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What is $\Delta m^2_{ee}$ ?

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arxiv 1601.07464 v1 pith:OKTL5IY7 submitted 2016-01-27 hep-ph hep-ex

classification hep-phhep-ex
keywords deltabaselineexperimentsdefinitionseffectiverenoshorttheta
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abstract

The current short baseline reactor experiments, Daya Bay and RENO (Double Chooz) have measured (or are capable of measuring) an effective $\Delta m^2$ associated with the atmospheric oscillation scale of 0.5 km/MeV in electron anti-neutrino disappearance. In this paper, I compare and contrast the different definitions of such an effective $\Delta m^2$ and argue that the simple, L/E independent, definition given by $\Delta m^2_{ee} \equiv \cos^2 \theta_{12} \Delta m^2_{31}+ \sin^2 \theta_{12} \Delta m^2_{32}$, i.e. "the $\nu_e$ weighted average of $\Delta m^2_{31}$ and $\Delta m^2_{32}$," is superior to all other definitions and is useful for both short baseline experiments mentioned above and for the future medium baseline experiments JUNO and RENO 50.

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