Abstract
This Letter presents a normalized differential cross-section measurement in a fiducial phase-space region where interference effects between top-quark pair production and associated production of a single top quark with a boson and a -quark are significant. Events with exactly two leptons (, , or ) and two -tagged jets that satisfy a multiparticle invariant mass requirement are selected from of proton-proton collision data taken at with the ATLAS detector at the LHC in 2015 and 2016. The results are compared with predictions from simulations using various strategies for the interference. The standard prescriptions for interference modeling are significantly different from each other but are within of the data. State-of-the-art predictions that naturally incorporate interference effects provide the best description of the data in the measured region of phase space most sensitive to these effects. These results provide an important constraint on interference models and will guide future model development and tuning.
- Received 13 June 2018
- Revised 6 August 2018
DOI:https://doi.org/10.1103/PhysRevLett.121.152002
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
© 2018 CERN, for the ATLAS Collaboration