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K  fake rates from D ⁰ →K -  + Vs D ⁰ →K ±  ∓ Sadia Khalil & Sheldon Stone EHEP Group Meeting Oct 2007.

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Presentation on theme: "K  fake rates from D ⁰ →K -  + Vs D ⁰ →K ±  ∓ Sadia Khalil & Sheldon Stone EHEP Group Meeting Oct 2007."— Presentation transcript:

1 K  fake rates from D ⁰ →K -  + Vs D ⁰ →K ±  ∓ Sadia Khalil & Sheldon Stone EHEP Group Meeting Oct 2007

2 Objective Study the RICH efficiency and fake rates for kaons and pions. Method D 0 D 0 → K -  +, K   ± (CC is implied) Selection Criteria TagSide Signal Side <  E 1 < <  E 2 <

3 No PID

4 Kaon with RICH

5 Pion with RICH

6 Double ID

7 To ascertain the backgrounds we checked m bc (Kpi) Vs m bc (Kpi) plot The signal side is described with the RICH applied.

8 No PIDSingle K Single  Double ID K -  +, K   ± RSWSRSWSRSWSRSWS Result(600pb -1 ) The 2 events in WS-Double ID can be only from mixing as doubly Cabbibo decays are forbidden due to Bose-Einsitien statistics or they can be background. We subtract these 2 (actually RS) events from the other WS candidates. Efficiencies and Fake Rates ε K = 90.6 %, ε  = 97.4 % f K→  = (2.41± 0.52) % f  →K = (1.08± 0.34) %


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