Compact Muon Solenoid
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| CMS-PAS-SMP-21-013 | ||
| Observation of WW from double-parton scattering in proton-proton collisions at $\sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| March 2022 | ||
| Abstract: The first observation of WW production from double-parton scattering processes using same-charge electron-muon and dimuon events in proton-proton collisions is reported. The data sample corresponds to an integrated luminosity of 138 fb$^{-1}$ recorded at a center-of-mass energy of 13 TeV using the CMS detector at the CERN LHC during 2016-2018. Multivariate classifiers are used to distinguish the signal process from the main backgrounds. A maximum likelihood fit is performed to extract the signal cross section. The observed significance of the signal is 6.2 standard deviations, where a significance of 6.7 standard deviations is expected based on the model of mutli-parton interactions as implemented in PYTHIA. Cross section measurements for leptocially decaying W bosons in an charge-inclusive phase space and in a $\mathrm{W}^{\pm}\mathrm{W}^{\pm}$ fiducial region are reported. The measured inclusive cross section is 0.16 $\pm$ 0.02 (stat) $\pm$ 0.02 (syst) $\pm$ 0.02 (model) pb, while the measured fiducial cross section is 6.27 $\pm$ 0.69 (stat) $\pm$ 0.78 (syst) fb. Sensitivity towards parton correlations is probed using the pseudorapidity-based lepton asymmetry variable. | ||
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Links:
CDS record (PDF) ;
Physics Briefing ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, PRL 131 (2023) 091803. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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