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Oct 8, 2013, 3:55:10 PM (11 years ago)
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jkaspar
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v6

v7


11  11  Implemented in class `BHModel` (see in [[http://elegent.hepforge.org/doxygen/classElegent_1_1BHModel.htmlDoxygen]]). 
12  12  
13   There are two issues in the current implementation. First, the definition of `N_g` is incompatible between ![1] and ![2]. The one from ![1] seems correct. Second, using Eq. (478) from ![2] does not give reasonable dsigma/dt. However, if a factor of 1/2 is applied to the r.h.s. (see `BHModel::chi_without_i`) the results overlap with the published predictions from the original authors. There is an ongoing discussion with the authors in order to solve both issues. 
 13  There have been two issues discovered when implementing the model. 
 14  
 15  1. The definition of `N_g` is inconsistent between ![1] and ![2]. As confirmed in private communication with the authors, the correct normalisation is such that the average x carried by the gluons is 1/2  which is the case of the value published in ![1]. 
 16  1. Using Eq. (478) from ![2] does not give reasonable dsigma/dt. However, if a factor of 1/2 is applied to the r.h.s. (see `BHModel::chi_without_i`) the results overlap with the published predictions from the original authors (see a [[https://elegent.hepforge.org/comparisons/bh/bh_comparison.pdftest sheet]] with Elegent calculations in green). It is possible that the 1/2 factor was omitted due to confusion with the other 1/2 factor mentioned in point 1. 