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Unexpected particles in Event Display window. [message #18490]

Sun, 13 September 2015 13:07

Ajay Kumar
Messages: 102
Registered: December 2011
Location: indore

continuous participant

From: 14.139.35*

Dear All,

I have simulated two decay reactions using EvtGenDirect at just production threshold. These are the reactions.

pbar p -> J/psi pi+ pi- -> e+ e- pi+ pi- (beam momentum = 5.049089 GeV/c and just above at 6.0 GeV/c).
pbar p -> D*+ D*- -> D0 pi+ D0bar pi- -> K- pi+ pi+ k+ pi- pi- (beam momentum = 7.618268 GeV/c and just above at 8.0 GeV/c).

After that, I had a look on particle tracks in the eventDisplay window and observed that some unexpected particles like Deutron, Alpha, Triton, neutron, antineutron, muons, gammas are present there which I did not expected from EvtGenDirect by defining a decay file for particular decay.

To cross check for these additional particles, I created output.evt files using the same decay files then inside the output.evt file everything looks OK as I expected.

Is this behavior of EvtGenDirect is normal?
Will these additional particles harm the reconstruction of these decays?

Kindly help me in this regard.

I have attached simulation macros, decay files and snap shot of eventDisplay window.

Attachment: sim_complete.C
(Size: 7.84KB, Downloaded 402 times)
Attachment: digi_complete.C
(Size: 4.67KB, Downloaded 389 times)
Attachment: recoideal_complete.C
(Size: 4.77KB, Downloaded 388 times)
Attachment: pid_complete.C
(Size: 3.82KB, Downloaded 371 times)
Attachment: jpsipi-pi+_e+e-.dec
(Size: 0.11KB, Downloaded 414 times)
Attachment: jpsi_pippim_output.evt
(Size: 68.94KB, Downloaded 407 times)
Attachment: SnapShot_EventDisplay.png
(Size: 133.32KB, Downloaded 457 times)