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arXiv 0808.0232hep-ph
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B介子波函数通过$B\to π$、$K$跃迁形状因子的比较分析

B-Meson Wave Function through A Comparative Analysis of the $B\to π$, $K$ Transition Form Factors

Dai-Min Zeng, Xing-Gang Wu, Zhen-Yun Fang

摘要:

通过比较$k_T$因子分解方法中的$B\to π$、$K$跃迁形状因子和光锥求和规则分析,研究了B介子光锥波函数的性质.在大反冲区,采用$k_T$分解方法,对跃迁形状因子$F^{B\toπ}_{+,0,T}$和$F^{B\to K}_{+,0,T}$进行了重新计算,得到了${\cal O}(1/m_b^2)$,并对主要的理论不确定性进行了讨论. QCD光锥求和规则适用于大、中能区,并采用文献\cite{sumrule}中的QCD光锥求和规则进行了比较研究。结果表明,当两个唯象参数$\barΛ\in [0.50,0.55]$和$δ\in[0.25,0.30]$在大反冲能区时,两种方法计算的$F^{B\toπ}_{+,0,T}(Q^2)$和$F^{B\to K}_{+,0,T}(Q^2)$是一致的。

英文摘要:

The properties of the B-meson light-cone wave function up to next-to-leading order Fock state expansion have been studied through a comparative study of the $B\to π$, $K$ transition form factors within the $k_T$ factorization approach and the light-cone sum rule analysis. The transition form factors $F^{B\toπ}_{+,0,T}$ and $F^{B\to K}_{+,0,T}$ are carefully re-calculated up to ${\cal O}(1/m_b^2)$ within the $k_T$ factorization approach in the large recoil region, in which the main theoretical uncertainties are discussed. The QCD light-cone sum rule is applicable in the large and intermediate energy regions, and the QCD light-cone sum rule results in Ref.\cite{sumrule} are adopted for such a comparative study. It is found that when the two phenomenological parameters $\barΛ\in [0.50,0.55]$ and $δ\in[0.25,0.30]$, the results of $F^{B\toπ}_{+,0,T}(Q^2)$ and $F^{B\to K}_{+,0,T}(Q^2)$ from these two approaches are consistent with each other in the large recoil energy region.

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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