102 citations · 707 across the 46 of their papers we have counts for
44 papers · 1 filter
Bottomonium vector resonances and threshold effects
E. van Beveren, G. Rupp
The bottomonium spectrum is the perfect testing ground for the confining potential and unitarisation effects. The bottom quark is about three times heavier than the charm quark, so…
RSE production amplitude and possible evidence of a (pseudo)scalar boson at about 57 GeV
Eef van Beveren, George Rupp
Threshold enhancements predicted by the Resonance-Spectrum-Expansion (RSE) production amplitude and observed by the BaBaR Collaboration in open-bottom production above the $B\bar{B…
Comment on "Scrutinizing pion-pion scattering in light of recent lattice phase shifts"
Eef van Beveren, George Rupp
In a recent paper by Xiu-Li Gao, Zhi-Hui Guo, Zhiguang Xiao, and Zhi-Yong Zhou, Phys. Rev. D 105, 094002 (2022), here referred to as I, -wave scattering phase shifts obtain…
Why static bound-state calculations of tetraquarks should be met with scepticism
George Rupp, Eef van Beveren
Recent experimental signals have led to a revival of tetraquarks, the hypothetical hadronic states proposed by Jaffe in 1976 to explain the light scalar mesons. Meso…
Modeling two-boson mass distributions, E(38 MeV) and Z(57.5 GeV)
Eef van Beveren, George Rupp, Susana Coito
Besides general features of two-boson mass distributions, experimental results are are discussed. Furthermore, E(38 MeV) and Z(57.5 GeV) are highlighted.
Unquenched quark-model calculation of excited resonances and P-wave phase shifts
Susana Coito, George Rupp, Eef van Beveren
The vector resonance, its radial recurrences, and the corresponding P-wave phase shifts are investigated in an unquenched quark model with all classes of relevant dec…
Unquenching weak substructure
Eef van Beveren, George Rupp, Susana Coito
On assuming that Weak substructure has a dynamics which is similar to quantum chromodynamics but much stronger, we conclude that unquenching is indispensable for predictions on the…
electromagnetic decay in a coupled-channel model
Marco Cardoso, George Rupp, Eef van Beveren
A multichannel Schrödinger equation with both quark-antiquark and meson-meson components, using a harmonic-oscillator potential for confinement and a delta-shell string-…
Unquenched quark-model calculation of X(3872) electromagnetic decays
Marco Cardoso, George Rupp, Eef van Beveren
A recent quark-model description of X(3872) as an unquenched state is generalised by now including all relevant meson-meson configurations, in order to…
On the existence of a superlight scalar boson
Eef van Beveren, Susana Coito, George Rupp
In this lecture we show that the study of hadronic resonances is severely hampered by the lack of accurate data and, moreover, that for similar reason the study of Weak substructur…
Substructures from weak interactions in light of possible threshold signals at LEP and LHC
Eef van Beveren, Susana Coito, George Rupp
We present indications of possible substructures from weak interactions, by inspecting LEP and LHC date and inferring threshold effects due to the production of pairs of composite…
X(3872) is not a true molecule
Susana Coito, George Rupp, Eef van Beveren
A solvable coordinate-space model is employed to study the component of the X(3872) wave function, by coupling a confined state to the almost unbound…
Reply to Comment on 'Material evidence of a 38 MeV boson'
Eef van Beveren, George Rupp
We reply to a very recent Comment arxiv:1204.2349 by Bernhard, Friedrich, Schlueter, and Schoenning for the COMPASS Collaboration, in which it is stated that Monte-Carlo simulation…
Comment on "Observation of a New chi_b State in Radiative Transitions to Upsilon_1S and Upsilon_2S at ATLAS"
Eef van Beveren, George Rupp
We comment on the recent observation of chi_b states by the ATLAS Collaboration and contest their peremptory interpretation of the highest of the three observed structures as the c…
Material evidence of a 38 MeV boson
Eef van Beveren, George Rupp
We present further and more compelling evidence of the existence of E(38), a light boson that most probably couples exclusively to quarks and gluons. Observations presented in a pr…
Towards Meson Spectroscopy Instead of Bump Hunting
George Rupp, Susana Coito, Eef van Beveren
Mesonic resonances are generally observed in data as narrow, moderately broad, or wide peaks in scattering or production processes. In the eyes of nearly all experimentalists, any…
Quasi-bound states in the continuum: a dynamical coupled-channel calculation of axial-vector charmed mesons
Susana Coito, George Rupp, Eef van Beveren
Masses and widths of the charmed axial-vector mesons , , , and are calculated nonperturbatively in the Resonance-Spectrum-Expansi…
First indications of the existence of a 38 MeV light scalar boson
Eef van Beveren, George Rupp
We present evidence for the existence of a light scalar particle that most probably couples exclusively to gluons and quarks. Theoretical and phenomenological arguments are present…
Observation of a hadronic interference effect in annihilation processes
Eef van Beveren, George Rupp
We present evidence for small oscillations we observe in electron-positron and proton-antiproton annihilation data, with a periodicity of 76+-2 MeV, independent of the beam energy.…
The quark-antiquark spectrum from upside down
Eef van Beveren, George Rupp
We argue that the spectra of quark-antiquark systems should better be studied from higher radial excitations and, in particular, from configurations with well-defined quantum numbe…
Light and heavy at the end of the funnel
Eef van Beveren, George Rupp
We show that, by taking a bare mass spectrum with constant spacings for the quark-antiquark propagators, which is subject to considerable mass shifts from meson loops, one adequate…
Delicate interplay between the D0-D*0, rho0-J/psi, and omega-J/psi channels in the X(3872) resonance
Susana Coito, George Rupp, Eef van Beveren
The nature of the X(3872) enhancement is analysed in the framework of the Resonance-Spectrum Expansion, by studying it as a regular charmonium state, though strongl…
Evidence for the psi(5S) and psi(4D) c-cbar vector resonances
Eef van Beveren, George Rupp
We present evidence for the psi(5S) and psi(4D) c-cbar vector resonances in experimental data published by the Belle and BaBar Collaborations. Central masses and resonance widths a…
Complex masses in the S-matrix
George Rupp, Susana Coito, Eef van Beveren
Most excited hadrons have multiparticle strong decay modes, which can often be described as resulting from intermediate states containing one or two resonances. In a theoretical ap…