CERN sees the “Pentaquark” for the first timeScientists at the LHC (large hadron collider) / CERN have made a new discovery. They have observed a rare particle combination (called a “pentaquark”) for the first time.
Diagram from CERN (left is the assembled 3D “pentaquark” taking the shape of a pentagram – right is the sub-components of the particle(s)
|Image from Physics World|
https://www.google.com/search?q=pentaquark&num=50&source=lnms&tbm=isch&sa=X&ved=0CAgQ_AUoAmoVChMIrLbistvfxgIVVI6SCh2OGQlv&biw=1920&bih=918“A pentaquark is a hypothetical type of subatomic particle consisting of four quarks and one antiquark bound together.
As quarks have a baryon number of +1⁄3, and antiquarks of −1⁄3, it would have a total baryon number of 1, thus being classified as an exotic baryon. By contrast, regular baryons (or ‘triquarks’)—which also have a total baryon number of 1—consist of three quarks.
The name pentaquark was coined by Harry J. Lipkin in 1987, although the possibility of five-quark particles was identified as early as 1964 when Murray Gell-Mann first postulated the existence of quarks.
Although predicted for decades, pentaquarks have proved surprisingly difficult to discover, and some physicists were beginning to suspect that an unknown law of nature forbids their production.
The first claim of pentaquark discovery was recorded at LEPS in Japan in 2003, and several experiments in the mid-2000s also reported discoveries of other pentaquark states. However, others were not able to replicate the LEPS results, and the other pentaquark discoveries were not accepted because of poor data and statistical analysis. On 13 July 2015, the LHCb collaboration at CERN reported results consistent with pentaquark states in the decay of bottom Lambda baryons (Λ0b).
|Image From Science Network 4|
|Image Source - The Ultimate Curiosity|
Baryons are massive particles which are made up of three quarks in the standard model.