Hi Ian etc. now there are some plots in http://www.fi.uib.no/~yin/brahms/dAu/spectraFromDAu.html By the way I have update my draft for QM'04 on the web http://www.sdcc.bnl.gov/brahms/private/presentations/2003/QM04/index.html Some figures is subject to change or removed especially for dAu spectra, in which the yields are too high... Any ideas... Best regards, Zhongbao On Sun, 28 Dec 2003, Ian Bearden wrote: > Hi Zhongbao, > A couple of quick comments/questions...in line below: > On 28/12-2003, at 21.07, yin.zhongbao@fi.uib.no wrote: > > > Hello, > > > > I hope everyone will be back to work tomorrow :) > > > > What I found that the yields of charged particles from dAu and pp at > > midrapidty are much higher than other experiments (PHENIX, PHOBOS and > > STAR). For min-bias of dAu, the yields ~20% systematically higher than > > PHENIX published, while our published data is lower than PHENIX > > especially > > in low pt region. For 0-30% central dAu collision the yields I got even > > higher than that PHOBOS publilshed spectra from 0-20% central events. > > The > > reason I guess might be due to: scaledown correction and acceptance > > correction. I would appreciate you if you could provide me some idea or > > suggestion. > Do you have some plots showing this? In particular, it would be > interesting to see a comparison of your dAu spectrum > compared to the published dAu spectrum. > > > > For scaledown correction, it is clear that the inel trigger scaledown > > factor is vertex position and centrality dependent from a > > two-dimensional > > histogram. I think it is quite understandable since the inel trigger > > efficiency has weak centrality and vertex position dependence. > > Certainly > > if ignoring this weak dependence, the yield for central collisions > > will be > > lowered, but I think that not the right thing to do. I would appreciate > > if you could show your experience in how to deal with the scale down > > factor correctly or reasonablly. > again, it might be helpful to see the histogram to which you refer. > The trigger scaledown factor is a constant for a given run, isn't it? > I guess you mean that the trigger efficiency is a function of VTX Z and > centrality (as you also say). What is the dependence, and why is the > trigger less efficient for "central" collisions? > > > > I still doubt the acceptance map. The map generated from BRAG is very > > much > > different from map generated from Claus' pure geometrical method (the > > same cut on slats of tofw is applied). And the map from BRAG for B1000 > > is > > also very much different from that for B1050. The map generated from > > BRAG > > doesn't match data at all. Then I would think it the current is wrong, > > I > > mean much lower than 1050 actally, then the acceptance correction might > > be larger, then the yield will be lower. > I do not understand this. Djamel showed a couple of weeks ago that > BRAG and CLAUS give similar results, though I do not have the mail at > hand. Again, plots would be helpful. The fact that BRAG gives much > different results for B1000 and B1050 seems to me to be impossible, if > everything is working as it should. Are you sure you are comparing > maps from these settings? How can the current be wrong? When you say > "doesn't match data at all" what do you mean? sounds like you are > comparing data and MC from different settings, but I suppose you have > checked that? > > > > I would use constructed spectra from PHENIX pi^0 spectra for pp > > collisions+Pythia simulation as reference spectrum for R_AA of pi at > > both > > mid-rapidity and forward rapidity. > Why? And how can you use PHENIX at forward rapidity? How does this > ref. compare to the one we have used for > our published results? > > > > By the way I have re-studied the RICH efficiency via simulation for > > 12A427 > > with a fiducial cut applied on track intersetion with RICH mid-plane. > > The RICH > > efficiecy for pion at pt>3GeV/c is ~97% constantly. > Thanks for some good news...:-) > And thanks for the update, > Ian > > > > > > I will update my QM04 draf on the web tomorrow. > > > > Good night! > > > > Zhongbao > > > > > > On Sun, 28 Dec 2003, flemming videbaek wrote: > > > >> As per request, we have placed the first versions as has been send to > >> us so far on > >> http://www.sdcc.bnl.gov/brahms/private/presentations/2003/QM04/ > >> index.html > >> > >> Please send comments to presenter, speakers bureau to develop these > >> talks. > >> The goal is to follow the schedule given to the presenters of > >> > >> Dec. 22: "rough draft" of talks. Please send a ppt file to the > >> including figures you know you will show, and preliminary versions of > >> figures you hope to be able to make in time to show. > >> > >> Jan 3. Final draft ppt file, together with an outline of what you plan > >> to say > >> > >> Jan 7 "final" version of talk, including reasonable suggestions > >> > >> Week of Jan 7: Give "final" talk for local group (on Friday 9 the > >> plan is to have > >> the two us talks be given at BNL) > >> > >> Jan 11: (Sunday of QM) Monday/Tuesday speakers (I believe this is > >> Ramiro and > >> Michael) give rehearsal talk for other BRAHMS people at QM. > >> (IGB) will try to organize a location for this as well as the other > >> two talks > >> > >> On behalf os the speakers bureau > >> Flemming > >> > >> > >> ---------------------------------------------------------------- > >> Flemming Videbaek > >> Physics Department > >> Brookhaven National Laboratory > >> > >> e-mail: videbaek@bnl.gov > >> phone: 631-344-4106 > > > > -- > > ----------------------------------------------------- > > Zhongbao YIN Phone: +47-55-582792 (O) > > Address: +47-55-276803 (H) > > Fantoftveien 14G 466 E-mail: > > 5075 Bergen Yin.Zhongbao@fi.uib.no > > ------------------------------------------------------ > > > > > > _______________________________________________ > > Brahms-l mailing list > > Brahms-l@lists.bnl.gov > > http://lists.bnl.gov/mailman/listinfo/brahms-l > > > > -- ----------------------------------------------------- Zhongbao YIN Phone: +47-55-582792 (O) Address: +47-55-276803 (H) Fantoftveien 14G 466 E-mail: 5075 Bergen Yin.Zhongbao@fi.uib.no ------------------------------------------------------ _______________________________________________ Brahms-l mailing list Brahms-l@lists.bnl.gov http://lists.bnl.gov/mailman/listinfo/brahms-lReceived on Mon Dec 29 07:12:35 2003
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