1. David Hitlin Frascati SuperB Workshop March 16/17, 2006 An EMC for Super B  With the likely time structure of SuperB, backgrounds and radiation damage to the EMC should be reduced from those at a 10 36 conventional collider  In the endcap region, at least, there will be multi-Bhabhas within the decay/integration time of the CsI(Tl) A faster scintillator with a smaller Molière radius may be needed  We have an excellent candidate in LSO or LYSO, which is under active study by Ren-Yuan Zhu at Caltech  We are also developing a liquid Xe scintillation counter, although this is more difficult to integrate into an existing detector and is probably irrelevant to SuperB

2. David Hitlin Frascati SuperB Workshop March 16/17, 2006 Scintillating Crystals for HEP CrystalNaI(Tl)CsI(Tl)CsIBaF 2 BGOPbWO 4 LSO(Ce)GSO(Ce) Density (g/cm 3 )3.674.51 4.897.138.37.406.71 Melting Point (ºC)651621 12801050112320501950 Radiation Length (cm) 2.591.85 2.061.120.91.141.37 Molière Radius (cm)4.83.5 3.42.32.02.32.37 Interaction Length (cm) 41.437.0 29.921.8182122 Refractive Index a 1.851.791.951.502.152.21.821.85 HygroscopicityYesSlight No Luminescence b (nm) (at peak) 410560420 310 300 220 480560 420 440 Decay Time b (ns)230130035 6 630 0.9 30050 10 4260 Light Yield b,c (%)100455.6 2.3 21 2.7 130.1 0.6 7530 d(LY)/dT b (%/ ºC)~00.3-0.6-2 ~0 -1.6-1.9-0.3-0.1 ExperimentCrystal Ball CLEO BABAR Belle BES III KTeV, E787 TAPS (L*) (GEM) L3 BELLE PANDA? CMS ALICE PANDA? (BTeV) Super B ? - a. at peak of emission; b. up/low row: slow/fast component; c. measured with bi-alkali PMT

3. David Hitlin Frascati SuperB Workshop March 16/17, 2006 Comparison of CsI(Tl) and LSO spectra and readout