DOI 10.1007/s100529900208
Study of
decays involving kaons, spectral functions
and determination of the strange quark mass
The ALEPH Collaboration
R. Barate - et al.
Laboratoire de Physique des Particules (LAPP), IN2P3-CNRS,
74019 Annecy-le-Vieux Cedex, France
Received: 24 February 1999 / Published online: 14 October 1999
Abstract
All ALEPH measurements of branching ratios of
decays involving kaons
are summarized including a combination of results obtained with
K0S and K0L detection. The decay dynamics are studied, leading to
the determination of contributions from vector
K*(892) and
K*(1410),
and axial-vector K1(1270) and K1(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
mode is compared
with the corresponding cross section for low energy e+e- 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 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
MeV/c2. The evolution down to
1 GeV gives
.
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