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Compositeness

This workshop focused on the indications of quark compositeness and examined key signatures from excited quarks and leptons. We analyzed production cross sections specifically for jets and leptons, utilizing simulations through PYTHIA. The discussions covered various masses and resolution effects for excited quarks, as well as the implications for high-energy hadron colliders with a center-of-mass energy of 200 TeV. The insights gained here contribute significantly to our understanding of particle behavior in future colliders.

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Compositeness

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  1. Compositeness Ulrich Heintz International Workshop on Future Hadron Colliders - Ulrich Heintz

  2. Signals of compositeness • two signatures • excited quarks and leptons • production cross section for jets and leptons • only considered jets here • work done at Snowmass 2001 International Workshop on Future Hadron Colliders - Ulrich Heintz

  3. Excited quarks • production • q + g  q* • q + q’  q’’ + q* • decay • q* g + q • q*   + q • q*  W + q • q*  Z + q • simulation: pythia International Workshop on Future Hadron Colliders - Ulrich Heintz

  4. Excited quarks • production cross section in pb • assume s=200 TeV, 100 fb-1 (1 year @ 1035 cm-2s-1) International Workshop on Future Hadron Colliders - Ulrich Heintz

  5. Excited quarks m* = 60 TeV m* = 70 TeV m* = 80 TeV m* = 100 TeV International Workshop on Future Hadron Colliders - Ulrich Heintz

  6. Excited quarks • effect of resolution • 5% constant term m* = 60 TeV m* = 70 TeV m* = 80 TeV m* = 100 TeV International Workshop on Future Hadron Colliders - Ulrich Heintz

  7. Excited quarks perfect resolution resolution = 2% S/B for 100 fb-1 resolution = 5% resolution = 10% s = 200 TeV 100 fb-1 International Workshop on Future Hadron Colliders - Ulrich Heintz

  8. Jet cross section = 50 TeV = 75 TeV = 100 TeV International Workshop on Future Hadron Colliders - Ulrich Heintz

  9. Jet cross section • LL isoscalar model implemented in PYTHIA Eichten, Hinchliffe, Lane, Quigg (Rev Mod Physics 1984) International Workshop on Future Hadron Colliders - Ulrich Heintz

  10. Conclusions • sensitivity to quark compositeness • for s = 200 TeV and 100 fb-1 • excited quarks • m*· 70 TeV • jet cross section • · 95 TeV International Workshop on Future Hadron Colliders - Ulrich Heintz

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