نتایج جستجو برای: coulombic interaction
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The most widely used criterion for the evaluation of chemical bonding, especially of weak bonding, are interatomic distances shorter than the sum of the van der Waals radii, d(X· · ·Y)< Σr(vdW)[X,Y]. The shortcomings of these radii are, however, so serious, that illicit conclusions are easily arrived at. It is proposed to discard the ‘shorter than Σr(vdW)’ criterion altogether and to rely on al...
Abstract. The results of resonance particle productions (ρ0, ω, K∗, φ, Σ∗, and Λ∗) measured by the STAR collaboration at RHIC from various colliding systems and energies are presented. Measured mass, width, 〈pT 〉, and yield of those resonances are reviewed. No significant mass shifts or width broadening beyond the experiment uncertainties are observed. New measurements of φ and ω from leptonic ...
The results of analytical evaluation of O(αs) QCD contributions due to the nonvanishing quark masses to ΓH→qfqf are presented. The “triangle anomaly” type contributions are included. As a byproduct the O(αs) logarithmic contributions are evaluated. The results are presented both in terms of running and pole quark masses. The partial decay modes H → bb and H → cc are considered. The calculated c...
Wavelet analysis has been used for intrinsic characterizations of important function and distribution spaces ([10], [11]). Recently, the wavelet transform has been extended to distributions, and inversion formulae have been established in distribution setting by Pathak [13, 14], Pathak et al [16, 17, 18] and Pandey [12] using duality arguments. Wavelets of subexponential decay whose Fourier tra...
The most precise determinations of Vus comes from semileptonic kaon decays. The KLOE experiment at DAΦNE the Frascati φ factory , has measured all the experimental inputs to Vus for both neutral and charged kaons. Preliminary results for BR(K± → π0e±ν) and BR(K± → π0μ±ν), and for τ± are presented, together with measurements of the KLe3 and KLμ3 decay BR, the KSe3 decay BR and the KL lifetime τL...
A theory of the B → Kη decay is proposed. It is based on the Cabbibo favored b → c̄cs process followed by a direct materialization of the c̄c pair into the η. This mechanism works due to a non-valence Zweig rule violating c-quark component of the η, which is unique to its very special nature. This non-perturbative “intrinsic charm” content of the η is evaluated using the Operator Product Expansio...
The invariant mass spectrum of the lepton pair in inclusive semileptonic B → Xulν decay yields a model independent determination of |Vub| [1]. Unlike the lepton energy and hadronic invariant mass spectra, nonperturbative effects are only important in the resonance region, and play a parametrically suppressed role when dΓ/dq is integrated over q > (mB − mD) , which is required to eliminate the B...
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We present results and prospects for searches for rare B and D meson decays with final state dimuons, including B s → μμ, B d → μμ, and D → μμ. Upper limits on the branching fractions are compared to previous CDF measurements, recent results from the B factories and theoretical expectations. We also report on new measurements of production and decay properties of the X(3872) particle, discovere...
We investigate the ionization of HeNe from below the He 1s3p excitation to the He ionization threshold. We observe HeNe+ ions with an enhancement by more than a factor of 60 when the He side couples resonantly to the radiation field. These ions are an experimental proof of a two-center resonant photoionization mechanism predicted by Najjari et al. [Phys. Rev. Lett. 105, 153002 (2010)]. Furtherm...
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