Projects per year
Abstract
at the Large Hadron Collider. The analysis considers leptonic decays of the top quark along with Higgs boson decays into two W bosons, two Z bosons or a τ +τ − pair. It focuses on final states containing either two leptons (electrons or muons) of the same charge or three leptons. The considered processes are t ¯t and H t production. For the t ¯t production, one top quark decays via t → H q. The proton–proton collision
data set analysed amounts to (140 fb−1) at (√s = 13 TeV). No significant excess beyond Standard Model expectations is observed and upper limits are set on the t → H q branching ratios at 95 % confidence level, amounting to observed (expected) limits of B(t → H u) < 2.8 (3.0) × 10−4 and B(t → H c) < 3.3 (3.8) × 10−4 . Combining this search
with other searches for t H q flavour-changing neutral-current interactions previously conducted by ATLAS, considering H → b ¯b and H → γ γ decays, as well as H → τ +τ −
decays with one or two hadronically decaying τ -leptons, yields observed (expected) upper limits on the branching ratios of B(t → H u) < 2.6 (1.8) × 10−4 and B(t → H c) <
3.4 (2.3) × 10−4 .
Original language | English |
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Article number | 757 |
Pages (from-to) | 1-42 |
Number of pages | 42 |
Journal | The European Physical Journal C |
Volume | 84 |
Issue number | 7 |
DOIs | |
Publication status | Published - 29 Jul 2024 |
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Dive into the research topics of 'Search for flavour-changing neutral-current couplings between the top quark and the Higgs boson in multi-lepton final states in 13~TeV pp collisions with the ATLAS detector'. Together they form a unique fingerprint.-
Upgrade of the ATLAS detector at the LHC (2023-26)
Clark, P. (Principal Investigator)
Science and Technology Facilities Council
1/04/23 → 31/03/27
Project: Research
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Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/04/23 → 31/03/26
Project: Research
-
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/10/22 → 31/03/26
Project: Research