# The $\theta _{13}$ and $\delta _{CP}$ sensitivities of the SPL-Fréjus project revisited

Abstract : An optimization of the CERN SPL beam line has been performed guided by the sensitivities to the \theta_{13} mixing angle and to the \delta_{CP} Dirac CP violating phase. A UNO-like 440 ktons water Cerenkov detector located at 130 km from the target in a new foreseen Frejus laboratory has been used as a generic detector. Concerning the \delta_{CP} independent \theta_{13} sensitivity, a gain of about 20% may be reached using a 3.5 GeV proton beam with a 40 m long, 2 m radius decay tunnel compared to the up to now considered 2.2 GeV beam energy and 20 m long, 1 m radius decay tunnel. This may motivate new machine developments to upgrade the nominal SPL proton beam energy.
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Journal articles
European Physical Journal C, 2006, 45, pp.643-657. <10.1140/epjc/s2005-02455-x>

http://hal.in2p3.fr/in2p3-00023374
Contributor : Françoise Marechal <>
Submitted on : Wednesday, December 1, 2004 - 3:59:25 PM
Last modification on : Thursday, March 30, 2006 - 12:32:19 PM

### Citation

Jean-Eric Campagne, Antoine Cazes. The $\theta _{13}$ and $\delta _{CP}$ sensitivities of the SPL-Fréjus project revisited. European Physical Journal C, 2006, 45, pp.643-657. <10.1140/epjc/s2005-02455-x>. <in2p3-00023374>

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