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arXiv 1105.4574hep-ph
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Beauty强子的半轻子宽度比

Semileptonic width ratios among beauty hadrons

I. I. Bigi, Th. Mannel, N. Uraltsev

摘要:

我们提出了基于QCD中重夸克展开的预言。我们发现在HQE框架下B介子的SU(3)破缺被抑制。与Gamma_{sl}(B_d)相比,B_s的半轻子宽度约小1%,λ_b约大3%。最大的部分速率预渐近效应是λ_b中b--> uell nu信道中的泡利干扰,约为+10%。我们指出,尽管质量很大,但Omega_b半轻子的宽度不会超过B_d,而且可能是稳定b强子中最小的。通过重质量膨胀,简要讨论了与相空间模型的根本差异。

英文摘要:

We present predictions based on the heavy quark expansion in QCD. We find SU(3) breaking in B mesons suppressed in the framework of the HQE. B_s is expected to have the semileptonic width about 1% lower and Lambda_b about 3% higher when compared to Gamma_{sl}(B_d). The largest partial-rate preasymptotic effect is Pauli interference in the b-->u ell nu channel in Lambda_b, about +10%. We point out that the Omega_b semileptonic width is expected not to exceed that of B_d and may turn out to be the smallest among stable b hadrons despite the large mass. The underlying differences with phase-space models are briefly addressed through the heavy mass expansion.

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