Author:
Alhazmi Haider,Kim Jeong Han,Kong Kyoungchul,Lewis Ian M.
Abstract
Abstract
We investigate the sensitivity of the 14 TeV LHC to pair-produced top partners (T) decaying into the Standard Model top quark (t) plus either a gluon (g) or a photon (γ). The decays T → tg and T → tγ can be dominant when the mixing between the top partner and top quark are negligible. In this case, the conventional decays T → bW , T → tZ, and T → th are highly suppressed and can be neglected. We take a model-independent approach using effective operators for the T -t-g and T -t-γ interactions, considering both spin-
$$ \frac{1}{2} $$
1
2
and spin-
$$ \frac{3}{2} $$
3
2
top partners. We perform a semi-realistic simulation with boosted top quark tagging and an appropriate implementation of a jet-faking-photon rate. Despite a simple dimensional analysis indicating that the branching ratios BR(T → tγ) ≪ BR(T → tg) due to the electric-magnetic coupling being much smaller than the strong force coupling, our study shows that the LHC sensitivity to
$$ T\overline{T}\to t\overline{t}\gamma g $$
T
T
¯
→
t
t
¯
γ
g
is more significant than the sensitivity to
$$ T\overline{T}\to t\overline{t} gg $$
T
T
¯
→
t
t
¯
gg
. This is due to much smaller backgrounds attributed to the isolated high-p
T
photon. We find that with these decay channels and 3 ab−1 of data, the LHC is sensitive to top partner masses m
T
≲ 1.4-1.8 TeV for spin-
$$ \frac{1}{2} $$
1
2
and spin-
$$ \frac{3}{2} $$
3
2
top partners, respectively.
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics
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