Summary of the analysis of the energy deposited per particle at the mid-rapidity region (addendum to the previous reports on the analysis of the PMC simulations) Barbara.Wosiek@ifj.edu.pl March 25,1999

This is a summary of the analysis of energy deposited per particle at midrapidity. Energy deposited is studied for tracks with -2 <= eta < 2 and only for those which hit Octagon sensors.
In this report the effects of different cuts ('truncations') on the deposited energy are summarized.
The following cuts have been applied:

A.    if(Edep > 1000 keV) Edep = 1000 keV
B.    if(Edep >   500 keV) Edep =   500 keV
C.    Edep <= 1000 keV
D.    Edep <=   500 keV
E.    20 <= Edep <= 500 keV

In each case and for i-th sample the correction factor f_iwas calculated:

f_i= (P/TH)_i * <Edep>_i^-1.

Assuming that the multiplicity reconstruction is tuned to the Hijing central events, one can calculate:

errN = (N_true - N_rec)/N_true= (f_i - f_{Hijing-central})/f_i.

The Table I contains the errN values obtained with the calibration to the Hijing central events.

**Table I. errN(%) - tuning to the Hijing-central**
Sample	A	B	C	D	E
Hijing inclusive	-2.8				-0.8
Hijing semi-central	-2.4				-0.8
Hijing central	0	0	0	0	0
Hijing plasma 15%	+6.4				+4.3
Hijing plasma 30%	+12.1	+10.5	+9.5	+7.6	+7.6
Hijing HBT	-1.2				-0.4
Venus central	+11.6	+9.6	+7.9	+5.8	+5.8

Now, the estimates of errN , with the tuning to the Venus central:

**Table II. errN(%) - tuning to the Venus-central**
Sample	A	B	C	D	E
Hijing inclusive	-16.3				-7.0
Hijing semi-central	-15.9				-7.0
Hijing central	-13.2	-10.6	-8.6	-6.2	-6.2
Hijing plasma 15%	-5.9				-1.7
Hijing plasma 30%	+0.5	+1.1	+1.7	+1.9	+1.9
Hijing HBT	-14.5				-6.6
Venus central	0	0	0	0	0

Summarizing, cuts D or E and tuning to the central Hijing events gives the best results for the reconstruction of mid-rapidity multiplicities for different data samples.