منابع مشابه
Observation of the rare decay KS → π 0 e + e −
A search for the decay KS → π0e+e− has been made by the NA48/1 experiment at the CERN SPS accelerator. Using data collected during 89 days in 2002 with a high-intensity KS beam, 7 events were found with a background of 0.15 events. The branching fraction BR(KS → π0e+e−, mee > 0.165 GeV/c2) = (3.0 −1.2(stat) ± 0.2(syst)) × 10−9 has been measured. Using a vector matrix element and a form factor e...
متن کاملSearch for the KS → 3π0 decay with the KLOE detector
The KS → 3π0 decay is a pure CP violating process which, assuming CPT invariance, gives access to the CP – violating phase of the weak decay amplitude into I=1 final states. This decay has not been observed so far, and the best upper limit on the branching ratio BR(KS → 3π0) < 1.2 · 10−7 is two orders of magnitude larger than predictions based on the Standard Model. In this article we present t...
متن کامل+ 2γ at Slc/lep Energies *
We use the spinor methods of the CALKUL collaboration, as realized by Xu, Zhang and Chang, to calculate the differential cross section for e + e − → e + e − + 2γ for c.m.s. energies in the SLC/LEP regime. An explicit complete formula for the respective cross section is obtained. The leading log approximation is used to check the formula. Applications of the formula to high precision luminosity ...
متن کاملMeasurement of Br(Ks -> pi+pi-pi0) and limit on the CP violating decay Br(Ks -> 3pi0)
The NA48/1 Collaboration has measured the amplitude of the CP-conserving component of the decay K0 S → π+π−π0 relative to K0 L → π+π−π0 using data taken in 2002. The amplitude has been calculated by measuring the parameter λ which describes the interference between the KL and KS decays. From a fit to 19 million reconstructed K0/K̄0 → π+π−π0 events the values Re(λ ) = 0.038±0.010 and Im(λ ) = −0....
متن کاملOn Fuzzy KS-Semigroups
In this paper ,we fuzzify the new class of algebraic structure introduced by Kim[5].In this fuzzification(called fuzzy KS-semigroups),we introduce the notions of fuzzy sub KS-semigroups,fuzzy KS-ideal,fuzzy KS-p-ideal and investigate some of their related properties.The purpose of this study is to implement the fuzzy set theory and ideal theory in the KS-semigroups.This fuzzification leads to d...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1972
ISSN: 0033-068X
DOI: 10.1143/ptp.48.261