Bender F.A.Q.

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Can Bender be used for analysis of REAL data ?

Yes! From the version v12r5 Bender really can be used for analysis of real data!

Beam-Gas events versus pp-Collisions

The script demonstrates that the summed transverse energy in Ecal allows to discriminate beam-gas events with respect to events with pp-collision. E.g. the plot shows "zPoca" distributions for Collision/BeamGas events (similar to the original plots by Wouter & Juan):


The same distribution for events with : one clearly sees the reduction of 'beam-gas' component:

etEcal gt 3.gif

The same distribution for events with : one clearly sees the reduction of 'collision' component:

etEcal lt 1.gif


Using the attched Bender script one can easily produce the plot for "the first real ":

new pi0.gif

Add a cut on the transverse momentum:

pi0 PT gt 400.gif

Use Spd/Prs infomration (no Spd hits, and require some energy Prs):

new pi0 spdprs.gif

Real mip peak

Using the attched Bender script one can easily produce the plot for "mip signal in Ecal" :


Changing the scale and adding comparison with Monte Carlo for 450 GeV pp-collisions (BLUE histogram) one gets the following plot, where data correspond to RED histogram:


E/P in Ecal

The same Bender script can be used to produce E/P-ratio for tracks (thanks to Victor Egorychev):


The "bump" sits at ~ 0.71, but if one re-uses the scaling coefficient from the previous plot ( the ratio of mip-peaks in DATA/MC) one gets following "energy corrected" plot:, where the bump sits at ~0.94:

EoverP corr.jpg

-- Vanya Belyaev - 26-Nov-2009

Topic attachments
I Attachment History Action Size Date Who CommentSorted ascending
JPEGjpg EoverP.jpg r1 manage 160.3 K 2009-12-10 - 09:21 VanyaBelyaev  
JPEGjpg EoverP_corr.jpg r1 manage 154.6 K 2009-12-10 - 09:23 VanyaBelyaev  
Texttxt r1 manage 11.7 K 2009-12-10 - 09:39 VanyaBelyaev  
GIFgif Mip.gif r1 manage 9.2 K 2009-12-10 - 09:08 VanyaBelyaev  
Texttxt r1 manage 12.2 K 2009-12-10 - 09:08 VanyaBelyaev  
Texttxt r1 manage 7.9 K 2009-12-09 - 21:42 VanyaBelyaev  
GIFgif etEcal_gt_3.gif r1 manage 9.9 K 2009-12-10 - 09:31 VanyaBelyaev  
GIFgif etEcal_lt_1.gif r1 manage 13.4 K 2009-12-10 - 09:32 VanyaBelyaev  
GIFgif mip2.gif r1 manage 9.8 K 2009-12-10 - 09:07 VanyaBelyaev  
GIFgif new_pi0.gif r1 manage 9.8 K 2009-12-09 - 21:41 VanyaBelyaev  
GIFgif new_pi0_spdprs.gif r1 manage 12.6 K 2009-12-09 - 21:41 VanyaBelyaev  
GIFgif no-cuts.gif r1 manage 9.9 K 2009-12-10 - 09:32 VanyaBelyaev  
GIFgif pi0_PT_gt_400.gif r1 manage 9.6 K 2009-12-09 - 21:41 VanyaBelyaev  
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Topic revision: r6 - 2009-12-10 - VanyaBelyaev
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