Seminare de DPNC
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Mercredi, 9. dec. 1998

17.00 - Auditoire Stuckelberg

Universite de Geneve
Departement de physique
nucleaire et corpusculaire
24, quai Ernest-Ansermet
1211 Geneva 4

Tel. 022 702 6273
Fax 022 781 2192

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Sujet:	The CERN Neutrino Beam to Gran Sasso

Par:	Dr.  Emmanuel Tsesmelis, CERN

Resume:	
The apparent deficit of atmospheric muon neutrinos, as measured
by the Kamiokande and Super-Kamiokande experiments, provides an indication
for neutrino oscillation with a small Dm**2 (~10**(-3) to 10**(-2) eV**2)
and a large mixing angle (sin**2 (2*theta) > 0.5).

Verification and study of this effect, together with a measurement of the
oscillation parameters, should be performed under the controlled conditions
of a neutrino beam derived from an accelerator. Capitalising on the 
existing facilities and experience at CERN and at the LNGS, the CERN
neutrino beam to Gran Sasso (NGS), matched by massive detectors and low
backgrounds at the far site, is well-placed to make a significant discovery
in this field. Both nu_mu -> nu_tau appearance and nu_mu disappearance
searches are possible with the NGS. 

In this talk, the physics motivation and general lay-out of the facility
will be presented and the feasibility of its construction will be
demonstrated.