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preprints:2008:ttp08-07 [2016/03/17 11:03] (current)
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 +====== TTP08-07 Modelling light-cone distribution amplitudes from non-relativistic bound states ====== 
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 +   <​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]] ​  | 
 +| |