3 ms·

can this be explained in terms of quark-color theory or is that unrelated to this phenomenon?

• gus_massa 13y ago
  (If it exists, and they have the correct model ...) This particle is composed by 2 quarks and 2 antiquarks. One possible combination of the colors is painting the 2 quarks red and the 2 antiquarks antired, so the total color is "0". Another possibility is 1 red and 1 blue quarks and 1 antired and 1 antiblue aniquarks. There are many combinations but it's possible to combine them in a way that the total color is "0". (Inside the particles, they interchange the color "constantly", so the exact colors don't mater.) (There are some technical details, that involve the symmetry properties, but this is the main idea.) The problem is that this system can split in two subsystems with total color "0" (for example, a pion and a J/psi mesons, or two D mesons. Each one of them is composed by a quark and an antiquark with opposite colors. The exact decomposition depends on the details of the theory. The discussion is if this is a real particle or are only two D mesons traveling together. An easy conclusion from the color theory is that we will never [1] see particles with for quarks, because it's impossible to sum 4 colors and get "0". This proposed particle has 2 quarks and 2 antiquarks, so it's possible but no particle of this kind has been confirmed. [1] (unless we use an incredible^10 amount of energy, and perhaps neither in that case)