All ALEPH measurements of branching ratios of decays involving kaons are summarized including a combination of results obtained with and detection. The decay dynamics are studied, leading to the determination of contributions from vector and , and axial-vector and resonances. Agreement with isospin symmetry is observed among the different final states. Under the hypothesis of the conserved vector current, the spectral function for the mode is compared with the corresponding cross section for low energy annihilation, yielding an axial-vector fraction of for this mode. The branching ratio for decay into all strange final states is determined to be . The measured mass spectra of the strange decay modes are exploited to derive the spectral function. A combination of strange and nonstrange spectral functions is used to determine the strange quark mass and nonperturbative contributions to the strange hadronic width. A method is developed to avoid the bad convergence of the spin zero hadronic component, with the result MeV/. The evolution down to 1 GeV gives .

Study of tau decays involving kaons, spectral functions and determination of the strange quark mass / R. Barate et al.; V. Ciulli; E. Focardi. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - ELETTRONICO. - 11:(1999), pp. 599-618. [10.1007/s100529900208]

Study of tau decays involving kaons, spectral functions and determination of the strange quark mass

CIULLI, VITALIANO;FOCARDI, ETTORE
1999

Abstract

All ALEPH measurements of branching ratios of decays involving kaons are summarized including a combination of results obtained with and detection. The decay dynamics are studied, leading to the determination of contributions from vector and , and axial-vector and resonances. Agreement with isospin symmetry is observed among the different final states. Under the hypothesis of the conserved vector current, the spectral function for the mode is compared with the corresponding cross section for low energy annihilation, yielding an axial-vector fraction of for this mode. The branching ratio for decay into all strange final states is determined to be . The measured mass spectra of the strange decay modes are exploited to derive the spectral function. A combination of strange and nonstrange spectral functions is used to determine the strange quark mass and nonperturbative contributions to the strange hadronic width. A method is developed to avoid the bad convergence of the spin zero hadronic component, with the result MeV/. The evolution down to 1 GeV gives .
1999
11
599
618
R. Barate et al.; V. Ciulli; E. Focardi
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/639930
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 135
  • ???jsp.display-item.citation.isi??? 140
social impact