Measurements of inclusive differential cross sections for charged pion and kaon production in e⁺e⁻ annihilation have been carried out at a center-of-mass energy of √s=10.52 GeV. The measurements were ...performed with the Belle detector at the KEKB e⁺e⁻ collider using a data sample containing 113×106 e⁺e⁻→qq¯ events, where q={u,d,s,c}. We present charge-integrated differential cross sections dσh±/dz for h±={π±,K±} as a function of the relative hadron energy z=2Eh/√s from 0.2 to 0.98. The combined statistical and systematic uncertainties for π± (K±) are 4% (4%) at z~0.6 and 15% (24%) at z~0.9. The cross sections are the first measurements of the z dependence of pion and kaon production for z>0.7 as well as the first precision cross section measurements at a center-of-mass energy far below the Z⁰ resonance used by the experiments at LEP and SLC.
Measurements of inclusive differential cross sections for charged pion and kaon production in e+e- annihilation have been carried out at a center-of-mass energy of s=10.52 GeV . The measurements were ...performed with the Belle detector at the KEKB e+e- collider using a data sample containing 113×106 e+e-→q q¯ events, where q= { u,d,s,c } . We present charge-integrated differential cross sections dσh±/dz for h±= { π±,K± } as a function of the relative hadron energy z=2Eh/s from 0.2 to 0.98. The combined statistical and systematic uncertainties for π± ( K± ) are 4% (4%) at z~0.6 and 15% (24%) at z~0.9 . The cross sections are the first measurements of the z dependence of pion and kaon production for z>0.7 as well as the first precision cross section measurements at a center-of-mass energy far below the Z0 resonance used by the experiments at LEP and SLC.
Evidence for B¯s0→Λc+Λ¯π Adachi, I.; Asner, D. M.; Aushev, T. ...
Physics letters. B,
08/2013, Letnik:
726, Številka:
1-3
Journal Article
Recenzirano
Odprti dostop
Using 121.4 fb–1 of data collected with the Belle detector at the Y(5S) resonance at the KEKB asymmetric-energy e+e- collider, we report evidence for the B¯$^{0}_{s}$ → Λ$^{+}_{c}$Λ¯π– decay mode ...with a measured branching fraction (3.6 ± 1.1stat.$^{+0.3}_{-0.5}$syst. ± 0.9Λ$^{+}_{c}$ ± 0.7 NB¯$^{0}_{s}$) x 10–4 and a significance of 4.4 standard deviations. Here, this is the first evidence for a baryonic B$^{0}_{s}$ decay.
We present a measurement of the branching fractions and charge-parity-(CP-)violating parameters in B arrow right omega K decays. The results are obtained from the final data sample containing 772x106 ...BB super(-) pairs collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain the branching fractions B(BO arrow right omega KO)=(4.5+ or -0.4(stat)+ or -0.3(syst))x10-6,B(B+ arrow right omega K+)= (6.8+ or -0.4(stat)+ or -0.4(syst))x10-6 which are in agreement with their respective current world averages. For the CP-violating parameters, we obtain A omega KSO=-0.36+ or -0.19(stat) + or -0.05(syst),S omega KSO=+0.91+ or -0.32(stat)+ or -0.05(syst)A omega K+=-0.03+ or -0.04(stat)+ or -0.01(syst), where A and S represent the direct and mixing-induced CP asymmetry, respectively. We find no evidence of CP violation in the decay channel B+ arrow right omega K+; however, we obtain the first evidence of CP violation in the BO arrow right omega KSO decay channel at the level of 3.1 standard deviations.
We report the results of a high-statistics search for H-dibaryon production in inclusive Y(1S) and Y(2S) decays. No indication of an H-dibaryon with mass near the MH=2mΛ threshold is seen in either ...the H-> Λpπ- or ΛΛ decay channels and 90% confidence level branching-fraction upper limits are set that are between one and two orders of magnitude below the measured branching fractions for inclusive Y(1S) and Y(2S) decays to antideuterons. Since Y(1,2S) decays produce flavor-SU(3)-symmetric final states, these results put stringent constraints on H-dibaryon properties. The results are based on analyses of 102 million Y(1S) and 158 million Y(2S) events collected with the Belle detector at the KEKB electron-positron collider.
We measure the decay B_{s}^{0}→K^{0}Kover ¯^{0} using data collected at the ϒ(5S) resonance with the Belle detector at the KEKB e^{+}e^{-} collider. The data sample used corresponds to an integrated ...luminosity of 121.4 fb^{-1}. We measure a branching fraction B(B_{s}^{0}→K^{0}Kover ¯^{0})=19.6_{-5.1}^{+5.8}(stat)±1.0(syst)±2.0(N_{B_{s}^{0}Bover ¯_{s}^{0}})×10^{-6} with a significance of 5.1 standard deviations. This measurement constitutes the first observation of this decay.
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