SnowMass2021

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====== TF07: Collider phenomenology ======
Co-Conveners: Fabio Maltoni (Louvain/Bologna), Shufang Su (U Arizona), Jesse Thaler (MIT)

===== Meetings =====
  * Kick off  meeting  (July 30, 2020): [[https://www.dropbox.com/s/jfqmhltztkghw3d/Theory_Frontier_TF07_kickoff.pdf?dl=0|Slides]], [[https://www.dropbox.com/s/tmv0wapwo0aon6e/zoom_07302020.mp4?dl=0|Video  recordings]]

  * Town Hall meeting to discuss the white paper plan (Dec 9, 2020): [[https://www.dropbox.com/s/08kkdzy00clvgcs/TF07_TownHall_Dec_2020_v2.pdf?dl=0|Slides]], [[https://www.dropbox.com/s/kc7wx540bmcumfj/TF07_Tiwnhall_120820.mp4?dl=0|Video  recordings]], [[https://indico.fnal.gov/event/46553/|Indico]]

===== Staying Informed =====

  * Slack:  [[https://snowmass2021.slack.com/archives/C01593MBYEB|#tf07-collider]]
  * Mailing List:  Send an e-mail to [[ listserv@fnal.gov]] with subject line blank, and in the body of the text type ''SUBSCRIBE SNOWMASS-TF-07-COLLIDER_PHENO FIRSTNAME LASTNAME''


===== Description=====
TF07 will illustrate exciting new directions in collider phenomenology, as well as establish key connections between cutting-edge theoretical advances and current and future experimental opportunities. We will also identify the most promising avenues where major theory breakthroughs could take place in the coming years, which could lead to transformative concepts and techniques in collider phenomenology. 
  
**Topics:**
  * New collider data analysis strategies, including kinematic variables, tagging methods, clustering algorithms (EF06/07), and machine learning approaches (CompF3), for example those that incorporate theoretical developments and experimental requirements
  * Novel collider signatures, including those that are currently difficult to study or require alternative event reconstruction (EF08/09/10)
  * Techniques to maximize the sensitivity and broaden the range of new physics searches, including multi-channel combinations and anomaly detection (EF08/09/10), and reinterpretation/archival data (CompF7)
  * Advances in event simulation, including those that can increase accuracy/precision and overcome speed/storage limitations (CompF2/4)
  * Theory input on the targets and challenges for current and next-generation colliders (AF3/4)
  * Top-down: implications of model building developments (EF08/TF08) in identifying smoking gun signatures of new physics and developing targeted analysis strategies
  * Bottom-up: effective field theories (EF09/EF04/TF02) and simplified models (TF08/EF09/10) for model-independent characterization and interpretation of collider data
  * Impact of the precision frontier (TF06) on event generation and collider measurements (EF01/02/03/04/05) 
  * Applications of amplitudes developments (TF04) for precision predictions and new physics characterization
  * Impact of non-perturbative methods to improve (TF03/05): i) collider inputs (e.g. parton distribution functions, fragmentation functions, strong coupling constant), including lattice field theory and analytic techniques (EF05/06); ii) understanding of non-perturbative BSM scenarios (EF08/09/10)
  * Connections to astrophysics and cosmology (TF09, CF1/2), including collider probes of dark sectors and baryogenesis (EF10)
  * Connections to the intensity frontier, including collider probes of neutrino physics (TF11, NF02/03), flavor physics, and CP violation (RF1/2/3), L and B violation (RF4/5)
  * Relevance of quantum information for collider analyses (TF10/CompF6)

===== Development of Contributed Papers =====

A number of LOIs (listed below) have been submitted to TF07, and we anticipate that many of them will evolve into full contributed papers.

The following (evolving) list is of contributed papers in development that are aimed at taking a broader view of collider phenomenology.   Please contact the conveners if you are interested to contribute.  We also welcome separate contributed papers, even if they have overlap with these topics, if you have a complementary perspective to bring to the Snowmass process.

  * **Observables**
        * Geometric strategies for collider data analysis. Coordinator: Jesse Thaler (MIT) 
        * Theoretical perspective on machine learning for data analysis. Coordinator: Andrew Larkoski (Reed)
        * New developments in kinematic observables. Coordinator: Doojin Kim (Texas A&M) 
        *  New kinematic representations of jets and events.  Coordinator: Tao Liu (HKUST)
        *  ...

  * **Calculations** 
       * Interface of theory calculations with experimental methods. Coordinator: Simone Marzani (Genova)  
       *  Electroweak at very high energy  and EW parton showers. Coordinator: Tao Han (Pittsburg) 
       * Needs and trends in QED resummation.  Coordinators: Stefano Frixione (Genova) and Eric Laenen (NIKHEF)  
       * Factorization. Coordinator: George Sterman (Stony Brook)
       * Higher order QCD calculations inspired by aspects of collider pheno  -- This is a topic being explored but no coordinator identified yet
       *  ...

  *  **Generators**
       * NNLO+NNLL event generators.  Coordinator: Giulia Zanderighi (Munich)
       * First-principles simulations with machine learning. Coordinator: Tilman Plehn (Heidelberg)  
       * ....

  *  **Interpretation**
        * Anomaly detection with machine learning.  Contact: David Shih (Rutgers) -- To be developed under this LOI:  https://www.snowmass21.org/docs/files/summaries/EF/SNOWMASS21-EF9_EF10-CompF3-028.pdf
        * Opportunities for theory studies with public collider data.  Coordinator: Matt Bellis (Siena)  --  Additional topics in data preservation, recasting, and reinterpretation to be discussed with CompF7
        * Fully differential likelihood techniques. Coordinators: Kyle Cranmer (NYU), Felix Kling (SLAC)
        * …

  * BSM Signatures
         * Ultra-exotics and forgotten signatures at colliders  -- This is a topic being explored but no coordinator identified yet
         * Model dependent vs. model independent approaches -- This is a topic being explored but no coordinator identified yet
         * ...
===== Submitted LOI =====
Here is the list of submitted LOIs to this  topic. 
 First index before "/"  corresponds to the primary frontier used for the submission.
 {{url>https://www.snowmass21.org/docs/files/list.php?frontier=TF7  border 100%,1200px}}