From Scientific American, Feb. 26, 2016: Evidence for a never-before-seen particle containing four types of quark has shown up in data from the Tevatron collider at Fermilab.
DZero
From Gizmodo, Feb. 25, 2016: Physicists from the DZero collaboration have announced the discovery of a new particle, believed to be part of an exotic family called “tetraquarks.”
DZero announces the newest member of the tetraquark family.
DZero discovers a new, exotic particle made up of four different quarks.
The DZero experiment will present a special Wine and Cheese seminar, “Observation of a new resonance state in the Bs pi system” this Thursday, Feb. 25, at 4 p.m. in One West. The seminar will be video streamed at http://vms.fnal.gov/asset/livevideo and the slides will be posted at http://theory.fnal.gov/jetp/. Mark your calendar to attend!
It’s hard to believe that point-like particles have spin. Yet that’s exactly what DZero recently measured – the spin of top quarks – to learn more about the details of top quark pair production.
DZero has made the first measurement of the effective cross section in J/ψ-plus-Υ events
Protons have parts that, as mentioned in previous columns, have the not terribly imaginative name of “partons.”
Determining the precise details of how the strong nuclear force assembles quarks into hadrons is not always easy. Disponible en español Method A: 3 quarks chromodynamic glue Step 1. Glue the quarks together. Step 2. Voila! Method A will produce a baryon; most of your more massive hadrons are baryons. The type of baryon will be determined in part by the flavor of the quarks used and how the quarks are aligned. For example, if you have glued together one…
This week saw a historic collaboration between scientists from CERN and Fermilab, as the world combination of the top quark mass was reported, using inputs from the ATLAS, CDF, CMS and DZero collaborations. Disponible en español The top quark has only ever been produced and detected in two places on Earth: at Fermilab, where the DZero and CDF collaborations first discovered this most massive particle in 1995, and at CERN, where the Large Hadron Collider generates so many top quarks…