HLT Studies - PowerPoint PPT Presentation

About This Presentation
Title:

HLT Studies

Description:

Muon PRS Group Darin Acosta ( Muon Guy ) University of Florida – PowerPoint PPT presentation

Number of Views:45
Avg rating:3.0/5.0
Slides: 12
Provided by: Dari55
Learn more at: http://www.phys.ufl.edu
Category:
Tags: hlt | guru | studies

less

Transcript and Presenter's Notes

Title: HLT Studies


1
Muon PRS Group Darin Acosta (Muon
Guy) University of Florida
2
Whos Involved?
  • In Europe
  • Ugo Gasparini et al. Generator studies, L2
  • Norbert Neumeister DB prodn, L1, L2
  • Anna Vitelli DB prodn, barrel muon
    reconstruction
  • Several others with lesser involvement
  • In the U.S. (Endcap Muon group)
  • D. Acosta, S.M. Wang (UFlorida) L1
  • R. Breedon, T. Cox (UCD) geometry, endcap
    recon.
  • B. Tannenbaum (UCLA) L1
  • R. Wilkinson (Caltech) endcap recon., general
    guru

3
HLT Milestones
  • November 1999
  • EMU missed completely. Insufficient time to
    develop code for geometry, digitization,
    persistence, and L1 from scratch in 6 months
  • July 2000
  • EMU sort of met it. All pieces were in place,
    and preliminary results shown, but not enough
    time for tuning (PT assignment), debugging, and
    optimization (code was too slow for out-of-time
    pile-up).
  • September 2000
  • Close to having all above issues resolved for
    dedicated L1 studies for the L1 TDR (due by Nov.)
  • But, goal line keeps moving more demands on L1
    trigger threshold definition (90 effic. vs. 50)

4
U.S. Experience (1)
  • EMU group works well together
  • Lots of e-mail exchanges, video conferences, and
    meetings to keep everyone informed and on-track
  • A real user group where you can post a message
    (even dumb ones) and get help
  • EMU code development for ORCA is entirely a U.S.
    effort, with only minor consultation from Anna,
    Norbert, Vincenzo,
  • We are heartened by Sarahs comments
  • US muon has this ORCA experience, which is
    one of the reasons I think they are so
    successful!
  • Because

5
U.S. Experience (2)
  • This development has been painful
  • Large C/ORCA/SCRAM learning curve to climb
    (makes it hard for newcomers to contribute)
  • ORCA is a moving target
  • Version doesnt stay stable long enough to
    finish bug fixes, tuning, and collect results.
  • e.g. ORCA3 ? ORCA4 was a major switch after the
    November 1999 HLT meeting. It took many months
    before basic code was ready, which left little
    time for L1 developers to complete their work.
    We still had to rush for the July HLT meeting
    despite it being 8 months later!
  • ORCA 4.2 ? ORCA 4.3 has also been frustrating.
    Objectivity schema changed after July meeting,
    and it took a while before it was made backward
    compatible with previous DBs so that studies
    could continue to prepare for L1 TDR studies
  • Clearly development must occur, but it would
    help users if the underlying architecture would
    stay stable

6
U.S. Experience (3)
  • Some of this pain stems from none of the EMU
    developers being based at CERN
  • Attending the weekly RPROM meeting is not
    enough. Must have a door to knock on to get
    advice.
  • Long distance code development is slow, but most
    of us have no other choice.
  • Teaching duties, other active experiments, etc.
  • Thus, EMU is not 100 ready at time of
    milestones
  • Preliminary results shown by European colleagues
    (using our code) mislead CMS Collaboration
  • i.e. Poor L1 efficiency in DT/CSC overlap, poor
    L1 PT resolution lots of bad PR that
    demoralizes group
  • Having a larger U.S. base of users and
    developers would improve efficiency of ORCA
    development

7
Recent Results
Nevertheless, we have obtained some results on L1
performance
95
Good efficiency in DT/CSC overlap region
8
More Work Needed
L1 PT resolution shows difference between ? and
?-
?
?-
9
Near-Term L1 HLT Goals
  • Must get Endcap Muon code perfected so that we
    can prepare efficiency and rate plots for the L1
    TDR that are representative of the system
    performance
  • Last few bugs must be fixed
  • HLT Muon databases will be re-made with latest
    code
  • No new MC needs to be produced in U.S. right now
  • Caltech, UCD, UFlorida have contributed CMSIM
    samples in the past
  • Objectivity database formatting Ntuple
    production done at CERN without U.S. EMU
    involvement
  • Norbert and Anna have done a lot of work on
    this, and have prepared the Ntuples used by the
    Muon groups. We should be doing more of this,
    particularly in preparing standard analysis jobs
    and Ntuples

10
Long-Term Plans
  • It would be nice to get the underlying EMU and
    L1 code finished so that we can move on to
    physics and HLT algorithms!
  • Hasnt happened in parallel because the EMU
    users are also the developers
  • My personal selection of topics
  • A fast L2 muon reconstruction package
  • Between that used by L1 and that used in offline
    analysis
  • A study of the reconstruction of muons in b-jets
  • Many important signals couple to bs Higgs,
    SUSY,
  • Accompanying punch-through debris will
    deteriorate performance
  • Studies of your favorite physics topic that
    couples to muons
  • Higgs H?4l, H?????, WH ???bb, ZH ???bb
  • SUSY ??0 ? 3l MET

11
Summary
  • Clearly the Muon PRS group could use more
    involvement from people in the U.S.
  • Current members are over-stressed with demands
  • Many more things we could be doing but havent
  • L2 algorithms, physics studies,
  • Might be a good training ground for new students
    before they commit to an analysis on CDF/D0
  • But there is a significant learning curve to
    overcome to become effective
  • Requires a lot of time, a lot of patience
  • Weve started a good collaboration in the U.S.
  • Future members shouldnt have to suffer as much
    as we did!
Write a Comment
User Comments (0)
About PowerShow.com