Search for a new pseudoscalar decaying into a pair of muons in events with a top-quark pair at <math display="inline"><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math> with the ATLAS detector

Aad, Georges; Abbott, Braden Keim; Abeling, Kira; Abicht, Nils Julius; Abidi, Haider; Aboulhorma, Asmaa; Abramowicz, Halina; Abreu, Henso; Abulaiti, Yiming; Abusleme Hoffman, A.C.

doi:10.1103/PhysRevD.108.092007

Search for a new pseudoscalar decaying into a pair of muons in events with a top-quark pair at $\sqrt{s} = 13 TeV$ with the ATLAS detector

ATLAS

Collaboration

Apr 27, 2023

26 pages

Published in:

Phys.Rev.D 108 (2023) 9, 092007

Published: Nov 1, 2023

e-Print:

2304.14247 [hep-ex]

DOI:

10.1103/PhysRevD.108.092007 (publication)

PDG: Other Mass Limits

Report number:

CERN-EP-2023-070

Experiments:

CERN-LHC-ATLAS

View in:

datasets

reference search16 citations

Citations per year

Abstract: (APS)

A search for a new pseudoscalar

a

-boson produced in events with a top-quark pair, where the

a

-boson decays into a pair of muons, is performed using

\sqrt{s} = 13 TeV

p p

collision data collected with the ATLAS detector at the LHC, corresponding to an integrated luminosity of

139 {fb}^{- 1}

. The search targets the final state where only one top quark decays to an electron or muon, resulting in a signature with three leptons

e μ μ

and

μ μ μ

. No significant excess of events above the Standard Model expectation is observed and upper limits are set on two signal models:

p p \to t \bar{t} a

and

p p \to t \bar{t}

with

t \to H^{\pm} b

,

H^{\pm} \to W^{\pm} a

, where

a \to μ μ

, in the mass ranges

15 GeV < m_{a} < 72 GeV

and

120 GeV \leq m_{H^{\pm}} \leq 160 GeV

.

Note:

All figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2020-12/

p p: colliding beams
top: pair production
muon: pair production
p p: scattering
top: decay modes
pseudoscalar
new particle
ATLAS
electron
final state: ((n)jet 3lepton)

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Search for a new pseudoscalar decaying into a pair of muons in events with a top-quark pair at s=13 TeV with the ATLAS detector

Citations per year

The ATLAS Collaboration software and firmware

Search for a new pseudoscalar decaying into a pair of muons in events with a top-quark pair at $\sqrt{s} = 13 TeV$ with the ATLAS detector