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2015:groups:sm:qg [2015/06/04 17:02] jesse.thaler |
2015:groups:sm:qg [2015/06/04 17:11] jesse.thaler [Questions] |
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* Question: use ROC curves or mutual information (I(T;A)) to quantify discrimination power? | * Question: use ROC curves or mutual information (I(T;A)) to quantify discrimination power? | ||
* Answer: doesn't really matter, probably I(T;A) is easier to begin with. | * Answer: doesn't really matter, probably I(T;A) is easier to begin with. | ||
+ | * Better answer: Use separation (S-B)^2 / (2 (S + B)). | ||
==== Core Jet Shapes ==== | ==== Core Jet Shapes ==== | ||
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* Question: Sum over particles (angularity-style) vs. sum over pairs (ECF-style) | * Question: Sum over particles (angularity-style) vs. sum over pairs (ECF-style) | ||
* Answer: Sum over particles (angularity-style) | * Answer: Sum over particles (angularity-style) | ||
+ | * Question: Plot linear or log scale? | ||
+ | * Answer: Do both if it makes sense, better for angularities to have log scale. | ||
==== Supplemental Jet Shapes ==== | ==== Supplemental Jet Shapes ==== | ||
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* Rivet analysis in place which computes from a HepMC event sample the various generalised angularity distributions. | * Rivet analysis in place which computes from a HepMC event sample the various generalised angularity distributions. | ||
+ | ==== Questions ==== | ||
+ | * Is discrimination power (e.g. for width) coming from the hadronization regime? | ||
+ | * Possibility: Isolate hadronization regime (thrust ~ LambdaQCD/Q) and shower regime (thrust ~ 0.1-0.2) and optionally hard jet regime (thrust >~ 0.25). Study scaling of, e.g., multiplicity as a function of Q in each of these regimes. | ||
+ | * By testing pythia vs. herwig, can we test string vs. cluster hadronization? | ||
+ | * Is there jet radius dependence? | ||
+ | * Does matching help in controlling quark/gluon uncertainties? | ||
+ | * Universality/process dependence of conclusions? | ||
+ | * Related to whether the discrimination power comes from the core or the periphery of jet. | ||
===== Next Les Houches Study (for after LH) ===== | ===== Next Les Houches Study (for after LH) ===== | ||