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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]] | | ||

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