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A bit of history of particle physics that takes an unexpected turn today. In 2003 the BaBar experiment at SLAC reported a particle decaying to a Ds meson and a neutral pion, with a mass of 2317 MeV. arxiv.org/abs/hep-ex/0...

24/9/26, 9:00 am5 reposts10 likes

Patrick Koppenburg 🐧

@koppenburg.ch

They also saw a peak in the combination of a Bs meson, a pion and a photon, but were unsure what it was.

Patrick Koppenburg 🐧

@koppenburg.ch

I was at Belle in Japan at the time and we had the data to confirm this observation. So I wrote a quick analysis in the morning and after lunch I had a peak with 340 events (I no longer have the plot, sadly).

Patrick Koppenburg 🐧

@koppenburg.ch

Things went very fast. A week later the CLEO experiment confirmed the particle at 2317 MeV and also that at 2460. arxiv.org/abs/hep-ex/0...

Patrick Koppenburg 🐧

@koppenburg.ch

And in Summer Belle reported the quantum properties of the two particles arxiv.org/abs/hep-ex/0... and arxiv.org/abs/hep-ex/0... .