arXiv subjects

V. A. Uvarov

Publications and source records attributed to V. A. Uvarov.

21 records · Page 2Linked to original sources

arXiv2003

Measurement of the Dalitz plot slope parameters for K- -> pi0 pi0 pi- decay using ISTRA+ detector

The Dalitz plot slope parameters g, h and k for the K- -> pi0 pi0 pi- decay have been measured using in-flight decays detected with the ISTRA+ setup operating in the 25 GeV negative secondary beam of the U-70 PS. About 252 K events with four-momenta measured for the pi- and four involved photons were used for the analysis. The values obtained g=0.627+/-0.004(stat)+/-0.010(syst), h=0.046+/-0.004(stat)+/-0.012(syst), k=0.001+/-0.001(stat)+/-0.002(syst) are consistent with the world averages dominated by K+ data, but have significantly smaller errors.

hep-ex↗

arXiv2002

Study of charge multiplicity in hadronic three-jet Z decays at LEP

The mean charge multiplicity in hadronic three-jet Z decays has been measured with the DELPHI detector as a function of the event topology and compared with recent theoretical calculations. The QCD colour factor ratio C_A/C_F was determined, and the gluon contribution to this multiplicity was extracted giving a measurement of the mean charge multiplicity of a two-gluon colour-singlet system as a function of the effective c.m. energy covering the range from 16 to 52 GeV.

hep-ex↗

arXiv2001

Determination of the strangeness content of light-flavour isoscalars from their production rates in hadronic Z decays at LEP

A new phenomenological approach is suggested for determining the strangeness content of light-flavour isoscalars. This approach is based on phenomenological laws of hadron production related to the spin, isospin, strangeness content and mass of the particles. From the total production rates per hadronic Z decay of all light-flavour hadrons, measured so far at LEP, the values of the nonstrange-strange mixing angles are found to be |ϕ_P| = 42.3^{\circ} \pm 3.5^{\circ}, |ϕ_V| = 10^{\circ} \pm 8^{\circ}, |ϕ_T| = 16^{\circ} \pm 11^{\circ} and |ϕ_S| = 13^{\circ} \pm 9^{\circ}. Our results on the η-η^{\prime}, ω-ϕand f_2-f_2^{\prime} isoscalar mixing are consistent with the present experimental evidence. The strangeness content obtained for the f_0(980) scalar/isoscalar is not consistent with the values supported by recent model studies and is discussed further in the framework of our approach and the K-matrix analysis.

hep-ex↗