@Article{LHCbCollaborationAaij_etal2023,
author="LHCb Collaboration (Aaij, R. et al
and Jaimes Elles, S. J.
and Jashal, B. K.
and Martinez-Vidal, F.
and Oyanguren, A.
and Rebollo De Miguel, M.
and Remon Alepuz, C.
and Ruiz Vidal, J.
and Sanderswood, I.
and Zhuo, J.",
title="Observation of the B+ {\textrightarrow} J$\psi$$\eta${\textquoteright}K+ decay",
journal="Journal of High Energy Physics",
year="2023",
publisher="Springer",
volume="08",
number="8",
pages="174--27pp",
optkeywords="B Physics; Branching fraction; Charm Physics; Hadron-Hadron Scattering",
abstract="The B+ -> J psi eta{\textquoteright}K+ decay is observed for the first time using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8, and 13TeV, corresponding to a total integrated luminosity of 9 fb(-1). The branching fraction of this decay is measured relative to the known branching fraction of the B+ -> psi(2S)K+ decay and found to be B(B+ -> J psi eta{\textquoteright}K+)/B(B+ -> psi(2S)K+) = (4.91 +/- 0.47 +/- 0.29 +/- 0.07) x 10(-2), where the first uncertainty is statistical, the second is systematic and the third is related to external branching fractions. A first look at the J/psi eta{\textquoteright} mass distribution is performed and no signal of intermediate resonances is observed.",
optnote="WOS:001188365600001",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=6025), last updated on Wed, 10 Apr 2024 12:46:09 +0000",
issn="1029-8479",
doi="10.1007/JHEP08(2023)174",
opturl="https://arxiv.org/abs/2303.09443",
opturl="https://doi.org/10.1007/JHEP08(2023)174",
language="English"
}