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arXiv 0905.4314hep-ph
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强子对撞机上矢量玻色子熔合过程中的喷流角关联

Jet angular correlation in vector-boson fusion processes at hadron colliders

Kaoru Hagiwara, Qiang Li, Kentarou Mawatari

备注：
47 pages, 7 figures, 10 tables; references added, version to appear in JHEP
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摘要：

研究了强子对撞机上两个喷注通过矢量玻色子融合（VBF）过程产生的希格斯玻色子和非对称引力子以及它们衰变为矢量玻色子对的过程。它们包括通过夸克-夸克碰撞中的弱玻色子融合，夸克-夸克、夸克-胶子和胶子-胶子碰撞中的胶子融合，以及它们衰变成一对弱玻色子或虚胶子，随后衰变成$\ell\bar\ell$、$q\bar q$或$gg$的标量和张量玻色子产生过程。我们明确地给出了所有VBF子过程的螺旋度振幅，并表明，VBF振幅不仅对弱玻色子融合过程，而且对所有胶子融合过程的精确矩阵元占主导地位时，适当的选择削减，如一个大的快度分离之间的两个射流和切片削减的横向动量的射流。我们还表明，我们的离壳矢量玻色子电流振幅减少到标准的夸克和胶子分裂振幅与适当的胶子极化相位在共线极限。在质量为0和2的玻色子的产生和衰变过程中喷注的非平凡方位角关联明显地表现为中间矢量玻色子的不同螺旋度态之间的量子干涉。这些相关性反映了希格斯玻色子玻色子和大质量引力子的自旋和CP性质。

英文摘要：

Higgs boson and massive-graviton productions in association with two jets via vector-boson fusion (VBF) processes and their decays into a vector-boson pair at hadron colliders are studied. They include scalar and tensor boson production processes via weak-boson fusion in quark-quark collisions, gluon fusion in quark-quark, quark-gluon and gluon-gluon collisions, as well as their decays into a pair of weak bosons or virtual gluons which subsequently decay into $\ell\bar\ell$, $q\bar q$ or $gg$. We give the helicity amplitudes explicitly for all the VBF subprocesses, and show that the VBF amplitudes dominate the exact matrix elements not only for the weak-boson fusion processes but also for all the gluon fusion processes when appropriate selection cuts are applied, such as a large rapidity separation between two jets and a slicing cut for the transverse momenta of the jets. We also show that our off-shell vector-boson current amplitudes reduce to the standard quark and gluon splitting amplitudes with appropriate gluon-polarization phases in the collinear limit. Nontrivial azimuthal angle correlations of the jets in the production and in the decay of massive spin-0 and -2 bosons are manifestly expressed as the quantum interference among different helicity states of the intermediate vector-bosons. Those correlations reflect the spin and the CP nature of the Higgs bosons and the massive gravitons.

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