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Hadron form factors and interactions...

Hong, Sungho.

Hadron form factors and interactions: Comparing AdS/CFT and QCD.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Hadron form factors and interactions: Comparing AdS/CFT and QCD.
Author:	Hong, Sungho.
Description:	151 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-06, Section: B, page: 2980.
Notes:	Supervisor: Mirjam Cvetic.
Contained By:	Dissertation Abstracts International65-06B.
Subject:	Physics, Elementary Particles and High Energy.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3138027
ISBN:	0496851977

Hadron form factors and interactions: Comparing AdS/CFT and QCD.
Hong, Sungho.

Hadron form factors and interactions: Comparing AdS/CFT and QCD. - 151 p.

Source: Dissertation Abstracts International, Volume: 65-06, Section: B, page: 2980.

Thesis (Ph.D.)--University of Pennsylvania, 2004.

The hadron form factors and the couplings are computed in AdS/CFT contexts and compared with QCD. In particular, adding fundamental matter of mass mQ to N = 4 Yang Mills theory, we study quarkonium, and "generalized quarkonium" containing light adjoint particles. At large 't Hooft coupling the states of spin ≤1 are anomalously light. We examine their form factors, and show these hadrons are unlike any known in QCD. By a traditional yardstick they appear infinite in size (as with strings in flat space) but we show that this is a failure of the yardstick. All of the hadrons are actually of finite size &sim; g2N /mQ, regardless of their radial excitation level and of how many valence adjoint particles they contain. Certain form factors for spin-1 quarkonia vanish in the large-g2N limit; thus these hadrons resemble neither the observed J/Psi quarkonium states nor rho mesons. We also address the issue of the rho meson coupling universality and the vector meson dominance from the viewpoint of AdS/CFT. After reviewing Son's proof of the exact decomposition of the hadron form factors in large N and large 't Hooft coupling, we compute examples in the hard-wall and D3/D7 model to verify the decomposition formula. We compute some form factors showing the similar behavior to the rho dominance, but it is also found that it does not necessarily lead to the coupling universality of the lowest vector hadron state. Instead, we find two limits where the universality generically exists, one at the large conformal dimension of the interpolating operator and the other at the high excitation of the coupled hadrons. It is shown that they can be understood in a simple way in the AdS/CFT context. It is also found an example of the model-dependent but exact universality in the D3/D7 model. We discuss the cases of heavy objects like nucleons and the experimental implications.

ISBN: 0496851977Subjects--Topical Terms:

227490
Physics, Elementary Particles and High Energy.

Hadron form factors and interactions: Comparing AdS/CFT and QCD.
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245 1 0 $a Hadron form factors and interactions: Comparing AdS/CFT and QCD.
300 $a 151 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-06, Section: B, page: 2980.
500 $a Supervisor: Mirjam Cvetic.
502 $a Thesis (Ph.D.)--University of Pennsylvania, 2004.
520 # $a The hadron form factors and the couplings are computed in AdS/CFT contexts and compared with QCD. In particular, adding fundamental matter of mass mQ to N = 4 Yang Mills theory, we study quarkonium, and "generalized quarkonium" containing light adjoint particles. At large 't Hooft coupling the states of spin ≤1 are anomalously light. We examine their form factors, and show these hadrons are unlike any known in QCD. By a traditional yardstick they appear infinite in size (as with strings in flat space) but we show that this is a failure of the yardstick. All of the hadrons are actually of finite size &sim; g2N /mQ, regardless of their radial excitation level and of how many valence adjoint particles they contain. Certain form factors for spin-1 quarkonia vanish in the large-g2N limit; thus these hadrons resemble neither the observed J/Psi quarkonium states nor rho mesons. We also address the issue of the rho meson coupling universality and the vector meson dominance from the viewpoint of AdS/CFT. After reviewing Son's proof of the exact decomposition of the hadron form factors in large N and large 't Hooft coupling, we compute examples in the hard-wall and D3/D7 model to verify the decomposition formula. We compute some form factors showing the similar behavior to the rho dominance, but it is also found that it does not necessarily lead to the coupling universality of the lowest vector hadron state. Instead, we find two limits where the universality generically exists, one at the large conformal dimension of the interpolating operator and the other at the high excitation of the coupled hadrons. It is shown that they can be understood in a simple way in the AdS/CFT context. It is also found an example of the model-dependent but exact universality in the D3/D7 model. We discuss the cases of heavy objects like nucleons and the experimental implications.
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