Measurement of the $\Upsilon$(1S) pair production cross section and search for resonances decaying to $\Upsilon$(1S)$\mu^+\mu^-$ in proton-proton collisions at $\sqrt{s} =$ 13 TeV

The CMS collaboration
Phys.Lett.B 808 (2020) 135578, 2020.

Abstract (data abstract)
CERN-LHC. The fiducial cross section for Y(1S) pair production in proton-proton collisions at a center-of-mass energy of 13 TeV in the region where both Y(1S) mesons have an absolute rapidity below 2.0 is measured to be 79 \pm 11 (stat) \pm 6 (syst) \pm 3 (B) pb assuming the mesons are produced unpolarized. The last uncertainty corresponds to the uncertainty in the Y(1S) meson dimuon branching fraction. The measurement is performed in the final state with four muons using proton-proton collision data collected in 2016 by the CMS experiment at the LHC, corresponding to an integrated luminosity of 35.9fb-1. This process serves as a standard model reference in a search for narrow resonances decaying to Y(1S)mu+mu- in the same final state. Such a resonance could indicate the existence of a tetraquark that is a bound state of two b quarks and two b antiquarks. The tetraquark search is performed for masses in the vicinity of four times the bottom quark mass, between 17.5 and 19.5 GeV, while a generic search for other resonances is performed for masses between 16.5 and 27 GeV. No significant excess of events compatible with a narrow resonance is observed in the data. Limits on the production cross section times branching fraction to four muons via an intermediate Y(1S) resonance are set as a function of the resonance mass.

  • Table 1

    Data from Fig. 4 left

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    The fiducial cross section measured in bins of the absolute rapidity difference between the mesons for events in the fiducial...

  • Table 2

    Data from Fig. 4 right

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    The fiducial cross section measured in bins of the invariant mass of the two mesons for events in the fiducial...

  • Table 3

    Data from Fig. 1 of supplementary material

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    The fiducial cross section measured in bins of the transverse momentum of the meson pair for events in the fiducial...

  • Table 4

    Data from Fig. 2 of supplementary material

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    The fiducial cross section measured in bins of the azimuthal angle difference between the mesons for events in the fiducial...

  • Table5

    Data from Fig. 8 top left

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    The expected and observed 95% CL limits on the product of the cross section and branching fraction for a tetraquark....

  • Table6

    Data from Fig. 8 top right

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    The expected and observed 95% CL limits on the product of the cross section and branching fraction for a scalar...

  • Table7

    Data from Fig. 8 bottom left

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    The expected and observed 95% CL limits on the product of the cross section and branching fraction for a pseudoscalar...

  • Table8

    Data from Fig. 8 bottom right

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    The expected and observed 95% CL limits on the product of the cross section and branching fraction for a spin-2...

  • Table9

    Data used in Fig.2 and Fig.3

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    Kinematic properties and charges of the four muons selected in data in the signal region for the measurement of the...

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