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 FirstRealData.py 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:

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

Real

Using the attched Bender script RealPi0.py one can easily produce the plot for "the first real ":

Add a cut on the transverse momentum:

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

Real mip peak

Using the attched Bender script RealMip.py 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 RealMip.py 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:

-- Vanya Belyaev - 26-Nov-2009