arXiv 1407.42432014-07-28hep-phhep-ex

用$k_{t}$ -因子分解方法和标准模型耦合在LHC双光子通道中包含产生希格斯玻色子

Inclusive production of Higgs boson in the two-photon channel at the LHC within $k_{t}$-factorization approach and with the Standard Model couplings

Antoni Szczurek, Marta Luszczak, Rafal Maciula

备注：: 25 pages, 25 figures, 1 table, a missprint corrected, 2 references added
发表信息：: Phys. Rev. D 90, 094023 (2014)
DOI：: 10.1103/PhysRevD.90.094023

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摘要：

我们计算的微分截面的希格斯玻色子玻色子和/或双光子生产的中间（虚拟）希格斯玻色子玻色子内的$k_t$ -因式分解的形式主义。使用壳外$g^* g^* \to H$矩阵元素。我们比较了无限顶费米子（夸克）质量和有限质量的结果。后一种影响相当小。我们比较结果与不同的未整合的胶子分布从文献中。使用了两种方法。在第一种方法中，首先在$2 \to 1$ $g g \to H$ $k_t$ -因式分解方法中产生希格斯玻色子，然后用标准模型分支分数进行各向同性衰变。在第二种方法中，我们直接计算耦合到虚希格斯玻色子的两个光子。对两种方法的结果进行了比较，并讨论了差异。对来自希格斯玻色子的两个光子的结果与最近的ATLAS合作数据进行了比较。与最近的计算结果相反，对于文献中所有未积分的胶子分布，首阶$g g \to H$的贡献与ATLAS实验数据（$γγ$横动量和快度分布）相比是相当小的。我们还包括高阶贡献$g g \to H (\to γγ) g$，$g g \to g H g$和$W^+ W^-$和$Z^0 Z^0$的贡献。$gg\to Hg$机构给出与$gg\to H$机构相似的横截面。我们认为，有几乎没有重复计算时，添加$gg\to H$和$gg\to Hg$的贡献，由于不同的费曼图的拓扑结构。最后的总和与ATLAS双光子数据相当。我们讨论的理论方法和现有的UGDFs相关的不确定性。

英文摘要：

We calculate differential cross sections for Higgs boson and/or two-photon production from intermediate (virtual) Higgs boson within the formalism of $k_t$-factorization. The off-shell $g^* g^* \to H$ matrix elements are used. We compare results obtained with infinite top fermion (quark) mass and with finite mass taken into account. The latter effect is rather small. We compare results with different unintegrated gluon distributions from the literature. Two methods are used. In the first method first Higgs boson is produced in the $2 \to 1$ $g g \to H$ $k_t$-factorization approach and then isotropic decay with the Standard Model branching fraction is performed. In the second method we calculate directly two photons coupled to the virtual Higgs boson. The results of the two methods are compared and differences are discussed. The results for two photons from the Higgs boson are compared with recent ATLAS collaboration data. In contrast to a recent calculation the leading order $g g \to H$ contribution is rather small compared to the ATLAS experimental data ($γγ$ transverse momentum and rapidity distributions) for all unintegrated gluon distributions from the literature. We include also higher-order contribution $g g \to H (\to γγ) g$, $g g \to g H g$ and the contribution of the $W^+ W^-$ and $Z^0 Z^0$. The $gg\to Hg$ mechanism gives similar cross section as the $gg\to H$ mechanism. We argue that there is almost no double counting when adding $gg\to H$ and $gg\to Hg$ contributions due to different topology of Feynman diagrams. The final sum is comparable with the ATLAS two-photon data. We discuss uncertainties related to both the theoretical approach and existing UGDFs.

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