MPI Analysis using 4 jet events
Some helpful links
- The current version of the analyzer code can be found in CVS, here
.
Analysis overview
The intention of this analysis is to make a measurement of the rate of secondary hard scatterings in a single nuclear interaction typically referred to as double parton scattering (DPS). Our study is modelled very closely on a similar study by the CDF collaboration published in 1993 (see links). Their approach can be summarised as utilising so called discriminator variable to characterise the differences in the topology of events involving 4 jets for the case that there is DPS and when there is only a single interaction. This is explained in more detail in the analysis notes, link to AN.Standard selection cuts
- number of primary vertices = 1
- vertex |z| ≤ 20
- vertex number of DOF ≥ 4
- number of jets ≥ 4
- |η| < 2.4
- number of jet constituents > 1
- number of charged constituents > 0
- charged hadron fraction > 0
- neutral fraction < 0.9
- pT > 20 GeV
- pT,1 + pT,2 > 75 GeV
Datasets
- NOTE : There is a preselection applied while producing ntuples which requires that there be two jets with pT > 5 GeV in each event. The preselection also includes the selection of good lumi sections within the specified run range.
| Dataset name | Ninit (106) | Npreselected (106) | Nfinal/ Npreselected (Standard selection) | Integrated luminosity (nb-1) | Cross-section (nb) |
|---|---|---|---|---|---|
| Data | |||||
| /MinimumBias/Commissioning10-Sep17ReReco_v2/RECO (132440 - 135575) | 572 | 19.4 | 0.021% | 7.73 | --- |
| /JetMETTau/Run2010A-Nov4ReReco_v1/RECO ( 136035 - 137028) | 15.04 | 0.78 | 0.34% | 5.09 | --- |
| MC - Pythia8 | |||||
| /QCD_Pt_15to30_Tune1_7TeV_pythia8/Fall10-START38_V12-v1/GEN-SIM-RECO | 1.1 | 1.1 | 0.003% | 1.41 | 780000 |
| /QCD_Pt_30to50_Tune1_7TeV_pythia8/Fall10-START38_V12-v1/GEN-SIM-RECO | 1.1 | 1.1 | 0.7% | 21.87 | 50300 |
| /QCD_Pt_50to80_Tune1_7TeV_pythia8/Fall10-START38_V12-v1/GEN-SIM-RECO | 1.1 | 1.1 | 7.1% | 180.8 | 6030 |
| /QCD_Pt_80to120_Tune1_7TeV_pythia8/Fall10-START38_V12-v1/GEN-SIM-RECO | 1.1 | 1.1 | 19% | 1459 | 751 |
| /QCD_Pt_120to170_Tune1_7TeV_pythia8/Fall10-START38_V12-v1/GEN-SIM-RECO | 0.88 | 0.88 | 29% | 7857 | 112 |
| MC - Pythia6 | |||||
| /QCD_Pt_15to30_TuneZ2_7TeV_pythia6/Fall10-START38_V12-v1/GEN-SIM-RECO | 5.45 | 5.44 | 0.002% | 6.68 | 815900 |
| /QCD_Pt_30to50_TuneZ2_7TeV_pythia6/Fall10-START38_V12-v1/GEN-SIM-RECO | 3.26 | 3.26 | 0.5% | 61.37 | 53120 |
| /QCD_Pt_50to80_TuneZ2_7TeV_pythia6/Fall10-START38_V12-v1/GEN-SIM-RECO | 3.19 | 3.19 | 4.9% | 501.8 | 6360 |
| /QCD_Pt_80to120_TuneZ2_7TeV_pythia6/Fall10-START38_V12-v1/GEN-SIM-RECO | 3.21 | 3.21 | 13% | 4090.3 | 784.3 |
| /QCD_Pt_120to170_TuneZ2_7TeV_pythia6/Fall10-START38_V12-v1/GEN-SIM-RECO | 3.05 | 3.05 | 21% | 26499 | 115.1 |
