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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 …
Search For Cp Violation And Measurement Of The Branching Fraction In The Decay D0 → K0 Sk0 S, N. Dash Et Al., D. Joffe, Ratnappuli L. Kulasiri
Search For Cp Violation And Measurement Of The Branching Fraction In The Decay D0 → K0 Sk0 S, N. Dash Et Al., D. Joffe, Ratnappuli L. Kulasiri
Faculty and Research Publications
We report a study of the decay D0→K0SK0S using 921 fb−1 of data collected at or near the Υ(4S) and Υ(5S) resonances with the Belle detector at the KEKB asymmetric energy e+e− collider. The measured time-integrated CP asymmetry is ACP(D0→K0SK0S)=(−0.02±1.53±0.02±0.17)%, and the branching fraction is B(D0→K0SK0S)=(1.321±0.023±0.036±0.044)×10−4, where the first uncertainty is statistical, the second is systematic, and the third is due to the normalization mode (D0→K0Sπ0). These results are significantly more precise than previous measurements available for this mode. The ACP measurement is consistent with the standard model expectation.
Invariant-Mass And Fractional-Energy Dependence Of Inclusive Production Of Dihadrons In E + E − Annihilation At √ S = 10.58 Gev, R. Seidl Et Al., D. Joffe, Ratnappuli L. Kulasiri
Invariant-Mass And Fractional-Energy Dependence Of Inclusive Production Of Dihadrons In E + E − Annihilation At √ S = 10.58 Gev, R. Seidl Et Al., D. Joffe, Ratnappuli L. Kulasiri
Faculty and Research Publications
The inclusive cross sections for dihadrons of charged pions and kaons (e+e−→hhX) in electron-positron annihilation are reported. They are obtained as a function of the total fractional energy and invariant mass for any di-hadron combination in the same hemisphere as defined by the thrust event-shape variable and its axis. Since same-hemisphere dihadrons can be assumed to originate predominantly from the same initial parton, di-hadron fragmentation functions are probed. These di-hadron fragmentation functions are needed as an unpolarized baseline in order to quantitatively understand related spin-dependent measurements in other processes and to apply them to the extraction of quark transversity distribution …
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.