Υ dipion transitions at energies near theΥ(4S)

CLNS 98/1576 CLEO 98-12 Υ dipion transitions at energies near the Υ(4S).

Using a 4.19 fb−1 data sample collected with the CLEO II detector at the Cornell Electron Storage Ring, we have searched for dipion transitions between pairs of Υ resonances at center of mass energies Ecm = 10.58 GeV and Ecm = 10.52 GeV. We obtain the 90% confidence level upper limits B(Υ(4S) → Υ(2S)π+π−) < 3.9 × 10−4 and B(Υ(4S) → Υ(1S)π+π−) < 1.2 × 10−4. We also observe the transitions Υ(3S) ...

Hadronic transitions Υ ( 2 S ) → Υ ( 1 S )

Observation of a new χ(b) state in radiative transitions to Υ(1S) and Υ(2S) at ATLAS.

The χ(b)(nP) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider at sqrt[s] = 7  TeV and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of 4.4  fb(-1), these states are reconstructed through their radiative decays to Υ(1S,2S) with Υ → μ+ μ-. In addition to the mass peaks corresponding to the decay modes χ(b)(1P,2...

The Anomalous Υ(1s)π+π− and Υ(2s)π+π− Production near the Υ(5s) Resonance

We report the study of ee → Υ(1S)ππ, Υ(2S)ππ, Υ(3S)ππ, and Υ(1S)KK, near the peak of the Υ(5S) resonance. The results are based on a data sample of 21.7 fb collected with the Belle detector at the KEKB ee collider. Attributing the signals to the Υ(5S) resonance, the partial widths Γ(Υ(5S) → Υ(1S)ππ) = 0.59± 0.04(stat)± 0.09(syst) MeV and Γ(Υ(5S) → Υ(2S)ππ) = 0.85 ± 0.07(stat) ± 0.16(syst) MeV a...

Diffractive Photoproduction of Υ at

Predictions for the diffractive photoproduction of the Υ-family at HERA energies, within the framework of the analysis by Frankfurt, Koepf and Strikman, are presented. Two novel effects lead to a significant enhancement of the original calculation: the non-diagonal (or skewed) kinematics, calculated to leading-log(Q) accuracy, and the large magnitude of the real part of the amplitude. The resul...