Lecture.2 - Ei Eightfold Way (old model) GELL MANN -...

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Eightfold Way (old model) GELL MANN - NISHIJIMA FORMULA RELATING CHARGE TO ISOSPIN Q = I 3 + ½( B + S ) B = baryon number, S = strangeness Q = charge (in units of e, the electronic charge) Y = B + S was called hypercharge. I = “z component” of ISOSPIN 3
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o in Iso Spin was discovered that particles with It was discovered that particles with approximately the same mass, and the same (ordinary) spin existed in “charge multiplets”: p and n I 3 = ½, ½ (a doublet) + 0 = 1 0 triplet) I 3 1, 1, 0 (a triplet) number of states = 2I +1
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quark triplets ell ann and others proposed that one Gell Mann and others proposed that one might build all the experimentally observed particles from just three quarks : the up , the down and the strange . One way to “build” the particles is to think of the quarks as vectors in a two dimensional “imagined” space with Y along the vertical axis and I 3 along the horizontal axis. The quark triplet is shown on the next slide.
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Lecture.2 - Ei Eightfold Way (old model) GELL MANN -...

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