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Full-Text Articles in Physics
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.
Inclusive And Exclusive Measurements Of B Decays To Χ_{C1} And Χ_{C2} At Belle, V. Bhardwaj Et Al., D. Joffe
Inclusive And Exclusive Measurements Of B Decays To Χ_{C1} And Χ_{C2} At Belle, V. Bhardwaj Et Al., D. Joffe
Faculty and Research Publications
We report inclusive and exclusive measurements for χc1 and χc2 production in B decays. We measure B(B → χc1X)= (3.03 ± 0.05(stat) ± 0.24(syst)) × 10−3 and B(B → χc2X)= (0.70 ± 0.06(stat) ± 0.10(syst)) × 10−3 . For the first time, χc2 production in exclusive B decays in the modes B 0 → χc2π −K+ and B + → χc2π +π −K+ has been observed, along with first evidence for the B + → χc2π +K0 S decay mode. For χc1 production, we report the first observation in the B + → χc1π +π −K+, B 0 → χc1π …
Measurement Of The Decay B→Dℓν_{ℓ} In Fully Reconstructed Events And Determination Of The Cabibbo-Kobayashi-Maskawa Matrix Element |V_{Cb}|, R. Glattauer Et Al., D. Joffe
Measurement Of The Decay B→Dℓν_{ℓ} In Fully Reconstructed Events And Determination Of The Cabibbo-Kobayashi-Maskawa Matrix Element |V_{Cb}|, R. Glattauer Et Al., D. Joffe
Faculty and Research Publications
We present a determination of the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| using the decay B→Dℓνℓ (ℓ=e,μ) based on 711 fb−1 of e+e−→Υ(4S) data recorded by the Belle detector and containing 772×106 B¯B pairs. One B meson in the event is fully reconstructed in a hadronic decay mode, while the other, on the signal side, is partially reconstructed from a charged lepton and either a D+ or D0 meson in a total of 23 hadronic decay modes. The isospin-averaged branching fraction of the decay B→Dℓνℓ is found to be B(B0→D−ℓ+νℓ)=(2.31±0.03(stat)±0.11(syst))%. Analyzing the differential decay rate as a function of …
First Observation Of The Decay B 0 → Ψ ( 2 S ) Π 0, V. Chobanova Et Al., D. Joffe
First Observation Of The Decay B 0 → Ψ ( 2 S ) Π 0, V. Chobanova Et Al., D. Joffe
Faculty and Research Publications
We report a measurement of the B 0 → ψ(2S)π 0 branching fraction based on the full Υ(4S) data set of 772 × 106 BB¯ pairs collected by the Belle detector at the KEKB asymmetric-energy e +e − collider. We obtain B(B 0 → ψ(2S)π 0 ) = (1.17 ± 0.17(stat) ± 0.08(syst)) × 10−5 . The result has a significance of 7.2 standard deviations and is the first observation of the decay B 0 → ψ(2S)π 0.