The silver channel at the Neutrino Factory

Abstract

We notice that looking for ${\nu }_e\to {\nu }_{\tau }$ at the same time as ${\nu }_e\to {\nu }_{\mu }$ oscillations could significantly help to reduce the errors in the leptonic CP-violating phase $\delta$ measurement. We show how the ${\nu }_e\to {\nu }_{\mu }$ (``golden'') and ${\nu }_e\to {\nu }_{\tau }$ (``silver'') transitions observed at an OPERA-like 2 Kton lead-emulsion detector at L = 732 Km, in combination with the ${\nu }_e\to {\nu }_{\mu }$ transitions observed at a 40 Kton magnetized iron detector with a baseline of L = 3000 Km, strongly reduce the so-called $({\theta }_{13},\delta )$ ambiguity. We also show how a moderate increase in the OPERA-like detector mass (4 Kton instead of 2 Kton) completely eliminates the clone regions even for small values of ${\theta }_{13}$.

Latex2e, 36 pages, using epsfig

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