| Tune D6T | |||||
| /QCD_Pt_15to30_TuneZ2_7TeV_pythia6/Fall10-START38_V12-v1/GEN-SIM-RECO | 2.0 | 236000 | |||
| /QCD_Pt_30to50_TuneZ2_7TeV_pythia6/Fall10-START38_V12-v1/GEN-SIM-RECO | 0.5 | 53110 | |||
| /QCD_Pt_50to80_TuneZ2_7TeV_pythia6/Fall10-START38_V12-v1/GEN-SIM-RECO | 0.5 | 7130 |
Trigger
| Trigger name | Bit position |
|---|---|
| HLT_L1_BscMinBiasOR_BptxPlusORMinus | 1 |
| HLT_L1Jet6U | 2 |
| HLT_L1Jet10U | 3 |
| HLT_Jet15U | 4 |
| HLT_Jet30U | 5 |
| HLT_Jet50U | 6 |
| HLT_Jet70U | 7 |
| HLT_Jet100U | 8 |
| HLT_FwdJet20U | 9 |
| HLT_Jet15U_HcalNoiseFiltered | 10 |
| HLT_BTagIP_Jet50U | 11 |
| HLT_DiJetAve15U | 12 |
| HLT_DiJetAve30U | 13 |
| HLT_DiJetAve50U | 14 |
| HLT_DoubleJet15U_ForwardBackward | 15 |
| HLT_QuadJet15U | 16 |
| HLT_HT100U | 17 |
| HLT_Mu9 | 18 |
| HLT_Mu11 | 19 |
| HLT_Mu13 | 20 |
| HLT_Mu15 | 21 |
| HLT_Ele10_LW_L1R | 22 |
| HLT_Ele15_SW_L1R | 23 |
| HLT_Ele15_SW_CaloEleId_L1R | 24 |
| HLT_Ele17_SW_CaloEleId_L1R | 25 |
| HLT_Ele15_SW_TightEleId_L1R | 26 |
Our conclusion is to requrie the sum pT of the leading two jets be greater than 75 GeV.
Jet Energy Scale
Jet corrections are applied according to the prescribed methods on the jet correction twiki page. Things that need to be done here are:- Include residual corrections.
- Include JEC uncertainties that are stored in the dataset. Propagate these to find the effect on our fits.
Generator level studies
- Some simple overlays of pythia8 QCD with and without a DPS enrichment, here.
Data/MC comparisons
Standard selection
Using JetMETTau stream data with runNumber <= 137208 and selecting HLT_Jet15U, the yield is| Selection | NEvents | |
|---|---|---|
| Initial number of events: | 801803 | |
| Pass HLT selection | 754542 | |
| One and only one primary vertex: | 552959 | |
| Vertex displacement in z < cm: | 552746 | |
| Vertex ndof >= 4: | 552415 | |
| abs(η) < 2.4 : | 323067 | |
| Miscellaneous jet quality cuts: | 313393 | |
| p_{T,1/2} > 20 GeV and p_{T,3/4} > 20: | 3906 | |
| p_{T,1} + p_{T,2} > 75 GeV: | 2644 | |
| Final number of events: | 2644 |
.
Older comparisons are here and here.
Isolated dijet pair selection
We take an alternative approach which picks out events that are "signal"-like, i.e., they consist of two isolated dijet pairs. The isolation selection requires the pair consisting of the leading two jets (j1 and j2) be in the opposite side of the detector (w.r.t. eta) than the pair made up of the next two jets (j3 and j4). We then also require that the Δφ of the jets in each pair be greater than 2.0. Hence we have two isolated dijet pairs. This selection greatly reduces the number of selected events so we lower the pT threshold on j3 and j4 to 10 GeV. Results are here. This was expanded to include the effects of a scan on the minimum sum pT of the second pair. Results are here.
