liu, xiaohui
(2011)
the application of scet to heavy quarkonium physics.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
Advisor: Adam LeibovichIn this thesis we explore various heavy quarkonium decay and production processes in certain kinematic regime close to phase space boundaries. Our traditional understanding of heavy quarkonium physics is rooted in the nonrelativistic QCD (NRQCD) formalisms. However close to certain phase space boundaries, NRQCD factorization theorems for quarkonium production or decay break down. This is mainly due to the occurrence of very energetic jet states which are not properly included in the framework of NRQCD, which result in large perturbative and non-perturbative corrections. Discrepancies between NRQCD predictions and experimental results have been observed. Thus in these regions we utilize the soft collinear effective theory (SCET) to derive factorization theorems in which the collinear degrees of freedom will be included correctly meanwhile shape functions describing the internal motion of the heavy quarkonium will arise naturally. Large logarithmic corrections due to several well-separated scales are summed up using renormalization group equations (RGEs). Combining SCET with fixed order NRQCD calculations, we obtain results with better agreement with the experimental data.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
29 September 2011 |
| Date Type: |
Completion |
| Defense Date: |
12 April 2011 |
| Approval Date: |
29 September 2011 |
| Submission Date: |
27 July 2011 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Dietrich School of Arts and Sciences > Physics |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
effective theory; field theory; QCD; quarkonium; scet |
| Other ID: |
http://etd.library.pitt.edu/ETD/available/etd-07272011-095829/, etd-07272011-095829 |
| Date Deposited: |
10 Nov 2011 19:54 |
| Last Modified: |
15 Nov 2016 13:47 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/8670 |
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