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Division of High Energy Physics, Department of Physics, University of Helsinki, FIN-00014 Helsinki, Finland and Helsinki Institute of Physics, FIN-00014 Helsinki, Finland.
Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy.
Phys Rev Lett. 2015 Apr 10;114(14):141802. doi: 10.1103/PhysRevLett.114.141802.
A search for particles with the same mass and couplings as those of the standard model Higgs boson but different spin and parity quantum numbers is presented. We test two specific alternative Higgs boson hypotheses: a pseudoscalar Higgs boson with spin-parity J^{P}=0^{-} and a gravitonlike Higgs boson with J^{P}=2^{+}, assuming for both a mass of 125 GeV/c^{2}. We search for these exotic states produced in association with a vector boson and decaying into a bottom-antibottom quark pair. The vector boson is reconstructed through its decay into an electron or muon pair, or an electron or muon and a neutrino, or it is inferred from an imbalance in total transverse momentum. We use expected kinematic differences between events containing exotic Higgs bosons and those containing standard model Higgs bosons. The data were collected by the CDF experiment at the Tevatron proton-antiproton collider, operating at a center-of-mass energy of sqrt[s]=1.96 TeV, and correspond to an integrated luminosity of 9.45 fb^{-1}. We exclude deviations from the predictions of the standard model with a Higgs boson of mass 125 GeV/c^{2} at the level of 5 standard deviations, assuming signal strengths for exotic boson production equal to the prediction for the standard model Higgs boson, and set upper limits of approximately 30% relative to the standard model rate on the possible rate of production of each exotic state.
本文介绍了对具有与标准模型希格斯玻色子相同质量和耦合，但自旋和宇称量子数不同的粒子的搜索。我们测试了两种特定的希格斯玻色子替代假设：一种自旋宇称(J^{P}=0^{-})的赝标量希格斯玻色子和一种(J^{P}=2^{+})的类引力子希格斯玻色子，两者均假设质量为(125,\text{GeV}/c^{2})。我们搜索与矢量玻色子相关产生并衰变成底夸克 - 反底夸克对的这些奇异态。矢量玻色子通过其衰变成电子或缪子对，或电子或缪子与中微子来重建，或者从总横向动量的不平衡推断出来。我们利用包含奇异希格斯玻色子的事件与包含标准模型希格斯玻色子的事件之间预期的运动学差异。数据由Tevatron质子 - 反质子对撞机上的CDF实验收集，对撞机质心能量为(\sqrt{s}=1.96,\text{TeV})，对应积分亮度为(9.45,\text{fb}^{-1})。假设奇异玻色子产生的信号强度等于标准模型希格斯玻色子的预测值，我们在(5)倍标准差水平上排除了质量为(125,\text{GeV}/c^{2})的希格斯玻色子的标准模型预测偏差，并对每种奇异态的可能产生率相对于标准模型速率设定了约(30%)的上限。
