b-ID

1
b-ID

• Four taggers currently being worked on for p13
• Secondary Vertex
• Soft muons in jets
• Two Impact parameter taggers
• CSIP
• Jet Lifetime probability
• Documentation and plots available on the b-id
  webpage Follow the link
• Official Certified b-Taggers (But beware the
  process of certification has started, but not yet
  certified)
• Available Macros on TMBTrees for all four of them
• Code for TMB exists in various stages of
  development.
• some done, some done but not compiling, some
  still being written.

2
b-ID certification

• What is stalling us?
• The tracking in p13 seems to be mysterious.
• Better resolutions
• But, too many fakes
• We did not expect this, as we had tested the
  apparently p13 equivalent GTRHTF in the TARC
  samples.
• At the moment we will go back and do a comparison
  on the same muonjet and background runs p11 vs
  p13
• Hopefully this is help us understand the issues
  causing limiations
• In p13 efficiency lower by 20 or so and
  background up by a factor of 2 or more for pT
  cuts on track of 0.5 GeV. Can control this rate
  by raising pT cut (which is probably not very
  desirable for most physics.)