CPT Student Seminar: Resumming threshold logs in top quark pair production
11 May 2015 17:00 in OC218
This talk will discuss how threshold logarithms, which become large as the invariant mass of the produced top quarks approaches the partonic centre of mass, can be resummed using techniques from Soft Collienar Effective Theory (SCET). The resummation is possible because a factorisation takes place in the threshold limit which allows one to derive and solve RG equations. It will be shown how the solutions to these equations lead to the inclusion of large logs to all orders in the perturbative expansion and a finite answer obtained. Such results can then be matched with an exact NLO to produce NLO+NNLL results, providing a more accurate determination of differential cross-sections. Finally it is also possible to use the RG equations to obtain approximate fixed order results at higher orders in perturbation theory. The results and discussion will also feature boosted top quark production where approximate N^3LL and N^3LO results are obtained.
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A gathering of mathematicians from the CPT group with physicists from IPPP, we meet to discuss our work in a relaxed and friendly environment.
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