TOP-11-027
Mass determination in the ttbar system with kinematic endpoints

Abstract

We report on a simultaneous measurement of the top quark, W boson, and neutrino masses in $t\bar{t}$ dilepton decays with 4.98/fb of data from the CMS experiment. The analysis is based on endpoint determinations in kinematic distributions. In addition to the unconstrained fit for three masses, the neutrino and W boson masses can be constrained to standard values; in the maximally constrained fit, the top mass is found to be $M_t=173.9\pm 0.9$(stat) $^{+1.2}_{-1.8}$(syst) GeV.

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Tables

Table1.png

Table4.png

Figures

Figure Caption
1.png Figure 1: Top dilepton decays, with two jets, two leptons, and two unmeasured momenta, exhibit a signature similar to some SUSY modes.
2.png Figure 2: A ttbar dileptonic decay with the two subsystems for computing MT2-210 and MT2-221 indicated. The ``upstream'', ``visible", and ``child'' objects are enclosed in dashed rectangles.
3a.png Figure 3a : MT2-210 distribution
3b.png Figure 3b : MT2-221 distribution
3c.png Figure 3c : Mbl distribution.
4a.png Figure 4a: Composition of MC event samples.
4b.png Figure 4b: Composition of MC event samples.
5.png Figure 5: Background pdf shapes
6.png Figure 6: Distribution of top mass in doubly-constrained fits of 200 pseudo-experiments bootstrapped from the 4.98/fb dataset.
7a.png Figure 7 (left): MC pull distribution.
7b.png Figure 7 (right): Fitting top mass in samples produced with various top mass inputs.
8a.png Figure 8 (left): Unconstrained fit.
8b.png Figure 8 (middle): Singly-constrained fit.
8c.png Figure 8 (right): Doubly-constrained fit.

-- JimAlexander - 15-Sep-2012

Topic attachments
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PDFpdf 1.pdf r1 manage 115.0 K 2012-09-15 - 04:36 JimAlexander  
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PDFpdf 7a.pdf r1 manage 16.5 K 2012-09-15 - 04:36 JimAlexander  
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PDFpdf 7b.pdf r1 manage 15.8 K 2012-09-15 - 04:37 JimAlexander  
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PDFpdf 8a.pdf r1 manage 58.0 K 2012-09-15 - 04:37 JimAlexander  
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PDFpdf 8b.pdf r1 manage 58.3 K 2012-09-15 - 04:37 JimAlexander  
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PDFpdf 8c.pdf r1 manage 58.3 K 2012-09-15 - 04:37 JimAlexander  
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PNGpng Table1.png r1 manage 43.3 K 2012-09-15 - 05:46 JimAlexander  
PNGpng Table4.png r2 r1 manage 41.0 K 2012-09-15 - 05:44 JimAlexander  
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Topic revision: r2 - 2012-09-15 - RobertoChierici
 
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