✎ jets [Jesse Thaler]

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====== N-subjettiness ======

{{http://www.jthaler.net/jets/NsubPicture.png?250|N-subjettiness}}
{{http://www.jthaler.net/jets/NsubPicture2.png?250|N-subjettiness}}

==== FastJet Plugin ====

  * We're pleased to announce that the latest version is available from the [[http://fastjet.hepforge.org/contrib/|FastJet Contrib]] project.  Further development will continue from there.

==== Older Versions for Debugging Purposes ====

  * **[[http://jthaler.net/jets/Njettiness-0.4.1.tar.gz|N-(sub)jettiness Plugin]]** (Version 0.4.1, Stable)
  * **[[http://jthaler.net/jets/Njettiness-0.5.1.tar.gz|N-(sub)jettiness Plugin]]** (Version 0.5.1, Experimental)

==== Publications ====

  * **Maximizing Boosted Top Identification by Minimizing N-subjettiness**. \\  Jesse Thaler and Ken Van Tilburg. \\ [[http://www.arxiv.org/abs/1108.2701|arXiv:1108.2701]].

  * **Identifying Boosted Objects with N-subjettiness**.\\ Jesse Thaler and Ken Van Tilburg.\\ [[http://dx.doi.org/10.1007/JHEP03(2011)015|JHEP 1103:015 (2011)]], [[http://www.arxiv.org/abs/1011.2268|arXiv:1011.2268]].

==== Contact Authors ====
  * <jthaler@jthaler.net>, <kvt@mit.edu>


====== Jet Trimming ======

{{http://www.jthaler.net/jets/Jet_Trimming_files/droppedImage.png?250|Jet Trimming}}
{{http://www.jthaler.net/jets/Jet_Trimming_files/droppedImage_1.png?250|Jet Trimming}}

==== FastJet Plugin ====

  * We're pleased to announce that the latest version is available from the [[http://fastjet.hepforge.org/contrib/|FastJet Contrib]] project.  Further development will continue from there.

=== Older Versions for Debugging Purposes ===


  * **[[http://jthaler.net/jets/TrimmingPlugin.tar.gz|Jet Trimming Plugin]]**

==== Publications ====

  * **Jet Trimming**.\\ David Krohn, Jesse Thaler, and Lian-Tao Wang.\\ [[http://dx.doi.org/10.1007/JHEP02(2010)084|JHEP 1002:084 (2010)]], [[http://www.arxiv.org/abs/0912.1342|arXiv:0912.1342]].

  * Abstract:  Initial state radiation, multiple interactions, and event pileup can contaminate jets and degrade event reconstruction.  Here we introduce a procedure, jet trimming, designed to mitigate these sources of contamination in jets initiated by light partons.  This procedure is complimentary to existing methods developed for boosted heavy particles.  We find that jet trimming can achieve significant improvements in event reconstruction, especially at high energy/luminosity hadron colliders like the LHC.

==== Contact Authors ====
  * <dkrohn@princeton.edu>, <jthaler@jthaler.net>, <lianwang@princeton.edu>


====== Jets with Variable R ======

{{http://www.jthaler.net/jets/VR_Jets_files/droppedImage.jpg?500| Jets with Variable R}}



==== FastJet Plugin ====
  * **[[http://jthaler.net/jets/VRPlugins.tar.gz|Jets with Variable R Plugin]]**

==== Publications ====

  * **Jets with Variable R**.\\ David Krohn, Jesse Thaler, and Lian-Tao Wang.\\ [[http://www.iop.org/EJ/abstract/1029-8479/2009/06/059|JHEP 0906:059 (2009)]], [[http://www.arxiv.org/abs/0903.0392|arXiv:0903.0392]].

  * **Abstract**:  We introduce a new class of jet algorithms designed to return conical jets with a variable Delta R radius. A specific example, in which Delta R scales as 1/pT, proves particularly useful in capturing the kinematic features of a wide variety of hard scattering processes. We implement this Delta R scaling in a sequential recombination algorithm and test it by reconstructing resonance masses and kinematic endpoints. These test cases show 10-20% improvements in signal efficiency compared to fixed Delta R algorithms. We also comment on cuts useful in reducing continuum jet backgrounds.


==== Contact Authors ====
  * <dkrohn@princeton.edu>, <jthaler@jthaler.net>, <lianwang@princeton.edu>