Observation of the Z -> psi l(+)l(-) Decay in pp Collisions at root s=13 TeV
文献类型：期刊论文
| 作者 | CMS Collaboration |
| 刊名 | PHYSICAL REVIEW LETTERS
 |
| 出版日期 | 2018 |
| 卷号 | 121期号:14页码:141801 |
| ISSN号 | 0031-9007 |
| DOI | 10.1103/PhysRevLett.121.141801 |
| 文献子类 | Article |
| 英文摘要 | This Letter presents the observation of the rare Z boson decay Z -> psi l(+)l(-). Here, psi represents contributions from direct J/psi and psi(2S) -> J/psi X, l(+)l(-) is a pair of electrons or muons, and the J/psi meson is detected via its decay to mu(+)mu(-). The sample of proton-proton collision data, collected by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV, corresponds to an integrated luminosity of 35.9 fb(-1). The signal is observed with a significance in excess of 5 standard deviations. After subtraction of the psi(2S) -> J/psi X contribution, the ratio of the branching fraction of the exclusive decay Z -> J/psi X, l(+) l(-) to the decay Z -> mu(+)mu(-)mu(+)mu(-) within a fiducial phase space is measured to be B(Z -> J/psi X, l(+) l(-))/B(Z -> mu(+)mu(-)mu(+)mu(-)) = 0.67 +/- 0.18(stat) +/- 0.05(syst). |
| 电子版国际标准刊号 | 1079-7114 |
| WOS关键词 | LEPTON PAIR ; Z(0) DECAY ; FRAGMENTATION ; QUARKONIUM ; CHARMONIUM |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000446406900001 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/286401]  |
| 专题 | 高能物理研究所_粒子天体物理中心 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | CMS Collaboration. Observation of the Z -> psi l(+)l(-) Decay in pp Collisions at root s=13 TeV[J]. PHYSICAL REVIEW LETTERS,2018,121(14):141801. |
| APA | CMS Collaboration.(2018).Observation of the Z -> psi l(+)l(-) Decay in pp Collisions at root s=13 TeV.PHYSICAL REVIEW LETTERS,121(14),141801. |
| MLA | CMS Collaboration."Observation of the Z -> psi l(+)l(-) Decay in pp Collisions at root s=13 TeV".PHYSICAL REVIEW LETTERS 121.14(2018):141801. |
入库方式： OAI收割
来源：高能物理研究所
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