@AkaSci

Since it's a weak decay (via the 𝑊⁺ boson), I'd have expected a slightly longer lifetime.

Singly charmed baryons seem to flame out after about 10⁻¹²−10⁻¹³ sec. So this one, doubly charmed, is arguably 10x faster?

I wanted to compare it to its sibling \( \Xi_{ccu}^{++} \) (below), but the quotes for lifetime were maddeningly vague (10⁻¹²−10⁻¹⁴ sec). So they could be consistent, I guess.

The family tree (below), causing me to wipe away a happy tear of nostalgia, is the \( SU(4)_{\mbox{flavor}} \) generalization of the \( SU(3)_{\mbox{flavor}} \) symmetries of my mis-spent youth back in the early 70s.

@AkaSci

I took my particle physics exam 30+ years ago and never touched the subject again. Nevertheless, I wonder if we should call these things particles, or just some a bit more stable resonances, or whatever fancy word one can think of in order to get a grant approved.