2015:groups:sm:qg
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2015:groups:sm:qg [2015/06/04 16:40] jesse.thaler [Key Question] |
2015:groups:sm:qg [2015/06/04 16:51] jesse.thaler [What is the killer app of quark/gluon enrichment?] |
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| * Enhancing W/Z/t/H in moderately boosted regime (where we can quark-tag the subjets. | * Enhancing W/Z/t/H in moderately boosted regime (where we can quark-tag the subjets. | ||
| + | ==== Hemisphere quark/gluon definitions in e+e- ==== | ||
| + | |||
| + | * Consider the case of e+ e- -> q qbar. Partition event into (thrust) hemisphere, define hemisphere flavor by summing over flavors of hemisphere constituents. | ||
| + | * At LO, we can unambiguously define hemisphere flavors. | ||
| + | * At NLO, we can also unambiguously define flavor via hemisphere, though there is now a small gluon fraction from gluon recoiling against q qbar pair. | ||
| + | * At NNLO, things are more complicated. | ||
| + | * Can have soft gluon splitting into q-qbar in different hemispheres, creates IRC safety issue. | ||
| + | * One can use a flavored algorithm (BSZ) to define the flavour of two flavor-kt jets | ||
| + | * Ultimately, want to define flavor by the Born-level operator contributing to the process. All subtleties are formally power suppressed. | ||
| + | |||
| + | ==== Flavored Jet Algorithms ==== | ||
| + | |||
| + | * This is a topic worthy of its own study. | ||
| + | * For pp collisions, multiple possible uses of flavored jet algorithms. | ||
| + | * One can just run flavor-kT | ||
| + | * Or one can run flavor-kT to define flavor ghosts, and run standard anti-kT. | ||
| ===== Physics Issues ===== | ===== Physics Issues ===== | ||
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| * Generalized angularities with soft-drop jets, varying beta_SD | * Generalized angularities with soft-drop jets, varying beta_SD | ||
| * Do sum over pairs version of angularities (i.e. ECF-style) | * Do sum over pairs version of angularities (i.e. ECF-style) | ||
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| + | ==== Analysis Workflow ==== | ||
| + | |||
| + | * Rivet analysis in place which computes from a HepMC event sample the various generalised angularity distributions. | ||
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| ===== Next Les Houches Study (for after LH) ===== | ===== Next Les Houches Study (for after LH) ===== | ||
2015/groups/sm/qg.txt ยท Last modified: 2015/07/14 08:27 by philippe.gras
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