Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland.
Phys Rev Lett. 2010 Aug 20;105(8):081802. doi: 10.1103/PhysRevLett.105.081802. Epub 2010 Aug 19.
We report on a search for direct scalar bottom quark (sbottom) pair production in pp collisions at square root(s) = 1.96 TeV, in events with large missing transverse energy and two jets of hadrons in the final state, where at least one of the jets is required to be identified as originating from a b quark. The study uses a collider detector at Fermilab Run II data sample corresponding to 2.65 fb(-1) of integrated luminosity. The data are in agreement with the standard model. In an R-parity conserving minimal supersymmetric scenario, and assuming that the sbottom decays exclusively into a bottom quark and a neutralino, 95% confidence-level upper limits on the sbottom pair production cross section of 0.1 pb are obtained. For neutralino masses below 70 GeV/c2, sbottom masses up to 230 GeV/c2 are excluded at 95% confidence level.
我们报告了在 pp 碰撞中寻找直接标量底夸克（sbottom）对产生的情况，这些碰撞的能量为 square root(s) = 1.96 TeV，在最终态中具有大的横向能量缺失和两个强子喷注，其中至少一个喷注需要被识别为来自 b 夸克。这项研究使用了费米实验室运行 II 的对撞机探测器的数据样本，对应于 2.65 fb(-1) 的积分亮度。数据与标准模型一致。在 R 宇称守恒最小超对称情景下，并假设 sbottom 衰变仅为一个底夸克和一个中性微子，在 95%置信水平下，对 sbottom 对产生截面的上限为 0.1 pb。对于中性微子质量低于 70 GeV/c2，在 95%置信水平下排除了 sbottom 质量高达 230 GeV/c2 的情况。
