing energy, i.e. neutrinos, due to lepton number conservation.We have investigated production of doubly charged Higgs particles

Signatures for right-handed neutrinos at the large hadron collider.

\Delta_{L,R}^{++}

Phenomenological constraints on SUSY SU(5) GUTs with nonuniversal gaugino masses

via WW fusion process in proton-proton collisions at LHC energies in the framework of the left-right symmetric model. The production cross section of the right-triplet Higgs is for representative values of model parameters at femtobarn level. The discovery reach depends on the mass of the right-handed gauge boson W_R. At best

RG-invariant sum rule in a generalization of anomaly-mediated SUSY-breaking models

\Delta_R^{++}

Probing top charged-Higgs production using top polarization at the Large Hadron Collider

mass up to 2.4 TeV are achievable within one year run. For

The higgs sector of a supersymmetric left-right model

\Delta^{++}_L

Chargino contributions to the CP asymmetry in B → φ K S decay

the corresponding limit is 1.75 TeV which depends on the value of the left-triplet vev v_L. Comparison with Drell-Yan pair production processes shows that studies of the WW fusion processes extend the discovery reach of LHC roughly by a factor of two. The main experimental signal of a produced Higgs would be a hard same-sign lepton pair. There will be no substantial background due to the Standard Model (SM) interactions, since in the SM a same-sign lepton pair will always be associated with missing energy, i.e. neutrinos, due to lepton number conservation.

New constraints on R-parity violation from μ-e conversion in nuclei

We explore possible signatures for right-handed neutrinos in a TeV scale B-L extension of the standard model at the Large Hadron Collider. The studied four lepton signal has a tiny standard model background. We find the signal experimentally accessible at the LHC for the considered parameter regions.

Constraints on doubly charged Higgs interactions at linear collider

We study phenomenological aspects of supersymmetric SU(5) grand unified theories with nonuniversal gaugino masses. For large tan�, we investigate constraints from the requirement of successful electroweak symmetry breaking, the positivity of stau mass squared and the b ! s decay rate. In the allowed region, the nature of the lightest supersymmetric particle is determined. Examples of mass spectra are given. We also calculate loop corrections to the bottom mass due to superpartners.