Flavour violation at the LHC: type-I versus type-II seesaw in minimal supergravity

Details Flavour violation at the LHC: type-I versus type-II seesaw in minimal supergravity Flavour violation at the LHC: type-I versus type-II seesaw in minimal supergravity

2009-03-09

arxiv.org/abs/0903.1408v3

JHEP 0905:003,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 13 figures; minor changes; 4 references added, final version for publication

Scientific paper

10.1088/1126-6708/2009/05/003

We reconsider the role that the possible detection of lepton flavour violating (LFV) decays of supersymmetric particles at the Large Hadron Collider (LHC) can play in helping reconstruct the underlying neutrino mass generation mechanism within the simplest high-scale minimal supergravity (mSUGRA) seesaw schemes. We study in detail the LFV scalar tau decays at the LHC, assuming that the observed neutrino masses arise either through the pure type-I or the simpler type-II seesaw mechanism. We perform a scan over the mSUGRA parameter space in order to identify regions where lepton flavour violating decays of $\chi^0_2$ can be maximized, while respecting current low-energy constraints, such as those coming from the bounds on Br($\mu \to e \gamma$). We estimate the cross section for $\chi^0_2 \to \chi^0_1 + \tau + \mu $. Though insufficient for a full reconstruction of the seesaw, the search for LFV decays of supersymmetric states at the LHC brings complementary information to that coming from low energy neutrino oscillation experiments and LFV searches.

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