Old comparisons
| Data | Runs |
|---|---|
| /MinimumBias/Comissioning10-SD_JetMETTau-Jun14thSkim_v1/RECO | 132440 - 135807 |
| /JetMETTau/Run2010A-Jun14thReReco_v2/RECO | 135808 - 137546 |
| MC | |
| /QCD_Pt-15_7TeV-pythia8/Spring10-START3X_V26B-v2/GEN-SIM-RECO | |
| /QCD_Pt-20_TuneD6T_7TeV-pythia6/Summer10-START36_V10-v1/GEN-SIM-RECO |
| Selection cut | Data | Pythia 8 | Pythia 6 | Signal |
|---|---|---|---|---|
| Initial number of events: | 1286731 | 3866466 | 4650673 | |
| Pass HLT selection | 1222406 | 791134 | 1961961 | |
| One and only one primary vertex: | 1076132 | 751180 | 1893103 | |
| Vertex displacement in z < 15 cm: | 1075551 | 751180 | 1893102 | |
| Vertex ndof >= 4: | 1075407 | 751165 | 1893076 | |
| abs(η) < 2.4: | 749475 | 458647 | 1282702 | |
| Miscellaneous jet quality cuts: | 742030 | 455035 | 1272134 | |
| p_{T} > 20 GeV: | 11302 | 10227 | 30545 | |
| p_{T,1} + p_{T,2} > 70 GeV: | 8543 | 8026 | 20415 | |
| 5th jet pt < 15: | 4624 | 3845 | 11123 |
JMT on QCD
- NOTE: The leading jet pT cut was raised to 35 GeV.
| Data | Runs |
| /MinimumBias/Comissioning10-SD_JetMETTau-Jun14thSkim_v1/RECO | 132440 - 135807 |
| /JetMETTau/Run2010A-Jun14thReReco_v2/RECO | 135808 - 137546 |
| MC | |
| /QCD_Pt-15_7TeV-pythia8/Spring10-START3X_V26B-v2/GEN-SIM-RECO |
Kinematic quantities
pT for four leading jets: jet 1
, jet 2
, jet 3
, jet 4
Discriminator variables
MinBias on QCD
| Data | Runs |
| /MinimumBias/Commissioning10-Jun14thReReco_v1/RECO | 132440 - 135807 |
| /MinimumBias/Run2010A-Jun14thReReco_v2/RECO | 135808 - 137546 |
| MC | |
| /QCD_Pt-15_7TeV-pythia8/Spring10-START3X_V26B-v2/GEN-SIM-RECO | N/A |
Kinematic quantities
pT for four leading jets: jet 1
, jet 2
, jet 3
, jet 4
Discriminator variables
Data/Data comparisons for leading jet pT > 20 GeV and pT > 35 GeV
Some kinematic quantities
pT for four leading jets: jet 1
, jet 2
, jet 3
, jet 4
Discriminator variables
Comparison of MC with DPS on and off
Comparisons for various pT cuts from June 2010 are here.
Discriminator variables
Comparison of SpT' for MC generated with phase space pT,min = 50 GeV/c or 20 GeV/c.
- Cuts applied are pT > 15 GeV and |η| < 2.5.
- MC samples were generated using Pythia8 with the following options in the config file:
PythiaParameters = cms.PSet(
processParameters = cms.vstring('Main:timesAllowErrors = 10000',
'ParticleDecays:limitTau0 = on',
'ParticleDecays:tau0Max = 10.',
'Beams:allowVertexSpread = on',
'PhaseSpace:pTHatMin = 50.',
'HardQCD:all = on',
'SecondHard:generate = on',
'SecondHard:TwoJets = on'
Phase space p;T,min = 50 GeV:
*------- PYTHIA Process Initialization --------------------------* | | | We collide p+ with p+ at a CM energy of 7.000e+03 GeV | | | |------------------------------------------------------------------| | | | | Subprocess Code | Estimated | | | max (mb) | | | | |------------------------------------------------------------------| | | | | g g -> g g 111 | 2.241e-02 | | g g -> q qbar (uds) 112 | 3.144e-04 | | q g -> q g 113 | 2.731e-02 | | q q(bar)' -> q q(bar)' 114 | 3.688e-03 | | q qbar -> g g 115 | 2.894e-05 | | q qbar -> q' qbar' (uds) 116 | 1.430e-05 | | g g -> c cbar 121 | 1.046e-04 | | q qbar -> c cbar 122 | 4.761e-06 | | g g -> b bbar 123 | 1.027e-04 | | q qbar -> b bbar 124 | 4.715e-06 | | | | *------- End PYTHIA Process Initialization -----------------------* *------- PYTHIA Multiple Interactions Initialization ------------* | | | sigmaNonDiffractive = 48.45 mb | | | | pT0 = 3.12 gives sigmaInteraction = 152.06 mb: accepted | | | *------- End PYTHIA Multiple Interactions Initialization --------* PYTHIA Warning in MultipleInteractions::init: maximum increased by factor 1.539 *------- PYTHIA Flag + Mode + Parm + Word Settings (changes only) ----------------------------------------------* | | | Name | Now | Default Min Max | | | | | | Beams:allowVertexSpread | on | off | | HardQCD:all | on | off | | Main:timesAllowErrors | 10000 | 10 0 | | ParticleDecays:limitTau0 | on | off | | PhaseSpace:pTHatMin | 50.00000 | 0.0 0.0 | | SecondHard:generate | on | off | | SecondHard:TwoJets | on | off | | | *------- End PYTHIA Flag + Mode + Parm + Word Settings ---------------------------------------------------------* Begin processing the 1st record. Run 1, Event 1, LumiSection 1 at 19-May-2010 00:32:23 CDT ... *------- PYTHIA Event and Cross Section Statistics --------------------------------------------------------* | | | Subprocess Code | Number of events | sigma +- delta | | | Tried Selected Accepted | (estimated) (mb) | | | | | |------------------------------------------------------------------------------------------------------------| | | | | | First hard process: | | | | | | | | g g -> g g 111 | 675 91 79 | 2.553e-07 2.860e-08 | | g g -> q qbar (uds) 112 | 5 0 0 | 0.000e+00 0.000e+00 | | q g -> q g 113 | 789 75 61 | 2.295e-07 2.762e-08 | | q q(bar)' -> q q(bar)' 114 | 122 13 10 | 3.592e-08 7.921e-09 | | q qbar -> g g 115 | 0 0 0 | 0.000e+00 0.000e+00 | | q qbar -> q' qbar' (uds) 116 | 0 0 0 | 0.000e+00 0.000e+00 | | g g -> c cbar 121 | 7 2 0 | 0.000e+00 0.000e+00 | | q qbar -> c cbar 122 | 0 0 0 | 0.000e+00 0.000e+00 | | g g -> b bbar 123 | 5 0 0 | 0.000e+00 0.000e+00 | | q qbar -> b bbar 124 | 0 0 0 | 0.000e+00 0.000e+00 | | | | | | sum | 1603 181 150 | 5.207e-07 5.362e-08 | | | | | |------------------------------------------------------------------------------------------------------------| | | | | | Second hard process: | | | | | | | | g g -> g g 111 | 667 74 60 | 2.327e-07 2.762e-08 | | g g -> q qbar (uds) 112 | 8 2 1 | 2.542e-09 2.552e-09 | | q g -> q g 113 | 806 84 72 | 2.317e-07 2.693e-08 | | q q(bar)' -> q q(bar)' 114 | 112 18 15 | 4.645e-08 8.685e-09 | | q qbar -> g g 115 | 0 0 0 | 0.000e+00 0.000e+00 | | q qbar -> q' qbar' (uds) 116 | 1 1 1 | 8.626e-10 8.661e-10 | | g g -> c cbar 121 | 3 2 1 | 2.000e-09 2.008e-09 | | q qbar -> c cbar 122 | 1 0 0 | 0.000e+00 0.000e+00 | | g g -> b bbar 123 | 2 0 0 | 0.000e+00 0.000e+00 | | q qbar -> b bbar 124 | 0 0 0 | 0.000e+00 0.000e+00 | | | | | | sum | 1600 181 150 | 5.162e-07 5.332e-08 | | | | | |------------------------------------------------------------------------------------------------------------| | | | Uncombined cross sections for the two event sets were 6.412e-03 and 6.453e-03 mb, respectively, combined | | using a sigma(nonDiffractive) of 4.845e+01 mb and an impact-parameter enhancement factor of 1.459e+00. | | | *------- End PYTHIA Event and Cross Section Statistics -----------------------------------------------------*
