Publications by authors named "Cms Collaboration"
A search for light long-lived particles decaying to displaced jets is presented, using a data sample of proton-proton collisions at a center-of-mass energy of 13.6 TeV, corresponding to an integrated luminosity of 34.7 fb$^{-1}$, collected with the CMS detector at the CERN LHC in 2022.
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- Entanglement is a fundamental concept in quantum mechanics, and this study focuses on its observation in particles generated at the Large Hadron Collider, particularly in top quark-antiquark events.
- The research analyzes data from proton-proton collisions at 13 TeV energy recorded in 2016 and identifies events with two oppositely charged leptons to measure entanglement levels using a specific observable derived from the production density matrix.
- The results show significant evidence of entanglement, with a measurement indicating a value of approximately -0.480 at the parton level, providing strong confirmation of quantum entanglement in top quark pairs with a significance of 5.1 standard deviations
The production of a pair of τ leptons via photon-photon fusion,γγ→ττ, is observed for the first time in proton-proton collisions, with a significance of 5.3 standard deviations. This observation is based on a data set recorded with the CMS detector at the LHC at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 138 fb.
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- The research tests lepton flavor universality in decays of B mesons, specifically analyzing the B±→K±μ+μ- and B±→K±e+e- decay processes.
- Utilizing data from 2018 proton-proton collisions at the LHC, the study involved around 10 billion b hadron decays to gather accurate results.
- The ratio of branching fractions R(K) was measured and found to be 0.78-0.23+0.47, which is close to the standard model prediction of R(K)≈1, and the integrated branching fraction for the B±→K±μ+μ- process was calculated as (12.42±0.68)
Measurements of the [Formula: see text][Formula: see text] production cross sections in proton-proton collisions at center-of-mass energies of 7 and 8[Formula: see text] are presented. Candidate events for the leptonic decay mode [Formula: see text], where [Formula: see text] denotes an electron or a muon, are reconstructed and selected from data corresponding to an integrated luminosity of 5.1 (19.
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