Matching NLLA+NNLO for event shape distributions

Details Matching NLLA+NNLO for event shape distributions Matching NLLA+NNLO for event shape distributions

2008-03-05

arxiv.org/abs/0803.0695v4

Phys.Lett.B664:265-273,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 18 figures; typos corrected, published version

Scientific paper

10.1016/j.physletb.2008.05.023

We study the matching of the next-to-leading logarithmic approximation (NLLA) onto the fixed next-to-next-to-leading order (NNLO) calculation for event shape distributions in electron-positron annihilation. The resulting theoretical predictions combine all precision QCD knowledge on the distributions, and are theoretically reliable over an extended kinematical range. Compared to previously available matched NLLA+NLO and fixed order NNLO results, we observe that the effects of the combined NLLA+NNLO are small in the three-jet region, relevant for precision physics.

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