Compact Muon Solenoid
LHC, CERN
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| CMS-PAS-SMP-14-007 | ||
| W-like measurement of the Z boson mass using dimuon events collected in pp collisions at $\sqrt{s} =$ 7 TeV | ||
| CMS Collaboration | ||
| March 2016 | ||
| Abstract: The mass of the Z boson is measured using a sample of $ \mathrm{Z} \rightarrow \mu \mu$ events, where one of the two muons is removed from the event to form the $ \mathrm{W}^\mathrm{like} $ candidate. This procedure provides a proof of principle and a quantitative validation of analysis techniques developed for a high-precision measurement of the W boson mass in $ \mathrm{W} \rightarrow \mu \nu $ events. The study is made on the basis of a dimuon data sample collected by CMS at $\sqrt{s} =$ 7 TeV, corresponding to an integrated luminosity of 4.7 fb$^{-1}$. A set of $ 2 \times 10^5 $ $ \mathrm{Z} \rightarrow \mu \mu $ candidates is used to extract the result. The Z mass is extracted through the $ \mathrm{W}^\mathrm{like} $ lepton $ p_\mathrm{T} $, transverse mass and transverse missing energy distributions, and is compatible with the world-average value, $ M_\mathrm{Z}^\mathrm{PDG} = $ 91187.6 $\pm$ 2.1 MeV. The lowest uncertainty is obtained when using the $\mathrm{W}^\mathrm{like+}$ transverse mass, for which $ M_\mathrm{Z}^\mathrm{W_{like}} = $ 91206 $\pm$ 36 (stat) $\pm$ 30 (syst) MeV. | ||
| Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; | ||
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Compact Muon Solenoid LHC, CERN |
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