Photon-jet simulation request

Simulation needs with y2006/y2009 geometry
specific to the photon-jet analysis

* Update version of the previous simulation
request from December 18, 2008 (see Ref. [1])

Understanding effects of trigger, material budget differences,
and throughout comparison between 2006 and 2009 data
requires to have dedicated Monte-Carlo
data samples with both y2006 and y2009 geometries.

Requested samples

We request to produce the following set of
Monte-Carlo samples for the photon-jet analysis:

  • S1: 1st priority

    Dedicated (gamma filtered, Refs. [2-5]) data sample
    for Pythia pp@200GeV prompt photon processes
    with y2006 STAR geometry configuration
    and partonic pt range 2-25GeV.

    Simulations configured with:

    • LOW_EM option in starsim (Ref. [6]).
      Low cuts on electromagnetic processes in GSTAR

    • y2006h geometry tag, which includes
      latest Endcap EMC (v6.1) and TPC (v4) geometry fixes.

    • Pythia 6.4 CDF Tune A or Perugia tunes (6.4.22)?

  • S2: 1st priority

    Dedicated (gamma filtered, Refs. [2-5]) data sample
    for Pythia pp@200GeV hard QCD processes
    with y2006 STAR geometry configuration
    and partonic pt range 2-25GeV.

    Same simulation setup as for the sample S1.

  • S3: 2nd priority

    Pythia pp@200GeV prompt photon and hard QCD
    processes with y2009 STAR geometry configuration
    and partonic pt range 2-25GeV.

    Same simulation setup as for the sample S1
    but with y2009a geometry tag.

  • S4: 3rd priority

    Pythia pp@500GeV prompt photon and hard QCD
    processes with y2009 STAR geometry configuration
    and partonic pt range 2-25GeV.

    Same simulation setup as for the sample S1
    but with y2009a geometry tag.

Event number, CPU time, and disk space estimates

Below I provide some estimates of CPU and disk space
which are required to produce the data samples listed above.
These estimates are based on the previous (private)
production of the MC gamma-filtered events with y2006
geometry which was done at MIT computer cluster
by Michael Betancourt (Ref. [2,4-5]):

  • E1 (prompt photons)

    Pythia pp@200GeV prompt photon simulations
    with ~7 pb^-1 luminosity:

    • ~60 days running time on a single CPU

    • ~17Gb of disk space to store MuDst/geant files

    • Number of (filtered) events:
      ~ 30K for pt range 6-9GeV
      ~ 15K for pt range 9-15GeV

  • E2 (QCD hard process)

    Pythia pp@200 QCD hard process simulations
    with (at least) 1 pb^-1 luminosity:

    • ~ 620 days running on a single CPU
      (less than a week on a cluster with 100 CPUs)

    • ~ 150Gb of disk space to store MuDst/geant files

    • Number of (filtered) events:
      ~ 650K for pt range 6-9GeV
      ~ 300K for pt range 9-15GeV

Notes on the estimates:

  • N1

    Enabling LOW_EM option in GSTAR increases
    the time estimates by ~40% (Ref. [7]).

  • N2

    Additional production of jet trees will
    require a disk space on the order of < 2%
    of the total size of the MuDst/geant files.

  • N3

    Additional production of gamma trees will also
    require a disk space on the order of a few percents
    of the total size of the MuDst/geant files.

References

  1. Previous simulation request (Date: 2008, Dec 18):
    http://www.star.bnl.gov/HyperNews-star/protected/get/starspin/3596.html

  2. Michael's document on
    "Targeted MC procedure for the gamma-jet program at STAR":
    http://drupal.star.bnl.gov/STAR/system/files/20080729_gammaFilter_by_MichaelBetancourt.pdf

  3. simulations with filtering readiness:
    http://www.star.bnl.gov/HyperNews-star/protected/get/starsimu/387/1/1/2/1/1/2/3/1.html

  4. Filtered photon production with y2006 geometry:
    http://www.star.bnl.gov/HyperNews-star/protected/get/phana/256.html

  5. More details on statistics needed and disk space estimates:
    http://www.star.bnl.gov/HyperNews-star/protected/get/phana/297.html

  6. LOW_EM option in GSTAR:
    http://www.star.bnl.gov/HyperNews-star/protected/get/phana/371.html

  7. Time estimates with and without LOW_EM option: