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We give a convenient expression for the appearance probability P(nu_mu ->nu_e) describing neutrino oscillations in matter of constant density, derivedusing textbook quantum mechanics stratagems. Our formulation retains theclarity of an expansion in alpha = Delta m_{21}^2/Delta m_{31}^2 exhibited bythe popular Cervera et al. formula [Nucl. Phys. B 579, 17 (2000)] whileenabling more accurate evaluation of oscillations over terrestrial baselines.

Transition probability of perturbative form for nu_mu -> nu_e oscillations in matter of constant density