Universality of 1/Q corrections revisited | Zendy

Mrinal Dasgupta | Zendy; Lorenzo Magnea | Zendy; Graham E Smye | Zendy

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Universality of 1/Q corrections revisited

Author(s) -

Mrinal Dasgupta,

Lorenzo Magnea,

Graham E Smye

Publication year - 1999

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/1999/11/025

Subject(s) - abelian group , universality (dynamical systems) , annihilation , physics , mathematics , statistical physics , quantum mechanics , pure mathematics

We provide an exact analytical calculation at the two-loop level in theabelian limit of the leading power correction for the C parameter in e+e-annihilation. We compare our results to the numerical value obtained employingthe soft approximation, the abelian part of the Milan factor. We demonstratethat a simple proportionality holds between the leading power corrections tothe C parameter and to the longitudinal cross section in the soft region, andwe verify that this proportionality holds for the full two-loop abeliancontribution computed here. We comment on the possibility of extending thistechnique to other event shape variables and distributions, as well as to thenon-abelian contributions.Comment: 14 pages. Reference added 18/11/9

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