A precision measurement of the mass of the top quark
文献类型：期刊论文
| 刊名 | NATURE
 |
| 出版日期 | 2004 |
| 卷号 | 429期号:6992页码:638-642 |
| 关键词 | PAIR PRODUCTION DETECTOR EVENT |
| 通讯作者 | Estrada, J (reprint author), Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA. |
| 英文摘要 | The standard model of particle physics contains parameters such as particle masses - whose origins are still unknown and which cannot be predicted, but whose values are constrained through their interactions. In particular, the masses of the top quark (M-t) and W boson (M-W)(1) constrain the mass of the long-hypothesized, but thus far not observed, Higgs boson. A precise measurement of Mt can therefore indicate where to look for the Higgs, and indeed whether the hypothesis of a standard model Higgs is consistent with experimental data. As top quarks are produced in pairs and decay in only about 10(-24) s into various final states, reconstructing their masses from their decay products is very challenging. Here we report a technique that extracts more information from each top-quark event and yields a greatly improved precision (of +/- 5.3 GeV/c(2)) when compared to previous measurements(2). When our new result is combined with our published measurement in a complementary decay mode(3) and with the only other measurements available(2), the new world average for M-t becomes(4) 178.0 +/- 4.3 GeV/c(2). As a result, the most likely Higgs mass increases from the experimentally excluded(5) value(6) of 96 to 117GeV/c(2), which is beyond current experimental sensitivity. The upper limit on the Higgs mass at the 95% confidence level is raised from 219 to 251 GeV/c(2). |
| 学科主题 | Science & Technology - Other Topics |
| 类目[WOS] | Multidisciplinary Sciences |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000221912600034 |
| 公开日期 | 2016-02-26 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/212399]  |
| 专题 | 高能物理研究所_实验物理中心 |
| 推荐引用方式 GB/T 7714 | . A precision measurement of the mass of the top quark[J]. NATURE,2004,429(6992):638-642. |
| APA | (2004).A precision measurement of the mass of the top quark.NATURE,429(6992),638-642. |
| MLA | "A precision measurement of the mass of the top quark".NATURE 429.6992(2004):638-642. |
入库方式： OAI收割
来源：高能物理研究所
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