PhysicsValidation < BES/BOSS

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---+++ Three physics processes and related physics distribution checked
   * Reconstruct real data
   * Simulate single particles with generator tester
   * Simulate J/psi-&gt;rho pi with generator BesEvtGen
---+++ Status:
   * No difference in the reconstruction
   * Almost the same in the simulation with high statistics for three instances
---+++ Histograms for comparisons:
<img width="400" alt="aa" src="%ATTACHURL%/distribution.jpg" height="460" />
---+++ PDF files for comparisons:
---+++ Problems found:
----++++ Real data reconstruction job with 6.5.5 on SLC4_32bit machines can't get the same results as on SLC5_64bit machines.
Main Reasons: (1) the parameters have not been properly initialized
                        (2)  the functions have not set proper return.

Examples:

(1) EsTimeAlg/src/EsTimeAlg.cxx
double ttof[30]={0.},helztof[30],mcztof,forevtime,backevtime;
changed to:
double
ttof[30]={0.},helztof[30]={0.0},mcztof=0.0,forevtime=0.0,backevtime=0.0;

double cor_evtime,corev[15],tmp_time=0.; changed to:
double cor_evtime=0.,corev[15]={0.0},tmp_time=0.;

(2)MdcDedxAlg/src/MdcDedxRecon.cxx
add zhit_pol = 0.0; in MdcDedxRecon::execute() and MdcDedxRecon::kaltrackrec

add in MdcDedxRecon::execute() :
else
  continue;
to avoid push_back resdedx which not set initial value.
dedxList->push_back( resdedx );

(3)TrkReco
src/TMDCTsf.cxx
int nHits[4]; //in each layer.
changed to:
int nHits[4]={0,0,0,0}; //in each layer.

src/TCurlFinder.cxx
TTrack* TCurlFinder::merge3DTrack

at the end of the member function, at :
return track;



-- Main.ZhangXiaomei - 2010-10-25

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jpg	distribution.jpg	r1	manage	59.7 K	2010-10-25 - 13:16	ZhangXiaomei

Topic revision: r2 - 2011-04-28 - ZhangXiaomei

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