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in 900 GeV collision data

in 900 GeV collision data. Ehud Duchovni Ofir Gabizon. Selection of candidates. Each candidate is required to satisfy:. The invariant mass of the two tracks, treated as massless is required to satisfy:. (to remove conversions).

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in 900 GeV collision data

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  1. in 900 GeV collision data Ehud Duchovni Ofir Gabizon

  2. Selection of candidates Each candidate is required to satisfy: The invariant mass of the two tracks, treated as massless is required to satisfy: (to remove conversions) For all plots except mass reconstruction, The invariant mass of the two tracks, treated as pions is required to satisfy

  3. Reconstruction of mass • The mass distribution of candidates fitted to a single Gaussian:

  4. The mass distribution of candidates fitted to a double Gaussian:

  5. decay distance and distributions

  6. Reconstruction efficiencies from MC simulation

  7. Attempt to measure efficiencies from data • It was thought that the reconstruction efficiency might be obtainable from the measured decay distance and distributions without MC input by using the known lifetime distribution. • This set of equations describes the relationship between the distributions after binning: • Without further assumptions there is variables and equations. One must make further assumptions to be able to solve these equations • However, since the reconstruction efficiency is a strong function of the parameters this is problematic

  8. Prospects • Seeking new approaches for measuring the reconstruction efficiency from data

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