Observation of top quark pairs produced in association with a vector boson in pp collisions at root s=8 TeV

Title
Observation of top quark pairs produced in association with a vector boson in pp collisions at root s=8 TeV
Authors
김태정
Keywords
Electroweak interaction; Hadron-Hadron scattering; Top physics
Issue Date
2016-01
Publisher
SPRINGER
Citation
JOURNAL OF HIGH ENERGY PHYSICS, NO 1, Article number 096, Page. 1-1
Abstract
Measurements of the cross sections for top quark pairs produced in association with a W or Z boson are presented, using 8 TeV pp collision data corresponding to an integrated luminosity of 19.5 fb(-1), collected by the CMS experiment at the LHC. Final states are selected in which the associated W boson decays to a charged lepton and a neutrino or the Z boson decays to two charged leptons. Signal events are identified by matching reconstructed objects in the detector to specific final state particles from t (t) over barW or t (t) over barZ decays. The t (t) over barW cross section is measured to be 382(-102)(+117) fb with a significance of 4.8 standard deviations from the background-only hypothesis. The t (t) over barZ cross section is measured to be 242(-55)(+65) fb with a significance of 6.4 standard deviations from the background-only hypothesis. These measurements are used to set bounds on five anomalous dimension-six operators that would affect the t (t) over barW and t (t) over barZ cross sections.
URI
https://link.springer.com/article/10.1007%2FJHEP01%282016%29096http://hdl.handle.net/20.500.11754/30485
ISSN
1029-8479
DOI
http://dx.doi.org/10.1007/JHEP01(2016)096
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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