*** Two-photon physics in the B-factories Physics Book ***
                            (Revised August 24, 2010, S.Uehara)

1. General descriptions for two-photon studies (4 pages)
 - Cross section measurement for gamma gamma incident particles(notag)
     Equivalent photon approximation for two-photon collisions
     Kinematical properties and  selection techniques
 - Resonances
     Quantum numbers of meson resonances produced by
     two-photon formation processes
     Importance of the two-photon partial decay width
      in meson spectroscopy
 - Single-tag measurements
     Physics, transition form factors
     Kinematical properties and  selection techniques    
 - Monte Carlo
     Basic laws and some techniques, implications

2. Meson-pair production (4 pages)
    Belle's measurements for pi+pi-, pi0pi0, K+K-, KsKs, 
           eta eta, eta pi0, (also D-Dbar ?)  
  - Light-quark meson resonances
    - confirmation of f_0(980) and a_0(980) production
    - other f or a mesons with spin-0, 2, 4      
  - QCD studies
    W and angular dependences, cross-section ratios
    and predictions from QCD models.

3. Baryon-pair production (1 page)
   - p pbar only so far from Belle

4. Charmonium formation  (3 pages)
   This could overlap with the "XYZ" topics and
  charmonium properties: But, it should be better to discuss and 
  summarize here about two-photon decay widths of
  charmonium(-like) particles: eta_c(1S), chi_c0,
  chi_c2, eta_c(2S), chi_c2(2P)(Z(3930)) and X(3915).


5. Form factor measurements with single-tag processes (3 pages)
  - pi0 formation (measurement of the transition form factor) 
    from BaBar
  - Q^2 dependence of eta_c(1S) production in gamma*-gamma
    process from BaBar

                   (total 15 pages)