TL;DR
This paper discusses the categorization of hadron discoveries, emphasizing the importance of understanding known and unknown aspects to explore the most elusive heavy-flavor hadrons.
Contribution
It introduces a framework inspired by Rumsfeld's quote to classify hadron discoveries and highlights the significance of studying known and unknown factors for advancing heavy-flavor hadron research.
Findings
Recent heavy-flavor hadron discoveries fit into Rumsfeld's categories
Understanding known and unknown aspects can guide future research
Lessons from known phenomena may help uncover unknown hadrons
Abstract
Donald Rumsfeld, in attempting to excuse the inexcusable, once (in)famously said that ``there are things that we know we know; there are things that we know we don't know; and then there are things that we don't know that we don't know". Recent discoveries about hadrons with heavy flavours fall into those categories. It is of course the third category that is the most tantalising, but lessons from the first two may help resolve the third.
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