Modeling two-boson mass distributions, E(38 MeV) and Z(57.5 GeV)

Beveren, Eef van; Rupp, George; Coito, Susana

doi:10.48550/arxiv.1605.03437

Cited by 2 publications

(3 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The excited ρ spectrum provides an excellent laboratory for such efforts. To make life even harder, several bumps in meson production processes [25] may just be non-resonant threshold enhancements (see talk by E. van Beveren [26]).…”

Section: Discussionmentioning

confidence: 99%

Unquenching the Meson Spectrum: A Model Study of Exited $\rho $ Resonances

Rupp¹,

Coito²,

Beveren³

2016

Acta Phys. Pol. B Proc. Suppl.

View full text Add to dashboard Cite

Quark models taking into account the dynamical effects of hadronic decay often produce very different predictions for mass shifts in the hadron spectrum. The consequences for meson spectroscopy can be dramatic and completely obscure the underlying confining force. Recent unquenched lattice calculations of mesonic resonances that also include meson-meson interpolators provide a touchstone for such models, despite the present limitations in applicability. On the experimental side, the ρ(770) meson and its several observed radial recurrences are a fertile testing ground for both quark models and lattice computations. Here we apply a unitarised quark model that has been successful in the description of many enigmatic mesons to these vector ρ resonances and the corresponding P -wave ππ phase shifts. This work is in progress, with encouraging preliminary results.

show abstract

Section: Discussionmentioning

confidence: 99%

Unquenching the Meson Spectrum: A Model Study of Exited $\rho $ Resonances

Rupp¹,

Coito²,

Beveren³

2016

Acta Phys. Pol. B Proc. Suppl.

View full text Add to dashboard Cite

show abstract

“…3 in Ref. [12]), which were based [13] on general scattering theory [14], applied to multi-channel dispersion in the presence of a tower of bound states and resonances, the so-called Resonance Spectrum Expansion (RSE) [15,16,17]. The RSE amplitude in Ref.…”

Section: Dimeson Channelsmentioning

confidence: 99%

“…The RSE amplitude in Ref. [12] is restricted to single-channel scattering. However, a multi-channel generalisation is straightforward.…”

Section: Dimeson Channelsmentioning

confidence: 99%

General Unquenching Properties of Two-meson Scattering and Production Amplitudes

Beveren¹,

Rupp²

2017

Acta Phys. Pol. B Proc. Suppl.

View full text Add to dashboard Cite

Besides the unitarity and symmetry requirements for a multi-resonance scattering amplitude, several other natural conditions can easily exclude unrealistic proposals. In particular, the behaviour of singularities under the variation of model parameters yields important information. We discuss how resonance poles should move in the complex-energy plane when coupling constants and masses are varied, how resonances above threshold can turn into bound states below threshold, and how the light-quark spectrum can be turned into the spectrum of heavy quarks, with one and the same analytic expression for the scattering amplitude. Moreover, it is shown that perturbative approximations usually do not satisfy these natural conditions.

show abstract

Modeling two-boson mass distributions, E(38 MeV) and Z(57.5 GeV)

Abstract: Besides general features of the Resonance Spectrum Expansion for twoboson mass distributions, experimental results are discussed. Furthermore, E(38 MeV) and Z(57.5 GeV) are highlighted.

Cited by 2 publications

References 23 publications

Unquenching the Meson Spectrum: A Model Study of Exited $\rho $ Resonances

Unquenching the Meson Spectrum: A Model Study of Exited $\rho $ Resonances

General Unquenching Properties of Two-meson Scattering and Production Amplitudes

Contact Info

Product

Resources

About