Observation of muonic Dalitz decays of $χ_{b}$ mesons and precise spectroscopy of hidden-beauty states
hep-ex
/ Authors
LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. Adefisoye, B. Adeva, M. Adinolfi, P. Adlarson
and 1129 more authors
C. Agapopoulou, C. A. Aidala, Z. Ajaltouni, S. Akar, K. Akiba, P. Albicocco, J. Albrecht, F. Alessio, M. Alexander, Z. Aliouche, P. Alvarez Cartelle, R. Amalric, S. Amato, J. L. Amey, Y. Amhis, L. An, L. Anderlini, M. Andersson, A. Andreianov, P. Andreola, M. Andreotti, D. Andreou, A. Anelli, D. Ao
/ Abstract
The decays of the $χ_{b1}(1P)$, $χ_{b2}(1P)$, $χ_{b1}(2P)$ and $χ_{b2}(2P)$ mesons into the $Υ(1S)μ^+μ^-$ final state are observed with a high significance using proton-proton collision data collected with the LHCb detector and corresponding to an integrated luminosity of 9fb$^{-1}$. The newly observed decays together with the $Υ(2S)\rightarrow Υ(1S)π^+π^-$ and $Υ(3S)\rightarrow Υ(2S)π^+π^-$ decay modes are used for precision measurements of the mass and mass splittings for the hidden-beauty states.