From STICHEL@D0SB15.FNAL.GOV Thu Aug  6 09:20:09 1998
Date: Thu, 6 Aug 1998 11:31:55 -0500 (CDT)
From: Frederic Stichelbaut <STICHEL@D0SB15.FNAL.GOV>
To: wahl@sg1.hep.fsu.edu
Cc: STICHEL@D0SB15.FNAL.GOV
Subject: Re: PAC proposal


Hello Horst,

I read the physics section in the PAC proposal and here are a few
comments:

page 1: - efficiency vs background --> $vs.$
        - (see also subsection 1.4. --> ")" missing
page 2: - In table 1:
          * I also used a sample of 500 ttbar -> all jets with 3 additional
            interactions
          * the B_d -> J/psi Ks was also produced with ISAJET and contained
            9760 events.
          * the last two entries in that table should be B_s -> D_s + ...
page 5: - when describing the Fig.4, I would say that the Gaussian width
          is very close to 1 for bb events, but degraded for tt because
          of the high track multiplicity.
        - When discussing the imp. param. significance distribution for
          primary and secondary tracks, I am not sure Fig.6 is useful,
          as the information is already contained in Fig.5 (the tracks
          not coming from the primary vertex are from b decays).

page 6: end of section 1.3, some math. symbols are not well separate from
        the text, like "$t\bar{t}$and single top studies"

page 14: - second line of section 1.8: intensely --> intensively
         - rare decay modes:
           the inclusive mode should be " B -> mu mu X_s"
           the exclusive mode should be "B_d -> mu+mu- or B_s -> mu+mu-"
page 15: - "concentrateon" -> concentrate on
         - when describing samples 2 and 3 used for B_s studies, I would
           mention that the B meson on the other side was forced to decay
           into mu+X, giving at least one muon to trigger on.
         - to facilitate the reading of table 12, I would introduce an
           additional line at the beginning of each group, specifying
           "dimuon", "single muon" and "dimuon + single muon" trigger
           combinations.
         - Also, I would start each trigger combination by a $\bullet$
           for easier reading.
         - Then, I would introduce some new combination and remove others:
           * dimuon section: remove (XM1,XM2) but add (CT1,CT1) with the
             numbers 272 Hz, 20.1%, 8.2% and 0.5%
             You could also add (CT1,CT1) + E_T^jet > 10 GeV with the
             numbers 102 Hz, 0.9%, 0.5% and 0.0% (not in the note but
             computed later).
           * single muon: you could add XM3 with numbers
             13.5 Hz, 10.8%, 4.4% and 1.4%

           ==> This reinforce the feeling that the STT seems to be the best
               way to reduce the rates for B physics.

page 17: ref. 2 : title in between " + capitals.

Regards,
                   Frederic.