Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland.
Phys Rev Lett. 2010 Jan 8;104(1):011801. doi: 10.1103/PhysRevLett.104.011801. Epub 2010 Jan 4.
We present the results of a search for supersymmetry with gauge-mediated breaking and chi(1)(0) --> gammaG in the gammagamma + missing transverse energy final state. In 2.6+/-0.2 fb(-1) of pp collisions at square root(s) = 1.96 TeV recorded by the CDF II detector we observe no candidate events, consistent with a standard model background expectation of 1.4+/-0.4 events. We set limits on the cross section at the 95% C.L. and place the world's best limit of 149 GeV/c2 on the chi(1)(0) mass at tau(chi(1)(0)) << 1 ns. We also exclude regions in the chi(1)(0) mass-lifetime plane for tau(chi(1)(0)) approximately < 2 ns.
我们展示了在 CDF II 探测器记录的 sqrt(s) = 1.96 TeV 的 pp 碰撞中，通过规范媒介打破和 chi(1)(0) --> gammaG 的希格斯玻色子衰变到光子和缺失横动量的最终态中寻找超对称的结果。在 2.6+/-0.2 fb(-1)的事例中，我们没有观察到候选事例，与标准模型背景预期的 1.4+/-0.4 个事例一致。我们在 95%置信度水平下设定了截面限制，并在 tau(chi(1)(0)) << 1 ns 时对 chi(1)(0)质量设定了世界上最好的限制为 149 GeV/c2。我们还排除了 tau(chi(1)(0))约 < 2 ns 时的 chi(1)(0)质量-寿命平面中的区域。
