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Efficiency factor in electron linewidth calculation http://epwforum.uk/viewtopic.php?f=7&t=1132 
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Author:  Shouhang [ Fri May 10, 2019 3:40 am ] 
Post subject:  Efficiency factor in electron linewidth calculation 
Dear EPW users, I read the paper “EPW: Electron–phonon coupling, transport and superconducting properties using maximally localized Wannier functions” which is published on CPC. I found in (8) and (9), you do not include the efficiency factor, which is defined as following \eta=1cos\theta_{k,k+q}=1\frac{v_{k}\cdot v_{k+q}}{v_k^2} I checked the EPW code in version QE. 6.3 and I found for phonon linewidth, the efficiency factor is added and we can extract the phonon linewidth through the parameter gamma_tr. However, there is no efficiency factor for the electron linewidth calculation. Is this reasonable? I also checked other papers and I find other papers (PRB 94，155105 (2016) PRB 57， 11276 (1998)) considered the efficiency factor. Could you give some comments about this issue? Thank you in advance!  Rgds, Shouhang 
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