107 research outputs found

    Observation of the Rare Decay of the η Meson to Four Muons

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    A search for the rare η→Ό+Ό−Ό+Ό− double-Dalitz decay is performed using a sample of proton-proton collisions, collected by the CMS experiment at the CERN LHC with high-rate muon triggers during 2017 and 2018 and corresponding to an integrated luminosity of 101  fb−1. A signal having a statistical significance well in excess of 5 standard deviations is observed. Using the η→Ό+Ό− decay as normalization, the branching fraction B(η→Ό+Ό−Ό+Ό−)=[5.0±0.8(stat)±0.7(syst)±0.7(B2ÎŒ)]×10−9 is measured, where the last term is the uncertainty in the normalization channel branching fraction. This work achieves an improved precision of over 5 orders of magnitude compared to previous results, leading to the first measurement of this branching fraction, which is found to agree with theoretical predictions

    Observation of four top quark production in proton-proton collisions at √s = 13 TeV

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    Search for a high-mass dimuon resonance produced in association with b quark jets at s \sqrt{s} = 13 TeV

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    Search for Scalar Leptoquarks Produced via τ-Lepton-Quark Scattering in pppp Collisions at s=13TeV\sqrt{s}=13 TeV

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    The first search for scalar leptoquarks produced in τ-lepton–quark collisions is presented. It is based on a set of proton-proton collision data recorded with the CMS detector at the LHC at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 138  fb−1^{−1}. The reconstructed final state consists of a jet, significant missing transverse momentum, and a τ lepton reconstructed through its hadronic or leptonic decays. Limits are set on the product of the leptoquark production cross section and branching fraction and interpreted as exclusions in the plane of the leptoquark mass and the leptoquark-τ-quark coupling strength
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