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https://hdl.handle.net/2440/124255
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Type: | Journal article |
Title: | Search for flavour-changing neutral currents in processes with one top quark and a photon using 81 fb¯¹ of pp collisions at √s=13 TeV with the ATLAS experiment |
Other Titles: | Search for flavour-changing neutral currents in processes with one top quark and a photon using 81 fb -bar(1) of pp collisions at root s=13 TeV with the ATLAS experiment |
Author: | Aad, G. Abbott, B. Abbott, D.C. Abed Abud, A. Abeling, K. Abhayasinghe, D.K. Abidi, S.H. AbouZeid, O.S. Abraham, N.L. Abramowicz, H. Abreu, H. Abulaiti, Y. Acharya, B.S. Achkar, B. Adachi, S. Adam, L. Adam Bourdarios, C. Adamczyk, L. Adamek, L. Adelman, J. et al. |
Citation: | Physics Letters B: Nuclear Physics and Particle Physics, 2020; 800:1-21 |
Publisher: | Elsevier |
Issue Date: | 2020 |
ISSN: | 1873-2445 1873-2445 |
Statement of Responsibility: | G. Aad, B. Abbott, D.C. Abbott, A. Abed Abud ... Paul Jackson ... Abhishek Sharma ... et al. (The Atlas Collaboration) |
Abstract: | A search for flavour-changing neutral current (FCNC) events via the coupling of a top quark, a photon, and an up or charm quark is presented using 81 fb−1of proton–proton collision data taken at a centre-of-mass energy of 13 TeV with the ATLAS detector at the LHC. Events with a photon, an electron or muon, a b-tagged jet, and missing transverse momentum are selected. A neural network based on kinematic variables differentiates between events from signal and background processes. The data are consistent with the background-only hypothesis, and limits are set on the strength of the tqγcoupling in an effective field theory. These are also interpreted as 95% CL upper limits on the cross section for FCNC tγproduction via a left-handed (right-handed) tuγcoupling of 36 fb (78 fb) and on the branching ratio for t→γuof 2.8 ×10−5(6.1 ×10−5). In addition, they are interpreted as 95% CL upper limits on the cross section for FCNC tγproduction via a left-handed (right-handed) tcγcoupling of 40 fb (33 fb) and on the branching ratio for t→γcof 22 ×10−5(18 ×10−5). |
Rights: | © 2019 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP³ |
DOI: | 10.1016/j.physletb.2019.135082 |
Published version: | http://dx.doi.org/10.1016/j.physletb.2019.135082 |
Appears in Collections: | Aurora harvest 4 Physics publications |
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hdl_124255.pdf | Published version | 1.44 MB | Adobe PDF | View/Open |
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