Document Type

Dissertation

Degree

Doctor of Philosophy (PhD)

Department

Physics

First Advisor's Name

Misak M. Sargsian

First Advisor's Committee Title

Committee chair

Second Advisor's Name

Oren W. Maxwell

Second Advisor's Committee Title

Committee member

Third Advisor's Name

Werner Boeglin

Third Advisor's Committee Title

Committee member

Fourth Advisor's Name

Gueo Grantcharov

Fourth Advisor's Committee Title

Committee member

Keywords

physics, nuclear, spectral function

Date of Defense

5-12-2017

Abstract

The main goal of the research presented in my dissertation was to develop a theoretical model for relativistic nuclear spectral functions at high missing momenta and removal energies based on the multi-nucleon short-range correlation (SRC) model. The nuclear spectral functions are necessary for the description of high energy nuclear processes currently being studied at different labs such as JLAB, LHC and FNAL.

The model followed the effective Feynman diagrammatic approach in order to ac-count for the relativistic effects important in the SRC domain. In addition to the two-nucleon (2N) SRC with center of mass motion contribution, the contribution of the three-nucleon SRCs to the spectral functions was also derived. The latter was modeled based on the assumption that the 3N SRCs are a product of two sequential short range nucleon-nucleon (NN) interactions.

The nuclear spectral functions models were derived from two theoretical frameworks for evaluating covariant Feynman diagrams: In the first, referred to as the virtual nucleon approximation, the Feynman diagrams were reduced to the time ordered non-covariant diagrams by evaluating the nucleon spectators in the SRC at their positive energy poles, neglecting explicitly the contribution from vacuum diagrams. In the second approach, referred to as the light-front approximation, the boost invariant nuclear spectral function was formulated in the light-front reference frame in which case the vacuum diagrams are kinematically suppressed and the bound nucleon is described by its light-front variables such as momentum fraction, transverse momentum and invariant mass.

On the basis of the derived nuclear spectral functions, the corresponding computational models were developed from which the numerical estimates of the SRC spectral functions, the SRC momentum distributions, and the SRC density matrices were obtained.

Identifier

FIDC001903

Included in

Nuclear Commons

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