Many particles have already been discovered at the Large Hadron Collider (LHC, France-Switzerland). Now physicists say they have found evidence for three never-before-seen combinations of quarks: a pentaquark and a pair of tetraquarks.
The list of discovered particles a(LHC, France-Switzerland) is long. There is the famous Higgs boson, of course. But also about 65 hadrons. And today there are no fewer than three new items that are added to it. A new pentaquark and the first pair of tetraquarks ever detected.
To understand, remember that thewhat are the have the habit of associating in twos or threes. They thus form hadrons, among which the and the who are quite familiar to us. But sometimes – much rarer – quarks accumulate by four or even five. To form exotic hadrons called tetraquarks and pentaquarks respectively.
A pentaquark and a pair of tetraquarks
The pentaquark discovered this time around is unique in that it is the first to incorporate an s quark. Understand, aof flavor – here’s how to qualify the different types of existing quarks; they know six – ” strange “ os for “strange”. much more “classic”this pentaquark also contains a c – per quark “charm” – and its antiquark, a – for “on” – is one – for “down”.
The two observed tetraquarks form a pair. It’s the first time thatdetect one. One of the pair’s tetraquarks has a double electrical charge. The other is neutral. Both correspond to what researchers call a tetraquark apparent. Understand that these tetraquarks are made up of a c quark – but also an antiquark s, a u quark, and an antiquark d – without its antiquark.
And for those wondering, here’s what Chris Parkes, the spokesperson for the collaboration with LHCb, replies: “Finding new types of tetraquarks and pentaquarks and measuring their properties will help theorists develop a unified model of exotic hadrons – as isolated units of tightly bound quarks or as pairs of loosely bound hadrons, similar to-, but also to better understand the classical hadrons. “