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===== Jet Physics Subgroup =====

We have a slack channel: jetsatleshouches2017.  Here is the invite link:

https://join.slack.com/jetsatleshouches2017/shared_invite/MTk0Njc1MDY2MzQzLTE0OTY4MTY5ODctMmMxMmQwYjQyMw

Please join for coordination of the various projects!

Please add your name to the relevant topic if you are interested in contributing.

  * Convener:  **Jesse Thaler**
  * Sub-convener:  **Gregory Soyez**
   
==== Comprehensive Two-Prong Study ====

  * Leader:  **Peter Loch** <loch@physics.arizona.edu>
  * Participants:  **Jesse Thaler, Gregory Soyez, Andrzej Siodmok, Deepak Kar, Reina Camacho, Frédéric Dreyer, Suman Chatterjee, Disha Bhatia, Grigorios Chachamis, Tousik Samui, Ian Moult, Andreas Papaefstathiou, Mario Campanelli **

  * **NEW: kick-off meeting: Wednedsay 10am, QCD room**

  * Detector Effects
  * Understand ATLAS/CMS differences in grooming/discrimination
  * Compare recent tools
  * Study performance and robustness
  * W boson polarization
  * Get event samples
==== Strong Coupling Extraction ====

  * Leaders:  **Ben Nachman, Ian Moult**
  * Participants:  **Jesse Thaler, Gregory Soyez, Andrzej Siodmok, Frédéric Dreyer, Daniel Maitre, Suman Chatterjee, Disha Bhatia, Grigorios Chachamis, Maroa Vittoria Garzelli, Andrew Larkoski, Simone Marzani, Tousik Samui, Philippe Gras, Peter Richardson, Andreas Papaefstathiou, Johannes Bellm **
   
  * **NEW:  Kickoff meeting, Wednesday, QCD Room, 2:30pm**
   
  * Use groomed jets (e.g. soft drop with varying β) at (N)NLL accuracy
  * Pursue tricks to separate quark/gluon composition
  * Estimate experimental uncertainties (10 percent?)
  * Relevant for running coupling at high scales
  * Comparison to 3-jet/2-jet ratios for sensitivity
   
==== Quark/Gluon Followup Study ====

  * Leader:  **TBD**
  * Participants:  **Ben Nachman, Andrzej Siodmok, Deepak Kar, (Frédéric Dreyer), Adil Jueid, Grigorios Chachamis, Andreas Papaefstathiou, Joey Huston, Kenneth Long, Peter Richardson, Simon Plätzer, Reina Camacho, Mario Campanelli ...**
 
  * Use quark/gluon tagging for PDF determination
  * Use LEP data (b bbar g) for gluon jet constraints (e.g. Skands with ALEPH)
  * Use in vector boson scattering, vector boson fusion
  * Use in Higgs plus jet
  * Also quark vs. gluon vs. pileup
==== Additional Topics for Lunch/Dinner/Bar ====

  * Heavy ion jet shapes (pp, pA, AA)
    * Participants:  **Jesse Thaler, Gregory Soyez, Ben Nachman, Frédéric Dreyer, Grigorios Chachamis, Leif Lönnblad, , Andrzej Siodmok  ...**
  * Jet substructure to understand parton shower subtleties
    * Participants:  **Jesse Thaler, Gregory Soyez, Ben Nachman, Deepak Kar, Reina Camacho, Josh McFayden, Frédéric Dreyer, Suman Chatterjee, Peter Loch, Jueid Adil, Leif Lönnblad, Ian Moult, Andreas Papaefstathiou, Philippe Gras, Andrzej Siodmok, Simon Plätzer, (Emanuele Re) **
    * Identify experimental results
    * Non-global obseravbles, color correlations
  * Heavy flavor married with jet substructure
    * Participants:  **Jesse Thaler, Gregory Soyez, Ben Nachman, Reina Camacho, Josh McFayden, Frédéric Dreyer, Hua-Sheng Shao, Leif Lönnblad, Maria Vittoria Garzelli, Philippe Gras**
    * Use bottom/charm tags with subjet momentum fractions
    * Complications of fragmentation functions
    * Charmonium fragmentation in jets
  * Track-based observables
    * Participants:  **Jesse Thaler, Gregory Soyez, Ben Nachman, Frédéric Dreyer, Ian Moult, Philippe Gras, Andrzej Siodmok, Simon Plätzer **
    * Relevant for improved angular resolution at ATLAS/CMS/future collider
    * Use generalized fragmentation functions (e.g. jet charge)
  * Truth Fat Jet Definition
    * Participants:  **Deepak Kar, Andy Buckley, Chris Pollard ...**
  * Jet algorithms and R dependence at (N)NLO
    * Participants:   **Gregory Soyez, Frédéric Dreyer,Suman Chatterjee, Joey Huston, Philippe Gras, Simon Plätzer ...**
    * Advice:  Measure as many R as possible!
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