Fakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg iBr, Germany.
Phys Rev Lett. 2011 Dec 30;107(27):272002. doi: 10.1103/PhysRevLett.107.272002. Epub 2011 Dec 29.
This Letter reports on a search for narrow high-mass resonances decaying into dilepton final states. The data were recorded by the ATLAS experiment in pp collisions at √s=7 TeV at the Large Hadron Collider and correspond to a total integrated luminosity of 1.08 (1.21) fb(-1) in the e(+)e(-) (μ(+)μ(-)) channel. No statistically significant excess above the standard model expectation is observed and upper limits are set at the 95% C.L. on the cross section times branching fraction of Z' resonances and Randall-Sundrum gravitons decaying into dileptons as a function of the resonance mass. A lower mass limit of 1.83 TeV on the sequential standard model Z' boson is set. A Randall-Sundrum graviton with coupling k/M(Pl)=0.1 is excluded at 95% C.L. for masses below 1.63 TeV.
这封信件报告了一项寻找窄质量高、衰变为双轻子末态的共振的研究。该数据由 ATLAS 实验在 LHC 的 pp 碰撞中以 √s=7 TeV 采集，对应于 e(+)e(-)（μ(+)μ(-)）道中的总积分亮度为 1.08（1.21）fb(-1)。未观测到超出标准模型预期的显著超额，并且在 Z'共振和 Randall-Sundrum 引力子衰变为双轻子的截面与分支比的乘积的 95%置信限下对其进行了限制，作为共振质量的函数。在顺序标准模型 Z'玻色子的下限为 1.83 TeV。对于质量低于 1.63 TeV 的 Randall-Sundrum 引力子，耦合 k/M(Pl)=0.1 被排除在 95%置信限之外。
