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A detection at the Large Hadron Collider of a light Higgs pseudoscalar would,if interpreted in a supersymmetric framework, be a smoking gun signature ofnon-minimal supersymmetry. In this work in the framework of the Next-to-MinimalSupersymmetric Standard Model we focus on vector boson fusion andHiggs-strahlung production of heavier scalars that subsequently decay intopairs of light pseudoscalars. We demonstrate that although these channels havein general very limited reach, they are viable for the detection of lightpseudoscalars in some parts of parameter space and can serve as an importantcomplementary probe to the dominant gluon-fusion production mode. We alsodemonstrate that in a Higgsfactory these channels may reach sensitivitiescomparable to or even exceeding the gluon fusion channels at the LHC, thuspossibly rendering this our best option to discover a light pseudoscalar. It isalso worth mentioning that for the singlet dominated scalar this may be theonly way to measure its couplings to gauge bosons. Especially promising arechannels where the initial scalar is radiated off a W as these events haverelatively high rates and provide substantial background suppression due toleptons from the W. We identify three benchmark points that well represent theabove scenarios. Assuming that the masses of the scalars and pseudoscalars arealready measured in the gluon-fusion channel, the event kinematics can befurther constrained, hence significantly improving detection prospects. This isespecially important in the Higgs-strahlung channels with rather heavy scalars,and results in possible detection at 200/fb for the most favoured parts of theparameter space.

Detection prospects of light NMSSM Higgs pseudoscalar via cascades of heavier scalars from vector boson fusion and Higgs-strahlung