An introduction to the quark model

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Few-charge systems History of the quark model Mesons Baryons Multiquarks and other exotics Outlook Upsilon discovery In 1977, Lederman repeated Ting’s experiment with a more powerful beam and another detector, And discovered Υ and Υ ′ Immediately interpreted as (b ¯ b) See chapter on mesons, Already Lederman noticed Υ ′ − Υ ψ ′ − J.ψ, And asked local theorists about a potential such that all ∆E are independent of the reduced mass, Answer: V (r) ∝ ln r B mesons and B baryons also discovered, As well as Bc = (b¯c) JMR Quark Model
Few-charge systems History of the quark model Mesons Baryons Multiquarks and other exotics Outlook Exotic hadrons Already before the quark model, For instance, speculations about a Z baryon with S = +1 Within the quark model, exotic = state that cannot be accommodated as (q¯q ′ ), or (qq ′ q ′′ ). For instance meson with charm = +2, or baryons with S = +1 Besides flavour? for mesons, ∃ exotic J PC not for baryons question of best beam and target: e + e − clean but with some restriction ¯p annihilation formation or production, low energy or high energy past or recent excitations: baryonium, glueballs, hybrid hadrons, molecules JMR Quark Model
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An introduction to the quark model

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