> From: "Y. G. Ma" > Subject: Re: Reader for the new paper on the BES dependence of the charge separation > Date: March 15, 2014 at 12:04:33 PM GMT+8 > To: Nu Xu , Ma YuGang > Cc: Dong Xin , "Xu, Zhangbu" , Geurts Frank > > Dear Nu, > > We have some comments as follows: > (1) Because is related to v_1^2 term, > it will be better to mention what about the energy dependence of direct > flow. Though it is uncorrelated to magnetic field, but people are still > curious how big the BG term from direct flow is. PAs: The term is more related to v1 fluctuation than v1 itself. And for small signals like v1 and a_\pm, we assume their fluctuations rough cancel out in gamma. When they don't cancel, they contribute to the charge-independent background. This effect may be studied later in a longer paper with MEVSIM or other models. > (2) Are the MEVSIM results charge independent? PAs: Yes, and now we clearly mention that in the caption. > (3) It was already clearly shown that the dilution effect is due to final > state interactions from both partonic and hadronic evolutions in a recent > AMPT work [Phys. Lett. B700 (2011) 39-43]. Note that the total charge is > conserved in this work. It might be good to cite the paper in the > manuscript. PAs: Done. > (4)The authors did not give a clear explanation about the parameter \kappa > in Eq. (3), which could puzzle the readers since there are lots of > augments related to it in the manuscript. > PAs: The kappa is an empirical parameter which is introduced for better way of taking into account background contribution. kappa is 1 in the ref[29] we cited, and in our paper we don't want to rely too much on the assumption as the reference, so we allow kappa to vary, which make our Eq.(3) more correct. The verification of kappa allows to estimate quantitatively uncertainties in H-value. > Thanks and regards, > > Yu-Gang & SINAP team >