The P326 experiment at the CERN SPS has been proposed with the purpose of measuring the branching ratio for the decay K+ → π+vv̄ to within ∼10%. The photon veto system must provide a rejection factor of 108 for π0 decays. We have explored two designs for the large-angle veto detectors, one based on scintillating tiles and the other using scintillating fibers. We have constructed a prototype module based on the fiber solution and evaluated its performance using low-energy electron beams from the Frascati Beam-Test Facility. For comparison, we have also tested a tile prototype constructed for the CKM experiment, as well as lead-glass modules from the OPAL electromagnetic barrel calorimeter. We present results on the linearity, energy resolution, and time resolution obtained with the fiber prototype, and compare the detection efficiency for electrons obtained with all three instruments. © 2007 IEEE.
A prototype large-angle photon veto detector for the P326 experiment at CERN / Ambrosino, F.; Antonelli, A.; Capitolo, E.; Cooper, P. S.; Fantechi, R.; Iannotti, L.; Lamanna, G.; Leonardi, E.; Moulson, M.; Napolitano, M.; Palladino, V.; Raggi, M.; Romano, A.; Saracino, G.; Serra, M.; Spadaro, T.; Valente, P.; Venditti, S.. - 1:(2007), pp. 57-64. (Intervento presentato al convegno 2007 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS-MIC tenutosi a Honolulu; United States nel 2007) [10.1109/NSSMIC.2007.4436288].
A prototype large-angle photon veto detector for the P326 experiment at CERN
Raggi, M.;
2007
Abstract
The P326 experiment at the CERN SPS has been proposed with the purpose of measuring the branching ratio for the decay K+ → π+vv̄ to within ∼10%. The photon veto system must provide a rejection factor of 108 for π0 decays. We have explored two designs for the large-angle veto detectors, one based on scintillating tiles and the other using scintillating fibers. We have constructed a prototype module based on the fiber solution and evaluated its performance using low-energy electron beams from the Frascati Beam-Test Facility. For comparison, we have also tested a tile prototype constructed for the CKM experiment, as well as lead-glass modules from the OPAL electromagnetic barrel calorimeter. We present results on the linearity, energy resolution, and time resolution obtained with the fiber prototype, and compare the detection efficiency for electrons obtained with all three instruments. © 2007 IEEE.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
