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Psi3770 study [message #12181]

Fri, 01 July 2011 16:19

donghee
Messages: 385
Registered: January 2009
Location: Germnay

first-grade participant

From: *kph.uni-mainz.de

Hi all,

I have a look the Psi3770 data on the gridka.
The names are psi3770 run701 and run705.
I'm not still clear the unit of vertex position.

In the plot of "invariant mass of D.eps", D+ and D- are shown from the reconstruction with combination of charged particles.
And following bottom plots, I have found MC true matched D+ D- mass distributions.

And corresponding decay vertex distributions are compared with generated true values in "vertex position of Dmeson.eps".
Upper two plots are true D+D- vertex.
Below two are reconstructed one after matching MC true association.
In here, y(y-axis) vs z(x-axis) position are plotted.
What is the unit of that?

Thanks...

Attachment: Invariant_Mass_of_D.eps
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Attachment: vertex_position_of_dmeson.eps
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Re: Psi3770 study [message #12182 is a reply to message #12181]

Fri, 01 July 2011 17:02

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: *to.infn.it

The standard units are "GeV" for energy/momentum and "cm" for position/lenght.

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Re: Psi3770 study [message #12184 is a reply to message #12181]

Fri, 01 July 2011 22:43

donghee
Messages: 385
Registered: January 2009
Location: Germnay

first-grade participant

From: *dip.t-dialin.net

Hi all,

I'm slightly confusing for decay vertex.

z-position of D+ or D- should be positive, but data show even negative z, is it possible?

What about vertex smearing in the data, is it applied to the simulation, already?

Then I can understand the shape of D vertex, otherwise the distribution couldn't explain any more in my knowledge.

Thank you!

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Re: Psi3770 study [message #12185 is a reply to message #12184]

Sat, 02 July 2011 01:38

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: *21-79-r.retail.telecomitalia.it

If you are using tdrct macros, then you have vertex smearing, 1 mm on x & y, 5/2.35 mm on z

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