606
M. Toharia
Fig. 3 Contours of the bottom quark Yukawa correction
δy b /y SM
b
with respect to the gluon
fusion signal strength μ V V
ggh and the ratio of the t ¯
th signal strengths μ bb
tth /μ V V
tth (left panel); and
dependence of the Higgs signal strength μ V V
tth with respect to the top quark Yukawa coupling
correction
δy t /y SM
t
(right panel). The Gray bands represent the experimental bounds set by the
LHC RUNS 1 and 2. The “Th. Excl.” region comprises all points excluded by the Brane Higgs
Limit constraint and we included (left) the two same parameter space points, marked by ⊕ and
as in the previous figure
After exploring the gluon fusion signals, we study the effect of small shifts in the
bottom Yukawa coupling in tth signals. In particular we focus on the behavior of
the ratios μ bb
tth /μ V V
tth = μ bb
V h /μ V V
V h as a function of μ V V
ggh (all top quark Yukawa
dependence cancels out in the ratio). This is shown on the left panel of Fig. 3,
where we consider variations of the ratio μ bb
tth /μ V V
tth with respect to the gluon fusion
strength μ bb
tth .
We now investigate the signals that do depend on the top Yukawa coupling
deviations. In the right panel of Fig. 3 we study the variation of μ V V
tth with respect
to the top Yukawa deviation |δy t |. The rest of t ¯
th signals strengths can be obtained
from ratios of other Higgs production signals strengths, since for example μ
γ γ
tth =
μ
γ γ
ggh
μ V V
ggh
μ
V V
tth . We conservatively assume no bottom quark Yukawa coupling shifts for
this plot (δy b = 0), in which we see that the parameter space region is a diagonal
band. We also show contours of the phase of the top Yukawa shift δy t , tracing the
band diagonally. The dependence is very sensitive to variations in the phase of the
shift of the top Yukawa coupling. We can clearly see that if the magnitude of the top
Yukawa deviation is less than 1 (the natural expectation for heavy KK top partners),
in order to obtain a signal enhancement (as hinted by LHC data), the phase must be
close to π .
M. Toharia
Fig. 3 Contours of the bottom quark Yukawa correction
δy b /y SM
b
with respect to the gluon
fusion signal strength μ V V
ggh and the ratio of the t ¯
th signal strengths μ bb
tth /μ V V
tth (left panel); and
dependence of the Higgs signal strength μ V V
tth with respect to the top quark Yukawa coupling
correction
δy t /y SM
t
(right panel). The Gray bands represent the experimental bounds set by the
LHC RUNS 1 and 2. The “Th. Excl.” region comprises all points excluded by the Brane Higgs
Limit constraint and we included (left) the two same parameter space points, marked by ⊕ and
as in the previous figure
After exploring the gluon fusion signals, we study the effect of small shifts in the
bottom Yukawa coupling in tth signals. In particular we focus on the behavior of
the ratios μ bb
tth /μ V V
tth = μ bb
V h /μ V V
V h as a function of μ V V
ggh (all top quark Yukawa
dependence cancels out in the ratio). This is shown on the left panel of Fig. 3,
where we consider variations of the ratio μ bb
tth /μ V V
tth with respect to the gluon fusion
strength μ bb
tth .
We now investigate the signals that do depend on the top Yukawa coupling
deviations. In the right panel of Fig. 3 we study the variation of μ V V
tth with respect
to the top Yukawa deviation |δy t |. The rest of t ¯
th signals strengths can be obtained
from ratios of other Higgs production signals strengths, since for example μ
γ γ
tth =
μ
γ γ
ggh
μ V V
ggh
μ
V V
tth . We conservatively assume no bottom quark Yukawa coupling shifts for
this plot (δy b = 0), in which we see that the parameter space region is a diagonal
band. We also show contours of the phase of the top Yukawa shift δy t , tracing the
band diagonally. The dependence is very sensitive to variations in the phase of the
shift of the top Yukawa coupling. We can clearly see that if the magnitude of the top
Yukawa deviation is less than 1 (the natural expectation for heavy KK top partners),
in order to obtain a signal enhancement (as hinted by LHC data), the phase must be
close to π .