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The possible existence of a light CP-odd Higgs state in many new-physics models could lead to observable effects in the bottomonium sector. Experimental bounds on radiative Υ decays through such a pseudoscalar state and possible mixings with the η b states are reviewed. Combining these two effects, we set constraints on the properties of the CP-odd Higgs in the limit of small photon energy of B...
The η production in the (n, n ′) bottomonium transitions Υ(n) → Υ(n ′)η, is studied in the method used before for dipion heavy quarko-nia transitions. The widths Γ η (n, n ′) are calculated without fitting parameters for n = 2, 3, 4, 5, n ′ = 1.Resulting Γ η (4, 1) is found to be large in agreement with recent data. Multipole expansion method is shown to be inadequate for large size systems con...
We report on a measurement of the Υ(1S+2S+3S) → e + e − cross section at midrapidity in p + p collisions at √ s = 200 GeV. We find the cross section to be 114 ± 38 (stat. + fit) +23 −24 (syst.) pb. Perturbative QCD calculations at next-to-leading order in the Color Evaporation Model are in agreement with our measurement, while calculations in the Color Singlet Model underestimate it by 2σ. Our ...
We calculate the cross sections for the direct hadroproduction of J/ψ and Υ associated with a heavy-quark pair of the same flavour at leading order in α S and v in NRQCD. These processes provide an interesting signature that could be studied at the Tevatron and the LHC and also constitute a gauge-invariant subset of the NLO corrections to the inclusive hadroproduction of J/ψ and Υ. We find that...
We report results based on a 1.86 fb −1 data sample collected on the Υ(5S) resonance by the Belle detector at the KEKB asymmetric energy e + e − collider. The inclusive production of Ds, D 0 and J/ψ mesons at the Υ(5S) is studied. From the Ds inclusive branching fraction the ratio fs = (16.4 ± 1.4 ± 4.1)% of B (*) s ¯ B (*) s to the total b ¯ b quark pair production at the Υ(5S) energy is obtai...
We present Incremental Thin Junction Trees, a general framework for approximate inference in static and dynamic Bayesian Networks. This framework incrementally builds junction trees representing probability distributions over a dynamically changing set of variables. Variables and their conditional probability tables can be introduced into the junction tree Υ, they can be summed out of Υ and Υ c...
Heavy hadrons containing heavy quarks (for example, Υ mesons) feature a scale separation between the heavy-quark mass and the QCD scale that controls the effective masses of lighter constituents. As in ordinary molecules, the deexcitation of the lighter, faster degrees of freedom leaves the velocity distribution of the heavy quarks unchanged, populating the available decay channels in qualitati...
Two Level Cretan Matrices Constructed via Singer Difference Sets N. A. Balonin and Jennifer Seberry† October 4, 2014 We show that if B is the incidence matrix of a (υ, k, λ) difference set, then there exists a two-level quasi-orthogonal matrix, S, a Cretan(υ) matrix. We apply this result to the Singer family of difference sets obtaining a new infinite family of Cretan matrices.
A detailed compilation of uncertainties in the MS bottom quark mass mb(mb) obtained from low-n spectral sum rules at order αs is given including charm mass effects and secondary bb̄ production. The experimental continuum region above 11.1 GeV is treated conservatively. An inconsistency of the PDG averages for the electronic partial widths of Υ(4S) and Υ(5S) is pointed out. From our analysis we o...
Several authors have investigated conditions for a binary block design, D, to be maximally robust such that every eventual design obtained from D by eliminating r[υ] − 1 blocks, is connected, where r[υ] is the smallest treatment replication. Four new results for the maximal robustness of D with superior properties are given. An extension of these results to widen the assessment of robustness of...
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