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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.
Search For Υ ( 1 S , 2 S ) → Z + C Z ( ' ) C − And E + E − → Z + C Z ( ' ) C − At √ S = 10.52 , 10.58, And 10.867 Gev, S. Jia Et Al., Ratnappuli L. Kulasiri
Search For Υ ( 1 S , 2 S ) → Z + C Z ( ' ) C − And E + E − → Z + C Z ( ' ) C − At √ S = 10.52 , 10.58, And 10.867 Gev, S. Jia Et Al., Ratnappuli L. Kulasiri
Faculty and Research Publications
The first search for double charged charmoniumlike state production in Υ(1S) and Υ(2S) decays and in e+e− annihilation at √s=10.52, 10.58, and 10.867 GeV is conducted using data collected with the Belle detector at the KEKB asymmetric energy electron-positron collider. No significant signals are observed in any of the studied modes, and the 90% credibility level upper limits on their product branching fractions in Υ(1S) and Υ(2S) decays [B(Υ(1S,2S)→Z+cZ(')−c)×B(Z+c→π++c¯c) (c¯c=J/ψ, χc1(1P), ψ(2S))] and the product of Born cross section and branching fraction for e+e−→Z+cZ(')−c (σ(e+e−→Z+cZ(')−c)×B(Z+c→π++c¯c)) at √s=10.52, 10.58, and 10.867 GeV are determined. Here, Zc refers to the Zc(3900) and …
Angular Analysis Of The E + E − → Dðþd∓ Process Near The Open Charm Threshold Using Initial-State Radiation, V. Zhukova Et Al., Ratnappuli L. Kulasiri
Angular Analysis Of The E + E − → Dðþd∓ Process Near The Open Charm Threshold Using Initial-State Radiation, V. Zhukova Et Al., Ratnappuli L. Kulasiri
Faculty and Research Publications
We report a new measurement of the exclusive e+e−→D(*)±D*∓ cross sections as a function of the center-of-mass energy from the D(*)±D*∓ threshold through √s=6.0 GeV, using the initial-state radiation technique. The analysis is based on a data sample collected with the Belle detector with an integrated luminosity of 951 fb−1. The accuracy of the cross section measurement is increased by a factor of 2 over the first Belle study. We perform the first angular analysis of the e+e−→D*±D*∓process and decompose this exclusive cross section into three components corresponding to the D∗helicities.
Observation Of An Alternative Χ_{C0}(2p) Candidate In E^{+}E^{-}→J/Ψdd[Over ¯], K. Chilikin Et Al., D. Joffe, Ratnappuli L. Kulasiri
Observation Of An Alternative Χ_{C0}(2p) Candidate In E^{+}E^{-}→J/Ψdd[Over ¯], K. Chilikin Et Al., D. Joffe, Ratnappuli L. Kulasiri
Faculty and Research Publications
We perform a full amplitude analysis of the process e+e−→J/ψD¯D, where D refers to either D0 or D+. A new charmoniumlike state X∗(3860) that decays to D¯D is observed with a significance of 6.5σ. Its mass is (3862+26−32 +40−13) MeV/c2, and its width is (201+154−67 +88−82) MeV. The JPC=0++ hypothesis is favored over the 2++ hypothesis at the level of 2.5σ. The analysis is based on the 980 fb−1 data sample collected by the Belle detector at the asymmetric-energy e+e− collider KEKB.
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 …