dc.contributor.author | CMS Collaboration | |
dc.contributor.author | Bean, Alice | |
dc.date.accessioned | 2015-12-30T17:48:25Z | |
dc.date.available | 2015-12-30T17:48:25Z | |
dc.date.issued | 2014-09-17 | |
dc.identifier.citation | The CMS Collaboration. "Measurement of top quark–antiquark pair production in association with a W or Z boson in pp collisions at s√=8 TeV." The European Physical Journal C. September, 2014: v74(9). http://dx.doi.org/10.1140/epjc/s10052-014-3060-7 | en_US |
dc.identifier.uri | http://hdl.handle.net/1808/19349 | |
dc.description | This is the published version. | en_US |
dc.description.abstract | A measurement of the 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. 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. | en_US |
dc.publisher | Springer Verlag | en_US |
dc.title | Measurement of top quark–antiquark pair production in association with a W or Z boson in pp collisions at s√=8 TeV | en_US |
dc.type | Article | |
kusw.kuauthor | Bean, Alice | |
kusw.kudepartment | Physics and Astronomy | en_US |
dc.identifier.doi | 10.1140/epjc/s10052-014-3060-7 | |
kusw.oaversion | Scholarly/refereed, publisher version | |
kusw.oapolicy | This item meets KU Open Access policy criteria. | |
dc.rights.accessrights | openAccess | |