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Non-perturbative methods: HQET and l...

Dimm, William C.

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Non-perturbative methods: HQET and lattice gauge theory.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Non-perturbative methods: HQET and lattice gauge theory./
作者:	Dimm, William C.
面頁冊數:	139 p.
附註:	Chairman: T. Yan.
Contained By:	Dissertation Abstracts International56-04B.
標題:	Physics, Elementary Particles and High Energy. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9528233

Non-perturbative methods: HQET and lattice gauge theory.
Dimm, William C.

Non-perturbative methods: HQET and lattice gauge theory. - 139 p.

Chairman: T. Yan.

Thesis (Ph.D.)--Cornell University, 1995.

Although Quantum Chromodynamics (QCD) is considered to be the correct description of the strong interaction it is difficult to extract predictions for many processes from the theory because perturbation theory often cannot be applied. In this dissertation two approaches for extracting non-perturbatives predictions from QCD are used. The Heavy Quark Effective Theory (HQET) is combined with chiral symmetry to make predictions for the decays $\overline B\to D,D\sp{\*})\pi\ell\overline v$. It is found that the branching ratio for $\overline B\to D\pi\ell\overline v$ is about (0.5-1)%. The branching ratio for $\overline B\to D\sp{\*}\pi\ell\overline v$ is found to be about 10$\sp{-4}$-10$\sp{-5}$ but this does not include possible contributions from diagrams involving an intermediate Subjects--Topical Terms:

1019488
Physics, Elementary Particles and High Energy.

Non-perturbative methods: HQET and lattice gauge theory.
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008 110505s1995 eng d
035 $a (UnM)AAI9528233
035 $a AAI9528233
040 $a UnM $c UnM
100 1 $a Dimm, William C. $3 1256825
245 1 0 $a Non-perturbative methods: HQET and lattice gauge theory.
300 $a 139 p.
500 $a Chairman: T. Yan.
500 $a Source: Dissertation Abstracts International, Volume: 56-04, Section: B, page: 2089.
502 $a Thesis (Ph.D.)--Cornell University, 1995.
520 $a Although Quantum Chromodynamics (QCD) is considered to be the correct description of the strong interaction it is difficult to extract predictions for many processes from the theory because perturbation theory often cannot be applied. In this dissertation two approaches for extracting non-perturbatives predictions from QCD are used. The Heavy Quark Effective Theory (HQET) is combined with chiral symmetry to make predictions for the decays $\overline B\to D,D\sp{\*})\pi\ell\overline v$. It is found that the branching ratio for $\overline B\to D\pi\ell\overline v$ is about (0.5-1)%. The branching ratio for $\overline B\to D\sp{\*}\pi\ell\overline v$ is found to be about 10$\sp{-4}$-10$\sp{-5}$ but this does not include possible contributions from diagrams involving an intermediate $d \sp{\*\*}$. The second approach is lattice gauge theory. Here, the connection between Monte Carlo results and lattice perturbation theory is examined. It is shown that 2-loop perturbative coefficients for the quark mass renormalization can be extracted from Monte Carlo data for both Wilson and NRQCD quarks. Such a procedure is important for understanding the relationship between bare lattice parameters and the physical parameter values which determine the meaning of a simulation. Understanding such relationships is crucial to the program of constructing improved lattice actions which allow efficient computation of non-perturbative physical quantities.
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 56-04B.
790 $a 0058
790 1 0 $a Yan, T., $e advisor
791 $a Ph.D.
792 $a 1995
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9528233