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Full-Text Articles in Physics
Evidence For Isospin Violation And Measurement Of C P Asymmetries In B → K ∗ ( 892 ) Γ, T. Horiguchi Et Al., D. Joffe, Ratnappuli L. Kulasiri
Evidence For Isospin Violation And Measurement Of C P Asymmetries In B → K ∗ ( 892 ) Γ, T. Horiguchi Et Al., D. Joffe, Ratnappuli L. Kulasiri
Faculty and Research Publications
We report the first evidence for isospin violation in B→K∗γ and the first measurement of the difference of CP asymmetries between B+→K*+γ and B0→K*0γ. This analysis is based on the data sample containing 772×106B¯B pairs that was collected with the Belle detector at the KEKB energy-asymmetric e+e− collider. We find evidence for the isospin violation with a significance of 3.1σ, Δ0+=[+6.2±1.5(stat)±0.6(syst)±1.2(f+−/f00)]%, where the third uncertainty is due to the uncertainty on the fraction of B+B− to B0¯B0 production in Υ(4S) decays. The measured value is consistent with predictions of the standard model. The result for the difference of CP asymmetries …
Measurement Of The Decays B → Η ℓ Ν ℓ And B → Η ′ ℓ Ν ℓ In Fully Reconstructed Events At Belle, C. Beleño Et Al., D. Joffe, Ratnappuli L. Kulasiri
Measurement Of The Decays B → Η ℓ Ν ℓ And B → Η ′ ℓ Ν ℓ In Fully Reconstructed Events At Belle, C. Beleño Et Al., D. Joffe, Ratnappuli L. Kulasiri
Faculty and Research Publications
We report branching fraction measurements of the decays B+→ηℓ+νℓ and B+→η′ℓ+νℓ based on 711 fb−1 of data collected near the Υ(4S) resonance with the Belle experiment at the KEKB asymmetric-energy e+e− collider. This data sample contains 772 million B¯B events. One of the two Bmesons is fully reconstructed in a hadronic decay mode. Among the remaining (“signal-B”) daughters, we search for the η meson in two decay channels, η→γγ and η→π+π−π0, and reconstruct the η′meson in η′→ηπ+π− with subsequent decay of the η into γγ. Combining the two η modes and using an extended maximum likelihood, the B+→ηℓ+νℓ branching fraction …
Lepton-Flavor-Dependent Angular Analysis Of B→K^{*}ℓ^{+}ℓ^{-}, S. Wehle Et Al., D. Joffe, Ratnappuli L. Kulasiri
Lepton-Flavor-Dependent Angular Analysis Of B→K^{*}ℓ^{+}ℓ^{-}, S. Wehle Et Al., D. Joffe, Ratnappuli L. Kulasiri
Faculty and Research Publications
We present a measurement of angular observables and a test of lepton flavor universality in the B → K∗ ` +` − decay, where ` is either e or µ. The analysis is performed on a data sample corresponding to an integrated luminosity of 711 fb−1 containing 772 × 106 BB¯ pairs, collected at the Υ(4S) resonance with the Belle detector at the asymmetric-energy e +e − collider KEKB. The result is consistent with Standard Model (SM) expectations, where the largest discrepancy from a SM prediction is observed in the muon modes with a local significance of 2.6σ.
Observation Of D^{0}→Ρ^{0}Γ And Search For Cp Violation In Radiative Charm Decays, T. Nanut Et Al., D. Joffee, Ratnappuli L. Kulasiri
Observation Of D^{0}→Ρ^{0}Γ And Search For Cp Violation In Radiative Charm Decays, T. Nanut Et Al., D. Joffee, Ratnappuli L. Kulasiri
Faculty and Research Publications
We report the first observation of the radiative charm decay D0→ρ0γ and the first search for CP violation in decays D0→ρ0γ, ϕγ, and ¯K*0(892)γ, using a data sample of 943 fb−1 collected with the Belle detector at the KEKB asymmetric-energy e+e− collider. The branching fraction is measured to be B(D0→ρ0γ)=(1.77±0.30±0.07)×10−5, where the first uncertainty is statistical and the second is systematic. The obtained CP asymmetries ACP(D0→ρ0γ)=+0.056±0.152±0.006, ACP(D0→ϕγ)=−0.094±0.066±0.001, and ACP(D0→¯K*0γ)=−0.003±0.020±0.000 are consistent with no CP violation. We also present an improved measurement of the branching fractions B(D0→ϕγ)=(2.76±0.19±0.10)×10−5 and B(D0→¯K*0γ)=(4.66±0.21±0.21)×10−4.