arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1105.0773hep-phhep-ex
收藏

Z极附近新的矢量玻色子及其在精密电弱数据中的困惑

New Vector Boson Near the Z-pole and the Puzzle in Precision Electroweak Data

Radovan Dermisek, Sung-Gi Kim, Aditi Raval

摘要:

结果表明,与Z玻色子相比,Z'与电子的耦合被抑制,与b夸克的耦合被抑制,并且Z'的质量接近Z玻色子的质量,这使得Z '与b夸克的前后不对称性、Z极上测量的R_b和Z极外的$\pm 2$ GeV以及强子末态左右不对称性测量得到的A_e有很好的拟合。这也导致了Z极上的强子总截面和Z极以上能量处的R_b的显著改善。此外,在适当的质量下,它可以解释在$b\bar b$不变质量的90-105 GeV区域中LEP的过量$Zb\bar b$事件。

英文摘要:

We show that a Z' with suppressed couplings to the electron compared to the Z-boson, with couplings to the b-quark, and with a mass close to the mass of the Z-boson, provides an excellent fit to forward-backward asymmetry of the b-quark and R_b measured on the Z-pole and $\pm 2$ GeV off the Z-pole, and to A_e obtained from the measurement of left-right asymmetry for hadronic final states. It also leads to a significant improvement in the total hadronic cross section on the Z-pole and R_b measured at energies above the Z-pole. In addition, with a proper mass, it can explain the excess of $Zb\bar b$ events at LEP in the 90-105 GeV region of the $b\bar b$ invariant mass.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