@Article{ATLASCollaborationAad_etal2020,
author="ATLAS Collaboration (Aad, G. et al
and Aparisi Pozo, J. A.
and Bailey, A. J.
and Cabrera Urban, S.
and Castillo, F. L.
and Castillo Gimenez, V.
and Costa, M. J.
and Escobar, C.
and Estrada Pastor, O.
and Ferrer, A.
and Fiorini, L.
and Fullana Torregrosa, E.
and Fuster, J.
and Garcia, C.
and Garcia Navarro, J. E.
and Gonzalez de la Hoz, S.
and Gonzalvo Rodriguez, G. R.
and Guerrero Rojas, J. G. R.
and Higon-Rodriguez, E.
and Lacasta, C.
and Lozano Bahilo, J. J.
and Madaffari, D.
and Mamuzic, J.
and Marti-Garcia, S.
and Martinez Agullo, P.
and Miralles Lopez, M.
and Mitsou, V. A.
and Moreno Llacer, M.
and Poveda, J.
and Rodriguez Bosca, S.
and Ruiz-Martinez, A.
and Salt, J.
and Santra, A.
and Sayago Galvan, I.
and Soldevila, U.
and Sanchez, J.
and Valero, A.
and Valls Ferrer, J. A.
and Vos, M.",
title="CP Properties of Higgs Boson Interactions with Top Quarks in the (tt)over-barH and tH Processes Using H -> gamma gamma with the ATLAS Detector",
journal="Physical Review Letters",
year="2020",
publisher="Amer Physical Soc",
volume="125",
number="6",
pages="061802--21pp",
abstract="A study of the charge conjugation and parity (CP) properties of the interaction between the Higgs boson and top quarks is presented. Higgs bosons are identified via the diphoton decay channel (H -> gamma gamma), and their production in association with a top quark pair ((tt) over barH) or single top quark (tH) is studied. The analysis uses 139 fb(-1) of proton-proton collision data recorded at a center-of-mass energy off root s= 13 TeV with the ATLAS detector at the Large Hadron Collider. Assuming a CP-even coupling, the (tt) over barH process is observed with a significance of 5.2 standard deviations. The measured cross section times H -> gamma gamma branching ratio is 1.64(-0.36)(+0.38)(stat)(-0.14)(+0.17) (sys) fb, and the measured rate for (tt) over barH is 1.43(-0.31)(+0.33) (stat)(-0.15)(+0.21) (sys) times the Standard Model expectation. The tH production process is not observed and an upper limit on its rate of 12 times the Standard Model expectation is set. A CP-mixing angle greater (less) than 43 (-43)degrees is excluded at 95{\%} confidence level.",
optnote="WOS:000555785600003",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4496), last updated on Mon, 24 Aug 2020 09:27:14 +0000",
issn="0031-9007",
doi="10.1103/PhysRevLett.125.061802",
opturl="https://arxiv.org/abs/2004.04545",
opturl="https://doi.org/10.1103/PhysRevLett.125.061802",
language="English"
}