Measurement of the ratio of branching fractions of the decays Λ b 0  → ψ(2S)Λ and Λ b 0  → J/ψΛ

• Published in: The journal of high energy physics 2019-03, Vol.2019 (3), p.1-16
• Main Authors: Adeva, B, Akar, S, Alessio, F, P Alvarez Cartelle, Amhis, Y, Artamonov, A, Baesso, C, Barter, W, Beiter, A, Beliy, N, Burr, C, Byczynski, W, Calvi, M, Campana, P, Chubykin, A, Clarke, P E L, Cogneras, E, De Bruyn, K, De Miranda, J M, Decamp, D, Dovbnya, A, Durante, P, Dziurda, A, Dzyuba, A, Eitschberger, U, Fiorini, M, J Fu, A Gallas Torreira, J Garra Tico, Gaspar, C, Gavardi, L, Gazzoni, G, Gerick, D, Gibson, V, Gizdov, K, Gligorov, V V, Golutvin, A, Graziani, G, Gushchin, E, Hennessy, K, Ilten, P, Jans, E, Jost, B, Karodia, S, Kelsey, M, Kuonen, A K, Lanfranchi, G, Liu, X, Lupton, O, Malinin, A, Martellotti, G, Mead, J V, Meinert, N, Milanes, D A, Monteil, S, Morgunova, O, Moron, J, Nakada, T, Nguyen-Mau, C, Niet, R, D P O’Hanlon, Pappalardo, L L, Parker, W, Petruzzo, M, Pietrzyk, G, Polci, F, Polyakov, I, Popov, A, Pugatch, V, Rademacker, J H, Reichert, S, J Ruiz Vidal, Savrina, D, Schindler, H, Schmelzer, T, Schopper, A, Schubiger, M, Schune, M H, Serra, N, Shapkin, M, Shcheglov, Y, Sokoloff, M D, Storaci, B, Sun, L, Tobin, M, R Tourinho Jadallah Aoude, Tresch, M, Uwer, U, M van Beuzekom, Veneziano, G, Vieira, D, Voropaev, N, Waldi, R, Wang, J, Wark, H M, Wilson, F F, Wishahi, J, Q Xu, Yin, H, Yuan, X
• Format: Article
• Language: English
• Subjects: B physics; Branching fraction; Flavor physics; Hadron-Hadron scattering (experiments); High energy physics; Large Hadron Collider; Luminosity
• ISSN: 1029-8479
• DOI: 10.1007/JHEP03(2019)126

Using pp collisions corresponding to 3 fb−1 integrated luminosity, recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV, the ratio of branching fractionsℬΛb0→ψ2SΛ/ℬΛb0→J/ψΛ=0.513±0.023stat±0.016syst±0.011ℬ\[ \mathrm{\mathcal{B}}\left({\Lambda}_b^0\to \psi (2S)\Lambda \right)/\mathrm{\mathcal{B}}\left({\Lambda}_b^0\to J/\psi \Lambda \right)=0.513\pm 0.023\left(\mathrm{stat}\right)\pm 0.016\left(\mathrm{syst}\right)\pm 0.011\left(\mathrm{\mathcal{B}}\right) \]is determined. The first uncertainty is statistical, the second is systematic and the third is due to the external branching fractions used.