Reco level Smin and subsystem Smin: improved global inclusive variables for measuring the new physics mass scale in MET events at hadron colliders

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The variable {radical}s{sub min} was originally proposed in [1] as a model-independent, global and fully inclusive measure of the new physics mass scale in missing energy events at hadron colliders. In the original incarnation of {radical}s{sub min}, however, the connection to the new physics mass scale was blurred by the effects of the underlying event, most notably initial state radiation and multiple parton interactions. In this paper we advertize two improved variants of the {radical}s{sub min} variable, which overcome this problem. First we show that by evaluating the {radical}s{sub min} variable at the RECO level, in terms of the reconstructed ... continued below

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42 pages

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Konar, Partha; U., /Florida; Kong, Kyoungchul; /SLAC; Matchev, Konstantin T.; Park, Myeonghun et al. August 11, 2011.

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The variable {radical}s{sub min} was originally proposed in [1] as a model-independent, global and fully inclusive measure of the new physics mass scale in missing energy events at hadron colliders. In the original incarnation of {radical}s{sub min}, however, the connection to the new physics mass scale was blurred by the effects of the underlying event, most notably initial state radiation and multiple parton interactions. In this paper we advertize two improved variants of the {radical}s{sub min} variable, which overcome this problem. First we show that by evaluating the {radical}s{sub min} variable at the RECO level, in terms of the reconstructed objects in the event, the effects from the underlying event are significantly diminished and the nice correlation between the peak in the {radical}s{sub min}{sup (reco)} distribution and the new physics mass scale is restored. Secondly, the underlying event problem can be avoided altogether when the {radical}s{sub min} concept is applied to a subsystem of the event which does not involve any QCD jets. We supply an analytic formula for the resulting subsystem {radical}s{sub min}{sup (sub)} variable and show that its peak exhibits the usual correlation with the mass scale of the particles produced in the subsystem. Finally, we contrast {radical}s{sub min} to other popular inclusive variables such as H{sub T}, M{sub Tgen} and M{sub TTgen}. We illustrate our discussion with several examples from supersymmetry, and with dilepton events from top quark pair production.

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42 pages

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  • Journal Name: JHEP 1106:041,2011; Journal Volume: 2011; Journal Issue: 6

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  • Report No.: SLAC-PUB-14136
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 1024172
  • Archival Resource Key: ark:/67531/metadc834336

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  • August 11, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 1, 2016, 1:37 p.m.

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Konar, Partha; U., /Florida; Kong, Kyoungchul; /SLAC; Matchev, Konstantin T.; Park, Myeonghun et al. Reco level Smin and subsystem Smin: improved global inclusive variables for measuring the new physics mass scale in MET events at hadron colliders, article, August 11, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc834336/: accessed August 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.