Observing CP-violating Higgs Signals with Heavy Majorana Neutrinos

Details Observing CP-violating Higgs Signals with Heavy Majorana Neutrinos Observing CP-violating Higgs Signals with Heavy Majorana Neutrinos

2011-05-09

arxiv.org/abs/1105.1780v2

Phys.Rev.D84:015001,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, 7 figures

Scientific paper

10.1103/PhysRevD.84.015001

We demonstrate the ability to measure the CP-phase of a Higgs boson state by looking at the decays of heavy, Majorana neutrinos in the process $pp \to H \to N N$ at the LHC. This is shown for signals with both opposite-sign ($l^{\pm} l^{\mp} W^{\pm} W^{\mp}$) and same-sign ($l^{\pm} l^{\pm} W^{\mp} W^{\mp}$) leptonic final states. These signals are investigated in the general framework of a sequential fourth generation of fermions with an additional right-handed neutrino. Such a scenario would naturally give rise to heavy Majorana neutrinos as well as significant enhancements to Higgs production via gluon fusion due to the contributions of the new, heavy quark states running in the fermion loops. Combined with the low background inherent to a same-sign lepton signal, this could be a useful way to investigate the CP-nature of a Higgs boson state at the LHC.

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