CMS Alpgen sample generation (mostly 2006)

The samples which are listed on this page were supposed to be finished for P-TDR II studies. They have been simulated only partially in ORCA but will be simulated in the new EDM as soon as the production team is ready to take requests.

However, these ntuple files can be used directly as input for fast simulation studies.

Preamble

  • An adapted version of CRAB has been provided to perform the generation on the LCG. The version which has been used for the datasets summarized on this page was CRAB_for_Alpgen_8 and was written by Daniele Spiga and Filippo Ambroglini.

  • The default kinematic cuts in Alpgen are
    • Pt (j,c,b) > 20 GeV
    • |eta (j,c,b)| < 5.0
    • |eta (e,mu,tau)| < 3.0
    • dR(jj) >= 0.7
    • dR(lj) >= 0.0
    • M_top = 175 GeV

  • Due to a bug in Alpgen v2.05, the Q-scale choices iqopt=1 and iqopt=3 were swapped for the processes WQQ, ZQQ, Wjet and Zjet.

  • CMKIN 6.0.1 was used to process the ME/PS matching within PYTHIA.

  • The directory /castor/cern.ch/cms/generation/alpgen205-crab/ contains the crab output as tar balls.

  • You can find the corresponding ntuples in /castor/cern.ch/cms/generation/alpgen205-prod06/.

  • The generated events are spilt in ntuples of usually 500 events each. But there are also ntuple files with less events (especially for higher jet multiplicities).

Samples

tt + jets (top is allowed to decay inclusively)

subprocess sigma (pb) events Number... ...and location of ntuples Conversion Status
tt + 0 j (excl) 190 3.336.000 6.672 /castor/cern.ch/cms/generation/alpgen205-prod06/ttj/tt0j Done
tt + 1 j (excl) 170 3.259.500 6.519 /castor/cern.ch/cms/generation/alpgen205-prod06/ttj/tt1j Done
tt + 2 j (excl) 100 331.500 663 /castor/cern.ch/cms/generation/alpgen205-prod06/ttj/tt2j Done
    736.000 1.472 /castor/cern.ch/cms/generation/alpgen205-prod06/ttj/tt2j_add NO
tt + 3 j (excl) 40 125.000 250 /castor/cern.ch/cms/generation/alpgen205-prod06/ttj/tt3j Done
tt + 4 j (incl) 61 186.000 372 /castor/cern.ch/cms/generation/alpgen205-prod06/ttj/tt4j-inc Done

[Spiropulu, Chierici, Schmidt]

W + jets (W --> e,mu,tau)

subprocess sigma (pb) events Number... ...and location of ntuples Conversion Status
W + 0 j (excl) 30.000 7.185.500 14.371 /castor/cern.ch/cms/generation/alpgen205-prod06/wjets/w0j Done
W + 1 j (excl) 8.000 7616000 15232 /castor/cern.ch/cms/generation/alpgen205-prod06/wjets/w1j Done
W + 2 j (excl) 2.500 2.865.000 5.730 /castor/cern.ch/cms/generation/alpgen205-prod06/wjets/w2j Done
W + 3 j (excl) 722 523.500 1.047 /castor/cern.ch/cms/generation/alpgen205-prod06/wjets/w3j Done
W + 4 j (excl) 174 159.000 318 /castor/cern.ch/cms/generation/alpgen205-prod06/wjets/w4j Done
W + 5 j (excl) 45 248.000 496 /castor/cern.ch/cms/generation/alpgen205-prod06/wjets/w5j Done
W + 6 j (incl) 31 19.800 48 /castor/cern.ch/cms/generation/alpgen205-prod06/wjets/w6j Done

[Segoni, Kasselmann]

Z + jets (Z --> ee/mumu/tautau, 40 GeV < m_ll < 200 GeV)

subprocess sigma (pb) events Number... ...and location of ntuples Conversion Status
Z + 0j (excl) 2.436 ~ 20.000.000 40.198 /castor/cern.ch/cms/generation/alpgen205-prod06/zjets/z0j Done
Z + 1j (excl) 670 ~ 2.900.000 5.812 /castor/cern.ch/cms/generation/alpgen205-prod06/zjets/z1j* Done (Use Spring07_COMMON_ALPGEN_z1j_GEN_2)
Z + 2j (excl) 230 ~ 2.900.000 5.756 /castor/cern.ch/cms/generation/alpgen205-prod06/zjets/z2j Done
Z + 3j (excl) 66 ~ 3.300.000 6.560 /castor/cern.ch/cms/generation/alpgen205-prod06/zjets/z3j Done
Z + 4j (excl) 17 ~ 410.000 838 /castor/cern.ch/cms/generation/alpgen205-prod06/zjets/z4j Done
Z + 5j (excl) 4.0 ~ 140.000 285 /castor/cern.ch/cms/generation/alpgen205-prod06/zjets/z5j Done
Z + 6j (incl) 3.1 ~ 25.000 99 /castor/cern.ch/cms/generation/alpgen205-prod06/zjets/z6j Done

*These files are named falsely. Don't get confused!

