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Toponium Hunter's Guide
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abstract
We address the discovery and characterisation of toponium production at the Large Hadron Collider. In the dilepton decay mode, multivariate analyses of spin and colour observables could provide evidence that an excess of events present near the $t \bar t$ threshold corresponds to a spin-zero colour singlet. The semileptonic decay mode may also exhibit an excess near threshold, but is not expected to play any role in the toponium characterisation.
Forward citations
Cited by 10 Pith papers
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Top-quark mass interpretation from simulation of top-flavoured mesons
Comparing Pythia top-pair events to fictitious top-meson samples linked by HQET yields a 200–300 MeV shift between the Monte Carlo top mass and the pole mass.
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Extracting a Toponium Signal at the LHC with Spin and Quantum Information Tools
Spin and quantum-information observables add only marginal statistical power beyond kinematic variables for isolating toponium in near-threshold top-pair events, but improve interpretability.
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New physics in toponium's shadow?
Consistently including toponium bound-state effects inside the new-physics amplitude, not just the Standard Model one, reshapes the allowed mass–coupling region for a top-philic pseudoscalar near the top-antitop threshold.
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Topped baryons from QCD sum rules
QCD sum rules in HQET predict ground-state singly topped baryon masses near 174 GeV, some 1.1-1.5 GeV above the top quark pole mass.
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Updated predictions for toponium production at the LHC
Updated QCD prediction for top-pair production near threshold at 13 TeV: toponium bound-state effects plus NLL threshold resummation enhance the mass distribution by about 10% and give 12 pb in the 340 to 350 GeV bin ...
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Toponium: the smallest bound state and simplest hadron in quantum mechanics
Using the b-quark production ratio at sqrt(s) near 341 GeV, a simulated CEPC experiment could discover toponium at over 5 sigma and measure the top 1S mass to about 33 MeV.
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Phenomenology of Hypothetical Single-Top Hadronic States
QCD sum-rule calculations yield single-top baryon and meson masses near the top-quark mass, with a few channels slightly below the naive quark-sum threshold.
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Simulating toponium formation signals at the LHC
A Green's function re-weighting method implemented in MG5aMC simulates toponium formation and decay in LHC top-antitop events.
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Examining possible doubly topped baryon configurations
QCD sum rules give doubly topped baryon masses of 345-350 GeV, essentially the sums of the constituent quark masses, with no sign of genuine binding.
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Personal Memories of 50 Years of Quarkonia
A first-hand memoir of quarkonium history that concludes the recent ttbar threshold excess is likely toponium, a bound state of top and anti-top quarks.
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