# Study of $\chi_{b}$ meson production in pp collisions at $\sqrt{s}=7$ and 8TeV and observation of the decay $\chi_{b}\rightarrow \Upsilon(3S) \gamma$

Abstract : A study of $\chi_{b}$ meson production at LHCb is performed on proton-proton collision data, corresponding to 3.0fb$^{-1}$ of integrated luminosity collected at centre-of-mass energies $\sqrt{s}=7$ and 8TeV. The fraction of $\Upsilon(nS)$ mesons originating from $\chi_{b}$ decays is measured as a function of the $\Upsilon$ transverse momentum in the rapidity range $2.0 < y^{\Upsilon} < 4.5$. The radiative transition of the $\chi_{b}(3P)$ meson to $\Upsilon(3S)$ is observed for the first time. The $\chi_{b1}(3P)$ mass is determined to be $m(\chi_{b1}(3P)) = 10\,511.3 \pm 1.7 \pm 2.5 MeV/c^2,$ where the first uncertainty is statistical and the second is systematic.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-01053215
Contributor : Danielle Cristofol <>
Submitted on : Wednesday, July 30, 2014 - 8:30:07 AM
Last modification on : Monday, July 26, 2021 - 4:12:02 PM

### Citation

R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Ziad Ajaltouni, et al.. Study of $\chi_{b}$ meson production in pp collisions at $\sqrt{s}=7$ and 8TeV and observation of the decay $\chi_{b}\rightarrow \Upsilon(3S) \gamma$. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2014, 74, pp.3092. ⟨10.1140/epjc/s10052-014-3092-z⟩. ⟨in2p3-01053215⟩

Record views