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Re: D+ and D- vertex resolution from Psi analysis [message #12292 is a reply to message #12288] Tue, 19 July 2011 09:34 Go to previous messageGo to previous message
StefanoSpataro is currently offline  StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
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Donghee Kang wrote on Mon, 18 July 2011 17:12

Dear all,

I have tried the test production with STT mode to see the quality of D+ and D- reconstruction.
Total 0.5 M events was generated and D+ and D- was well reconstructed with combined STT.

Which code/release have you used to generate those events? We have recently changed the macros (which are updated on grid but not in svn) and the release.


Vertex distribtuions and mass distributions show the displacement and smearings can be correctly handled after reconstruction and using vertex fit, it seems that the resolution can be identified in the level of 0.15cm for x,y position, for z-position the resolution should be found roughly within ~0.38 cm.

In the eta_c channel I have seen resolution values below 100 microns, for this I think you have used some old reconstruction code or some old settings, but I have not yet checked the psi channel.


But unfortunately, the vertex fit doesn't show good results for further reconstruction of psi3770.

I think this is a matter of implementation of the analysis macro.


So now I want to see the rate of correctly reconstructed psi with matching MC true information. In that case, 0.1 M event is too small to check the resolution of psi and each decay products. (an example is shown in the plot of Dmeson_mass_distribution at 3rd coloum)

The counts seem enough. How much efficiency do you have in this channel? And what do you mean by "each decay products"?


I would like to ask you some amount of data samples for Psi3770(-> D+D-) analysis at gridka.
Currently 0.1 M events are given, but
at least factor 2 times more data (~0.2M) samples are required to test of it.
Is it possible to increase data sample during Psi3770 production?

I don't know about gridka (yiou ahev to ask them), but in our grid we have first to understand the performance with 100k events, before increasing the statistics (i.e. your poor vertex resolution). I think 100k evts is enough for our analysis, and we have also to run other reconstruction channels instead of focusing only into one.
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