Configuration parameters can be found in /castor/cern.ch/cms/generation/alpgen205-crab/zjets/crab-input/

[Felzmann]

Z + jets Run II

subprocess sigma (pb) events Number... ...and location of ntuples
Z + 3j (excl) 66 11.874.000 23.748 /castor/cern.ch/cms/generation/alpgen205-prod06/zjets_RunII/z3j
Z + 4j (excl) 17 1.859.000 3.718 /castor/cern.ch/cms/generation/alpgen205-prod06/zjets_RunII/z4j
Z + 5j (excl) 4.0 536.500 1.073 /castor/cern.ch/cms/generation/alpgen205-prod06/zjets_RunII/z5j
Z + 6j (incl) 3.1 340.000 720 /castor/cern.ch/cms/generation/alpgen205-prod06/zjets_RunII/z6j

Just some more ntuples generated with exactly the same parameters as the previous run to get more statistics for bins with high jet multiplicity.

[Felzmann]

WW + jets (both Ws decay leptonically into e/mu/tau)

subprocess sigma (pb) events Number... ...and location of ntuples Conversion Status
WW + 0 j (excl) 5.0 200.000 400 /castor/cern.ch/cms/generation/alpgen205-prod06/WWjets/WW0j Done
WW + 1 j (excl) 2.6 90.000 180 /castor/cern.ch/cms/generation/alpgen205-prod06/WWjets/WW1j Done
WW + 2 j (excl) 1.22 15.000 30 /castor/cern.ch/cms/generation/alpgen205-prod06/WWjets/WW2j Done
WW + 3 j (incl) 1.66 17.000 34 /castor/cern.ch/cms/generation/alpgen205-prod06/WWjets/WW3j Done

[Karapostoli]

WZ + jets (W --> inclusive, Z --> ee/mumu/tautau)

subprocess sigma (pb) events Number... ...and location of ntuples Conversion Status
WZ + 0 j (excl) 1.70 17.000 34 /castor/cern.ch/cms/generation/alpgen205/WZjets/WZ0j NO
WZ + 1 j (excl) 1.14 12.000 24 /castor/cern.ch/cms/generation/alpgen205/WZjets/WZ1j NO
WZ + 2 j (excl) 0.61 10.000 20 /castor/cern.ch/cms/generation/alpgen205/WZjets/WZ2j NO
WZ + 3 j (incl) 0.85 58.500 117 /castor/cern.ch/cms/generation/alpgen205/WZjets/WZ3j NO

[Karapostoli]

ZZ + jets (Z --> inclusive, Z --> ee/mumu/tautau)

subprocess sigma (pb) events Number... ...and location of ntuples Conversion Status
ZZ + 0 j (excl) 1.45 426.000 852 /castor/cern.ch/cms/generation/alpgen205-prod06/ZZjets/zz0j Done
ZZ + 1 j (excl) 0.68 209.000 419 /castor/cern.ch/cms/generation/alpgen205-prod06/ZZjets/zz1j Done
ZZ + 2 j (excl) 0.27 259.000 518 /castor/cern.ch/cms/generation/alpgen205-prod06/ZZjets/zz2j Done
ZZ + 3 j (incl) 0.23 50.500 101 /castor/cern.ch/cms/generation/alpgen205-prod06/ZZjets/zz3j Done

These ntuples have been generated using the bug fix for ALPGEN version 2.05 provided by MLM correcting the wrong branching ratios in ZZ decays.

ZZbug.txt: Z decay modes in ALPGEN2.05 ZZ+jets

[Felzmann]

Notes

  • Cross section is given in pb after matching.

  • To calculate the corresponding luminosity in fb-1, divide the number of events by the cross section and multiply the result by 0.001.

  • "Exclusive" means exactly n hard jets (according to the ALPGEN jet definition) are generated in the hard process, "inclusive" means n hard jets and more (usually one extra jet is correctly simulated by the parton shower). After the showering evolution the number of jets does not necessarily match with this number anymore!

  • To cover a complete multijet sample, you have to run over over all exclusive samples + highest bin inclusive (taking into account their respective cross sections).

-- Main.felzmann - 01 Jan 2007

Topic attachments
I Attachment History Action Size Date Who Comment
Texttxt AlpPar.txt r1 manage 3.4 K 2007-01-17 - 10:52 UnknownUser CMS Alpgen default parameter set
Texttxt ZZbug.txt r1 manage 1.2 K 2007-01-17 - 10:46 UnknownUser Z decay modes in ALPGEN2.05 ZZ+jets
Edit | Attach | Watch | Print version | History: r24 < r23 < r22 < r21 < r20 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r24 - 2007-07-10 - unknown
 
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    Main All webs login

This site is powered by the TWiki collaboration platform Powered by PerlCopyright & 2008-2020 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback