Searching for secondary QGP in Jet


Week of April 6-13

*By the end of monday 13th: 2D JetPt vs Multiplicity plot.

* Submitted CRAB jobs with HLT Calo4 Jet100.

* Running 2D correlation binned in 85GeV increments of Jet Pt.

* Progress on RAW Data project: code compiling and giving sizes for different detector modules.

* Problem sets, class reading, class presentations.


Exit Code 50660 Some fraction of CRAB jobs fail with exit code 50660: Application terminated by wrapper because using too much RAM (RSS). Are we missing anything with these "big" sub-collections of events? Could these have the highest energy jets with the best chance of seeing correlation?

Number of Jets <100 neq zero I assume the HLT trigger is passed if there is any jet in the event gt 100GeV and that is why we still see some (still highest histogram peak) jets sub 100GeV. Is this a problem? does it mean I did not implement the HLT correctly?

1. To Do List

Run code on data.

Look at 2D corr as a set of 1D profile curves (see paper example).

Look at V2 (talk to Yousen).

Look at dN/dEta with proper normalization.

Consider appropriate ways to subtract wrong-axis 2D corr from correct signal.


3. References papers

Title Authors Year CADI line Paper link
Observation of Long-range Near-Side Angular correlations in Proton-Lead Collisions at the LHC CMS 2013   1210.5482
Observation of Long-Range Near-Side Angular Correlations in Proton-Proton Collisions at the LHC CMS 2010   1009.4122
Measurement of the charged-particle multiplicity inside jets from s√=8 TeV pp collisions with the ATLAS detector ATLAS 2016   1602.00988
Centrality dependence of dihadron correlations and azimuthal anisotropy harmonics in PbPb collisions at sqrt(s[NN]) = 2.76 TeV CMS 2013   1201.3158
Ridge correlation structure in high multiplicity pp collisions with CMS Velicanu, D. 2013   1107.2196
Jet properties in PbPb and pp collisions at 𝑠NN‾‾‾‾√=5.02 TeV CMS 2018   Jet properties PbPb and pp


4. Appendix Plots

Jet Pt vs nTrk

Jets grouped by Pt in bins of size 900/16 (0 to 900/16, 900/16 to 2 x 900/16 etc) with various theta acceptance cuts in addition to all kinematic cuts applied to 2D correlation analysis.

Things to observe:

-Larger theta acceptances have higher nTrk means (obvious)

-Narrow theta cuts show a positive relationship between increasing nTrk mean and increasing jet pt bin (logical)

-Wide theta cuts do not show a positive relationship between increasing nTrk mean and increasing jet pt bin. This is because the nTrk mean is dominated by the underlying event. (logical)



-- ParkerGardner - 2020-03-12

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