2013:groups:tools:matching
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2013:groups:tools:matching [2013/06/07 16:21] andy.buckley created |
2013:groups:tools:matching [2013/06/17 15:12] (current) klaus.rabbertz [Generators of interest] |
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| ==== Remaining freedom in $\mu_F$ and $\mu_R$ ==== | ==== Remaining freedom in $\mu_F$ and $\mu_R$ ==== | ||
| - | Argument that $\mu_R = k p_T^2$ (in argument of $\alpha_s$ for both ME and PS) should naturally have $k \sim 0.4$ from NLL $A_2$ term ~equivalence to scale modification (cf. Frank Krauss). This or $k = 1$ both viable. Explore both. | + | Argument that $\mu_R = k p_T$ (in argument of $\alpha_s$ for both ME and PS) should naturally have $k \sim 0.4$ from NLL $A_2$ term ~equivalence to scale modification (cf. Frank Krauss). This or $k = 1$ both viable. Explore both. |
| Effect of $\times 2$ variations on $\mu_R$: include both schemes, so use $k = \{ 0.2, 0.4, 1.0, 2.0 \}$ settings for comparison. | Effect of $\times 2$ variations on $\mu_R$: include both schemes, so use $k = \{ 0.2, 0.4, 1.0, 2.0 \}$ settings for comparison. | ||
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| ===== Comparison study ===== | ===== Comparison study ===== | ||
| - | Evaluate effect of different matching procedures for dijet events at NLO. Using Rivet ATLAS & CMS analyses of R32, inclusive/dijet spectra and jet rates (and ratios), jet shapes and pile-up/UE-robust jet mass etc. **Restrict to dijet process at NLO for now.** | + | Evaluate effect of different matching procedures for dijet events at NLO. Using Rivet ATLAS & CMS analyses of inclusive/dijet spectra, R32 and jet rates (and ratios), jet shapes and pile-up/UE-robust jet mass etc. **Restrict to dijet process at NLO for now.** |
| Include scale variations //and// scheme uncertainties separately. | Include scale variations //and// scheme uncertainties separately. | ||
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| * POWHEG-BOX + PYTHIA6? (1 scheme x 2 $\alpha_s(M_Z)$) | * POWHEG-BOX + PYTHIA6? (1 scheme x 2 $\alpha_s(M_Z)$) | ||
| * Sherpa MC@NLO | * Sherpa MC@NLO | ||
| + | * BlackHat + Sherpa ? | ||
| + | * Njet + Sherpa ? | ||
| * (a)MC@NLO+Herwig++? | * (a)MC@NLO+Herwig++? | ||
| * Herwig++ MatchBox? | * Herwig++ MatchBox? | ||
| * Pythia8 UNLOPS? | * Pythia8 UNLOPS? | ||
| + | * HEJ | ||
| * //More?// | * //More?// | ||
| + | |||
| + | Planning session blackboard: | ||
| + | |||
| + | {{planning_session.jpg}} | ||
| + | |||
| + | --- //[[klaus.rabbertz@cern.ch|Klaus Rabbertz]] 2013/06/17 15:12// | ||
| + | |||
| + | We have provided a step by step guide for generation of | ||
| + | fixed order events with NJet+Sherpa via the NJet website | ||
| + | [[https://bitbucket.org/njet/njet/wiki/NJetSherpa2_0_beta|Event Generation with NJet+Sherpa]] | ||
| + | Get in touch with Valery(yundin@nbi.dk) or myself if it needs any clarification/doesn't work etc. | ||
| + | |||
| + | --- //[[badger@nbi.dk|Simon Badger]] 2013/06/11 17:50// | ||
| + | ==== Other ==== | ||
| + | |||
| + | {{:2013:groups:tools:powheg-matching-schemes.pdf|Slides on POWHEG+Pythia8}} | ||
| + | {{:2013:nlo_matched_20130607.pdf|More slides on POWHEG+Pythia and Herwig etc}} | ||
| + | |||
| + | * systematic variation of underlying event simulation: eigentunes? other ideas? | ||
| + | * PDF uncertainties: how to do them properly in the shower? is this important? | ||
2013/groups/tools/matching.1370614898.txt.gz ยท Last modified: 2013/06/07 16:21 by andy.buckley
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