Measurement of top quark–antiquark pair production in association with a W or Z boson in pp collisions at √s = 8 TeV

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/105429

Title:	Measurement of top quark–antiquark pair production in association with a W or Z boson in pp collisions at √s = 8 TeV
Authors:	余欣珊;Khachatryan, Vardan
Contributors:	理學院物理學系
Date:	2014-09-01
Issue Date:	2026-04-23 12:25:26 (UTC+8)
Publisher:	Springer New York;United States: Springer
Abstract:	摘要： The measurement of a cross section for the production of top quark–antiquark pairs (tt¯) in association with a vector boson V (W or Z) in proton-proton collisions at √s=8 TeV is presented. The results are based on a dataset corresponding to an integrated luminosity of 19.5 fb-1 recorded with the CMS detector at the LHC. The measurement is performed in three leptonic (e and μ) channels: a same-sign dilepton analysis targeting tt¯W events, and trilepton and four-lepton analyses designed for tt¯Z events. In the same-sign dilepton channel, the tt¯W cross section is measured as σtt¯W=170+90-80(stat)±70(syst)fb, corresponding to a significance of 1.6 standard deviations over the background-only hypothesis. Combining the trilepton and four-lepton channels, a direct measurement of the tt¯Z cross section, σtt¯Z=200+80-70(stat)+40-30(syst)fb-1, is obtained with a significance of 3.1 standard deviations. Finally, the measured cross sections are compatible with standard model predictions within their experimental uncertainties. The inclusive tt¯V process is observed with a significance of 3.7 standard deviations from the combination of all three leptonic channels. 出版者： United States: Springer 出版日期： 2014-09-17 出處： The European physical journal. C, Particles and fields, 2014-09, Vol.74 (9) 資源來源： Publicly Available Content Database 識別號： ISSN: 1434-6052 識別號： DOI: 10.1140/epjc/s10052-014-3060-7
Appears in Collections:	[Department of Physics] journal & Dissertation

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	16	View/Open

社群 sharing

Loading...