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Measurements of inclusive and differential cross-sections of combined tt̅γ andtWγproduction in the e μchannel at 13 TeV with the ATLAS detector
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Measurements of inclusive and differential cross-sections of combined tt̅γ andtWγproduction in the e μchannel at 13 TeV with the ATLAS detector

Georges Aad, Brad Abbott, Dale Charles Abbott, Adam Abed Abud, Kira Abeling, Deshan Kavishka Abhayasinghe, Syed Haider Abidi, Ossama Abouzeid, Nicola Abraham, Halina Abramowicz, …
The journal of high energy physics, 卷.9(9)
2020
DOI: https://doi.org/10.1007/JHEP09(2020)049
Web of Science ID: WOS:000570902100005

摘要

High Energy Physics - Experiment Physics
Inclusive and differential cross-sections for the production of top quarks in association with a photon are measured with proton-proton collision data corresponding to an integrated luminosity of 139 fb ⁻¹ . The data were collected by the ATLAS detector at the LHC during Run 2 between 2015 and 2018 at a centre-of-mass energy of 13 TeV. The measurements are performed in a fiducial volume defined at parton level. Events with exactly one photon, one electron and one muon of opposite sign, and at least two jets, of which at least one is b-tagged, are selected. The fiducial cross-section is measured to be 39.6_(-2.3)^(+2.7) fb. Differential cross-sections as functions of several observables are compared with state-of-the-art Monte Carlo simulations and next-to-leading-order theoretical calculations. These include cross-sections as functions of photon kinematic variables, angular variables related to the photon and the leptons, and angular separations between the two leptons in the event. All measurements are in agreement with the predictions from the Standard Model.[graphic not available: see fulltext]

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