We report the measurement of branching fractions and \(CP\)-violation asymmetries in \(B\to \phi \phi K\) decays based on a \(711\,{\rm fb}^{-1}\) data sample containing \(772\times 10^6\) ...\(B\bar{B}\) events. The data were recorded at the \(\Upsilon (4S)\) resonance with the Belle detector at the KEKB asymmetric-energy \(e^+ e^-\) collider. For \(B^+ \to \phi \phi K^+\), the branching fraction and \(CP\)-violation asymmetry measured below the \(\eta_{c}\) threshold (\(m_{\phi\phi}<2.85\,{\rm GeV}/c^2\)) are \(3.43^{\,+\,0.48}_{\,-\,0.46}({\rm stat})\pm 0.22({\rm syst}) \times10^{-6}\) and \(-0.02\pm0.11({\rm stat})\pm0.01({\rm syst})\), respectively. Similarly, the branching fraction obtained for \(B^0 \to\phi\phi K^0\) below the \(\eta_{c}\) threshold is \(3.02^{\,+\,0.75}_{\,-\,0.66} ({\rm stat})\pm \,0.20({\rm syst})\times10^{-6}\). We also measure the \(CP\)-violation asymmetry for \(B^+ \to\phi\phi K^+\) within the \(\eta_{c}\) region (\(m_{\phi\phi}\in 2.94,3.02\,{\rm GeV}/c^2\)) to be \(+0.12\pm0.12({\rm stat})\pm0.01({\rm syst})\).
Here we observe evidence for CP violation in the decay D+→K$0\atop{S}$π+ using a data sample with an integrated luminosity of 977 fb-1 collected by the Belle detector at the KEKB e+e- ...asymmetric-energy collider. The CP asymmetry in the decay is measured to be (-0.363±0.094±0.067)%, which is 3.2 standard deviations away from zero, and is consistent with the expected CP violation due to the neutral kaon in the final state.
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CMK, CTK, FMFMET, IJS, NUK, PNG, UM
We report results of a search for narrow resonances in e super(+e) super(-) annihilation at center-of-mass energies between 1.85 and 3.1 GeV performed with the KEDR detector at the VEPP-4M e ...super(+e) super(-) collider. The upper limit on the leptonic width of a narrow resonance inline image has been obtained (at 90% C.L.).
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
We report measurements of partial branching fractions of inclusive charmless semileptonic B-meson decays at the endpoint of the electron momentum spectrum. The measurements are made in six ...overlapping momentum intervals that have lower bounds ranging from 1.9 to 2.4 GeV/c and a common upper bound of 2.6 GeV/c, as measured in the centre of mass frame. The results are based on a sample of 29 million BB¯ pairs, accumulated by the Belle detector at the KEKB asymmetric e+e− collider operating on the ϒ(4S) resonance. In the momentum interval ranging from 1.9 to 2.6 GeV/c we measure the partial branching fraction ΔB(B→Xueνe)=(8.47±0.37±1.53)×10−4, where the first error is statistical and the second is systematic. A prediction of the partial rate R=(21.69±3.62−1.98+2.18)|Vub|2 ps−1 in this momentum interval based on theory is calculated with input HQET parameters that have been derived from Belle's measurement of the B→Xsγ photon energy spectrum, where the first error is due to the uncertainty on HQET parameters and the second error is from theory. Using both ΔB(B→Xueνe) and R we find |Vub|=(5.08±0.47±0.42−0.23+0.26)×10−3, where the first error is from the partial branching fraction, and the second and third errors are from uncertainties in R.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
Phys. Rev. D 94, 112001 (2016) We analyze a 37 pb$^{-1}$ data sample collected with the SND detector at the
VEPP-2000 $e^+e^-$ collider in the center-of-mass energy range 1.05--2.00 GeV
and present ...an updated measurement of the $e^+e^- \to \omega \pi^0 \to
\pi^0\pi^0\gamma$ cross section. In particular, we correct the mistake in
radiative correction calculation made in our previous measurement based on a
part of the data. The measured cross section is fitted with the vector meson
dominance model with three $\rho$-like states and used to test the conserved
vector current hypothesis in the $\tau^-\to\omega\pi^-\nu_{\tau}$ decay.
An algorithm for computing the amplitudes and timing signals with continuous sampling in a multichannel calorimeter for high-energy physics is proposed. The structure of the developed hardware for ...implementation of this algorithm and the results of testing of production samples of electronic modules are presented.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The reaction pd→He3η at threshold was used to provide a clean source of η mesons for decay studies with the WASA detector at CELSIUS. The branching ratio of the decay η→π+π−e+e− is measured to be ...(4.3±1.3±0.4)×10−4.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
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