We had few email exchanges regarding the truth matching as it was applied
to the b->sgamma event, to see whether there is anything which can be
learnt for the semileptonic events. Here I start to forward the emails.

---------- Forwarded message ----------
Date: Tue, 30 Jan 2007 15:19:55 -0800 (PST)
From: Francesca Di Lodovico <[log in to unmask]>
To: Roberto Sacco <[log in to unmask]>,
     Antonio Petrella <[log in to unmask]>,
     Kerstin Tackmann <[log in to unmask]>
Subject: b->sgamma pseudo truth matching

Hi,
as I mentioned at today's meeting, I just want to bring up how we did the
truth-match in the b->sgamma analysis (that we call indeed pseudo
truth-matching).

The details are on BAD 768, v16, section 7.6. We distinguish between the
fully truth matched events (for which all the daughters are truth matched
to the B), and the onces which are not fully truth
matched (where the reconstructed track have an associated GHit, and the
reconstructed final state is the same than the true final state), and for
which the reconstructed hadronic mass is within 50(25) MeV away from the
true one.
The sum of all the events makes the whole of the pseudo truth matched
events.

In our case, this method worked well. Could it be feasible for the
semileptonic events? Do you see any drawback?

Cheers
		Francesca

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|  Francesca Di Lodovico              Queen Mary, University of London |
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