@article{2e9cc5ed865742669b26e757d5411fc6, title = "Search for beautiful tetraquarks in the ϒ(1S)μ+μ− invariant-mass spectrum", abstract = "The $\Upsilon(1S)\mu^+\mu^-$ invariant-mass distribution is investigated for a possible exotic meson state composed of two $b$ quarks and two $\overline{b}$ quarks, $X_{b\overline{b}b\overline{b}}$. The analysis is based on a data sample of $pp$ collisions recorded with the LHCb detector at centre-of-mass energies $\sqrt{s} =$ 7, 8 and 13 TeV, corresponding to an integrated luminosity of 6.3 fb$^{-1}$. No significant excess is found, and upper limits are set on the product of the production cross-section and the branching fraction as functions of the mass of the $X_{b\overline{b}b\overline{b}}$ state. The limits are set in the fiducial volume where all muons have pseudorapidity in the range $[2.0,5.0]$, and the $X_{b\overline{b}b\overline{b}}$ state has rapidity in the range $[2.0,4.5]$ and transverse momentum less than 15 GeV/$c$.", author = "Peter Clarke and Greig Cowan and Stephan Eisenhardt and Silvia Gambetta and Franz Muheim and Matthew Needham and Stephen Playfer and LHCb Collaboration and Marco Pappagallo", year = "2018", month = oct, day = "12", doi = "10.1007/JHEP10(2018)086", language = "English", volume = "1810", journal = " Journal of High Energy Physics", issn = "1126-6708", publisher = "Springer-Verlag", }