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Interplay of LFV and slepton mass splittings at the LHC as a probe of the SUSY seesaw

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Abstract

We study the impact of a type-I SUSY seesaw concerning lepton flavour violation (LFV) both at low-energies and at the LHC. The study of the di-lepton invariant mass distribution at the LHC allows to reconstruct some of the masses of the different sparticles involved in a decay chain. In particular, the combination with other observables renders feasible the reconstruction of the masses of the intermediate sleptons involved in $$\chi_2^0\to \tilde \ell \,\ell \to \ell \,\ell\,\chi_1^0$$ decays. Slepton mass splittings can be either interpreted as a signal of non-universality in the SUSY soft breaking-terms (signalling a deviation from constrained scenarios as the cMSSM) or as being due to the violation of lepton flavour. In the latter case, in addition to these high-energy processes, one expects further low-energy manifestations of LFV such as radiative and three-body lepton decays. Under the assumption of a type-I seesaw as the source of neutrino masses and mixings, all these LFV observables are related. Working in the framework of the cMSSM extended by three right-handed neutrino superfields, we conduct a systematic analysis addressing the simultaneous implications of the SUSY seesaw for both high- and low-energy lepton flavour violation. We discuss how the confrontation of slepton mass splittings as observed at the LHC and low-energy LFV observables may provide important information about the underlying mechanism of LFV.

Most cited references4

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Large Muon- and Electron-Number Nonconservation in Supergravity Theories

(1986)
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Lepton-Flavor Violation via Right-Handed Neutrino Yukawa Couplings in Supersymmetric Standard Model

(1995)
Various lepton-flavor violating (LFV) processes in the supersymmetric standard model with right-handed neutrino supermultiplets are investigated in detail. It is shown that large LFV rates are obtained when $$\tan \beta$$ is large. In the case where the mixing matrix in the lepton sector has a similar structure as the Kobayashi-Maskawa matrix and the third-generation Yukawa coupling is as large as that of the top quark, the branching ratios can be as large as $$Br(\mu\rightarrow e\gamma)\simeq 10^{-11}$$ and $$Br(\tau\rightarrow\mu\gamma)\simeq 10^{-7}$$, which are within the reach of future experiments. If we assume a large mixing angle solution to the atmospheric neutrino problem, rate for the process $$\tau\rightarrow\mu\gamma$$ becomes larger. We also discuss the difference between our case and the case of the minimal $$SU(5)$$ grand unified theory.
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Three-flavour neutrino oscillation update

,  ,   (2010)
We review the present status of three-flavour neutrino oscillations, taking into account the latest available neutrino oscillation data presented at the Neutrino 2008 Conference. This includes the data released this summer by the MINOS collaboration, the data of the neutral current counter phase of the SNO solar neutrino experiment, as well as the latest KamLAND and Borexino data. We give the updated determinations of the leading 'solar' and 'atmospheric' oscillation parameters. We find from global data that the mixing angle $$\theta_{13}$$ is consistent with zero within $$0.9\sigma$$ and we derive an upper bound of $$\sin^2\theta_{13} < 0.035 (0.056)$$ at 90% CL (3$$\sigma$$).
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Author and article information

Journal
27 July 2010
2011-02-16
Article
10.1007/JHEP10(2010)104
1007.4833

LPT Orsay 10-48, CFTP 10-010 and PCCF RI 1003
JHEP 1010:104,2010
50 pages, 42 eps Figures, typos corrected
hep-ph