Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-09-18
Phys.Rev.D77:014026,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, 1 figure; notation updated and references added
Scientific paper
10.1103/PhysRevD.77.014026
The resummed differential thrust rate in e+e- annihilation is calculated using Soft-Collinear Effective Theory (SCET). The resulting distribution in the two-jet region T~1 is found to agree with the corresponding expression derived by the standard approach. A matching procedure to account for finite corrections at T < 1 is then described. There are two important advantages of the SCET approach. First, SCET manifests a dynamical seesaw scale q = p^2/Q in addition to the center-of-mass energy Q and the jet mass scale p ~ Q ~ sqrt(1 - T). Thus, the resummation of logs of p/q can be cleanly distinguished from the resummation of logs of Q/p. Second, finite parts of loop amplitudes appear in specific places in the perturbative distribution: in the matching to the hard function, at the scale Q, in matching to the jet function, at the scale p, and in matching to the soft function, at the scale q. This allows for a consistent merger of fixed order corrections and resummation. In particular, the total NLO e+e- cross section is reproduced from these finite parts without having to perform additional infrared regulation.
No associations
LandOfFree
Resummation and NLO Matching of Event Shapes with Effective Field Theory does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Resummation and NLO Matching of Event Shapes with Effective Field Theory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Resummation and NLO Matching of Event Shapes with Effective Field Theory will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-456018