Study of tau decays involving kaons, spectral functions and determination of the strange quark mass
| dc.creator | Barate, R. | |
| dc.creator | Collaboration, ALEPH | |
| dc.date | 1999-03-11 | |
| dc.date.accessioned | 2026-07-07T12:02:30Z | |
| dc.date.available | 2026-07-07T12:02:30Z | |
| dc.description | All ALEPH measurements of branching ratios of tau decays involving kaons are summarized including a combination of results obtained with K^0_S and K^0_L detection. The decay dynamics are studied, leading to the determination of contributions from vector K^*(892) and K^{*}(1410), and axial-vector K_1(1270) and K_1(1400) 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 K\bar{K}πmode is compared with the corresponding cross section for low energy e^+e^- annihilation, yielding an axial-vector fraction of (94^{+6}_{-8})% for this mode. The branching ratio for tau decay into all strange final states is determined to be B(τ^-\to X^-(S=-1)ν_τ)=(28.7\pm1.2)\times 10^{-3}. The measured mass spectra of the strange tau decay modes are exploited to derive the S=-1 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 m_s(M_τ^2)=(176^{+46}_{-57}) MeV/c^2. The evolution down to 1 GeV gives m_s(1 {GeV}^2) = (234^{+61}_{-76}) MeV/c^2. | |
| dc.description | 34 pages, 12 figures | |
| dc.identifier | https://arxiv.org/abs/hep-ex/9903015 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/9903015 | |
| dc.identifier | Eur.Phys.J.C11:599-618,1999 | |
| dc.identifier | doi:10.1007/s100520050659 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/207463 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Study of tau decays involving kaons, spectral functions and determination of the strange quark mass | |
| dc.type | text |