arXiv 1707.010802017-07hep-phhep-ex

扩大LHC共振简化限值的范围

Broadening the Reach of Simplified Limits on Resonances at the LHC

R. Sekhar Chivukula, Pawin Ittisamai, Kirtimaan Mohan, Elizabeth H. Simmons

备注：: 26 pages, 6 figures (figures improved, minor additions to text for publication)
发表信息：: Phys. Rev. D 96, 055043 (2017)
DOI：: 10.1103/PhysRevD.96.055043

摘要：

最近，我们引入了一种方法，可以更容易地解释LHC的共振搜索，并帮助区分潜在信号的现实和不现实的替代方案。这种“简化极限”方法是使用窄宽度近似（NWA）推导出来的，因此在较宽共振的情况下并不明显相关。在这里，我们扩大了分析的范围。首先，我们明确概括的形式主义，包括共振的有限宽度。然后，我们研究如何修改的共振宽度从大型强子对撞机搜索中提取的新的共振的界限。其次，我们证明，使用各种各样的情况下，不同的传入部分子，共振特性，和衰变签名，在NWA产量相关的限制，并有点保守（不太严格）的模型参数的界限。我们的结论是，原来的简化限制的方法是有用的，在早期阶段的评估和解释新的对撞机数据和广义的方法是一个有价值的进一步援助时，证据指向一个更广泛的共振。

英文摘要：

Recently, we introduced an approach for more easily interpreting searches for resonances at the LHC - and to aid in distinguishing between realistic and unrealistic alternatives for potential signals. This `simplfied limits' approach was derived using the narrow width approximation (NWA) - and therefore was not obviously relevant in the case of wider resonances. Here, we broaden the scope of the analysis. First, we explicitly generalize the formalism to encompass resonances of finite width. We then examine how the width of the resonance modifies bounds on new resonances that are extracted from LHC searches. Second, we demonstrate, using a wide variety of cases, with different incoming partons, resonance properties, and decay signatures, that the limits derived in the NWA yield pertinant, and somewhat conservative (less stringent) bounds on the model parameters. We conclude that the original simplified limits approach is useful in the early stages of evaluating and interpreting new collider data and that the generalized approach is a valuable further aid when evidence points toward a broader resonance.

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