TY - JOUR

T1 - Search for top-philic heavy resonances in pp collisions at $$\sqrt{s}=13$$ $$\text {TeV}$$ with the ATLAS detector

AU - ATLAS Collaboration

AU - Barton, A.E.

AU - Bertram, I.A.

AU - Borissov, G.

AU - Bouhova-Thacker, E.V.

AU - Ferguson, Ruby

AU - Ferrando, J.

AU - Fox, H.

AU - Henderson, R.C.W.

AU - Jones, R.W.L.

AU - Kartvelishvili, V.

AU - Love, P.A.

AU - Marshall, E.J.

AU - Meng, L.

AU - Muenstermann, D.

AU - Ribaric, N.

AU - Rybacki, K.

AU - Smizanska, M.

AU - Spinali, S.

AU - Wharton, A.M.

AU - Yexley, Melissa

PY - 2024/2/15

Y1 - 2024/2/15

N2 - A search for the associated production of a heavy resonance with a top-quark or a top-antitop-quark pair, and decaying into a $$t{\bar{t}}$$ t t ¯ pair is presented. The search uses the data recorded by the ATLAS detector in pp collisions at $$\sqrt{s}= 13$$ s = 13 $$\text {TeV}$$ TeV at the Large Hadron Collider during the years 2015–2018, corresponding to an integrated luminosity of 139 $$\text {fb}^{-1}$$ fb - 1 . Events containing exactly one electron or muon are selected. The two hadronically decaying top quarks from the resonance decay are reconstructed using jets clustered with a large radius parameter of $$R=1$$ R = 1 . The invariant mass spectrum of the two top quark candidates is used to search for a resonance signal in the range of 1.0 $$\text {TeV}$$ TeV to 3.2 $$\text {TeV}$$ TeV . The presence of a signal is examined using an approach with minimal model dependence followed by a model-dependent interpretation. No significant excess is observed over the background expectation. Upper limits on the production cross section times branching ratio at 95% confidence level are provided for a heavy $$Z^\prime $$ Z ′ boson based on a simplified model, for $$Z^\prime $$ Z ′ mass between 1.0 $$\text {TeV}$$ TeV and 3.0 $$\text {TeV}$$ TeV . The observed (expected) limits range from 21 (14) fb to 119 (86) fb depending on the choice of model parameters.

AB - A search for the associated production of a heavy resonance with a top-quark or a top-antitop-quark pair, and decaying into a $$t{\bar{t}}$$ t t ¯ pair is presented. The search uses the data recorded by the ATLAS detector in pp collisions at $$\sqrt{s}= 13$$ s = 13 $$\text {TeV}$$ TeV at the Large Hadron Collider during the years 2015–2018, corresponding to an integrated luminosity of 139 $$\text {fb}^{-1}$$ fb - 1 . Events containing exactly one electron or muon are selected. The two hadronically decaying top quarks from the resonance decay are reconstructed using jets clustered with a large radius parameter of $$R=1$$ R = 1 . The invariant mass spectrum of the two top quark candidates is used to search for a resonance signal in the range of 1.0 $$\text {TeV}$$ TeV to 3.2 $$\text {TeV}$$ TeV . The presence of a signal is examined using an approach with minimal model dependence followed by a model-dependent interpretation. No significant excess is observed over the background expectation. Upper limits on the production cross section times branching ratio at 95% confidence level are provided for a heavy $$Z^\prime $$ Z ′ boson based on a simplified model, for $$Z^\prime $$ Z ′ mass between 1.0 $$\text {TeV}$$ TeV and 3.0 $$\text {TeV}$$ TeV . The observed (expected) limits range from 21 (14) fb to 119 (86) fb depending on the choice of model parameters.

KW - Physics and Astronomy (miscellaneous)

KW - Engineering (miscellaneous)

U2 - 10.1140/epjc/s10052-023-12318-9

DO - 10.1140/epjc/s10052-023-12318-9

M3 - Journal article

VL - 84

JO - European Physical Journal C: Particles and Fields

JF - European Physical Journal C: Particles and Fields

SN - 1434-6044

IS - 2

ER -