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Is $\alpha'$ also the $e\pm$ annihilation scale ?
A model for the annihilation of electron-positron pairs into hadrons for q/sup 2/=s>4 GeV/sup 2/ and up to the highest measured energies is developed. The main ingredients are point-like couplings between three resonances and photons and the high level of opening thresholds that follows from an e...
Autores principales: | , |
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Lenguaje: | eng |
Publicado: |
1974
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1016/0550-3213(74)90204-1 http://cds.cern.ch/record/880473 |
Sumario: | A model for the annihilation of electron-positron pairs into hadrons for q/sup 2/=s>4 GeV/sup 2/ and up to the highest measured energies is developed. The main ingredients are point-like couplings between three resonances and photons and the high level of opening thresholds that follows from an effective Lagrangian formalism. The model gives an almost constant annihilation cross section, soft pions everywhere and at all energies, high multiplicities and a large absolute cross section. The details of all exclusive channels are also predicted. Other consequences of this point of view concern the discovery of hitherto ignored couplings in three resonances and photons and the high level of opening threshold that follows from an effective Lagrangian formalism. The model gives an almost constant annihilation cross section, soft pions everywhere and at all energies, high multiplicities and a large absolute crosssection. The details of all exclusive channels are also predicted. Other consequences of this point of view concern the discovery of hitherto ignored couplings in low-energy photon initiated reactions. It is argued that the energy regime explored by SPEAR is not the asymptopia and possible further constancy of the cross section in a range of s is discussed. (4 refs). |
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