Observation of the Λ_b<SUP>0</SUP> → χ_c1 (3872)pK<SUP>-</SUP> decay

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Aaij, R, Beteta, C Abellan, Adeva, B, Adinolfi, M, Aidala, CA, Ajaltouni, Z, Akar, S, Albicocco, P, Albrecht, J, Alessio, F et al (show 834 more authors) , Alexander, M, Albero, A Alfonso, Alkhazov, G, Cartelle, P Alvarez, Alves, AA Jr, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Andreassi, G, Andreotti, M, Andrews, JE, Archilli, F, d'Argent, P, Romeu, J Arnau, Artamonov, A, Artuso, M, Arzymatov, K, Aslanides, E, Atzeni, M, Audurier, B, Bachmann, S, Back, JJ, Baker, S, Balagura, V, Baldini, W, Baranov, A, Barlow, RJ, Barrand, GC, Barsuk, S, Barter, W, Bartolini, M, baryshnikov, F, Batozskaya, V, Batsukh, B, Battig, A, Battista, V, Bay, A, Beddow, J, Bedeschi, F, Bediaga, I, Beiter, A, Bel, LJ, Belin, S, Beliy, N, Bellee, V, Belloli, N, Belous, K, Belyaev, I, Ben-Haim, E, Bencivenni, G, Benson, S, Beranek, S, Berezhnoy, A, Bernet, R, Berninghoff, D, Bertholet, E, Bertolin, A, Betancourt, C, Betti, F, Bettler, MO, van Beuzekom, M, Bezshyiko, Ia, Bhasin, S, Bhom, J, Bifani, S, 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JOURNAL OF HIGH ENERGY PHYSICS, 09 (9). 028-.

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Abstract

Using proton-proton collision data, collected with the LHCb detector and corresponding to 1.0, 2.0 and 1.9fb$^{-1}$ of integrated luminosity at the centre-of-mass energies of 7, 8, and 13 TeV, respectively, the decay $\Lambda_b^0\to \chi_{c1}(3872)pK^-$ with $\chi_{c1}\to J/\psi\pi^+\pi^-$ is observed for the first time. The significance of the observed signal is in excess of seven standard deviations. It is found that $(58\pm15)\%$ of the decays proceed via the two-body intermediate state $\chi_{c1}(3872)\Lambda(1520)$. The~branching fraction with respect to that of the $\Lambda_b\rightarrow\psi(2S)p K^{-}$ decay mode, where the $\psi(2S)$~meson is reconstructed in the $J/\psi \pi^+\pi^-$ final state, is measured to be: \begin{equation*} \frac{\Lambda_b^0\to\chi_{c1}(3872)pK^-}{\Lambda_b\to\psi(2S)p K^-} \times \frac{\mathcal{B}(\chi_{c1} \to J/\psi \pi^+\pi^-)}{\mathcal{B}(\psi(2S)\to J/\psi \pi^+\pi^-)} = \left(5.4 \pm 1.1 \pm 0.2\right)\times 10^{-2}\,, \end{equation*} where the first uncertainty is statistical and the second is systematic.

Item Type:	Article
Additional Information:	19 pages, 2 figures. All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2019-023.html
Uncontrolled Keywords:	B physics, Branching fraction, Exotics, Hadron-Hadron scattering (experiments)
Depositing User:	Symplectic Admin
Date Deposited:	05 Dec 2019 15:45
Last Modified:	08 Oct 2023 21:44
DOI:	10.1007/JHEP09(2019)028
Open Access URL:	https://doi.org/10.1007/JHEP09(2019)028
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3064999