*------- PYTHIA Process Initialization --------------------------* | | | We collide p+ with p+ at a CM energy of 7.000e+03 GeV | | | |------------------------------------------------------------------| | | | | Subprocess Code | Estimated | | | max (mb) | | | | |------------------------------------------------------------------| | | | | g g -> g g 111 | 2.241e-02 | | g g -> q qbar (uds) 112 | 3.144e-04 | | q g -> q g 113 | 2.731e-02 | | q q(bar)' -> q q(bar)' 114 | 3.688e-03 | | q qbar -> g g 115 | 2.894e-05 | | q qbar -> q' qbar' (uds) 116 | 1.430e-05 | | g g -> c cbar 121 | 1.046e-04 | | q qbar -> c cbar 122 | 4.761e-06 | | g g -> b bbar 123 | 1.027e-04 | | q qbar -> b bbar 124 | 4.715e-06 | | | *------- End PYTHIA Process Initialization -----------------------* *------- PYTHIA Multiple Interactions Initialization ------------* | | | sigmaNonDiffractive = 48.45 mb | | | | pT0 = 3.12 gives sigmaInteraction = 151.76 mb: accepted | | | *------- End PYTHIA Multiple Interactions Initialization --------* PYTHIA Warning in MultipleInteractions::init: maximum increased by factor 1.541 *------- PYTHIA Flag + Mode + Parm + Word Settings (changes only) ----------------------------------------------* | | | Name | Now | Default Min Max | | | | | | Beams:allowVertexSpread | on | off | | HardQCD:all | on | off | | Main:timesAllowErrors | 10000 | 10 0 | | ParticleDecays:limitTau0 | on | off | | PhaseSpace:pTHatMin | 50.00000 | 0.0 0.0 | | | *------- End PYTHIA Flag + Mode + Parm + Word Settings ---------------------------------------------------------* Begin processing the 1st record. Run 1, Event 1, LumiSection 1 at 19-May-2010 00:27:57 CDT ... *------- PYTHIA Event and Cross Section Statistics -------------------------------------------------------------* | | | Subprocess Code | Number of events | sigma +- delta | | | Tried Selected Accepted | (estimated) (mb) | | | | | |-----------------------------------------------------------------------------------------------------------------| | | | | | g g -> g g 111 | 577 64 64 | 2.956e-03 1.611e-04 | | g g -> q qbar (uds) 112 | 3 1 1 | 9.544e-05 9.544e-05 | | q g -> q g 113 | 597 71 71 | 3.034e-03 2.016e-04 | | q q(bar)' -> q q(bar)' 114 | 89 13 13 | 4.280e-04 7.041e-05 | | q qbar -> g g 115 | 1 0 0 | 0.000e+00 0.000e+00 | | q qbar -> q' qbar' (uds) 116 | 0 0 0 | 0.000e+00 0.000e+00 | | g g -> c cbar 121 | 0 0 0 | 0.000e+00 0.000e+00 | | q qbar -> c cbar 122 | 0 0 0 | 0.000e+00 0.000e+00 | | g g -> b bbar 123 | 3 1 1 | 1.671e-05 1.671e-05 | | q qbar -> b bbar 124 | 0 0 0 | 0.000e+00 0.000e+00 | | | | | | sum | 1270 150 150 | 6.530e-03 2.846e-04 | | | *------- End PYTHIA Event and Cross Section Statistics ----------------------------------------------------------*
and on
and the corresponding individual jet pT
and sum pT (linear
/log
) distributions.
