Yerevan Physics Institute, Yerevan, Armenia.
Phys Rev Lett. 2012 Dec 28;109(26):261802. doi: 10.1103/PhysRevLett.109.261802. Epub 2012 Dec 27.
Results are presented from a search for heavy, right-handed muon neutrinos, N(μ), and right-handed W(R) bosons, which arise in the left-right symmetric extensions of the standard model. The analysis is based on a 5.0 fb(-1) sample of proton-proton collisions at a center-of-mass energy of 7 TeV, collected by the CMS detector at the Large Hadron Collider. No evidence is observed for an excess of events over the standard model expectation. For models with exact left-right symmetry, heavy right-handed neutrinos are excluded at 95% confidence level for a range of neutrino masses below the W(R) mass, dependent on the value of M(W(R)). The excluded region in the two-dimensional (M(W(R)), M(N(μ)) mass plane extends to M(W(R))=2.5 TeV.
研究结果来自对重、右旋中微子 N(μ)和右旋 W(R)玻色子的搜索，这些粒子出现在标准模型的左右对称扩展中。该分析基于在质心能量为 7 TeV 的质子-质子碰撞中收集的 5.0 fb(-1)的 CMS 探测器样本，没有观察到超出标准模型预期的事件过多的证据。对于具有精确左右对称性的模型，在 W(R)质量以下的一系列中微子质量范围内，重右旋中微子在 95%置信水平下被排除，具体取决于 M(W(R))的值。在二维 (M(W(R))，M(N(μ)))质量平面上的排除区域扩展到 M(W(R))=2.5 TeV。
