2015:groups:tools:vbb

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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] (current) christian.reuschle [Ongoing work and planned contributions:] |
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=== 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 shower) and 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.1456332284.txt.gz · Last modified: 2016/02/24 17:44 by vitaliano.ciulli

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