Compact Muon Solenoid
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| CMS-PAS-SMP-24-012 | ||
| Measurement of the jet mass and W boson mass in hadronic decays of boosted W bosons at 13 TeV | ||
| CMS Collaboration | ||
| 2025-07-08 | ||
| Abstract: The jet mass of W bosons decaying to a quark-antiquark pair is measured in W+jets events from proton-proton collisions at a center-of-mass energy of $ \sqrt{s}= $ 13 TeV. The data used were collected by the CMS experiment at the CERN LHC and correspond to an integrated luminosity of 138 fb$ ^{-1} $. Hadronic decays of W bosons with high momenta produce strongly collimated decay products due to the large Lorentz boost, and are reconstructed as single large-radius jets. These jets have a characteristic substructure that is exploited to distinguish them from the large background of quark- and gluon-initiated jets. The jet mass is computed using the soft drop algorithm, which suppresses soft wide-angle radiation that leads to a broadening of the jet mass distribution. Unfolded measurements are presented of the double-differential cross section as a function of the jet transverse momentum and soft-drop mass. From these distributions, the first measurement of the W boson mass in an all-jets final state at a hadron collider is obtained, with a value of 80.77 $ \pm $ 0.57 GeV. | ||
| Links: CDS record (PDF) ; CADI line (restricted) ; | ||
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Compact Muon Solenoid LHC, CERN |
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