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691.
The NEMO-2 prototype, built for background measurements and located in the Fréjus Underground Laboratory (4800 m w.e.) has provided results with three ββ decay sources, 100Mo, 116Cd and 82Se with data accumulated over a total of 23000 h. Final results of ββ2ν half-lives measurements and limits on 0ν modes are given here. The NEMO-3 detector which will be able to accomodate sources of 10 kg is now under construction. The aim of the experiment is to reach a half-life measurement of 1025y for ββ0ν decay, which corresponds to a Majorana neutrino mass of 0.1 eV for 100Mo. 相似文献
692.
DELPHI Collaboration P. Abreu et al. 《The European Physical Journal C - Particles and Fields》1999,6(3):385-401
Data taken by DELPHI during the 1995 and 1996 LEP runs have been used to search for the supersymmetric partners of electron,
muon and tau leptons and of top and bottom quarks. The observations are in agreement with standard model predictions. Limits
are set on sfermion masses. Searches for long lived scalar leptons from low scale supersymmetry breaking models exclude stau
masses below 55 GeV/c at the 95% confidence level, irrespective of the gravitino mass.
Received: 13 July 1998 / Published online: 19 November 1998 相似文献
693.
BES Collaboration 《中国物理C(英文版)》1998,22(2):97-105
The channels of J/ψ decay into,ΛΛ,ΛΛγ and ΛΛπ0 are analyzed with 7.8×106 J/ψ events collected by BES detector at BEPC Collider.The branching ratios for three channels and the angular distribution for the first channel are measured.The branching ratios are Br(J/ψ→ΛΛ)=(l.08±0.06±0.24)×10-3,Br(J/ψ→ΛΛγ)-4(90% CL)and Br(J/ψ→ΛΛπ0)=(2.3±0.7±0.8)×l0-4 respectively. The angular distribution for J/ψ→ΛΛ is dN dcosθ=N0(1+αcos20),α=0.52±0.33±0.13. 相似文献
694.
BES Collaboration 《中国物理C(英文版)》1995,19(1):93-96
The hadronic decays ,and ωf2(1270) have been studied in a sample of 1.27 million produced.Measurements of their branching fractions are presented. While obeys the "14% rule" predicted by theory, →ωf2 (1270) is suppressed comparing with the corresponding decay. As a vector-tensor pair combination, the ωf2 mode is the first example of a non-vector-pseudoscalar decay of charmonium which violates the above mentioned rule. 相似文献
695.
BES Collaboration 《中国物理C(英文版)》1995,19(8):673-685
The cross sections of e+e-→hadrons,e+e-,μ+μ-have been measured in the vicinity of J/ψresonance at BES/BEPC.The fit of the observed cross sections gives the new results of J/ψ resonance parameters:the partial widths to hadrons,electrons and muous are Γh=74.1±8.1keV,Γe= 5.14±0.39keV and Γμ=5.13±0.52keV respectively;the total width Γ=84.4±8.9keV;the branching fractions Γh/Γ=(87.8±0.5)%,Γe/Γ=(6.09± 0.33)%,and Γμ/Γ=(6.08±0.33) %. 相似文献