An introduction to the quark model

More documents

Recommendations

Info

Few-charge systems History of the quark model Mesons Baryons Multiquarks and other exotics Outlook Light mesons In principle, the quark model not applicable Though this was attempted! Two examples: First positive-parity excitations of (q¯q) with I = 1 are a0(980), b1(1235), a1(1260) and a2(1320). In the quark model, they correspond to the partial wave 3 P0, 1 P1, 3 P1 and 3 P2. Same pattern as for charmonium 1P. Regge trajectories M 2 vs. J Linear behaviour reproduced with relativistic kinematics and V ∝ r JMR Quark Model
Few-charge systems History of the quark model Mesons Baryons Multiquarks and other exotics Outlook Heavy-light mesons Most dangerous sector Remember: electron more relativistic in H than in Ps Nevertheless, some properties of the naive quark model applied to (Q¯q) survive. Reduced mass 1 µ = 1 1 + m M dominated by the light quark. 1 m , Thus universal excitation energies and wave functions One aspect of Heavy quark symmetry Spin effects ∝ 1/M D ∗ − D = 2010 − 1870 = 140 MeV B ∗ − B = 5325 − 5280 = 45 MeV JMR Quark Model
Page 1 and 2:
Few-charge systems History of the q
Page 3 and 4:
Page 5 and 6:
Page 7 and 8: Few-charge systems History of the q
Page 57: Few-charge systems History of the q
Page 109 and 110:
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
Page 117:
show all

An introduction to the quark model

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?