Higgs-boson production via bottom-quark fusion
Higgs-boson production via bottom-quark fusion
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DOI：
10.1103/physrevd.67.093005
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发表时间：
2003-01
影响因子：
5
通讯作者：
F. Maltoni;Z. Sullivan;S. Willenbrock;S. Willenbrock
中科院分区：
文献类型：
--
作者：
F. Maltoni;Z. Sullivan;S. Willenbrock;S. Willenbrock
在强子对撞机上，与底夸克耦合增强的希格斯玻色子在强子对撞机上被大量地产生，其中最初的b夸克位于质子海中。我们重新考察了这一过程的次前序截面的计算，并论证了b分布函数的合适的因式分解尺度大约是${m}_{h}/4，而不是先前假设的${m}_{h}。这极大地改善了摄动级数的收敛，并产生了一个具有温和的因式分解-尺度依赖性的结果。我们还表明，在末态粒子动量上积分的$g\stackrel{\ensuremath{\rightarrow}}{g}b\overline{b}h，‘的前序计算对因式分解和重整化尺度非常敏感。对于数量级为${m}_{h}/4$的标度，$g\stackrel{\ensuremath{\rightarrow}}{g}b\overline{b}h$截面与$boverline{b}\ensureath{\right tarrow}h的截面积相当，而对于标度${m}_{h}，这两个计算之间的数量级差异。我们所获得的结果改善了在强子对撞机上发现希格斯玻色子的前景。
Higgs bosons with enhanced coupling to bottom quarks are copiously produced at hadron colliders via $b\overline{b}\ensuremath{\rightarrow}h,$ where the initial b quarks reside in the proton sea. We reexamine the calculation of the next-to-leading-order cross section for this process and argue that the appropriate factorization scale for the b distribution functions is approximately ${m}_{h}/4,$ rather than ${m}_{h},$ as had been previously assumed. This greatly improves the convergence of the perturbation series, and yields a result with mild factorization-scale dependence. We also show that the leading-order calculation of $g\stackrel{\ensuremath{\rightarrow}}{g}b\overline{b}h,$ integrated over the momenta of the final-state particles, is very sensitive to the factorization and renormalization scales. For scales of order ${m}_{h}/4$ the $g\stackrel{\ensuremath{\rightarrow}}{g}b\overline{b}h$ cross section is comparable to that of $b\overline{b}\ensuremath{\rightarrow}h,$ in contrast with the order-of-magnitude discrepancy between these two calculations for the scale ${m}_{h}.$ The result we obtain improves the prospects for Higgs-boson discovery at hadron colliders for large values of $\mathrm{tan}\ensuremath{\beta}.$