标题： 在大型强子对撞机上触发软炸弹 显示英文标题

标题： Triggering Soft Bombs at the LHC

摘要： 非常高的多重性，软粒子的球对称分布，其中$p_T$约为几百 MeV，可能是强耦合隐藏山谷的特征，这些山谷表现出长而高效的喷注窗口。 通过传统触发器，这种“软炸弹”事件与堆积效应非常相似，因此只能以非常低的效率通过最小偏倚触发器进行记录。 我们展示了一种高级触发策略的概念验证，该策略通过在跟踪器最内层寻找一个“火带”：高密度的撞击带，从而有效地将软炸弹与堆积效应区分开来。 使用现有的喷注、缺失横向能量或轻子硬件级触发器作为我们提出的高级触发器的种子，我们表明对于质量为几百 GeV 的炸弹，净触发效率可以达到约 10%。 我们还考虑了软炸弹是 125 GeV 希格斯玻色子奇异衰变结果的特殊情况。 通过这种方式触发的“希格斯炸弹”的有效率略高于直接对关联希格斯产生中的硬缪子进行触发所能达到的速率。 显示英文摘要

摘要： Very high multiplicity, spherically-symmetric distributions of soft particles, with $p_T$ ~ few hundred MeV, may be a signature of strongly-coupled hidden valleys that exhibit long, efficient showering windows. With traditional triggers, such "soft bomb" events closely resemble pile-up and are therefore only recorded with minimum bias triggers at a very low efficiency. We demonstrate a proof-of-concept for a high-level triggering strategy that efficiently separates soft bombs from pile-up by searching for a "belt of fire": A high density band of hits on the innermost layer of the tracker. Seeding our proposed high-level trigger with existing jet, missing transverse energy or lepton hardware-level triggers, we show that net trigger efficiencies of order 10% are possible for bombs of mass several hundred GeV. We also consider the special case that soft bombs are the result of an exotic decay of the 125 GeV Higgs. The fiducial rate for "Higgs bombs" triggered in this manner is marginally higher than the rate achievable by triggering directly on a hard muon from associated Higgs production.