====== TTP08-07 Modelling light-cone distribution amplitudes from non-relativistic bound states ======
 
 
   <hidden TTP08-07  Modelling light-cone distribution amplitudes from non-relativistic bound states > We calculate light-cone distribution amplitudes for non-relativistic 
 bound states, including radiative corrections from relativistic gluon 
 exchange to first order in the strong coupling constant. 
 We distinguish between bound states of quarks with equal (or similar) 
 mass, m_1 ~ m_2, and between bound states where the quark masses are 
 hierarchical, m_1 >> m_2. For both cases we calculate the distribution 
 amplitudes at the non-relativistic scale and discuss the 
 renormalization-group evolution for the leading-twist and 2-particle 
 distributions. Our results apply to hard exclusive reactions 
 with non-relativistic bound states in the QCD factorization approach 
 like, for instance, (B_c -> eta_c l nu) or (e^+ e^- -> J/psi eta_c). 
 They also serve as a toy model for light-cone distribution amplitudes 
 of light mesons or heavy B and D mesons, for which certain 
 model-independent properties can be derived. In particular, we 
 calculate the anomalous dimension for the B meson distribution 
 amplitude phi_B^-(w) in the Wandzura-Wilczek approximation and derive 
 the according solution of the evolution equation at leading logarithmic 
 accuracy.
 </hidden>
|**Guido Bell and Thorsten Feldmann**  | 
|**  JHEP   0804 061 2008  **  |
| {{preprints:2008:ttp08-07.pdf|PDF}} {{preprints:2008:ttp08-07.ps|PostScript}} [[http://arxiv.org/abs/0802.2221|arXiv]]   |
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