Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 4 of 4
Full-Text Articles in Physics
Observation Of Y(4s)→N′Y(1s), Belle Collaboration, Ratnappuli Luminda Kulasiri
Observation Of Y(4s)→N′Y(1s), Belle Collaboration, Ratnappuli Luminda Kulasiri
Faculty and Research Publications
We report the first observation of the hadronic transition Υ(4S)→η′Υ(1S), using 496 fb−1 data collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e−collider. We reconstruct the η′ meson through its decays to ρ0γ and to π+π−η, with η→γγ. We measure B(Υ(4S)→η′Υ(1S))=[3.43±0.88(stat)±0.21(syst)]×10−5, with a significance of 5.7σ.
Measurement Of Branching Fractions Of Hadronic Decays Of The Ω 0 C Baryon, J. Yelton Et Al., D. Joffe, Ratnappuli L. Kulasiri
Measurement Of Branching Fractions Of Hadronic Decays Of The Ω 0 C Baryon, J. Yelton Et Al., D. Joffe, Ratnappuli L. Kulasiri
Faculty and Research Publications
Using a data sample of 980 fb−1 of e+e− annihilation data taken with the Belle detector operating at the KEKB asymmetric-energy e+e− collider, we report the results of a study of the decays of the Ω0ccharmed baryon into hadronic final states. We report the most precise measurements to date of the relative branching fractions of the Ω0c into Ω−π+π0, Ω−π+π−π+, Ξ−K−π+π+, and Ξ0K−π+, as well as the first measurements of the branching fractions of the Ω0c into Ξ−¯K0π+, Ξ0¯K0, and Λ¯K0¯K0, all with respect to the Ω−π+ decay. In addition, we investigate the resonant substructure of these modes. Finally, we …
Search For C P Violation In The D + → Π + Π 0 Decay At Belle, V. Babu Et Al., D. Joffe, Ratnappuli L. Kulasiri
Search For C P Violation In The D + → Π + Π 0 Decay At Belle, V. Babu Et Al., D. Joffe, Ratnappuli L. Kulasiri
Faculty and Research Publications
We search for CP violation in the charged charm meson decay D+→π+π0, based on a data sample corresponding to an integrated luminosity of 921 fb−1 collected by the Belle experiment at the KEKB e+e− asymmetric-energy collider. The measured CP-violating asymmetry is [+2.31±1.24(stat)±0.23(syst)]%, which is consistent with the standard model prediction and has a significantly improved precision compared to previous results.
Measurements Of The Absolute Branching Fractions Of B + → X C ¯ C K + And B + → ¯ D ( * ) 0 Π + At Belle, Y. Kato Et Al., Ratnappuli L. Kulasiri
Measurements Of The Absolute Branching Fractions Of B + → X C ¯ C K + And B + → ¯ D ( * ) 0 Π + At Belle, Y. Kato Et Al., Ratnappuli L. Kulasiri
Faculty and Research Publications
We present the measurement of the absolute branching fractions of B+→Xc¯cK+ and B+→¯D(*)0π+decays, using a data sample of 772×106 B¯B pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. Here, Xc¯c denotes ηc, J/ψ, χc0, χc1, ηc(2S), ψ(2S), ψ(3770), X(3872), and X(3915). We do not observe significant signals for X(3872) or X(3915) and set the 90% confidence level upper limits at B(B+→X(3872)K+)<2.6×10−4 and B(B+→X(3915)K+)<2.8×10−4. These represent the most stringent upper limit for B(B+→X(3872)K+) to date and the first limit for B(B+→X(3915)K+). The measured branching fractions for ηc and ηc(2S) are the most precise to date, B(B+→ηcK+)=(12.0±0.8±0.7)×10−4and B(B+→ηc(2S)K+)=(4.8±1.1±0.3)×10−4, where the first and second uncertainties are statistical and systematic, respectively.