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THIRD PRODUCTION

THIRD PRODUCTION. Preliminary Analyses Jaiby Joseph 11/19/2010. This analysis has wrong D0dcaPV Calculation and the cut on Cos(theta *) is not symmetric. Pico Cut Set 1:. |Cos(θ*)| < 0.6 Probability > 0.1 |RapidityD0| < 0.5 Slength > 0 |ndEdx|K,π < 2. Plots are at:.

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THIRD PRODUCTION

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  1. THIRD PRODUCTION Preliminary Analyses Jaiby Joseph 11/19/2010 This analysis has wrong D0dcaPV Calculation and the cut on Cos(theta*) is not symmetric

  2. Pico Cut Set 1: |Cos(θ*)| < 0.6 Probability > 0.1 |RapidityD0| < 0.5 Slength > 0 |ndEdx|K,π < 2 Plots are at: http://www.star.bnl.gov/~jai2006/jjoseph/29thSep2010_3rdProduction.htm A weak signal appeared when requiring the momentum of tracks to be > 0.7GeV/c combined with other cuts

  3. Pico Cut Set 2 (Number of Evts ~ 6.5M) Cuts Used to make pico file: Offline Cuts on the plot below: 50μm < |decayLength| < 400μm |D0dcaPV| < 200μm Dca betw. Tracks < 200μm |Cos(θ*)| < 0.6 |RapidityD0| < 0.5 |ndEdx|K,π < 2 SiHits > 2 dcaXY < 0.1 Probability > 0.1 |EtaD0| < 1.85 S/N ~ 5.56 More cut sets and plots are at: http://www.star.bnl.gov/~jai2006/jjoseph/17thNov2010-SecondLook_3rdProd.htm

  4. Pico Cut Set 2 (Number of Evts ~ 6.5M) (D0+D0bar) Offline Cuts on the plot below: 50μm < |decayLength| < 400μm |D0dcaPV| < 200μm Dca betw. Tracks < 200μm chargeK*ChargePi < 0 S/N ~ 4.32

  5. Pico Cut Set 2 (Number of Evts ~ 6.5M) D0 Offline Cuts on the plot below: 50μm < |decayLength| < 400μm |D0dcaPV| < 200μm Dca betw. Tracks < 200μm chargeK < 0 && ChargePi > 0 S/N ~ 2.70

  6. Pico Cut Set 2 (Number of Evts ~ 6.5M) D0bar Offline Cuts on the plot below: 50μm < |decayLength| < 400μm |D0dcaPV| < 200μm Dca betw. Tracks < 200μm chargeK > 0 && ChargePi < 0 S/N ~ 3.39

  7. Summary • With new dataset a strong signal is observed without adding a cut on the track momenta. • Increased the requirement on SiHits > 2 and probability > 0.1 • In the next step I will try to relax the cut on probability to see the effect • To do : Try same sign background subtraction with the available statistics

  8. Update 01/01/2011

  9. It was realized later that the cut applied on Cos(θ*) was not symmetric. Therefore I added an offline cut on Cos(θ*) > -0.6 on the plots in previous slides Slide 3 with a symmetric cut on Cos(θ*)

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