نتایج جستجو برای: interferon υ ifn υ
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Using the Belle detector operating at the KEKB ee storage ring, we have measured the mean multiplicity and the momentum spectrum of neutral pions from the decays of the Υ(4S) resonance. We measure a mean of 4.70± 0.04 ± 0.22 neutral pions per Υ(4S) decay.
We examine the hadronic interactions of quarkonia, focusing on the decays ψ(2S) → J/ψππ and Υ(2S) → Υ(1S)ππ. The leading gluonic operators in the multipole expansion are matched onto the chiral lagrangian with the coefficients fit to available data, both at tree-level and loop-level in the chiral expansion. A comparison is made with naive expectations loosely based on the large-Nc limit of QCD ...
It is suggested that the quark-confining force is related by crossing symmetry to a colorsinglet glueball G which is well described as a loop of one quantum of color magnetic flux. Electron pair annihilation as high as ≈ 2GeV above the Υ mass could produce Υ → ll accompanied by G or one of its excited states.
Article history: Received 30 January 2015 Received in revised form 1 July 2015 Accepted 16 July 2015 Available online 22 July 2015 Editor: M. Doser
In this paper we show that second order tangency conditions are superfluous not to say useless while discussing the existence condition for certain second order differential inclusions. In this regard, a counterexample is provided even in the simpler setting of second order differential equations, where a substitute condition is propound. In the setting of differential inclusions, the correspon...
We give an estimate of the C-even B 0 ¯ B 0 background coming from the radia-tive decay Υ(4S) → B 0 ¯ B 0 γ at B-factories. Our result B(Υ(4S) → B 0 ¯ B 0 γ) ≃ 3× 10 −9 shows that such background could be safely neglected in the analyses of CP violating effects.
We calculate the rate for Υ decay into a pair of bottom squarks as a function of the masses of the bottom squark and the gluino. Data from decays of the Υ states could provide significant new bounds on the existence and masses of these supersymmetric particles. Typeset using REVTEX
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.
A fuzzy graph (f-graph) is a pair G : (σ, μ) where σ is a fuzzy subset of a set S and μ is a fuzzy relation on σ. A fuzzy graph H : (τ, υ) is called a partial fuzzy subgraph of G : (σ, μ) if τ (u) ≤ σ(u) for every u and υ (u, v) ≤ μ(u, v) for every u and v . In particular we call a partial fuzzy subgraph H : (τ, υ) a fuzzy subgraph of G : (σ, μ ) if τ (u) = σ(u) for every u in τ * and υ (u, v) ...
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