Effective field theories for inclusive B decays

In this thesis, we study inclusive decays of the B meson. These allow one to determine CKM elements precisely and to search for physics beyond the Standard Model. We use the framework of effective field theories, in particular the Soft-Collinear Effective Theory, which is a suitable method when the decay products include a jet-like set of hadronic states. We derive factorization theorems for ... corrections (including all orders in a,) to ... in the shape function region, where ... A complete enumeration of ... contributions is provided. We also point out the presence of new shape functions that arise from four-quark operators. These induce an additional uncertainty in certain inclusive determinations of ... Next, we derive the triply differential spectrum for ... in the shape function region, consideration of which is necessitated by experimentally required cuts. It is shown that the same universal jet and shape functions appear as in the decays ... We also show that one can treat the perturbative power counting above and below the scale ... independently, using a procedure we call "split matching".

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Physics.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2006

Author dc:creator

• Lee, Keith S. M. (Keith Seng Mun)

Advisor dc:contributor.advisor

• Iain W. Stewart.

• Physics.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/36809
• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Identifier URI

http://dspace.mit.edu/handle/1721.1/36809

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/36809