Fakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg iBr, Germany.
Phys Rev Lett. 2012 Jun 22;108(25):251801. doi: 10.1103/PhysRevLett.108.251801. Epub 2012 Jun 19.
A search for the decay of a light Higgs boson (120-140 GeV) to a pair of weakly interacting, long-lived particles in 1.94 fb(-1) of proton-proton collisions at sqrt[s] = 7 TeV recorded in 2011 by the ATLAS detector is presented. The search strategy requires that both long-lived particles decay inside the muon spectrometer. No excess of events is observed above the expected background and limits on the Higgs boson production times branching ratio to weakly interacting, long-lived particles are derived as a function of the particle proper decay length.
本文介绍了 ATLAS 探测器在 2011 年记录的 sqrt[s] = 7 TeV 质子-质子碰撞中，在 1.94 fb(-1)的事例中，对质量在 120-140GeV 之间的轻希格斯玻色子衰变为一对弱相互作用、长寿命粒子的搜索结果。该搜索策略要求两个长寿命粒子都在μ子谱仪内衰变。在预期的背景之上未观测到超出预期的事例，并且推导了希格斯玻色子产生时间与弱相互作用、长寿命粒子分支比的限制，作为粒子固有衰变长度的函数。
