K_T Jet Algorithm Working Group

Group Leaders: H.Schellman, V.Daniel Elvira

The aim of the group is to produce physics measurements using Run I (1992-1995) data, and improve our understanding of the K_T  algorithm in a hadron collider environment (the Fermilab Tevatron) towards its use in Run II. We are also participating in Run II Workshops.

You can read Minutes which are produced weekly after the meeting.

Why the K_T algorithm?

As an alternative to the fixed cone algorithm, the D0 experiment has implemented a successive combination type of algorithm (K_T) to reconstruct jets. This algorithm has been widely used at the DESY electron-proton and the CERN electron-positron colliders. It presents several advantages over its fixed cone predecessor. First , the absence of cone boundaries avoids out-of-cone showering losses. Second,  it can be implemented in the same way at all levels (parton level theoretical calculation, final state particle level  Monte Carlo, calorimeter cells), therefore eliminating the split/merge ambiguity. In addition, the algorithm is infrared safe at all orders in a perturbative QCD calculation.

For a description of the D0 K_T algorithm (as compared with the fixed cone algorithm) click here.

Physics Analyses

• K_T Jet  Momentum Calibration ( also visit K. Frame's page)

• Inclusive Jet Cross Section (also visit S. Grinstein's page)

• Subjet Multiplicity in Q and G Jets (also visit R. Snihur's page)

• Thrust Distributions (also visit V. Sorin's page)

Run II Workshops:

         Suppersymmetry/Higgs(home page)

• M_higgs  Status Report (May 8^th) - R. Snihur

• M_higgs  Status Report (Jun 12^th) - R. Snihur

• Jet Properties at D0 (March 8^th) - R. Snihur

• KT Jets at D0 (May 7^th) - R. Snihur

• Event Shapes at D0 (June 3rd) - D. Elvira

• Event Shapes at D0: Thrust Analysis (June 3rd) - V. Sorin

• KT Jets  (June 3^th) - R. Snihur

• Calibration of KT Jets at D0 (Nov 4th) - D. Elvira

• Preclustering Tests (Nov 4^th) - R. Snihur

• Summary on KT Algorithm  (Nov 6^th) - R. Snihur