Monte Carlo Asymmetries
Updated on Sat, 2008-09-27 10:58. Originally created by kocolosk on 2008-09-27 09:46.Here are the asymmetries for STD, ZERO, GS-C, and MIN that I get out of PYTHIA with the minbias trigger condition applied:
Figure 1: raw minbias asymmetries
and here’s what I get after applying the pT reweighting:
Figure 2: minbias asymmetries after reweighting jet pT spectrum
Figure 3: jetpatch asymmetries
Figure 4: difference between Figures 3 and 1
Figure 5: difference between Figures 3 and 2
Finally, these four plots show the effect of the minbias pT reweighting on the bias systematic for each scenario:
Reweighting the MB pT spectrum
Updated on Sat, 2008-09-27 09:07. Originally created by kocolosk on 2008-09-27 08:38.
Subprocess Fractions
Updated on Sat, 2008-09-27 08:33. Originally created by kocolosk on 2008-09-27 08:31.
Study of ET Correction Factor Single Thrown Particle
Updated on Thu, 2008-10-02 17:24. Originally created by pagebs on 2008-09-26 18:05.ET Correction Factor Study using Single Particles
JP1 & JP2 Turn on efficiency
Updated on Fri, 2008-09-26 12:46. Originally created by mattheww on 2008-09-26 12:46.I used the 2006 MuDsts to generate the turn on curves for the JP1 and JP2 triggers. Both plots are integrated over all jet patches.
Hermes alignment system
Updated on Fri, 2008-09-26 09:42. Originally created by sowinski on 2008-09-26 09:42.Hermes ref
W Program talk for SPIN 2008
Updated on Sun, 2009-01-11 00:39. Originally created by sowinski on 2008-09-25 10:59.Draft for practice talk at analysis meeting
spin goals run 9 draft talk
Updated on Wed, 2008-09-24 21:59. Originally created by sowinski on 2008-09-24 21:59.Draft of run 9 goals attached
Mean pT in z bins
I looked into the mean transverse momentum for pions and jets in each of my z bins. First, here’s a comparison of data (black points) and Monte Carlo (red lines) for the BJP1 trigger:
It looks good to me, so I went on to compare simulations for jet patch and minimum-bias triggers:
In hindsight, this plot makes perfect sense — the trigger hardens the pT spectrum for the jets, so each JP z bin (which integrates over 10-25 GeV) has a higher average jet p_{T} than the MB version.
Now, this 3 GeV p_{T} shift means that we’re biasing the sample in each z bin towards higher x. This is almost certainly the source of the observed trigger bias in the Monte Carlo asymmetries for π+. So, what’s the next step?