Jason Mueller Louisiana State University. Overview What is v 2 Bulk v 2 Jet v 2 Methods for calculating jet v 2 Standard method QA method

Testing the QA Method for Calculating Jet

Jason MuellerLouisiana State University

Overview What is v2

Bulk v2 Jet v2

Methods for calculating jet v2 Standard method QA method

Simulations Results Conclusions

Jason Mueller - QA Method for Calculating Jet v2

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Bulk v2 Soft component of Pb-Pb collisions Hydrodynamic flow Elliptical overlap region

3 Jason Mueller - QA Method for Calculating Jet v2

Jet v2

Jets emitted isotropically Lose energy to QGP as function of

pathlength Jet v2 is the correlation of the jet axis

with the event plane. Information about jet-QGP interaction


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EP bias v2

overestimation

Standard method


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Standard method Solutions to EP-bias problem

Remove all particles from jet cone Remove certain ranges


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QA method Account for jets, don’t remove them Assumes we can reconstruct jets well


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bulkjet

�⃑�=�⃑�+ �⃑�

QA methodCalculate a few higher order moments,assume and are Gaussian,and solve a system of equations… We may also calculate now

where


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Simulations Real Pb-Pb events from 2011 PYTHIA jets Charged jets reconstructed before

embedding Event plane and calculated with

No jets Background + Jets Background + Jets & 2 GeV track cutoff QA method


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Results


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Jets embedded randomly Simulated

Standard method overestimates

QA requires a lot of statistics


Events weighted with Similar trends as before


Conclusions

Jet can give us useful information about how jets interact with QGP.

Jets bias event plane QA method functions well in simple

simulations if jets can be reconstructed accurately. Requires a lot of statistics


Best part of the trip


Questions?

References


A. Ohlson, Phys. Rev. C 89, 034909 (2013).

Documents

Jason Mueller Louisiana State University. Overview What is v 2 Bulk v 2 Jet v 2 Methods for calculating jet v 2 Standard method QA method