A text summary of each talk is given below.  The transparencies can be
found at:
<br><a href="./abdullin/"> Salavat's </a>
<br><a href="./krokhotine/"> Andrei's </a>
<br><a href="./graham/"> Greg's </a>
<br><a href="./eno/"> Sarah's </a>



<plaintext>



   Minutes of the Mar 28, 2001 Jet/Met meeting
   -------------------------------------------

Attendence: Sarah Eno, Pam Chumney, Greg Graham, Pal Hidas, Irwin Gaines,
Salavat Abdullin, Paris Sphicas, Sasha Nikitenko, Ritva Kinnunen,
Mehmet Zeyrek, Ian Fisk, Andrei Krokhotine, Alexei Oulianov







                        Agenda
                        ------
             Update on HCAL electronics simulation - Salavat Abdullin
             Update on jet energy scale and fake jets - Andrei Krokhotine
             Physicist interface to production - Greg Graham
             Next Production - Sarah Eno



Update on HCAL electronics simulation - Salavat Abdullin
  Salavat presented an update on his work to properly simulate the HCAL
  readout within ORCA.  He has made many changes, though these changes
  have not yet been incorporated into an official ORCA release.
  He changed the algorithm that is used to extract the energy from
  the time samples from the ECAL scheme (where the weights are optimized
  to reduce the effect of the simulated electronic noise) to a more
  simple one, which could actually be implemented in the hardware.
  The weights are now (-1.5,-1.5,1,1,1) in the trigger primitives, and
  (-2,-2,1,1,1,1) for the DAQ path.  He has also changed the centering
  of the HCAL pulse so that there are two bins with approximately equal
  pulse height.  The ECAL-like version centered it so that one bin
  had the biggest amplitude (so, the current beam crossing id algorithm
  for L1 will have to be altered, or turned off before this new code
  can be used, since it is based on the ECAL shape).  Also, in the old
  code, the HF readout was assumed to be identifical to the HB/HE.  However,
  they are actually quite different.  Salavat has separated the HF
  and put in his best knowledge of the its readout.  However, he needs
  a contact person in the HF group, to check that his information about
  the HF is correct.  None of these changes are expected to have a big
  effect on trigger rates or resolutions.

  However, the change that he put in that may have a big effect.  He
  is now using new noise levels, provided to him from John Elias, that
  significantly increase the amoun to of noise in the HE/HB.  He now
  sees quite a few towers with noise > 1-6 GeV.  We need to check to
  see how this will affect the level 1 tau identification, and the MET
  resolution.  We asked Salavat to generate a small tau sample with
  the new and old code, and a small minimum bias sample, to check MET.
  Salavat wanted to wait until he got more final numbers from Elias.
  Sarah said she sent a mail to Kunori, asking him to urge Elias to pass
  the more final numbers on to Salavat.

  Salavat is also working with Vincenzo to find ways to speed up the
  code.

Update on jet energy scale and fake jets - Andrei Krokhotine
  
  Andrei noticed that even when you apply jet energy corrections
  to the QCD jets in the HLT sample, you do not recover the
  generator-level jet spectra because of smearing.  He thought of a
  way to undo the effects of this smearing, which is not generally
  applicable, but which one could tune for the physics sample you
  were interested in.

Physicist interface to production - Greg Graham

  Greg is working on method to insure quality control on a production
  system that is spread out all over the world.   He especially would like
  input from the physics groups on two issues:  a standard way to
  setup and document the input cards to the generators, and on ways of
  validating the output.  Greg presented a first design of a methodology
  for specifying the card files to the generator.  He needs to provide
  us with some documentation, and then we will try to have the
  various physicists who are making production requests for the "next"
  production to try it out, and give their comments.

  Sarah urged early coordination with the russian and helsinki groups,
  as we don't want the physicists to have to specify things one way
  for european production centers, and another for US ones.

  



Next Production - Sarah Eno
  Sarah showed some preliminary requests for our next production.
  
  She encouraged people to attend the CPT week April 23-27

  We have heard that many software types are not planning on going
  to the CMS week in Sicily. So, we are also proposing a jet/met/hcal
  meeting at CERN just before, june 13-15.  People are strongly 
  encouraged to attend this meeting.