Phase space p;T,min = 20 GeV:
*------- PYTHIA Process Initialization --------------------------* | | | We collide p+ with p+ at a CM energy of 7.000e+03 GeV | | | |------------------------------------------------------------------| | | | | Subprocess Code | Estimated | | | max (mb) | | | | |------------------------------------------------------------------| | | | | g g -> g g 111 | 1.369e+00 | | g g -> q qbar (uds) 112 | 1.461e-02 | | q g -> q g 113 | 8.726e-01 | | q q(bar)' -> q q(bar)' 114 | 9.340e-02 | | q qbar -> g g 115 | 6.842e-04 | | q qbar -> q' qbar' (uds) 116 | 3.085e-04 | | g g -> c cbar 121 | 4.812e-03 | | q qbar -> c cbar 122 | 1.020e-04 | | g g -> b bbar 123 | 4.322e-03 | | q qbar -> b bbar 124 | 9.671e-05 | | | | *------- End PYTHIA Process Initialization -----------------------* *------- PYTHIA Multiple Interactions Initialization ------------* | | | sigmaNonDiffractive = 48.45 mb | | | | pT0 = 3.12 gives sigmaInteraction = 152.06 mb: accepted | | | *------- End PYTHIA Multiple Interactions Initialization --------* PYTHIA Warning in MultipleInteractions::init: maximum increased by factor 1.539 *------- PYTHIA Flag + Mode + Parm + Word Settings (changes only) ----------------------------------------------* | | | Name | Now | Default Min Max | | | | | | Beams:allowVertexSpread | on | off | | HardQCD:all | on | off | | Main:timesAllowErrors | 10000 | 10 0 | | ParticleDecays:limitTau0 | on | off | | PhaseSpace:pTHatMin | 20.00000 | 0.0 0.0 | | SecondHard:generate | on | off | | SecondHard:TwoJets | on | off | | | *------- End PYTHIA Flag + Mode + Parm + Word Settings ---------------------------------------------------------* Begin processing the 1st record. Run 1, Event 1, LumiSection 1 at 18-May-2010 19:25:05 CDT ... *------- PYTHIA Event and Cross Section Statistics --------------------------------------------------------* | | | Subprocess Code | Number of events | sigma +- delta | | | Tried Selected Accepted | (estimated) (mb) | | | | | |------------------------------------------------------------------------------------------------------------| | | | | | First hard process: | | | | | | | | g g -> g g 111 | 88 16 16 | 1.339e-03 3.422e-04 | | g g -> q qbar (uds) 112 | 0 0 0 | 0.000e+00 0.000e+00 | | q g -> q g 113 | 71 7 6 | 5.480e-04 1.862e-04 | | q q(bar)' -> q q(bar)' 114 | 11 4 4 | 1.323e-04 5.239e-05 | | q qbar -> g g 115 | 0 0 0 | 0.000e+00 0.000e+00 | | q qbar -> q' qbar' (uds) 116 | 0 0 0 | 0.000e+00 0.000e+00 | | g g -> c cbar 121 | 0 0 0 | 0.000e+00 0.000e+00 | | q qbar -> c cbar 122 | 0 0 0 | 0.000e+00 0.000e+00 | | g g -> b bbar 123 | 0 0 0 | 0.000e+00 0.000e+00 | | q qbar -> b bbar 124 | 0 0 0 | 0.000e+00 0.000e+00 | | | | | | sum | 170 27 26 | 2.019e-03 4.952e-04 | | | | | |------------------------------------------------------------------------------------------------------------| | | | | | Second hard process: | | | | | | | | g g -> g g 111 | 74 15 14 | 1.224e-03 3.345e-04 | | g g -> q qbar (uds) 112 | 0 0 0 | 0.000e+00 0.000e+00 | | q g -> q g 113 | 54 10 10 | 6.589e-04 1.939e-04 | | q q(bar)' -> q q(bar)' 114 | 5 1 1 | 1.247e-04 1.276e-04 | | q qbar -> g g 115 | 0 0 0 | 0.000e+00 0.000e+00 | | q qbar -> q' qbar' (uds) 116 | 0 0 0 | 0.000e+00 0.000e+00 | | g g -> c cbar 121 | 1 1 1 | 1.527e-05 1.562e-05 | | q qbar -> c cbar 122 | 0 0 0 | 0.000e+00 0.000e+00 | | g g -> b bbar 123 | 0 0 0 | 0.000e+00 0.000e+00 | | q qbar -> b bbar 124 | 0 0 0 | 