Il Nuovo Cimento A (1971-1996)

, Volume 26, Issue 4, pp 317–328 | Cite as

Granddaughter trajectories in\(\bar pp\) annihilations

  • A. Donnachie
  • P. R. Thomas
Article
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Summary

We have fitted the differential cross-section data for pp annihilations to π−π+ and K−K+ with a model consisting of resonances together with a constituent interchange model background. We find strong evidence for meson resonances of mass 2.11, 2.3 and 2.48 GeV/c2 with spins of 3, 4 and 5 respectively. We also have weaker evidence for a J=2 resonance near threshold. Together with the ρ′(1600) these resonances from a « granddaughter » Regge trajectory approximately two units of angular momentum below ther> A2 trajectory.

Внучатые траектории при рр аннигиляциях

Резюме

Мы подгоняем данные д ля дифференциальных поперечных сечений р р аннигиляции в π-π+ и K-K+ с помощью модели, сост оящей из резонансов вместе с модельным фоном. Мы п олучаем данные для ме зонных резонансов с массами 2.11, 2.3 и 2.48 ГэВ/с2 со спинами 3, 4 и 5, соответственно. Мы та кже имеем экспериментал ьные указания для резонан са J=2 вблизи порога. Вме сте с ρ(1600) эти резонансы образуют « внучатую» траектори ю Редже, которая на две единиц ы по моменту ниже траекто рии ρ-A2.

Riassunto

Si sono approssimati i dati della sezione d’urto differenziale per gli le annichilazioni pp in π-π+ e K-K+ con un modello consistente di risonanze insieme ad un fondo del modello di interscambio costitutivo. Si trovano evidenti indizi di risonanze mesoniche di massa 2.11, 2.3 e 2.48 GeV/c2 con spin 3,4 e 5, rispettivamente. Si hanno anche indizi più deboli di una risonanza conJ = 2 nei pressi della soglia. Insieme con la risonanze ρ′(1600) queste formano una traiettoria di Eegge « nipote » all’incirca due unità di impulso angolare al di sotto della traiettoria ρ-A2.

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Copyright information

© Società Italiana di Fisica 1975

Authors and Affiliations

  • A. Donnachie
    • 1
    • 2
  • P. R. Thomas
    • 1
  1. 1.Department of PhysicsUniversity of ManchesterManchesterEngland
  2. 2.Daresbury LaboratoryWarringtonEngland

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