Post

28 Mar

We haven't measured it yet. The doubly charged one has 256 femtoseconds. This one is a bit shorter. But it's still long lived enough to fly a few millimetres in the detector.

This one is special. There are only two weakly decaying new hadrons found at the LHC. The other one is the doubly charged partner of the newly observed Ξcc⁺. That makes a pretty boring plot. All the other ones are at www.koppenburg.ch/particles.html

Peter Denton

@jazzwhiz.bsky.social

Boring plots are sometimes the most important plots

The Ξcc⁺ was already "discovered" by the SELEX experiment at Fermilab in 2002. However at a mass that is at odds with predictions and with the mass of the doubly charged Ξcc⁺⁺. I don't know what they have seen , but it's not the Ξcc⁺.

More context: bsky.app/profile/fitz...

Conor Fitzpatrick@fitzparticle.bsky.social

Xi_cc+ in the Guardian, noting that cuts from @ukri.org will prevent future discoveries like this.