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arXiv 1603.03052hep-phhep-ex
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恢复喷气式飞机否决权对斯莱普顿公司的影响

Impact of Jet Veto Resummation on Slepton Searches

Frank J. Tackmann, Wouter J. Waalewijn, Lisa Zeune

摘要:

在大型强子对撞机上对新物理的几次搜索需要固定数量的信号喷流,否决了来自QCD辐射的额外喷流的事件。当新物理的探测尺度比喷流否决尺度大得多时,这种喷流否决强烈地影响了QCD微扰级数,导致了非平凡的理论不确定性。我们考虑了零信号喷流的slepton对产生,我们对喷流-否决图进行了重新模拟,并研究了它的影响。目前,实验排除限制考虑射流否决削减外推到包容性截面使用部分子簇射Monte Carlos。我们的研究结果表明,相关的理论不确定性可以很大,并考虑到有相当大的影响已经对目前的排斥限制。这是通过执行更高的订单,这使我们能够获得准确的预测,即使是高slepton质量的再确认改善。为了从改进的理论预测中受益,对实验结果进行解释,对实验分析也提供对展开的可见O-射流截面的限制将是有用的。

英文摘要:

Several searches for new physics at the LHC require a fixed number of signal jets, vetoing events with additional jets from QCD radiation. As the probed scale of new physics gets much larger than the jet-veto scale, such jet vetoes strongly impact the QCD perturbative series, causing nontrivial theoretical uncertainties. We consider slepton pair production with 0 signal jets, for which we perform the resummation of jet-veto logarithms and study its impact. Currently, the experimental exclusion limits take the jet-veto cut into account by extrapolating to the inclusive cross section using parton shower Monte Carlos. Our results indicate that the associated theoretical uncertainties can be large, and when taken into account have a sizeable impact already on present exclusion limits. This is improved by performing the resummation to higher order, which allows us to obtain accurate predictions even for high slepton masses. For the interpretation of the experimental results to benefit from improved theory predictions, it would be useful for the experimental analyses to also provide limits on the unfolded visible 0-jet cross section.

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