Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 9 of 9
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.
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.
Measurement Of Branching Fraction And Direct Cp Asymmetry In Charmless B+ → K+K−Π + Decays At Belle, C.-L. Hsu Et Al., D. Joffe, Ratnappuli L. Kulasiri
Measurement Of Branching Fraction And Direct Cp Asymmetry In Charmless B+ → K+K−Π + Decays At Belle, C.-L. Hsu Et Al., D. Joffe, Ratnappuli L. Kulasiri
Faculty and Research Publications
We report a study of the charmless hadronic decay of the charged B meson to the three-body final state K+K−π+. The results are based on a data sample that contains 772×106 B¯B pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. The measured inclusive branching fraction and direct CP asymmetry are (5.38±0.40±0.35)×10−6 and −0.170±0.073±0.017, respectively, where the first uncertainties are statistical and the second are systematic. The K+K− invariant mass distribution of the signal candidates shows an excess in the region below 1.5 GeV/c2, which is consistent with the previous studies from BABAR …
First Measurement Of T-Odd Moments In D^{0}→K_{S}^{0}Π^{+}Π^{-}Π^{0} Decays, K. Pransanth Et Al., D. Joffe, Ratnappuli L. Kulasiri
First Measurement Of T-Odd Moments In D^{0}→K_{S}^{0}Π^{+}Π^{-}Π^{0} Decays, K. Pransanth Et Al., D. Joffe, Ratnappuli L. Kulasiri
Faculty and Research Publications
We report the first measurement of the T-odd moments in the decay D0→K0Sπ+π−π0 from a data sample corresponding to an integrated luminosity of 966 fb−1 collected by the Belle experiment at the KEKB asymmetric-energy e+e− collider. From these moments we determine the CP-violation-sensitive asymmetry aT-oddCP=[−0.28±1.38(stat.)+0.23−0.76(syst.)]×10−3, which is consistent with no CP violation. In addition, we perform aT−oddCP measurements in different regions of the D0→K0Sπ+π−π0 phase space; these are also consistent with no CP violation.
Search For The 0^{--} Glueball In ϒ(1s) And ϒ(2s) Decays, S. Jia Et Al., D. Joffe, Ratnappuli L. Kulasiri
Search For The 0^{--} Glueball In ϒ(1s) And ϒ(2s) Decays, S. Jia Et Al., D. Joffe, Ratnappuli L. Kulasiri
Faculty and Research Publications
We report the first search for the J P C = 0−− glueball in Υ(1S) and Υ(2S) decays with data samples of (102 ± 2) million and (158 ± 4) million events, respectively, collected with the Belle detector. No significant signals are observed in any of the proposed production modes, and the 90% credibility level upper limits on their branching fractions in Υ(1S) and Υ(2S) decays are obtained. The inclusive branching fractions of the Υ(1S) and Υ(2S) decays into final states with a χc1 are measured to be B(Υ(1S) → χc1 + anything) = (1.90 ± 0.43(stat.) ± 0.14(syst.)) × …
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 …