Abstract
A
bstract
We present a study probing the Higgs self-coupling with the X-ray free-electron laser Compton
γγ
Collider (XCC) concept. The analysis is performed considering the
γγ
→
HH
→
$$ bb\overline{bb} $$
bb
bb
¯
channel and results are then extrapolated to obtain a projection on the Higgs self-coupling sensitivity that ranges between 7% and 12%. An ensemble of boosted decision trees is trained to discriminate between signal and backgrounds, paired with a genetic algorithm optimizer to combine the final classifier outputs. This study suggests that an X-ray FEL-based
γγ
collider is a powerful tool to probe the mechanism of electroweak symmetry breaking complementary to
e
+
e
−
Higgs factories and future high energy hadron colliders.