Angular distribution of thrust axis with power-suppressed contribution in e+e- annihilation

Understand

Structure function of e+e- to hadrons cross section proportional to the longitudinal part of the hadron tensor is power suppressed with respect to an event shape variable in the two-jet region.

• In the SCET framework, we study the event shape distribution for this structure function to NLL level of accuracy.
• As, a result we obtain the angular distribution of hadron jets as a function of the thrust, in the two jet region.
• We further examine effects of non-perturbative hadronization corrections by adopting a shape function that reproduce the observed event shape distributions.