arXiv 0909.23052009-09hep-ph

Tevatron和LHC上Higgs Q_T的改进预测

Improved Predictions for Higgs Q_T at the Tevatron and the LHC

Qing-Hong Cao, Chuan-Ren Chen, Carl Schmidt, Zhao Li, C. -P. Yuan

备注：: revised version, discussion of scale dependences added

摘要：

在Tevatron和LHC上寻找希格斯玻色子玻色子依赖于对希格斯玻色子玻色子产生和衰变的运动学的详细计算。本文改进了ResBos Monte Carlo程序中希格斯玻色子在胶子聚变产生过程$gg\to H$中的横动量分布$Q_T$的计算，将小$Q_T$处的微扰分布与高$Q_T$处的${\cal O}(α_{s}^4)$定阶微扰计算相匹配.在大$Q_T$下的分布比旧的${\cal O}(α_{s}^3)$固定阶微扰计算更高，并且与图解计算的匹配更平滑。总的截面也增加了，更符合次-次-前导阶的计算。我们还研究了新的计算$Δϕ_{\ell\ell}$的分布在整个过程$gg\to H\to W^{+} W^{-}\to\ell^{+}\ell^{-}ν\barν$的影响，和PDF的不确定性的影响，在Tevatron和LHC的分布。

英文摘要：

The search for the Higgs boson at the Tevatron and the LHC relies on detailed calculations of the kinematics of Higgs boson production and decay. In this paper, we improve the calculation of the distribution in transverse momentum, $Q_T$, of the Higgs boson in the gluon fusion production process, $gg\to H$, by matching the resummed distribution at small $Q_T$ with the ${\cal O}(α_{s}^4)$ fixed-order perturbative calculation at high $Q_T$ in the ResBos Monte Carlo program. The distribution is higher at large $Q_T$ than with the old ${\cal O}(α_{s}^3)$ fixed-order perturbative calculation, and the matching with the resummed calculation is much smoother. The total cross section is also increased, more in line with next-to-next-to-leading-order calculations. We also study the effect of the new calculation on the distribution of $Δϕ_{\ell\ell}$ in the overall process $gg\to H\to W^{+} W^{-}\to\ell^{+}\ell^{-}ν\barν$, and the effect of PDF uncertainties on the distributions at the Tevatron and the LHC.

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摘要：

英文摘要：

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