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Soft-collinear factorization and Sud...

Lange, Bjorn Olaf.

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Soft-collinear factorization and Sudakov resummation of heavy meson decay amplitudes with effective field theories.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Soft-collinear factorization and Sudakov resummation of heavy meson decay amplitudes with effective field theories./
Author:	Lange, Bjorn Olaf.
Description:	201 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0335.
Contained By:	Dissertation Abstracts International66-01B.
Subject:	Physics, Elementary Particles and High Energy. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3162184
ISBN:	9780496961542

Soft-collinear factorization and Sudakov resummation of heavy meson decay amplitudes with effective field theories.
Lange, Bjorn Olaf.

Soft-collinear factorization and Sudakov resummation of heavy meson decay amplitudes with effective field theories. - 201 p.

Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0335.

Thesis (Ph.D.)--Cornell University, 2005.

Decays of the B meson into light and energetic particles are discussed. The calculation of the corresponding decay amplitudes is non-trivial in many respects. Strong interaction effects are always present and cannot be computed reliably using analytic techniques. However, besides the intrinsic energy scale lambdaQCD of Quantum Chromo Dynamics, there also exists a much larger scale, the b-quark mass m b, at which perturbation theory can be applied. QCD-factorization is the idea of separating the contributions that arise at these different scales and performing a systematic expansion in the ratio lambdaQCD /mb. Hard processes at the large scale can be computed using perturbation theory, while soft processes are encoded in non-perturbatioe structure functions. The observation that for many decay modes the same structure functions are needed make this a useful approach. However, factorization theorems need to be proved for every single decay, since some amplitudes do not factorize. The intent of this thesis is to study examples of factorizable and non-factorizable amplitudes in a systematic framework, by using effective field theory techniques.

ISBN: 9780496961542Subjects--Topical Terms:

1019488
Physics, Elementary Particles and High Energy.

Soft-collinear factorization and Sudakov resummation of heavy meson decay amplitudes with effective field theories.
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100 1 $a Lange, Bjorn Olaf. $3 1913120
245 1 0 $a Soft-collinear factorization and Sudakov resummation of heavy meson decay amplitudes with effective field theories.
300 $a 201 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0335.
500 $a Adviser: M. Neubert.
502 $a Thesis (Ph.D.)--Cornell University, 2005.
520 $a Decays of the B meson into light and energetic particles are discussed. The calculation of the corresponding decay amplitudes is non-trivial in many respects. Strong interaction effects are always present and cannot be computed reliably using analytic techniques. However, besides the intrinsic energy scale lambdaQCD of Quantum Chromo Dynamics, there also exists a much larger scale, the b-quark mass m b, at which perturbation theory can be applied. QCD-factorization is the idea of separating the contributions that arise at these different scales and performing a systematic expansion in the ratio lambdaQCD /mb. Hard processes at the large scale can be computed using perturbation theory, while soft processes are encoded in non-perturbatioe structure functions. The observation that for many decay modes the same structure functions are needed make this a useful approach. However, factorization theorems need to be proved for every single decay, since some amplitudes do not factorize. The intent of this thesis is to study examples of factorizable and non-factorizable amplitudes in a systematic framework, by using effective field theory techniques.
520 $a The advancing precision of experimental measurements of B-decays make it necessary to improve the accuracy of theoretical predictions. To achieve this, it is necessary to perform a resummation of Sudakov logarithms, which enter at every non-trivial order in perturbation theory.
520 $a In this thesis we present an introduction to Soft-Collinear Effective Theory, which can be used to prove (or disprove) factorization theorems to all orders in the strong coupling constant for some B decays into light and energetic particles. Specifically, the factorizable amplitudes for inclusive B → Xul- n&d1; and exclusive B- → gamma l- n&d1; are calculated in renormalization-group improved perturbation theory to first non-trivial order. Form factors encoding the exclusive decay amplitudes for B¯ → Pl- n&d1; and B → Vl- n&d1; (P = light pseudoscalar meson, V = light vector meson) are studied and proved to be dominated by the non-factorizable Feynman mechanism.
590 $a School code: 0058.
650 4 $a Physics, Elementary Particles and High Energy. $3 1019488
690 $a 0798
710 2 0 $a Cornell University. $3 530586
773 0 $t Dissertation Abstracts International $g 66-01B.
790 1 0 $a Neubert, M., $e advisor
790 $a 0058
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3162184