Search for beautiful tetraquarks in the \u03d2(1S)\u03bc+\u03bc\u2212 invariant-mass spectrum

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doi:10.1007/jhep10(2018)086

Abstract

The ϒ(1S)μ+μ− invariant-mass distribution is investigated for a possible exotic meson state composed of two b quarks and two overline{b} quarks, {X}_{boverline{b}boverline{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}_{boverline{b}boverline{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}_{boverline{b}boverline{b}} state has rapidity in the range [2.0, 4.5] and transverse momentum less than 15 GeV/c.

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