Abstract
The decays B+ → J/ψπ+π−K+ are studied using a data set corresponding to an integrated luminosity of 9 fb−1 collected with the LHCb detector in proton-proton collisions between 2011 and 2018. Precise measurements of the ratios of branching fractions with the intermediate ψ2(3823), χc1(3872) and ψ(2S) states are reported. The values are
where the first uncertainty is statistical and the second is systematic. The decay of B+ → ψ2(3823)K+ with ψ2(3823) → J/ψπ+π− is observed for the first time with a significance of 5.1 standard deviations. The mass differences between the ψ2(3823), χc1(3872) and ψ(2S) states are measured to be
resulting in the most precise determination of the χc1(3872) mass. The width of the ψ2(3823) state is found to be below 5.2 MeV at 90% confidence level. The Breit-Wigner width of the χc1(3872) state is measured to be
which is inconsistent with zero by 5.5 standard deviations.
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A. Hicheur, S. Sellam and C. Göbel are associated to Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
U. Egede, T. Hadavizadeh and M. Williams are associated to STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
J. Hu, H. Li, G. Liu, H. Xing, L. Bian, H. Cai, B. Fang, L. Sun and J. Wang are associated to Center for High Energy Physics, Tsinghua University, Beijing, China
D. A. Milanes, I. A. Monroy and J. A. Rodriguez Lopez are associated to LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
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A. Malinin, A. Petrov, V. Shevchenko, F. Baryshnikov, S. Didenko, A. Golutvin, A. Kondybayeva, O. Lantwin, N. Polukhina, E. Shmanin, O. Steinkamp, D. Strekalina, E. Trifonova, E. van Herwijnen, A. Kharisova, G. Panshin, S. Strokov and A. Vagner are associated to Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia, Moscow, Russia
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The LHCb collaboration., Aaij, R., Abellán Beteta, C. et al. Study of the ψ2(3823) and χc1(3872) states in B+ → (J/ψπ+π−)K+ decays. J. High Energ. Phys. 2020, 123 (2020). https://doi.org/10.1007/JHEP08(2020)123
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DOI: https://doi.org/10.1007/JHEP08(2020)123