SelectedSelected NewNew ResultsResults onon HeavyHeavy QuarksQuarks fromfrom XXXVI SLAC Summer Institute “Cosmic Accelerators” Tuesday, August 5, 2008 Alexandre (Sasha) Telnov Princeton University on behalf of the BABAR Collaboration SLAC, Mail Stop 35 2575 Sand Hill Road Menlo Park, CA 94025
[email protected] TheThe PEPPEP--IIII AcceleratorAccelerator ComplexComplex Reusing the SLAC linear accelerator (1966-present) and the PEP tunnel 467 ± 5 million BB pairs produced Nominal center-of-mass energy: 10.580 GeV — the ϒ(4S) bb resonance Beam energies: 9.0 GeV e−, 3.1 GeV e+ s e Number of bunches: up to 1722 il m .0 2 Peak luminosity: 12.1 x 1033 cm–1s–2 (original design: 3 x 1033 cm–1s–2) Best 24 hours: 911 pb–1 delivered (original design: 135 pb-1/day) − + 2200 m Peak beam currents: 2.05 A e , 3.03 A e circumference Luminous region (σX × σY): 125 µm × 4 µm SSI 2008: New Results on Heavy Quarks from BABAR Alexandre Telnov (Princeton), August 5, 2008 2 TheThe BBAABBARAR DetectorDetector Built by a collaboration of ~80 universities and labs from 11 countries SSI 2008: New Results on Heavy Quarks from BABAR Alexandre Telnov (Princeton), August 5, 2008 3 TheThe BBAABBARAR Detector:Detector: OutlineOutline Highlights to follow: SVT and DIRC Photon and KL detection, Electro-Magnetic Calorimeter Instrumented Flux Return electron identification 6580 crystals, Cesium Iodide doped with Thallium 12-18 layers of absorber (iron, brass) and muon detectors (RPC, LST) Detector of Internally Reflected Muon and KL identification Cherenkov Radiation Particle