(r1) AlpgenGridProductionPage < Main

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---+!!Grid Production Page
%TOC%

---++ Introduction
Large scale ALPGEN event production cannot be made in a single step - a preliminary production has to be made, in order to allow ALPGEN to optimize its knowledge of the phase space structure. For a given process, this structure is constant and can be saved in what is called a *grid file*, to be reused for later productions of the same kind. This page describes some grid productions done at SPRACE and elsewhere, and has links to the relevant files.

---++ Grid Productions

---+++ TTbar + jets
   * Sample description: Top-antitop events.
   * Collider: proton-proton.
   * Center of mass energy: 10 !TeV.
   * Matching (ICKKW setting): yes (1).
   * Top mass: !175 !GeV
   * Top decay mode: fully inclusive.
   * ALPGEN version: 2.13
%TWISTY{mode="div" showlink="Template file" hidelink="Hide template file" remember="off" firststart="hide" showimgleft="%ICONURLPATH{toggleopen-small}%"  hideimgleft="%ICONURLPATH{toggleclose-small}%"}%
<verbatim>
1          ! generation mode
ttbar4j_40 ! string labeling the output files
0          ! start with: 0=new grid, 1=previous warmup grid, 2=previous generation grid
4000000  5 ! N(events)/iteration and N(iter's) for initial grid optimiz
50000000   ! number evts to generate
*** The above 5 lines provide mandatory inputs for all processes
*** (Comment lines are introduced by the three asteriscs)
*** The lines below modify existing defaults for the hard process under study
*** For a complete list of accessible parameters and their values,
*** input 'print 1' (to display on the screen) or 'print 2' to write to file
njets 4
ebeam 5000
ih2 1
ickkw 1
ptjmin 40
etajmax 5
drjmin 0.7
mt 175
ihvy 6
itdecmode 7
</verbatim>
%ENDTWISTY%

These grids were originally produced for the Summer 2008 Production for the CMS Collaboration. The thresholds for parton production were set at 30, 40 and 50 !GeV. The grids were produced for 0, 1, 2, 3 and 4 partons. The matching efficiencies quoted were derived with PYTHIA showering done inside the CMSSW framework (CMSSW version 2_2_3, PYTHIA version 6.416).

|Sample |Events / cycle|Cycles| Asked events | WGT events |WGT Xsec (pb)|Error (pb)| UNW events |UNW Xsec (pb)|Error (pb)| Unweighting efficiency | Matched events |Matching Xsec (pb)|Error (pb)| Matched efficiency|
|ttbar0j_30GeV |4000000|5|50000000|6462816|2.02E+03|1.06E+01|1136665|1.90E+02|9.47E-02|2.27E-002|702390|1.18E+02|5.85E-02|0.618|
|ttbar0j_40GeV |4000000|5|50000000|6462816|2.02E+03|1.06E+01|1136665|1.90E+02|9.47E-02|2.27E-002|795122|1.33E+02|6.63E-02|0.700|
|ttbar0j_50GeV |4000000|5|50000000|6462816|2.02E+03|1.06E+01|1136665|1.90E+02|9.47E-02|2.27E-002|860824|1.44E+02|7.18E-02|0.757|
|ttbar1j_30GeV |4000000|6|50000000|2120429|1.53E+03|9.33E+00|424774|1.64E+02|1.21E-01|8.50E-003|159965|6.18E+01|4.57E-02|0.377|
|ttbar1j_40GeV |4000000|6|50000000|2350711|1.17E+03|9.61E+00|453316|1.21E+02|8.66E-02|9.07E-003|194990|5.21E+01|3.73E-02|0.430|
|ttbar1j_50GeV |4000000|6|50000000|2585228|9.08E+02|9.70E+00|506646|9.37E+01|6.56E-02|1.01E-002|236252|4.37E+01|3.06E-02|0.466|
|ttbar2j_30GeV |4000000|7|50000000|190817|7.52E+02|7.57E+00|35558|8.73E+01|2.03E-01|7.11E-004|8410|2.06E+01|4.81E-02|0.237|
|ttbar2j_40GeV |4000000|7|50000000|237619|4.35E+02|7.89E+00|46028|4.94E+01|9.63E-02|9.21E-004|12701|1.36E+01|2.66E-02|0.276|
|ttbar2j_50GeV |4000000|7|50000000|298591|2.75E+02|8.07E+00|59939|3.07E+01|5.29E-02|1.20E-003|18102|9.27E+00|1.60E-02|0.302|
|ttbar3j_30GeV |4000000|8|50000000|262729|4.15E+02|8.65E+00|39244|3.49E+01|6.64E-02|7.85E-004|5835|5.19E+00|9.87E-03|0.149|
|ttbar3j_40GeV |4000000|8|50000000|376197|1.88E+02|9.15E+00|48051|1.54E+01|2.58E-02|9.61E-004|8515|2.74E+00|4.57E-03|0.177|
|ttbar3j_50GeV |4000000|8|50000000|339983|1.00E+02|9.82E+00|56262|7.87E+00|1.26E-02|1.13E-003|11006|1.54E+00|2.47E-03|0.196|
|ttbar4j_30GeV |4000000|9|50000000|208188|2.02E+02|1.03E+01|20263|1.15E+01|2.53E-02|4.05E-004|2760|1.56E+00|3.44E-03|0.136|
|ttbar4j_40GeV |4000000|9|50000000|155193|7.33E+01|1.13E+01|25736|4.04E+00|8.59E-03|5.15E-004|3854|6.05E-01|1.29E-03|0.150|
|ttbar4j_50GeV |4000000|9|50000000|180885|3.09E+01|1.14E+01|30121|1.71E+00|3.56E-03|6.02E-004|4854|2.75E-01|5.74E-04|0.161|

   * [[http://cmsdoc.cern.ch/~tomei/AlpgenProduction2008_ttbarjets.tar.gz][Grids for download]]

---+++ W + jets
---+++ Z + jets

-- Main.ThiagoTomei - 13 May 2009
Topic revision: r1 - 2009-05-13 - ThiagoTomei
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