Search for the t → ch decay at hadron colliders

• Published in: The journal of high energy physics Vol. 2019; no. 7; pp. 1 - 20
• Main Authors: Arroyo-Ureña, M. A., Gaitán, R., Herrera-Chacón, E. A., Montes de Oca Y., J. H., Valencia-Pérez, T. A.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-07-2019; Springer Nature B.V; SpringerOpen
• Subjects: Classical and Quantum Gravitation; Computer simulation; Constraint modelling; Decay; Elementary Particles; Flavor (particle physics); Higgs bosons; High energy physics; Large Hadron Collider; Luminosity; Observability (systems); Parameter modification; Phenomenological Models; Photons; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Quarks; Regular Article - Theoretical Physics; Relativity Theory; String Theory; Superconducting supercolliders; Phenomenological Models
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP07(2019)041

A
bstract
We study the observability for the flavor-changing decay of a top quark
t
→
ch
at the Large Hadron Collider (LHC) and future hadron colliders, namely, High-Luminosity LHC (HL-LHC), High-Energy LHC (HE-LHC) and Future Circular hadron-hadron Collider (FCC-hh). Two scenarios in which the Higgs boson could decay: into a quark bottom pair (
bb-channel
) and two photons (
γγ-channel
) are analyzed. A Monte Carlo analysis of the signal and the Standard Model (SM) background is computed. Center-of-mass energies of
s
=
14
,
27
and 100 TeV and integrated luminosities from 0.3 to 30 ab
−1
are explored. The theoretical framework adopted in this work is the Type-III Two-Higgs Doublet Model (THDM-III) for which, constraints on the parameter space from the Higgs boson coupling modifiers
κ
i
are presented and used in order to evaluate the branching ratio of the
t
→
ch
decay and the
pp
→
t
t
¯
,
t
→
c
h
production cross section. We find that with the integrated luminosity achieved at the LHC, the
t
→
ch
decay is out of the reach of detection. More promising results emerge for the HL-LHC, HE-LHC and FCC-hh in which potential discoveries could be claimed.