Observation of the Λ⁰_b → J/ψΞ⁻K⁺ decay
Year: 2024
Type: article
Abstract: Using proton–proton collision data corresponding to an integrated luminosity of 140fb⁻¹ collected by the CMS experiment at s = 13TeV, the Λ⁰_b → J/ψΞ⁻K⁺ decay is observed for the first time, with a statistical significance exceeding 5 standard deviations. The relative branching fraction, with respect to the Λ⁰_b → ψ(2S)Λ decay, is measured to be B(Λ⁰_b → J/ψΞ⁻K⁺) / B(Λ⁰_b → ψ(2S)Λ) = [3.38 ± 1.02 ± 0.61 ± 0.03]%, where the first uncertainty is statistical, the second is systematic, and the third is related to the uncertainties in B(ψ(2S) → J/ψπ⁺π⁻) and B(Ξ⁻ → Λπ⁻).
Authors: CMS Collaboration, Hayrapetyan, Aram, Erdmann, Wolfram, Horisberger, Roland, Aarrestad, Thea K., Androsov, Konstantin, Backhaus, Malte, Calandri, Alessandro, Cazzaniga, Cesare, Datta, Kaustuv, De Cosa, Annapaola, Dissertori, Günther, Dittmar, M., Donegà, Mauro, Eble, Florian, Galli, Massimiliano, Gedia, Krunal, Glessgen, Franz, Grab, Christophorus, Hits, Dmitry Alexandrovich, Lustermann, Werner, Lyon, Anne-Mazarine, Manzoni, Riccardo Andrea, Marchegiani, Matteo, Marchese, Luigi, Martin Perez, Cristina, Mascellani, Anna, Nessi-Tedaldi, Francesca, Pauss, Felicitas, Perovic, Vasilije, Pigazzini, Simone, Ratti, Maria Giulia, Reichmann, Michael, Reissel, Christina, Reitenspiess, Thomas, Ristic, Branislav, Riti, Federica, Ruini, D., Sanz Becerra, Diego Alejandro, Seidita, Roberto, Steggemann, Jan, Valsecchi, Davide, Wallny, Rainer, et al.
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6947658986
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