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arXiv 0911.4634hep-phhep-ex
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Bottomonium的超精细分裂与$B_q (q=n,s,c)$介子

The Hyperfine Splittings in Bottomonium and the $B_q (q=n,s,c)$ Mesons

A. M. Badalian, B. L. G. Bakker, I. V. Danilkin

摘要:

在自旋-自旋势中,用普适强耦合常数$α_s(μ)=0.305(2)$对底鎓和$B_q (q=n,s,c)$介子的超精细分裂进行了普适描述。其他特性的计算领域内的相关器方法,采取冻结值的强耦合独立的$n_f$。对$n_f=3$和$n_f=4$的HFS $M(B^*)- M(B)=45.3(3)$ MeV和$M(B_s^*) - M(B_s)=46.5(3)$ MeV的计算结果与实验完全一致。在bottomonium中,$n_f=5$的$M(Υ(9460))- M(η_b)=70.0(4)$ MeV与BaBar数据一致,而$n_f=4$获得了更小的HFS,等于64(1)MeV。我们预测了HFS $M(Υ(2S))-M(η_b(2S))=36(1)$ MeV、$M(Υ(3S))- M(η(3S))=27(1)$ MeV和$M(B_c^*) - M(B_c)= 57.5(10)$ MeV,得到了$M(B_c^*)=6334(1)$ MeV、$M(B_c(2 {}^1S_0))=6865(5)$ MeV和$M(B_c^*(2S {}^3S_1))=6901(5)$ MeV。

英文摘要:

A universal description of the hyperfine splittings (HFS) in bottomonium and the $B_q (q=n,s,c)$ mesons is obtained with a universal strong coupling constant $α_s(μ)=0.305(2)$ in a spin-spin potential. Other characteristics are calculated within the Field Correlator Method, taking the freezing value of the strong coupling independent of $n_f$. The HFS $M(B^*)- M(B)=45.3(3)$ MeV, $M(B_s^*) - M(B_s)=46.5(3)$ MeV are obtained in full agreement with experiment both for $n_f=3$ and $n_f=4$. In bottomonium, $M(Υ(9460))- M(η_b)=70.0(4)$ MeV for $n_f=5$ agrees with the BaBar data, while a smaller HFS, equal to 64(1) MeV, is obtained for $n_f=4$. We predict HFS $M(Υ(2S))-M(η_b(2S))=36(1)$ MeV, $M(Υ(3S))- M(η(3S))=27(1)$ MeV, and $M(B_c^*) - M(B_c)= 57.5(10)$ MeV, which gives $M(B_c^*)=6334(1)$ MeV, $M(B_c(2 {}^1S_0))=6865(5)$ MeV, and $M(B_c^*(2S {}^3S_1))=6901(5)$ MeV.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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