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arXiv 0912.2806hep-ph
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在国际直线对撞机上鉴别额外中性规范玻色子

Identification of extra neutral gauge bosons at the International Linear Collider

P. Osland, A. A. Pankov, A. V. Tsytrinov

备注：
21 pages
发表信息：
Eur.Phys.J.C67:191-204,2010
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摘要：

重中性规范玻色子，Z的，被预测的许多理论方案的物理超越标准模型，和密集的搜索将在目前和未来的高能对撞机进行签名。很有可能Z的质量超过了CERN大型强子对撞机LHC的预期发现范围，在这种情况下，通过测量的截面与标准模型预测的偏差，在未来的对撞机上只会发生Z'交换的间接特征。本文讨论了在e^+e^-直线对撞机上费米对产生截面对Z的可预见的敏感性，特别是关于一旦观察到这种偏差就区分不同Z'模型的可能性。具体地说，我们评估了在计划中的国际直线对撞机（ILC）上发现和鉴定与E_6、LR、ALR和SSM模型有关的Z'规范玻色子的范围。由于ILC预期的高实验精度，在所考虑的Z'模型上的发现和识别范围可以大大增加。特别是，在LHC的发现范围内（但超出识别范围），可以实现不同模型之间的Z'质量值的识别。电子（可能还有正电子）的纵向极化束在增强这种到达方面起着重要作用。此外，虽然纯轻子过程在实验上更干净，但c-和b-夸克对产生截面的测量被发现携带了这些搜索的重要和补充信息。

英文摘要：

Heavy neutral gauge bosons, Z's, are predicted by many theoretical schemes of physics beyond the Standard Model, and intensive searches for their signatures will be performed at present and future high energy colliders. It is quite possible that Z's are heavy enough to lie beyond the discovery reach expected at the CERN Large Hadron Collider LHC, in which case only indirect signatures of Z' exchanges may occur at future colliders, through deviations of the measured cross sections from the Standard Model predictions. We here discuss in this context the foreseeable sensitivity to Z's of fermion-pair production cross sections at an e^+e^- linear collider, especially as regards the potential of distinguishing different Z' models once such deviations are observed. Specifically, we assess the discovery and identification reaches on Z' gauge bosons pertinent to the E_6, LR, ALR and SSM classes of models, that should be attained at the planned International Linear Collider (ILC). With the high experimental accuracies expected at the ILC, the discovery and the identification reaches on the Z' models under consideration could be increased substantially. In particular, the identification among the different models could be achieved for values of Z' masses in the discovery (but beyond the identification) reach of the LHC. An important role in enhancing such reaches is played by the electron (and possibly the positron) longitudinally polarized beams. Also, although the purely leptonic processes are experimentally cleaner, the measurements of c- and b-quark pair production cross sections are found to carry important, and complementary, information on these searches.

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