Loop bounds on non-standard neutrino interactions

QC 20130513
We reconsider the bounds on non-standard neutrino interactions with matter which can be derived by constraining the four-charged-lepton operators induced at the loop level. We find that these bounds are model dependent. Naturalness arguments can lead to much stronger constraints than those presented in previous studies, while no completely model-independent bounds can be derived. We will illustrate how large loop-contributions to four-charged-lepton operators are induced within a particular model that realizes gauge invariant non-standard interactions and discuss conditions to avoid these bounds. These considerations mainly affect the O(10(-4)) constraint on the non-standard coupling strength epsilon e(mu), which is lost. The only model-independent constraints that can be derived are O(10(-1)). However, significant cancellations are required in order to saturate this bound.

Ingår i:Journal of High Energy Physics (JHEP): Springer Science and Business Media LLC:31126-67081029-8479

Av författaren/redakt...: Biggio, Carla; Blennow, Mattias ...; Fernandez Martin ...

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