Light-Quark Vector-Meson Spectroscopy

Donnachie, A.; Kalashnikova, Yu. S.

doi:10.1063/1.1482431

Cited by 3 publications

(3 citation statements)

References 43 publications

(60 reference statements)

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“…It does not seem that this is an artifact of the fit or due to poor quality of the data and we had to accept this signal as a genuine one. We found independent support in [77,31,32,33] resulting in an accumulated evidence for a ρ resonance around 1200 MeV. Note that the sources of this evidence are quite different.…”

Section: Time-delay and Phase Shiftmentioning

confidence: 57%

“…In the 2002 edition [5] this entry has been removed due to the lack of further evidence supporting the old data. In the same year this controversy has been revived by an experimental indication of an isovector state with mass around 1200 MeV [31,32,33]. As noted in [33] this is also supported by the γp → (ωπ)p reaction, where one finds a mass enhancement in the ωπ system which is partly attributed to additional ρ meson [34].…”

Section: A Short Survey Of Relevant Mesonic Resonancesmentioning

confidence: 96%

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Collision times in ππ and πK scattering and spectroscopy of meson resonances

2003

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Using the concept of collision time (time delay) introduced by Eisenbud and Wigner and its connection to on-shell intermediate unstable states, we study mesonic resonances in ππ and πK scattering. The time-delay method proves its usefulness by revealing the spectrum of the well-known ρ -and K * -mesons and by supporting some speculations on ρ-mesons in the 1200 MeV region. We use this method further to shed some light on more speculative meson resonances, among others the enigmatic scalars. We confirm the existence of chiralons below 1 GeV in the unflavoured and strange meson sector.

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Section: Time-delay and Phase Shiftmentioning

confidence: 57%

Section: A Short Survey Of Relevant Mesonic Resonancesmentioning

confidence: 96%

Collision times in ππ and πK scattering and spectroscopy of meson resonances

2003

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“…The ρ 3 (1690) has a much higher mass than the ρ(1450) (which is likely the radial excitation of the ρ(770), see however ref. [26]). Based on a large number of radial excitations, Bugg concluded [27] that the mean increase in squared mass per radial excitation is 1.143 ± 0.009 GeV 2 .…”

Section: Radial Excitationsmentioning

confidence: 99%

Baryon Resonances and Strong QCD

Klempt

2003

Baryons 2002

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d, and s quarks in the SU(3) classification) fall on Regge trajectories. When their squared masses are plotted against the intrinsic orbital angular momenta L, ∆ * 's with even and odd parity can be described by the same Regge trajectory. For a given L, nucleon resonances with spin S=3/2 are approximately degenerate in mass with ∆ resonances. To which total angular momentum L and S couple has no significant impact on the baryon mass. Nucleons with spin 1/2 are shifted in mass; the shift is -in units of squared masses -proportional to the component in the wave function which is antisymmetric in spin and flavor. Based on these observations, a new baryon mass formula is proposed which reproduces nearly all known baryon masses. It is shown that the masses are compatible with a quark-diquark picture while the richness of the experimentally known states require three particles to participate in the dynamics. This conflict is resolved by proposing that quarks polarize the QCD condensates and are surrounded by a polarization cloud shielding the color. A new interpretation of constituent quarks as colored quark clusters emerges; their interaction is responsible for the mass spectrum. Fast flavor exchange between the colored quark clusters exhausts the dynamical richness of the three-particle dynamics.The colored-quark-cluster model provides a mechanism in which the linear confinement potential can be traced to the increase of the volume in which the condensates are polarized. The quark-spin magnetic moment induces currents in the polarized condensates which absorb the quark-spin angular momentum: the proton spin is not carried by quark spins. The model provides a new picture of hybrids and glueballs.

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The antinucleon–nucleon interaction at low energy: Annihilation dynamics

2005

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The general properties of antiproton-proton annihilation at rest are presented, with special focus on the two-meson final states. The data exhibit remarkable dynamical selection rules: some allowed annihilation modes are suppressed by one order of magnitude with respect to modes of comparable phase-space. Various phenomenological analyses are reviewed, based on microscopic quark dynamics or symmetry considerations. The role of initial-and final-state interaction is also examined.

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Light-Quark Vector-Meson Spectroscopy

Cited by 3 publications

References 43 publications

Collision times in ππ and πK scattering and spectroscopy of meson resonances

Collision times in ππ and πK scattering and spectroscopy of meson resonances

Baryon Resonances and Strong QCD

The antinucleon–nucleon interaction at low energy: Annihilation dynamics

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