2015:groups:sm:qg
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2015:groups:sm:qg [2015/06/04 14:26] jesse.thaler [Quark/Gluon Enrichment Studies] |
2015:groups:sm:qg [2015/06/04 16:40] jesse.thaler [Key Question] |
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| a.k.a. Hunting the White Whale of Jet Substructure | a.k.a. Hunting the White Whale of Jet Substructure | ||
| + | * Andy Buckley | ||
| * Jon Butterworth | * Jon Butterworth | ||
| + | * Mario Campanelli | ||
| * Marat Freytsis | * Marat Freytsis | ||
| * Peter Loch <loch@physics.arizona.edu> | * Peter Loch <loch@physics.arizona.edu> | ||
| * Deepak Kar | * Deepak Kar | ||
| * Andrzej Siodmok | * Andrzej Siodmok | ||
| - | * Peter Skands | + | * Peter Skands <peter.skands@monash.edu> |
| * Dave Soper | * Dave Soper | ||
| * Gregory Soyez | * Gregory Soyez | ||
| + | * Frank Tackmann | ||
| * Jesse Thaler <jthaler@mit.edu> | * Jesse Thaler <jthaler@mit.edu> | ||
| - | * who did I forget? | + | * ... |
| - | + | ||
| - | * Remotely: Andy Buckley, Mario Campanelli | + | |
| Link to GitHub repository: https://github.com/gsoyez/lh2015-qg | Link to GitHub repository: https://github.com/gsoyez/lh2015-qg | ||
| Line 93: | Line 94: | ||
| * Do we understand FSR modeling by workhorse parton showers? | * Do we understand FSR modeling by workhorse parton showers? | ||
| + | * Start with the clean case of e+e-, move to pp later. | ||
| ==== Basic Plan === | ==== Basic Plan === | ||
| Line 136: | Line 138: | ||
| * Above study at hadron colliders, using dijets, W/Z/gamma + j, and maybe t tbar samples | * Above study at hadron colliders, using dijets, W/Z/gamma + j, and maybe t tbar samples | ||
| - | ===== Original Notes from Gregory ===== | + | ===== Preliminary plots for meeting on Thursday ===== |
| + | |||
| + | {{:2015:groups:sm:ga_10_20.pdf|}} | ||
| + | {{:2015:groups:sm:ga_10_10.pdf|}} | ||
| + | {{:2015:groups:sm:ga_10_05.pdf|}} | ||
| + | {{:2015:groups:sm:ga_00_00.pdf|}} | ||
| + | {{:2015:groups:sm:ga_20_00.pdf|}} | ||
| + | |||
| + | ===== Notes from Tuesday Meeting ===== | ||
| <code> | <code> | ||
| Line 266: | Line 276: | ||
| above, +PU, VBF | above, +PU, VBF | ||
| [Peter L.] | [Peter L.] | ||
| + | |||
| + | </code> | ||
| + | |||
| + | ===== Notes from Thursday Meeting ===== | ||
| + | |||
| + | <code> | ||
| + | |||
| + | |||
| + | Meeting in Les-Houches | ||
| + | |||
| + | |||
| + | Presentation of the wiki notes: list of contributors, ... | ||
| + | |||
| + | Presentation of the status of the software: | ||
| + | start w e+e- and do pp later | ||
| + | Rivet analysis in place which computes from a HepMC event sample the various generalised angularity distributions | ||
| + | |||
| + | Reminder: what we mean by a q and a g is e+e-\to qq and e+e-\to gg | ||
| + | If we want to do something more refined: | ||
| + | - at LO we can unambiguously sum flavours in hemispheres defined by thrust | ||
| + | - at NLO we can unambiguously sum flavours in hemispheres defined by thrust | ||
| + | we get a quark and a small gluon fraction | ||
| + | - at NNLO things are more complicated. We can use a flavoured | ||
| + | algorithm (BSZ) to define the flavour of each hemisphere | ||
| + | - for pp collisions, we should use a flavoured algorithm to | ||
| + | determine flavour, and then find a way (e.g. using ghosts) to | ||
| + | run anti-kt jets. This would deserve a topic per se (a LH accord)? | ||
| + | |||
| + | - Question: can we match to the Born and find an operatiroal | ||
| + | definition up t power corrections? | ||
| + | Use case: VBF, two jets with a third jet veto. q/g well-defined | ||
| + | in the exclusive limit | ||
| + | |||
| + | Questions to look into: | ||
| + | - is the discrimination power (e.g. for width) coming from the hadronisation regime? | ||
| + | - plotting in log binninb? | ||
| + | - pythia v. herwig important to test string v. cluster hadronisation | ||
| + | - isolate hadronisation regime. Study the scaling in different bins | ||
| + | of one angularity (e.g. thrust). Take a hadronisation region | ||
| + | (T\propto LQCD/Q) and a shower region (T~0.1-0.2) plus optionally a | ||
| + | "hard jet region" (T >~ 0.25) | ||
| + | - does mathing help? | ||
| + | - jet radius dependence (edit analysis and recompile) | ||
| + | - analytic predictions? | ||
| + | for thrust: ee->qq known at N^3LL' + N^3LO | ||
| + | ee->qq known at N^2LL' + N^2LO | ||
| + | ang(bkappa=1): NLL' | ||
| + | - question of the universality/process dependence of the conclusions? | ||
| + | Related to whether the power comes from the core or the periphery? | ||
| + | |||
| + | - process to consider: | ||
| + | mu+mu- -> spin1 -> qq take photons | ||
| + | mu+mu- -> spin0 -> gg take Higgs | ||
| + | for tests of universality | ||
| + | mu+mu- -> spin0 -> qq | ||
| + | |||
| + | - Energies Q=sqrt = 50, 200, 800 GeV | ||
| + | jetdef: ee-antikt [genkt, p=-1], WTA_modp recomb scheme | ||
| + | radii: 0.3, 0.6, 0.9 | ||
| + | |||
| + | - add thrust from thrust hemispheres for analytic purpose | ||
| + | |||
| + | - add multiplicity (event-wide) in bins of thrust: | ||
| + | T < 5 GeV/sqrt(S) | ||
| + | 5 GeV/sqrt(S) < T < 0.1 | ||
| + | 0.1 < T < 0.2 | ||
| + | 0.2 < T | ||
| + | |||
| </code> | </code> | ||
2015/groups/sm/qg.txt · Last modified: 2015/07/14 08:27 by philippe.gras
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