10.1007-JHEP03(2017)113.pdf (1.4 MB)
Measurements of top quark spin observables in tt¯ events using dilepton final states in vs=8TeV pp collisions with the ATLAS detector
journal contribution
posted on 2023-06-09, 07:12 authored by Benedict AllbrookeBenedict Allbrooke, Lily AsquithLily Asquith, Alessandro CerriAlessandro Cerri, C A Chavez Barajas, Antonella De SantoAntonella De Santo, Fabrizio SalvatoreFabrizio Salvatore, I Santoyo Castillo, K Suruliz, Mark SuttonMark Sutton, Iacopo Vivarelli, The ATLAS CollaborationMeasurements of top quark spin observables in tt¯ events are presented based on 20.2 fb-¹ of vs=8TeV proton-proton collisions recorded with the ATLAS detector at the LHC. The analysis is performed in the dilepton final state, characterised by the presence of two isolated leptons (electrons or muons). There are 15 observables, each sensitive to a different coefficient of the spin density matrix of tt¯ production, which are measured independently. Ten of these observables are measured for the first time. All of them are corrected for detector resolution and acceptance effects back to the parton and stable-particle levels. The measured values of the observables at parton level are compared to Standard Model predictions at next-to-leading order in QCD. The corrected distributions at stable-particle level are presented and the means of the distributions are compared to Monte Carlo predictions. No significant deviation from the Standard Model is observed for any observable.
Funding
ATLAS; G0275; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/I006048/1
History
Publication status
- Published
File Version
- Published version
Journal
Journal of High Energy PhysicsISSN
1126-6708Publisher
Springer VerlagExternal DOI
Issue
3Volume
2017Article number
a113Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Experimental Particle Physics Research Group Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2017-07-13First Open Access (FOA) Date
2017-07-13First Compliant Deposit (FCD) Date
2017-07-13Usage metrics
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