12,689 research outputs found

    Re-evaluation of neutrino mixing pattern according to latest T2K result

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    We re-evaluate neutrino mixing patterns according to the latest T2K result for a larger mixing angle θ13\theta_{13}, and find that the PMNS mixing matrix has larger deviations from bimaximal (BM) and tribimaximal (TB) mixing patterns than previously expected. We also find that several schemes connecting PMNS and CKM mixing matrices can accommodate the latest T2K result nicely. As necessary updates to former works, we make new triminimal expansions of PMNS mixing matrix based on BM and TB mixing patterns. We also propose a new mixing pattern with a self-complementary relation between the mixing angles θ12ν+θ13ν≃45∘\theta_{12}^{\nu} + \theta_{13}^{\nu} \simeq 45^\circ, and find such a new mixing pattern in leading order can provide a rather good description of the data.Comment: 9 latex pages, no figure, final version for journal publicatio

    Production of doubly heavy baryons via Higgs boson decays

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    We systematically analyzed the production of semi-inclusive doubly heavy baryons (Ξcc\Xi_{cc}, Ξbc\Xi_{bc} and Ξbb\Xi_{bb}) for the process H0→ΞQQ′+Q′ˉ+QˉH^0 \rightarrow \Xi_{QQ'}+ \bar {Q'} + \bar {Q} through four main Higgs decay channels within the framework of non-relativistic QCD. The contributions from the intermediate diquark states, ⟨cc⟩[1S0]6\langle cc\rangle[^{1}S_{0}]_{\mathbf{6}}, ⟨cc⟩[3S1]3ˉ\langle cc\rangle[^{3}S_{1}]_{\mathbf{\bar 3}}, ⟨bc⟩[3S1]3ˉ/6\langle bc\rangle[^{3}S_{1}]_{\mathbf{\bar 3}/ \mathbf{6}}, ⟨bc⟩[1S0]3ˉ/6\langle bc\rangle[^{1}S_{0}]_{\mathbf{\bar 3}/ \mathbf{6}}, ⟨bb⟩[1S0]6\langle bb\rangle[^{1}S_{0}]_{\mathbf{6}} and ⟨bb⟩[3S1]3ˉ\langle bb\rangle[^{3}S_{1}]_{\mathbf{\bar 3}}, have been taken into consideration. The differential distributions and three main sources of the theoretical uncertainties have been discussed. At the High Luminosity Large Hadron Collider, there will be about 0.43×104\times10^4 events of Ξcc\Xi_{cc}, 6.32×104\times10^4 events of Ξbc\Xi_{bc} and 0.28×104\times10^4 events of Ξbb\Xi_{bb} produced per year. There are fewer events produced at the Circular Electron Positron Collider and the International Linear Collider, about 0.26×1020.26\times 10^{2} events of Ξcc\Xi_{cc}, 3.83×1023.83\times 10^{2} events of Ξbc\Xi_{bc} and 0.17×1020.17\times 10^{2} events of Ξbb\Xi_{bb} in operation.Comment: 15 pages, 3 figures, 7 table

    Hyperbolic character of the angular moment equations of radiative transfer and numerical methods

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    We study the mathematical character of the angular moment equations of radiative transfer in spherical symmetry and conclude that the system is hyperbolic for general forms of the closure relation found in the literature. Hyperbolicity and causality preservation lead to mathematical conditions allowing to establish a useful characterization of the closure relations. We apply numerical methods specifically designed to solve hyperbolic systems of conservation laws (the so-called Godunov-type methods), to calculate numerical solutions of the radiation transport equations in a static background. The feasibility of the method in any kind of regime, from diffusion to free-streaming, is demonstrated by a number of numerical tests and the effect of the choice of the closure relation on the results is discussed.Comment: 37 pags, 12 figures, accepted for publication in MNRA
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