Michael, The two plots the left & right multiplicity respectively, For 200 GeV I see the hit distributions peak near the #tubes ie. 42 and 32 for the L,R The mean is much lower, as well as the width. I will try, though not today to make a Hit dist vs Centrality. Note also this is a geant simulation (including background) , and I noticed that the time-distributions seem wider than I recall from before. Regards ------------------------------------------------------ Flemming Videbaek Physics Department Brookhaven National Laboratory tlf: 631-344-4106 fax 631-344-1334 e-mail: videbaek@bnl.gov ----- Original Message ----- From: "Michael Murray" <murray@CyclotronMail.tamu.edu> To: <brahms-l@bnl.gov> Sent: Monday, November 19, 2001 11:07 PM Subject: Re: run status > Dear Flemming, > in your plot I presume that the left hand plots > are 22GeV and the right ones (with high statistics) 100GeV. The > mean multiplicities seem to be almost equal in both tubes. > So I don't understand why you said their were 1/3 as many hits. > Yours Michael > > > > > I regard to the 22 GeV running the proposal for running is > > - change ZDC HV to accomodate for lower gain. Since the beam will not be > > rebunched just take data with trigger 1 i.e. BB(L) BB(R) coinc. > > this has a resonmable effeciency, but will clearly drop off for less > > central coll. I attach a simulation for 22 GeV Hijing hit multiplicity > > for > > central BBL and BBr. The #hits is ~1/3 at 200 geV, but do also have > > wider fluctuations. Never the less it looks resonable efficient for > > those collisions. > > > > regards > > Flamming > > ------------------------------------------------------ > > Flemming Videbaek > > Physics Department > > Brookhaven National Laboratory > > > > tlf: 631-344-4106 > > fax 631-344-1334 > > e-mail: videbaek@bnl.gov > > > > > > Michael Murray, Cyclotron TAMU, 979 845 1411 x 273, Fax 1899 >
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