Dispersive treatment of $$K_S\rightarrow \gamma \gamma $$ K S → γ γ and $$K_S\rightarrow \gamma \ell ^+\ell ^-$$ K S → γ ℓ + ℓ -
نویسندگان
چکیده
منابع مشابه
Measurement of Γ ( K S → π + π − ( γ ) ) / Γ ( K S → π 0 π 0 )
We have measured the ratio R S = Γ(KS → π π(γ))/Γ(KS → π π) with the KLOE detector at the DAΦNE ee collider. This measurement is fully inclusive with respect to the ππγ final state. The sample of over 10 two-pion decays of tagged KS mesons allows a statistical error as low as ∼ 0.1% to be obtained. The accuracy is limited by systematic uncertainties, which are estimated primarily from data. We ...
متن کاملPrecise measurement of Γ ( K → eν ( γ ) ) / Γ ( K → μ ν ( γ ) ) and study of K →
We present a precise measurement of the ratio RK = Γ(K → eν(γ))/Γ(K → μν(γ)) and a study of the radiative process K → eνγ, performed with the KLOE detector. The results are based on data collected at the Frascati ee collider DAΦNE for an integrated luminosity of 2.2 fb. We find RK = (2.493 ± 0.025stat ± 0.019syst) × 10 , in agreement with the Standard Model expectation. This result is used to i...
متن کاملRethinking $(k,\ell)$-anonymity in social graphs: $(k,\ell)$-adjacency anonymity and $(k,\ell)$-(adjacency) anonymous transformations
This paper treats the privacy-preserving publication of social graphs in the presence of active adversaries, that is, adversaries with the ability to introduce sybil nodes in the graph prior to publication and leverage them to create unique fingerprints for a set of victim nodes and re-identify them after publication. Stemming from the notion of (k, l)-anonymity, we introduce (k, l)-anonymous t...
متن کامل2 00 2 CP - violation in K S , L → π + π − γ and K S , L → π + π − e + e − decays
The dependence of KS,L → ππγ decay probabilities on photon polarization is calculated. The phases of terms of amplitude that arise from the pion-pion interaction are obtained by using a simple realistic model of pion-pion interaction via virtual ρ-meson, instead of the ChPT. The results are compared with those of other authors and the origin of the discrepancies is explained. It is shown that t...
متن کاملReanalysis of CP Violation in K L → π + π − γ
We present a reanalysis of direct CP violation in the decay K L → π + π − γ. We point out an existing discrepancy between the theoretical and experimental definitions of ǫ ′ +−γ. Adopting the experimental definition of ǫ ′ +−γ , we estimate that ǫ ′ +−γ /ǫ could be as large as a few times 10 −4 both within the standard model and beyond. We discuss these estimates in detail and we also show how ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 2016
ISSN: 1434-6044,1434-6052
DOI: 10.1140/epjc/s10052-016-4449-2