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Creators/Authors contains: "Chekelian, V"

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  1. A<sc>bstract</sc> We report a search for the charged-lepton flavor violation in Υ(2S) →ℓτ±(ℓ=e, μ) decays using a 25 fb−1Υ(2S) sample collected by the Belle detector at the KEKBe+easymmetric-energy collider. We find no evidence for a signal and set upper limits on the branching fractions ($$ \mathcal{B} $$ B ) at 90% confidence level. We obtain the most stringent upper limits:$$ \mathcal{B} $$ B (Υ(2S)→ μτ±)<0.23×10−6and$$ \mathcal{B} $$ B (Υ(2S)→ eτ±)<1.12×10−6
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  2. A<sc>bstract</sc> We present the analysis of two-particle angular correlations using coordinate systems defined with the conventional beam axis and the event thrust axis. We propose the latter as a good representation for the correlation structure interpretation in thee+ecollision system. Thee+ecollisions to hadronic final states at center-of-mass energies of$$ \sqrt{s} $$ s = 10.52 GeV and 10.58 GeV are recorded by the Belle detector at KEKB. In this paper, results on the first dataset are supplementary to the previous Belle publication [1]. At the same time, the latter is the first two-particle correlation measurement at collision energy on theΥ(4S) resonance and is sensitive to its decay products. Measurements are reported as a function of the charged-particle multiplicity. Finally, a qualitative understanding of the correlation structure is discussed using a combination of Monte Carlo simulations and experimental data. 
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