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Would a Deeply Bound $b\bar b b\bar b$ Tetraquark Meson be Observed at the LHC?

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abstract

There has been much theoretical speculation about the existence of a deeply bounded tetra-bottom state. Such a state would not be expected to be more than a GeV below $\Upsilon\Upsilon$ threshold. If such a state exists below the $\eta_b\eta_b$ threshold it would be narrow, as Zweig allowed strong decays are kinematically forbidden. Given the observation of $\Upsilon$ pair production at CMS, such a state with a large branching fraction into $\Upsilon \Upsilon^*$ is likely discoverable at the LHC. The discovery mode is similar to the SM Higgs decaying into four leptons through the $Z Z^*$ channel. The testable features of both production and the four lepton decays of such a tetra-bottom ground state are presented. The assumptions required for each feature are identified, allowing the application of our results more generally to a resonance decaying into four charged leptons (through the $\Upsilon\Upsilon^*$ channel) in the same mass region.

fields

hep-ph 1

years

2026 1

verdicts

UNVERDICTED 1

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Investigation of fully heavy tetraquark within chiral quark model

hep-ph · 2026-06-05 · unverdicted · novelty 4.0

Chiral quark model calculations find resonance states in ccar{c}ar{c} at ~7002 MeV (width 54 MeV) and ~7227 MeV (width 66 MeV) as X(6900) and X(7200) candidates, plus one bbar{b}ar{b} resonance at ~19743 MeV (width 67 MeV).

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  • Investigation of fully heavy tetraquark within chiral quark model hep-ph · 2026-06-05 · unverdicted · none · ref 14 · internal anchor

    Chiral quark model calculations find resonance states in ccar{c}ar{c} at ~7002 MeV (width 54 MeV) and ~7227 MeV (width 66 MeV) as X(6900) and X(7200) candidates, plus one bbar{b}ar{b} resonance at ~19743 MeV (width 67 MeV).