0.000e+00 0.000e+00 | | | | | | sum | 134 27 26 | 2.023e-03 5.147e-04 | | | | | |------------------------------------------------------------------------------------------------------------| | | | Uncombined cross sections for the two event sets were 3.340e-01 and 3.448e-01 mb, respectively, combined | | using a sigma(nonDiffractive) of 4.845e+01 mb and an impact-parameter enhancement factor of 1.776e+00. | | | *------- End PYTHIA Event and Cross Section Statistics -----------------------------------------------------*
*------- PYTHIA Process Initialization --------------------------* | | | We collide p+ with p+ at a CM energy of 7.000e+03 GeV | | | |------------------------------------------------------------------| | | | | Subprocess Code | Estimated | | | max (mb) | | | | |------------------------------------------------------------------| | | | | g g -> g g 111 | 1.369e+00 | | g g -> q qbar (uds) 112 | 1.461e-02 | | q g -> q g 113 | 8.726e-01 | | q q(bar)' -> q q(bar)' 114 | 9.340e-02 | | q qbar -> g g 115 | 6.842e-04 | | q qbar -> q' qbar' (uds) 116 | 3.085e-04 | | g g -> c cbar 121 | 4.812e-03 | | q qbar -> c cbar 122 | 1.020e-04 | | g g -> b bbar 123 | 4.322e-03 | | q qbar -> b bbar 124 | 9.671e-05 | | | *------- End PYTHIA Process Initialization -----------------------* *------- PYTHIA Multiple Interactions Initialization ------------* | | | sigmaNonDiffractive = 48.45 mb | | | | pT0 = 3.12 gives sigmaInteraction = 151.76 mb: accepted | | | *------- End PYTHIA Multiple Interactions Initialization --------* PYTHIA Warning in MultipleInteractions::init: maximum increased by factor 1.541 *------- PYTHIA Flag + Mode + Parm + Word Settings (changes only) ----------------------------------------------* | | | Name | Now | Default Min Max | | | | | | Beams:allowVertexSpread | on | off | | HardQCD:all | on | off | | Main:timesAllowErrors | 10000 | 10 0 | | ParticleDecays:limitTau0 | on | off | | PhaseSpace:pTHatMin | 20.00000 | 0.0 0.0 | | | *------- End PYTHIA Flag + Mode + Parm + Word Settings ---------------------------------------------------------* Begin processing the 1st record. Run 1, Event 1, LumiSection 1 at 18-May-2010 19:29:02 CDT ... *------- PYTHIA Event and Cross Section Statistics -------------------------------------------------------------* | | | Subprocess Code | Number of events | sigma +- delta | | | Tried Selected Accepted | (estimated) (mb) | | | | | |-----------------------------------------------------------------------------------------------------------------| | | | | | g g -> g g 111 | 669 85 85 | 1.521e-01 8.924e-03 | | g g -> q qbar (uds) 112 | 3 1 1 | 3.461e-03 3.461e-03 | | q g -> q g 113 | 419 58 58 | 1.054e-01 8.361e-03 | | q q(bar)' -> q q(bar)' 114 | 43 6 6 | 7.901e-03 1.910e-03 | | q qbar -> g g 115 | 0 0 0 | 0.000e+00 0.000e+00 | | q qbar -> q' qbar' (uds) 116 | 0 0 0 | 0.000e+00 0.000e+00 | | g g -> c cbar 121 | 1 0 0 | 0.000e+00 0.000e+00 | | q qbar -> c cbar 122 | 0 0 0 | 0.000e+00 0.000e+00 | | g g -> b bbar 123 | 1 0 0 | 0.000e+00 0.000e+00 | | q qbar -> b bbar 124 | 0 0 0 | 0.000e+00 0.000e+00 | | | | | | sum | 1136 150 150 | 2.689e-01 1.285e-02 | | | *------- End PYTHIA Event and Cross Section Statistics ----------------------------------------------------------*
and on
and the corresponding individual jet pT
and sum pT (linear
/log
) distributions.
-- NateOdell - 29-Apr-2010 
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