ALPGEN MC Generation at SPRACE - Grid Production

Introduction
Grid Productions

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. The production of a grid file consists of a series of warm-up cycles (~5 to 10) of the generator, each cycle generating O(1M) events, followed by the production of O(10M) of events. 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

Template file

Hide template file

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

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)	Matching 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

Grids for download

W + jets

Z + jets

-- ThiagoTomei - 13 May 2009

Topic revision: r5 - 2009-06-05 - ThiagoTomei

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