Some details on the D->KPi Results - MJL - 9/15/93
====================================================

  PEAK AREAS (those used for Sigma,R, and alpha):

   Tau/sigma   900A Be      900A Au      1000A Au
  ----------  ---------    ---------    ----------
   > 6.25      913+/-91    909+/-116    2444+/-132
   > 9.5       755+/-55    643+/-69     1337+/-88
   > 12.5      543+/-39    345+/-43      831+/-61
   > 15.5      327+/-28    271+/-33      558+/-41

  UNCERTAINTY SUMMARY:

   For sigma and dsigma/dxf (3 data sets combined):
                                     sigma
                                     -----
     proton flux                      10%
     lifetime value                    3%
     BR                              5.8%
     fitting & statistics           4.85%
     variation with Tau/sigma cut    3.9%
     processor eff.                    2%
     trigger eff.                   3.24%
     amon calibration/bkgd.         1.34%
     acceptance/x-beam variation       1%
     pi,K decay correction            .7%

   For the Ratio (900A only):
                                    sigma
                                    -----
     fitting & statistics             13% (this number had a typo in 9/10 draft)
     processor eff.                    4%
     amon calibration/bkgd.            4%
     acceptance/x-beam               1.4%


  AGREEMENT AMONGST DATA SETS:

               sig(ub)     dsig/dxf(ub)    Assym
              ----------   ------------   --------
    900A Be   19.6+/-3.2   64.7+/-10.6    .96+/-.18
    900A Au   20.6+/-4.5   67.5+/-14.5    .76+/-.27
   1000A Au   23.2+/-3.1   74.6+/-9.9     .98+/-.12

  NORMALIZATION FACTORS:

    Sig=ND/(L*A*Evtx*Eproc*Etrig)
    where:
      ND is the # D's
      L = (Protons/Amon) * Amonsb * Ntgt * Atten
        ,with corrections for Amon background described elsewhere,
        Ntgt the number of nucleons/cm*2, and Atten the correction
        for beam attenuation.
      A is the monte carlo acceptance including counter efficiencies
      Evtx the vertex cut efficiency (silicon efficiency included above)
         for the Tau/sig>9.5 cut
      Eproc the processor efficiency
      Etrig the trigger efficiency

      Data Set     900A Be    900A Au    1000A Au
      ---------    -------    -------    --------
      p/Amon       1.04e8     6.47e8      1.86e8
      Amon bkgd    .41e-3     .41e-3        0.
      Amonsb       8.32e5     9.05e5      3.26e5
      Ntgt        1.669e23   1.745e24    9.305e33
      Atten        .9982      .9925        .996
     Accept(A)    1.43e-3    1.5e-3      6.38e-4
      Evtx         .1865       .1792       .2374
      Eproc        .74         .70         .71
      Etrig        .42         .42         .46


    Also, although included in the Monte Carlo number, two other
    efficiencies are worth noting:
       overall hodoscope eff.   ~.96
       KPi decay survival       ~.69 (momentum dependent)

  XF AND PT RESOLUTIONS FROM MONTE CARLO (900A):
          XF   +/- .0014
          PT   +/- .056

  AMON BACKGROUND, AND UNCERTAINTY:
  
  Consider all the evidence:
  1) target scans during 900A running (dump runs lie between these),
        .37+/-.15 (Be),       .55+/-.15(Au)
  2) Be target thickness scaling (0.8 mm to 1.5 mm),
        .42 +.07/-.05
  3) target fraction measurement by silicon tracking to the downstream
     Ti window,
        .40+/-.04

  So use:
        .41+/-.04 for Be and Au at 900A
        (1000A Au has bkgd ~0; and it wouldn't influence Au tgt anyhow)
  This background uncertainty can then be used with the actual amon
  and sem3 values to see what the corresponding uncertainty in the
  number of protons is for the 900A data sets:
        +/-4%    900A Be
        +/-.3%   900A Au
  (also see my previous note for details)

  PROCESSOR EFFICIENCY:
  
  After varying the mass cut and the Tau/sig cut I have concluded that
  the uncertainty on the processor efficiency is indeed smaller than
  I had previously quoted, e.g. about .02/.74 for 900A Be.

  mass             900A Be                    900A Au
  cut(GeV) 1.82-1.90 1.66-2.06   none     1.82-1.90 1.66-2.06   none
           --------- --------- --------   --------- --------- --------
  >6.25    .74(.05)  .73(.03)  .74(.02)   .70(.05)  .72(.03)  .71(.02)
  >9.5     .81(.11)  .77(.06)  .75(.04)   .66(.09)  .70(.05)  .72(.03)
  >12.5    .86(.18)  .78(.09)  .75(.07)   .78(.18)  .72(.08)  .74(.06)
  >15.5    .88(.24)  .76(.12)  .75(.10)   .73(.22)  .70(.11)  .71(.08)

  OTHER NOTES

  I have not tried to reproduce everthing here. There are numerous old
  notes that I have sent out over the last year or so on various topics.
  I have tried to collect the ones I could find in p2hp3:~leitch/dadep/txt
    dadep2.txt - this note
    amon.txt - on the amon calibration and bkgd
    dsummary.txt - a complete summary from 2/10/93
    dsummold.txt - an older summary of cuts I used from 10/22/92
    eff.txt - trigger efficiency (11/13/92)
    normold.txt - some of the numbers used for normalization circa 11/9/92.
    dsummold2.txt - a very old summary before talk a Santa Fe DNP mtg (10/12/92)
    effold.txt - another note on trigger efficiency (12/16/92)

  I will place more things, if I find them there. Most, if not all, of these
  were sent to everyone at one time; and should be in your old mail also.