Limits on the Non-Standard Interactions of Neutrinos from e+e− Colliders

We provide an effective Lagrangian analysis of contact non-standard interactions of neutrinos with electrons, which can be effectively mediated by extra particles, and examine the associated experimental limits. At present, such interactions are strongly constrained only for νμ: the bounds are loose for νe and absent for ντ . We emphasize the unique role played by the reaction ee → νν̄γ in providing direct constraints on such non-standard interactions. E-mail address: [email protected] E-mail address: [email protected]