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Title: Search for beautiful tetraquarks in the ϒ(1S)μ+μ−invariant-mass spectrum
Authors: Aaij, Roel
Adeva, Bernardo
Adinolfi, Marco
Panshin, Gennady Leonidovich
Strokov, Sergey Aleksandrovich
Vagner, Aleksandr Rudolfovich
Keywords: физика; адронное взаимодействие; тяжелые кварки
Issue Date: 2018
Publisher: Томский политехнический университет
Citation: Search for beautiful tetraquarks in the ϒ(1S)μ+μ−invariant-mass spectrum / R. Aaij [et al.] // Journal of High Energy Physics. — 2018. — № 10. — [86, 22 p.].
Abstract: The (1S)μ+μ− invariant-mass distribution is investigated for a possible exotic meson state composed of two b quarks and two b¯¯b¯ quarks, Xbb¯bb¯Xbb¯bb¯. The analysis is based on a data sample of ppcollisions recorded with the LHCb detector at centre-of-mass energies s√=7s=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 Xbb¯bb¯Xbb¯bb¯ state. The limits are set in the fiducial volume where all muons have pseudorapidity in the range [2.0, 5.0], and the Xbb¯bb¯Xbb¯bb¯ state has rapidity in the range [2.0, 4.5] and transverse momentum less than 15 GeV/c.
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