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Results for “near threshold”
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Near-threshold π − photoproduction on the deuteron
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Observation of the near-threshold intruder 0 – resonance in 12 Be
A resonant state at $3.21^{+0.12}_{–0.04}$ MeV, located just above the one-neutron separation threshold, was observed for the first time in 12 Be from the 11 Be(d,p) 12 Be one-neutron transfer reaction in inverse kinematics. This state is assigned a spin-parity of 0 – according to the systematics of the level scheme of the N=8 isotones and decay-width analysis. Gamow coupled-channel and Gamow shell-model calculations show the importance of the continuum coupling, which dramatically influences the excitation energy and ordering of low-lying states. Various exotic structures associated with cross-shell intruding configurations in 12 Be and in its isotonic nucleus 11 Li are comparably discussed.
ψ ( * ) p scattering length based on near-threshold charmonium photoproduction
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QCD analysis of near-threshold quarkonium leptoproduction at large photon virtualities
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Measurement of cross section for e + e − → Ξ − Ξ ¯ + near threshold at BESIII
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QCD analysis of near-threshold photon-proton production of heavy quarkonium
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Observation of a near-threshold enhancement in the Λ Λ ¯ mass spectrum from e + e − → ϕ Λ Λ ¯ at s from 3.51 to 4.60 GeV
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Electroproduction of heavy vector mesons using holographic QCD: From near threshold to high energy regimes
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Near threshold heavy quarkonium photoproduction at large momentum transfer
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J / ψ near threshold in holographic QCD: A and D gravitational form factors
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Updated analysis of near-threshold heavy quarkonium production for probe of proton’s gluonic gravitational form factors
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Dynamics in near-threshold J / ψ photoproduction
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Near-threshold states in coupled D D * − D * D * scattering from lattice QCD
The first determination of doubly charmed isospin-0 coupled-channel D D * − D * D * scattering amplitudes from lattice quantum chromodynamics (QCD) is presented. The finite-volume spectrum is computed for three lattice volumes with a light-quark mass corresponding to m π ≈ 391 MeV and is used to extract the scattering amplitudes in J P = 1 + via the Lüscher quantization condition. By analytically continuing the scattering amplitudes to complex energies, a T c c pole corresponding to a virtual bound state is found below D D * threshold. We also find a second pole, T c c ′ , corresponding to a resonance pole below the kinematically closed D * D * channel, to which it has a strong coupling. A nonzero coupling is robustly found between the S -wave D D * and D * D * channels producing a clear cusp in the D D * amplitude at the D * D * threshold energy. This suggests that the experimental T c c ′ should be observable in D D * and D * D * final states at ongoing experiments. Published by the American Physical Society 2025
Observation of a Near-Threshold Structure in the K + Recoil-Mass Spectra in e + e − → K + ( D s − D * 0 + D s * − D 0 )
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Interpretation of Neutral Charm Mesons near Threshold as Unparticles
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Evidence for a Neutral Near-Threshold Structure in the K S 0 Recoil-Mass Spectra in e + e − → K S 0 D s + D * − and e + e − → K S 0 D s * + D −
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