Study of charmonium and charmonium-like contributions in B+ → J/ψηK+ decays

• Main Authors: Aaij, R. (Author), Abdelmotteleb, A. S. W. (Author), Abellán Beteta, C. (Author), Abudinén, F. (Author), Ackernley, T. (Author), Adeva, B. (Author), Adinolfi, M. (Author), Afsharnia, H. (Author), Agapopoulou, C. (Author), Aidala, C. A. (Author), Aiola, S. (Author), Ajaltouni, Z. (Author), Akar, S. (Author), Albrecht, J. (Author), Alessio, F. (Author), Alexander, M. (Author)
• Format: Article
• Language: English
• Published: Springer Berlin Heidelberg, 2022-04-19T12:51:29Z.
• Subjects: Article
• Online Access: Get fulltext

 Abstract A study of B+ → J/ψηK+ decays, followed by J/ψ → μ+μ− and η → γγ, is performed using a dataset collected with the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb−1. The J/ψη mass spectrum is investigated for contributions from charmonia and charmonium-like states. Evidence is found for the B+ → (ψ2(3823) → J/ψη)K+ and B+ → (ψ(4040) → J/ψη)K+ decays with significance of 3.4 and 4.7 standard deviations, respectively. This constitutes the first evidence for the ψ2(3823) → J/ψη decay.