Browsing by Author "Sonnadara,D.U.J."

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Citation Count: 1
Measurement of Energy Correlators inside Jets and Determination of the Strong Coupling Formula Presented
(American Physical Society, 2024) Hayrapetyan,A.; Tumasyan,A.; Adam,W.; Andrejkovic,J.W.; Bergauer,T.; Chatterjee,S.; Sonnadara,D.U.J.
Energy correlators that describe energy-weighted distances between two or three particles in a hadronic jet are measured using an event sample of Formula Presented proton-proton collisions collected by the CMS experiment and corresponding to an integrated luminosity of Formula Presented. The measured distributions are consistent with the trends in the simulation that reveal two key features of the strong interaction: confinement and asymptotic freedom. By comparing the ratio of the measured three- and two-particle energy correlator distributions with theoretical calculations that resum collinear emissions at approximate next-to-next-to-leading-logarithmic accuracy matched to a next-to-leading-order calculation, the strong coupling is determined at the Formula Presented boson mass: Formula Presented, the most precise Formula Presented value obtained using jet substructure observables. © 2024 CERN, for the CMS Collaboration.
Citation Count: 0
Search for Baryon Number Violation in Top Quark Production and Decay Using Proton-Proton Collisions at Formula Presented
(American Physical Society, 2024) Hayrapetyan,A.; Tumasyan,A.; Adam,W.; Andrejkovic,J.W.; Bergauer,T.; Chatterjee,S.; Sonnadara,D.U.J.
A search is presented for baryon number violating interactions in top quark production and decay. The analysis uses data from proton-proton collisions at a center-of-mass energy of 13 TeV, collected with the CMS detector at the LHC with an integrated luminosity of Formula Presented. Candidate events are selected by requiring two oppositely charged leptons (electrons or muons) and exactly one jet identified as originating from a bottom quark. Multivariate discriminants are used to separate the signal from the background. No significant deviation from the standard model prediction is observed. Upper limits are placed on the strength of baryon number violating couplings. For the first time the production of single top quarks via baryon number violating interactions is studied. This allows the search to set the most stringent constraints to date on the branching fraction of the top quark decay to a lepton, an up-type quark (Formula Presented or Formula Presented), and a down-type quark (Formula Presented, Formula Presented, or Formula Presented). The results improve the previous bounds by 3 to 6 orders of magnitude based on the fermion flavor combination of the baryon number violating interactions. © 2024 CERN, for the CMS Collaboration.