Mass methods

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Variable/Method Reference(s)/Code Realm of Applicability Precision Good for Fails for Unknown/Future directions
MT (ancient) one missing particle
Meff always does not identify process in any way
HT always does not identify process in any way
Edges (lots) Intermediate 3-body decays? Combinatoric (other side) jets not considered. Calorimeter nonlinearity?
MT2 hep-ph/9906349
MT2 kink ("stransverse" mass) arXiv:0709.0288 4-body final state, 2 missing large mass differences and large pT small mass differences or no pT
MTn 4-body final state, n missing
MTgen arXiv:0708.1028
M2C arXiv:0712.0943
M3C arXiv:0811.2138
\sqrt{s}_{min} arXiv:0812.1042
Exactly-constrained Polynomials arXiv:0707.0030 4 on-shell intermediate resonances, 2 missing Apply to squark-neutralino2-slepton-neutralino1 cascade where other side is squark-neutralino1.
Multi-event Polynomial intersection arXiv:0802.4290 5 or more on-shell intermediate resonances, 2 missing Statistics of histograms created with n-event subsets; If mass differences are fixed and the masses are increased, what happens? (Sabine Kraml); Develop methods for asymmetric chains and < 6 intermediate resonances.
  • How can we define "Precision" in a manner that lets us meaningfully compare different methods? A lot of process-specific assumptions and backgrounds usually enter the application of each method.
  • In general, all methods need to be systematically tested in cases where the assumptions needed for the method are not satisfied.
  • Appropriate consideration of ISR/FSR jets is not usually considered. Requires 2->3 matrix elements where the hard scattering process includes a possible extra hard quark/gluon radiation.
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