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2015:groups:tools:vbb [2016/02/24 17:44]
vitaliano.ciulli [github instructions]
2015:groups:tools:vbb [2016/03/17 19:19]
christian.reuschle [Ongoing work and planned contributions:]
Line 135: Line 135:
 === Herwig (Graeme, Christian) === === Herwig (Graeme, Christian) ===
  
-  ​Z+bb +Preliminary results for Zbb production in the 5FS can be found on http://​www.hep.man.ac.uk/​u/​graeme/​public/​LH_Vbb/​preliminary/​Zbb/​ 
-  * W+bb(?+  ​Shown are the four matching-shower combinations of Herwig7, i.e. 
 +    - NLO$\oplus$QTilde aka MCatNLO-based matching with the angular-ordered shower, 
 +    - NLO$\oplus$Dipole aka MCatNLO-based matching with the dipole shower, 
 +    - NLO$\otimes$QTilde aka Powheg-based matching with the angular-ordered shower, 
 +    - NLO$\otimes$Dipole aka Powheg-based matching with the dipole shower. 
 +  * The uncertainty bands are purely from scale variations with respect to all scales in the hard sub-processes and in the shower, i.e. muR, muF (and the corresponding scales of $\alpha_s$ and PDF arguments in the showerand muQ (shower start scale). 
 +  * The central scale choice is a fixed scale (Z mass) at the moment for muR=muF=muQ. 
 +  * The PDF sets being used are the default PDF sets to which the showers are tuned, i.e. MMHT2014lo68cl and MMHT2014nlo68cl. 
 +  * The underlying hard process is $p p \to e^+ e^- b \bar{b}$, with $b,​\bar{b}\in p$ and we cut on the final state b quarks by requiring at least two jets, with a min. pT of 18 GeV and 15 GeV for the first and second jet respectively.  
 +  * Statistics: 40k, unweighted.
  
 +
 +Preliminary results for Zb production in the 5FS can be found on http://​www.hep.man.ac.uk/​u/​graeme/​public/​LH_Vbb/​preliminary/​Zb/​
 +  * Description:​ see the first four main bullet points above.
 +  * The underlying hard process is $p p \to e^+ e^- {b,​\bar{b}}$,​ with $b,​\bar{b}\in p$ and we cut on the final state b quark by requiring at least one jet, with a min. pT of 18 GeV for the first jet.
 +  * We cut on the invariant mass of the charged-lepton pair, with a min. inv. mass of 60 GeV and a max. inv. mass of 120 GeV.
 +  * Statistics: 100k, unweighted.
 +
 +
 +Preliminary results for Zbb production in the 4FS can be found on http://​www.hep.fsu.edu/​~creuschle/​public/​.Plots_2016_LHVbb_Preliminary/​plots_Zbb_4FS_MMHTnf5_BnotinJ_0Jet_NoBCut_WeightedOff_FixedScale/​
 +  * Shown is NLO$\oplus$QTilde (MCatNLO-DefaultShower) and NLO$\otimes$QTilde (Powheg-DefaultShower).
 +  * Scale choices, scale variations and choice of PDF sets as described above.
 +  * The underlying hard process is $p p \to e^+ e^- b \bar{b}$, with $b,​\bar{b}\notin p$. There are no cuts on the b quarks.
 +  * We cut on the invariant mass of the charged-lepton pair, with a min. inv. mass of 60 GeV and a max. inv. mass of 120 GeV.
 +  * We cut slightly on the charged leptons, with a min. pT of 5 GeV and a rapidity range between -4 and 4.
 +  * Statistics: 100k, unweighted.
 +
 +
 +Preliminary results for Wbb production in the 4FS can be found on http://​www.hep.fsu.edu/​~creuschle/​public/​.Plots_2016_LHVbb_Preliminary/​plots_Wbb_4FS_MMHTnf5_BnotinJ_0Jet_NoBCut_WeightedOff_FixedScale/​
 +  * Shown is NLO$\oplus$QTilde (MCatNLO-DefaultShower) and NLO$\otimes$QTilde (Powheg-DefaultShower).
 +  * The central scale choice is a fixed scale (W mass) at the moment for muR=muF=muQ.
 +  * Scale variations and choice of PDF sets as described above.
 +  * The underlying hard process is $p p \to l \nu b \bar{b}$, considering $e^{\pm},​\mu^{\pm}\in l$. There are no cuts on the b quarks.
 +  * We cut on the transverse mass of the W, with a min. trans. mass of 20 GeV.
 +  * We cut slightly on the charged lepton, with a min. pT of 5 GeV and a rapidity range between -4 and 4.
 +  * Statistics: 100k, unweighted.
 +
 +
 +Further studies on Zbb production in the 4FS, for a different PDF choice, can be found on https://​www.itp.kit.edu/​~reuschle/​.Plots_2016_LHVbb_Preliminary/​Zbb4FS/​plots_NNPDFnf4_BnotinJ_0Jet_MCatNLO-DefaultShower_WeightedOn_Central/​
 +  * Shown is the NLO$\oplus$QTilde aka MCatNLO-based matching with the angular ordered shower.
 +  * No scale variations.
 +  * The central scale choice is a fixed scale (Z mass) at the moment for muR=muF=muQ.
 +  * The PDF set being used is NNPDF30_nlo_as_0118_nf_4.
 +  * Statistics: 1M, weighted.
 +
 +
 +Further studies on Wbb production in the 4FS, for varying PDF choices, can be found on https://​www.itp.kit.edu/​~reuschle/​.Plots_2016_LHVbb_Preliminary/​Wbb4FS/​plots_AllPDFs_BinJ_1Jet_MCatNLO-DefaultShower_WeightedOff_Central/​ or similarly for on https://​www.itp.kit.edu/​~reuschle/​.Plots_2016_LHVbb_Preliminary/​Wbb4FS/​plots_AllPDFs_BnotinJ_0Jet_MCatNLO-DefaultShower_WeightedOff_Central/​
 +  * The difference between the two is that for one we require one jet (which may contain a b quark) with a certain min pT (first link), for the other we don't cut on the b quarks at all (second link).
 +  * Shown is the NLO$\oplus$QTilde aka MCatNLO-based matching with the angular ordered shower.
 +  * No scale variations.
 +  * The central scale choice is a fixed scale (W mass) at the moment for muR=muF=muQ.
 +  * There is a choice of different PDF sets being used, i.e.
 +    - MMHTnf5: MMHT2014lo68cl and MMHT2014nlo68cl,​
 +    - MMHTnf4: MMHT2014nlo68cl_nf4,​
 +    - NNPDFnf5: NNPDF30_lo_as_0118 and NNPDF30_nlo_as_0118,​
 +    - NNPDFnf4: NNPDF30_lo_as_0118_nf_4 and NNPDF30_nlo_as_0118_nf_4.
 +  * Statistics: 100k, unweighted.
 +
 +
 +The remaining parts of the description of the run setups can be found in the vbb.pdf file in the draft for the proceedings.
 ==== github instructions ==== ==== github instructions ====
  
2015/groups/tools/vbb.txt · Last modified: 2016/03/17 19:19 by christian.reuschle