We report preliminary results on the analysis of the three-body Υ( 10860) → B Bπ, Υ(10860) → [B B * + c.c.]π and Υ(10860) → B * B * π decays including an observation of the Υ(10860) → Z ± b (10610)π ∓ → [B B * + c.c.] ± π ∓ and Υ(10860) → Z ± b (10650)π ∓ → [B * B * ] ± π ∓ decays as intermediate channels. We measure branching fractions of the three-body decays to be B(Υ(10860) → [B B * + c.c.] ± π ∓ ) = (28.3 ± 2.9 ± 4.6) × 10 −3 and B(Υ(10860) → [B * B * ] ± π ∓ ) = (14.1 ± 1.9 ± 2.4) × 10 −3 and set 90% C.L. upper limit B(Υ(10860) → [B B] ± π ∓ ) < 4.0 × 10 −3 . We also report results on the amplitude analysis of the three-body Υ(10860) → Υ(nS)π + π − , n = 1, 2, 3 decays and the analysis of the internal structure of the three-body Υ(10860) → h b (mP )π + π − , m = 1, 2 decays. The results are based on a 121.4 fb −1 data sample collected with the Belle detector at a center-of-mass energy near the Υ(10860).
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In the original article, it was found in Monte Carlo simulations that the reconstructed A 0 results are roughly consistent with the generated asymmetries, while the A 12 results systematically underestimate the generated asymmetries. This underestimation can be attributed to the difference between the reconstructed thrust axis and the original quark-antiquark axis. The corresponding correction factors are 1.66 ± 0.04 for the A 12 results and 1.11±0.05 for the A 0 results. Due to a flaw in the original analysis program, these correction factors were not applied to the A UC -type asymmetries in Table V as well as in some Figures. In addition, a small mistake in the error propagation in the charm correction resulted in slightly underestimated statistical uncertainties. These omissions affect all but the charm asymmetry results. The correct central values are therefore given in Tables IV and V of this Erratum. The systematic uncertainties of the original publication remain unchanged. A. Corrected figuresThe main results are the asymmetry parameters A 0 and A 12 for both types of double ratios (UL and UC) as a function of the fractional energies of the two hadrons. Figures 17 and 18 below (using the numbering of the original paper) show these asymmetries where all z 2 bins for a given z 1 are displayed. In both cases, the UC type asymmetries now have the correction factor appropriately taken into account, while the UL central values remain unchanged. In Figs. 19 and 20, the corrected asymmetries as a function of sin 2 θ 1+cos 2 (θ) are displayed for the UL and UC results, respectively. In both figures, the central values of the asymmetries using the polar angle of the thrust axis as reference are unchanged, but the central values using the polar angle of the second hadron as reference are modified and now have the corresponding correction factors applied. Together with the properly error-propagated uncertainties, all asymmetries can now be reasonably well described by a linear dependence; this is in contrast to what was originally stated. All values of χ 2 per degree of freedom for fits that fix the constant term to zero are now around unity.In comparing the asymmetries versus Q T for high and low thrust data samples, the results of the reverse thrust selection were displayed uncorrected for the charm and the Υ(4S) contributions. Similarly, the correction factor due to the axis smearing was not applied initially; Figs. 21 and 22 below now include both effects. The high thrust results are unchanged. The conclusions of the original publication are still valid as the reversed thrust selection asymmetries remain significantly smaller.
The design of an array to record air showers of energy up to 1021 eV is described. Each recording station uses two scintillator tanks spaced 50 m apart and generates a master pulse if [Formula: see text] particles pass through each tank in coincidence, n can be preset in the range 1 to 10. Pulse heights from each scintillator and the time of arrival of the shower front (to ±50 ns) are recorded on tape. The stations are designed to run for at least one week between servicings. Details are given of the scintillators, the circuitry (operated entirely from storage batteries), and the coincidence techniques.
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