Title:
Differential jet shape measurement in \sNN = 200 GeV Au+Au collisions in STAR

Abstract:
The existence of the quark gluon plasma (QGP) has been the focus of many high energy physics experiments for years.  There are many useful probes of a QGP.  An example is a pair of very energetic quarks and gluons produced in a heavy-ion collision.  This pair of partons, which can fragment into a collimated spray of hadrons, or `jets', will propagate through the dense medium and get slowed down or completely absorbed.  The resulting jets, which in vacuum are well understood within the framework of perturbative QCD, are attenuated by medium interactions, a process known as jet quenching.  This behavior can be studied by examining properties of the jet such as its substructure.  The differential jet shape observable, reveals the radial profile of transverse momentum distribution inside the jet.  By measuring the modifications of the jet shape, properties of the QGP at different length scales can be studied.

In this paper, the differential jet shape for full (charged + neutral) jets in \sNN = 200 GeV Au+Au collisions with the STAR experiment at RHIC will be discussed.  As the first measurement of its kind at RHIC energies, this work will measure jets at low-\pt (10-40 GeV/c), complementary to the LHC and demonstrate whether there is a modification and a broadening of the jet profile at RHIC energies.  To explore how the substructure of jets is modified in Au+Au relative to pp collisions, the dependence on centrality and jet transverse momentum (\ptJet) will be investigated..

Conclusion:
Still developing..
 

PA:
Joel Mazer, Rutgers
Tanmay Pani, Rutgers
Sevil Salur, Rutgers

Target Journal:

GPC:
(to be determined)

Paper draft: 
will be up very shortly..

Analysis Note:
will be up very shortly..

Analysis Code:
github pages:
1) https://github.com/joelmazer/star-jetframework
2) https://github.com/joelmazer/Centrality

Presentation to PWGC: (to be scheduled)

Presentation to JetCorr: (to be scheduled)

JetCorr updates:
October 22, 2018
November 12, 2018
November 30, 2018
December 7, 2018
December 13, 2018 - STAR Winter Analysis Meeting
February 15, 2019
March 11, 2019
March 15, 2019
March 30 - April 2, 2019 - STAR Collaboration Meeting
May 10, 2019
August 20-21, 2019 - STAR Collaboration Meeting
August 30, 2019
September 16, 2019
October 7, 2019,   updated slides
October 11, 2019 - additional meeting for QM
October 21, 2019
October 24, 2019 - updated plots for QM
May 7, 2020 - HP status
September 15-17, 2020 - STAR Collaboration Meeting

Public Presentations:
   - 13th International Workshop on High-pt Physics in the RHIC/LHC era - March 2019 - talk presentation: "Event plane dependence of jet quenching studied via azimuthal correlations and differential jet shape in Au+Au collisions at \sqrt{s_{NN}} = 200 GeV with the STAR detector at RHIC"
 
   - 13th International Workshop on High-pt Physics in the RHIC/LHC era - March 2019 - proceedings: "Event plane dependence of jet quenching studied via azimuthal correlations and differential jet shape in Au+Au collisions at \sqrt{s_{NN}} = 200 GeV with the STAR detector at RHIC"

   - Quark Matter November 2019 - poster presentation: "Evolution of jet shapes in Au+Au collisions at \sqrt{s_{NN}} = 200 GeV with the STAR experiment at RHIC

   - 2020 Santa Fe Jets and HF Workshop - talk presentation: "Evolution of jet shapes in Au+Au collisions at \sqrt{s_{NN}} = 200 GeV with the STAR experiment at RHIC"

   - Hard Probes June 2020 - talk presentation: "Jet shapes and Fragmentation functions in Au+Au collisions at \sqrt{s_{NN}} = 200 GeV in STAR"

   - Hard Probes June 2020 - proceedings:  "Jet shapes and Fragmentation functions in Au+Au collisions at \sqrt{s_{NN}} = 200 GeV in STAR"

Preliminary Plots:
   - preliminary plots page
   - preliminary plots page #2

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