Ξ b -aryon
|
Ξ b 0 -Baryon |
|
|---|---|
| classification | |
|
Fermion Hadron Baryon |
|
| properties | |
| electric charge | neutral |
| Resting energy | 5791.9 ± 0.5 MeV |
| Strangeness | −1 |
| Beauty | −1 |
| average lifespan | (1.479 ± 0.031) 10 −12 s |
|
Quark composition |
usb |
|
Ξ b - -Baryon |
|
|---|---|
| classification | |
|
Fermion Hadron Baryon |
|
| properties | |
| electric charge | −1 e (−1.602 · 10 −19 C ) |
| Resting energy | 5794.5 ± 1.4 MeV |
| Strangeness | −1 |
| Beauty | −1 |
| average lifespan | (1.571 ± 0.040) 10 −12 s |
|
Quark composition |
dsb |
The Ξ b baryon ( English also Cascade b or Xi sub b ) is a baryon . It consists of a strange quark , a bottom quark and an up or down quark.
discovery
The extremely short-lived Ξ b - particles of about six times the proton enmasse in 2007 at Fermilab discovered. It is therefore the first detected elementary particle that consists of the quarks of all three generations, namely a down quark, a strange quark and a bottom quark.
The neutral Ξ b 0 particle was first observed in July 2011, also at the Fermilab.
See also
Individual evidence
- ↑ a b The information on the particle properties (info box) are, unless otherwise stated, taken from: C. Patrignani et al. ( Particle Data Group ): 2017 Review of Particle Physics. In: Chin. Phys. C, 40, 100001 (2016) and 2017 update. Particle Data Group, accessed May 23, 2018 .
- ↑ Frank Grotelüschen: Strange three-way relationship - US physicists discover a new exotic particle
- ^ Fermilab, Press Release: Fermilab physicists discover "triple-scoop" baryon