Observation of the Λ b 0 → J / ψ Ξ - K + decay

• Published in: The European physical journal. C, Particles and fields Vol. 84; no. 10; p. 1062
• Main Authors: Hayrapetyan, A, Tumasyan, A, Adam, W, Andrejkovic, J W, Bergauer, T, Chatterjee, S, Damanakis, K, Dragicevic, M, Valle, A Escalante Del, Hussain, P S, Jeitler, M, Krammer, N, Liko, D, Mikulec, I, Schieck, J, Schöfbeck, R, Schwarz, D, Sonawane, M, Templ, S, Waltenberger, W, Wulz, C-E, Darwish, M R, Janssen, T, Mechelen, P Van, Bols, E S, D'Hondt, J, Dansana, S, De Moor, A, Delcourt, M, El Faham, H, Lowette, S, Makarenko, I, Müller, D, Sahasransu, A R, Tavernier, S, Tytgat, M, Van Putte, S, Vannerom, D, Clerbaux, B, De Lentdecker, G, Favart, L, Hohov, D, Jaramillo, J, Khalilzadeh, A, Lee, K, Mahdavikhorrami, M, Malara, A, Paredes, S, Pétré, L, Postiau, N, Thomas, L, Bemden, M Vanden, Velde, C Vander, Vanlaer, P, De Coen, M, Dobur, D, Hong, Y, Knolle, J, Lambrecht, L, Mestdach, G, Rendón, C, Samalan, A, Skovpen, K, Bossche, N Van Den, Wezenbeek, L, Benecke, A, Bruno, G, Caputo, C, Delaere, C, Donertas, I S, Giammanco, A, Jaffel, K, Jain, Sa, Lemaitre, V, Lidrych, J, Mastrapasqua, P, Mondal, K, Tran, T T, Wertz, S, Alves, G A, Coelho, E, Hensel, C, De Oliveira, T Menezes, Moraes, A, Teles, P Rebello, Soeiro, M, Júnior, W L Aldá, Pereira, M Alves Gallo, Filho, M Barroso Ferreira, Malbouisson, H Brandao, Carvalho, W, Chinellato, J, Da Costa, E M, Da Silveira, G G, De Jesus Damiao, D, De Souza, S Fonseca, Martins, J, Herrera, C Mora, Amarilo, K Mota, Mundim, L
• Format: Journal Article
• Language: English
• Published: France 2024
• ISSN: 1434-6044
• DOI: 10.1140/epjc/s10052-024-13114-9

Using proton-proton collision data corresponding to an integrated luminosity of collected by the CMS experiment at , the decay is observed for the first time, with a statistical significance exceeding 5 standard deviations. The relative branching fraction, with respect to the decay, is measured to be , where the first uncertainty is statistical, the second is systematic, and the third is related to the uncertainties in and .