共查询到20条相似文献,搜索用时 15 毫秒
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K. Tsushima 《Nuclear Physics A》2000,670(1-4):198-201
Using the quark-meson coupling (QMC) model, we investigate whether ω, η, η′ and D− mesons form meson-nucleus bound states. Our results suggest that one should expect to find η- and ω-nucleus bound states in all the nuclei considered. Furthermore, it is shown that the D− meson will form quite narrow bound states with 208Pb. 相似文献
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Sonja Franke-Arnold 《Optics and Lasers in Engineering》2003,40(3):226-227
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Motivated by the recently updated experimental measurement on \bar{B}_d→μ+μ- and B-→π-μ+μ- decays by CDF and Belle collaborations, we revisit these
decays, as well as B-→ρ-μ+μ- decay, within the Standard Model, and evaluate the effects of a family non-universal Z' boson. Under the constraint from {\cal B}(B-→π-μ+μ-), we find the ranges of the Z' couplings SLRμμ< -5.2×10-2 or DLRμμ < -8.1× 10-2 are excluded. Within the allowed Z' parameters spaces, comparing with the SM predictions, we find that {\cal B}(\bar{B}_d→ μ+μ-, {\cal B}(B-→ π-μ+μ-), and {\cal B}(B-→ρ-μ+μ-) could be enhanced by a factor about
226%, 245%, and 254%, respectively, byZ' contributions. However, they are hardly to be reduced. Furthermore, the zero crossing in the normalized forward-backward asymmetry spectrum of B- →ρ-μ+μ- decay at low dimuon mass always exists. 相似文献
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