2012

Quenching of high-pT hadrons: Energy Loss vs Color Transparency

Kopeliovich, B. Z., Nemchik, J., Potashnikova, I. K. et al.

Understand

High-pT hadrons produced in hard collisions and detected inclusively bear peculiar features: (i) they originate from jets whose initial virtuality and energy are of the same order; (ii) such jets are rare and have a very biased energy sharing among the particles, namely, the detected hadron carries the main fraction of the jet energy.

  • The former feature leads to an extremely intensive gluon radiation and energy dissipation at the early stage of hadronization, either in vacuum or in a medium.
  • As a result, a leading hadron must be produced on a short length scale.
  • Evaluation within a model of perturbative fragmentation confirms the shortness of the production length.

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