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the application of scet to heavy quarkonium physics

liu, xiaohui (2011) the application of scet to heavy quarkonium physics. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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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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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairLeibovich, Adamakl2@pitt.eduAKL2
Committee MemberDuncan, Anthonytony@dectony.phyast.pitt.eduHAD
Committee MemberSwanson, Ericswansone@pitt.eduSWANSONE
Committee MemberRothstein,
Committee MemberBoudreau, Joeboudreau@pitt.eduBOUDREAU
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:, etd-07272011-095829
Date Deposited: 10 Nov 2011 19:54
Last Modified: 15 Nov 2016 13:47


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