Fakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg, Germany.
Physikalisches Institut, University of Bonn, Bonn, Germany.
Phys Rev Lett. 2014 Mar 7;112(9):091804. doi: 10.1103/PhysRevLett.112.091804. Epub 2014 Mar 5.
This Letter presents a search for quantum black-hole production using 20.3 fb-1 of data collected with the ATLAS detector in pp collisions at the LHC at √s = 8 TeV. The quantum black holes are assumed to decay into a final state characterized by a lepton (electron or muon) and a jet. In either channel, no event with a lepton-jet invariant mass of 3.5 TeV or more is observed, consistent with the expected background. Limits are set on the product of cross sections and branching fractions for the lepton+jet final states of quantum black holes produced in a search region for invariant masses above 1 TeV. The combined 95% confidence level upper limit on this product for quantum black holes with threshold mass above 3.5 TeV is 0.18 fb. This limit constrains the threshold quantum black-hole mass to be above 5.3 TeV in the model considered.
这封信介绍了使用 ATLAS 探测器在 LHC 上进行的 pp 碰撞中收集的 20.3 fb-1 数据，对量子黑洞的产生进行的搜索。假设量子黑洞衰变成一个最终状态，其特征是一个轻子（电子或缪子）和一个喷注。在这两个通道中，没有观察到具有 3.5 TeV 或更高的轻子-喷注不变质量的事件，这与预期的背景一致。在质量大于 1 TeV 的搜索区域中，对量子黑洞的轻子+喷注末态的截面和分支比的乘积进行了限制。对于阈值质量高于 3.5 TeV 的量子黑洞，该乘积的联合 95%置信水平上限为 0.18 fb。该限制将所考虑模型中的阈值量子黑洞质量约束在高于 5.3 TeV。
