ar X iv : h ep - e x / 01 10 01 2 v 1 5 O ct 2 00 1 BELLE KEK preprint 2001 - 131 Belle preprint 2001 - 15
نویسندگان
چکیده
The production of prompt J/ψ, ψ(2S), χc1 and χc2 is studied using a 32.4 fb data sample collected with the Belle detector at the Υ(4S) and 60 MeV below the resonance. The yield of prompt J/ψ mesons in the Υ(4S) sample is compatible with that of continuum production; we set an upper limit B(Υ(4S) → J/ψX) < 1.9 × 10−4 at the 95% confidence level, and find σ(e+e− → J/ψX) = 1.47 ± 0.10 ± 0.13 pb. The cross-sections for prompt ψ(2S) and direct J/ψ are measured. The J/ψ momentum spectrum, production angle distribution and polarization are studied. PACS numbers: 13.65.+i, 13.25.Gv, 14.40.Gx Typeset using REVTEX
منابع مشابه
ar X iv : h ep - e x / 01 12 02 6 v 1 1 9 D ec 2 00 1 Results on CP Violation from Belle
I describe the recent measurement of the CP violating parameter sin 2φ 1 = (0.99 ± 0.14 ± 0.05) from the Belle experiment at KEK.
متن کاملar X iv : h ep - e x / 04 11 06 5 v 2 2 6 Fe b 20 05 BELLE Belle Preprint 2004 - 34 KEK Preprint 2004 - 69 Observation of B + →
We report measurements of radiative B decays with Kηγ final states, using a data sample of 253 fb recorded at the Υ(4S) resonance with the Belle detector at the KEKB e+e− storage ring. We observe B+ → K+ηγ for the first time with a
متن کاملx / 01 07 06 1 v 2 1 A ug 2 00 1 BELLE KEK preprint 2001 - 50 Belle preprint 2001 - 10 Observation of Large CP Violation in the Neutral B Meson System
We present a measurement of the Standard Model CP violation parameter sin 2φ1 based on a 29.1 fb −1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. One neutral B meson is fully reconstructed as a J/ψKS , ψ(2S)KS , χc1KS , ηcKS , J/ψKL or J/ψK ∗0 decay and the flavor of the accompanying B meson is identified from its decay product...
متن کاملar X iv : h ep - e x / 01 04 05 1 v 1 2 8 A pr 2 00 1 BELLE KEK Preprint 2001 - 19 Belle Preprint 2001 - 4 Observation of Cabibbo suppressed
We report observations of the Cabibbo-suppressed decays B → D(∗)K− using a 10.4 fb−1 data sample accumulated at the Υ(4S) resonance with the Belle detector at the KEKB e+e− storage ring. The high-momentum particle identification system of Belle is used to isolate signals for B → D0K−, D+K−, D∗0K− and D∗+K− from the B → D(∗)π− decay processes which have much larger branching fractions. We report...
متن کاملar X iv : h ep - e x / 05 03 04 7 v 1 2 6 M ar 2 00 5 Belle Preprint 2005 - 13 KEK Preprint 2005 - 4
The angular distributions of the baryon-antibaryon low-mass enhancements seen in the charmless three-body baryonic B decays B+ → pp̄K+, B0 → pp̄K0 S , and B0 → pΛ̄π are reported. A quark fragmentation interpretation is supported, while the gluonic resonance picture is disfavored. Searches for the Θ+ and Θ++ pentaquarks in the relevant decay modes and possible glueball states G with 2.2 GeV/c2 < Mp...
متن کامل