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SMT H-disks

SMT H-disks. SMT F-disks. SMT barrels. Pseudorapidity: h =-ln[tan (q /2)]. We trigger on m ’s from semi-leptonic B decays. By conservation of flavor, every event that has one b(b) quark must have at least one b(b).

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SMT H-disks

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  1. SMT H-disks SMT F-disks SMT barrels Pseudorapidity: h=-ln[tan(q/2)] • We trigger on m’s from semi-leptonic B decays. • By conservation of flavor, every event that has one b(b) quark must have at least one b(b). • Can trigger on hadronic B decays by using m from B decaying on the other side of the event. q (o) 90 45 40.4 15.4 15 10 5.7 2.1 h 0 0.88 1 2 2.03 2.44 3 4 m+ ν ν } } μ μ - - K K Bs f f B B Bs + + K K d d π- + + μ μ - Ds B Physics in the DØ Detector B Physics Program Depends Strongly On: Muon System Tracking System • Mean decay length of all produced B mesons ~ few mm. • Almost all B mesons decay into at least one charmed hadron, e.g. D0, D*, Ds, which also have long decay length. • So, a typical bb event has 5 vertices • 1 primary, 2 secondary from B decays, 2 tertiary from charmed decays • Resolution of tracking system is crucial to reconstructing these vertices. How Do B Physics Events Look In The DØ Detector? Same event in detector Diagram of oscillated Bs event

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