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arXiv 0710.4199hep-ex
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轨道激发B_s介子的观测

Observation of Orbitally Excited B_s Mesons

CDF Collaboration, T. Aaltonen

摘要:

本文报道了在费米实验室Tevatron上用CDF Ⅱ探测器在1.96TeV能量下首次观测到的两个与轨道激发态(L=1)B_s介子相一致的窄共振。我们利用二体衰变,将K^-和B^+介子重构为B^+ \to J/K^+,J/K ^+ \to μ^+ μ^-或B^+ \to \bar{D}^0 π^+,\bar{D}^0 \to K^+ π^-。我们推导出这两个态的质量分别为m(B_{s1})= 5829.4 +- 0.7 MeV/c^2和m(B_{s2} ^*)= 5839.7 +- 0.7 MeV/c^2。

英文摘要:

We report the first observation of two narrow resonances consistent with states of orbitally excited (L=1) B_s mesons using 1 fb^{-1} of ppbar collisions at sqrt{s} = 1.96 TeV collected with the CDF II detector at the Fermilab Tevatron. We use two-body decays into K^- and B^+ mesons reconstructed as B^+ \to J/ψK^+, J/ψ\to μ^+ μ^- or B^+ \to \bar{D}^0 π^+, \bar{D}^0 \to K^+ π^-. We deduce the masses of the two states to be m(B_{s1}) = 5829.4 +- 0.7 MeV/c^2 and m(B_{s2}^*) = 5839.7 +- 0.7 MeV/c^2.

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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