Modern studies of the Deuteron: From the lab frame to the light front

Boeglin, W.; Sargsian, Misak

doi:10.1142/s0218301315300039

Cited by 31 publications

(32 citation statements)

References 63 publications

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“…48 This conservation results in the GEA prediction that in quasi-elastic scattering FSI peaks at α s = 1 rather than at spectator angles θ sq = 90 0 (relative to the momentum transfer) as it is expected in the conventional Glauber approximation. For p s = 400 MeV/c the condition α s = 1 corresponds to θ sq ≈ 70 0 which was observed experimentally in the recent quasi-elastic deuteron electrodisintegration measurements [35][36][37] For deep-inelastic processes, the challenge in describing final-state interactions lies in the fact that for the produced X-state both its composition and space-time evolution are to a large extent unknown. In order to use GEA, we impose an additional constraint (consistent with the large Bjorken x kinematics) that:…”

Section: Generalized Eikonal Approximationmentioning

confidence: 99%

“…During the last several decades, progress in the determination of N N interaction potentials 33,34 as well as completion of the first high-energy deuteron electro-disintegration experiments, [35][36][37] allowed to confine the uncertainty of the deuteron wave function to ∼ 5% for internal momenta of up to 400 MeV/c. Such a knowledge of the deuteron in the range of 0-400 MeV/c translates into internucleon distances of ∼ 4 − 1.2 fm.…”

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confidence: 99%

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Nuclear final-state interactions in deep inelastic scattering off the lightest nuclei

Cosyn

Sargsian

2017

Int. J. Mod. Phys. E

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We review recent progress in studies of nuclear final-state interactions in deep inelastic scattering (DIS) off the lightest nuclei tagged by a recoil nucleon. These processes hold a lot of potential for resolving the outstanding issues related to the dynamics of hadronization in QCD. Within the minimal Fock component framework, valid at large Bjorken x, the main features of the theoretical approach based on the virtual nucleon approximation are elaborated. In this approach, the strong final-state interaction of the DIS products with the nuclear fragments is described by an effective eikonal amplitude, whose parameters can be extracted from the analysis of semi-inclusive DIS off the deuteron target. The extraction of the Q 2 and W mass dependences of these parameters gives a new observable in studying the QCD structure of DIS final states. Another important feature of tagged DIS off the lightest nuclei is the possibility of performing pole extrapolation with a high degree of accuracy. Such extrapolation allows an extraction of the neutron structure function in a model independent way due to suppression of the final-state interaction in the on-shell limit of the struck nucleon propagator. We review the first application of the pole extrapolation to recent experimental data. Finally, we outline the extension of the framework to inclusive DIS, including a polarized deuteron target as well as its application to the tagged DIS reactions for future experiments at fixed target and collider energies.

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Section: Generalized Eikonal Approximationmentioning

confidence: 99%

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confidence: 99%

Nuclear final-state interactions in deep inelastic scattering off the lightest nuclei

Cosyn

Sargsian

2017

Int. J. Mod. Phys. E

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“…In this respect the recent experiments [35,36] and planned new measurements [37] of high energy exclusive electro-disintegration of the deuteron opens up a new possibilities in the extraction of the deuteron momentum distribution at very large momenta. The measured distributions ten can be utilized in the calculation of the nuclear spectral functions in the multi-nucleon SRC region.…”

Section: Phenomenology Of Two Nucleon Short Range Correla-tions Imentioning

confidence: 99%

Multinucleon short-range correlation model for nuclear spectral functions: Theoretical framework

Artiles

Sargsian

2016

Phys. Rev. C

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We develop a theoretical approach for nuclear spectral functions at high missing momenta and removal energies based on the multi-nucleon short-range correlation (SRC) model. The approach is based on the effective Feynman diagrammatic method which allows to account for the relativistic effects important in the SRC domain. In addition to two-nucleon SRC with center of mass motion we derive also the contribution of three-nucleon SRCs to the nuclear spectral functions. The latter is modeled based on the assumption that 3N SRCs are a product of two sequential short range NN interactions. This approach allowed us to express the 3N SRC part of the nuclear spectral function as a convolution of two NN SRCs. Thus the knowledge of 2N SRCs allows us to model both two-and three-nucleon SRC contributions to the spectral function. The derivations of the spectral functions are based on the two theoretical frameworks in evaluating covariant Feynman diagrams: In the first, referred as virtual nucleon approximation, we reduce Feynman diagrams to the time ordered noncovariant diagrams by evaluating nucleon spectators in the SRC at their positive energy poles, neglecting explicitly the contribution from vacuum diagrams. In the second approach, referred as light-front approximation, we formulate the boost invariant nuclear spectral function in the lightfront reference frame in which case the vacuum diagrams are generally suppressed and the bound nucleon is described by its light-cone variables such as momentum fraction, transverse momentum and invariant mass.

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“…We concentrate on the deuteron because it is the simplest nucleus, and because there is now intense experimental interest in a variety of measurements that focus on its wave function. For example, there is much attention on studying the wave function at high momentum transfer [18][19][20]. Another experiment of high interest is the proposed measurement of A zz (JLab LOI12-14-002), available by using a tensor polarized deuteron target, aimed specifically at studying the deuteron wave function [21].…”

Section: Introductionmentioning

confidence: 99%

Meaning of the nuclear wave function

Terry

Miller

2016

Phys. Rev. C

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Background The intense current experimental interest in studying the structure of the deuteron and using it to enable accurate studies of neutron structure motivate us to examine the fourdimensional space-time nature of the nuclear wave function, and the various approximations used to reduce it to an object that depends only on three spatial variables.Purpose The aim is to determine if the ability to understand and analyze measured experimental cross sections is compromised by making the reduction from four to three dimensions.Method Simple, exactly-calculable, covariant models of a bound-state wave state wave function (a scalar boson made of two constituent-scalar bosons) with parameters chosen to represent a deuteron are used to investigate the accuracy of using different approximations to the nuclear wave function to compute the quasi-elastic scattering cross section. Four different versions of the wave function are defined (light-front spectator, light-front, light-front with scaling and non-relativistic) and used to compute the cross sections as a function of how far off the mass-shell (how virtual) is the struck constituent.Results We show that making an exact calculation of the quasi-elastic scattering cross section, involves using the light-front spectator wave function. All of the other approaches fail to reproduce the model exact calculation if the value of Bjorken x differs from unity. The model is extended to consider an essential effect of spin to show that constituent nucleons cannot be treated as being on their mass shell even when taking the matrix element of a 'good' current.Conclusions Developing realistic light-front spectator wave functions to meet the needs of current and planned experiments is a worthwhile activity.

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Modern studies of the Deuteron: From the lab frame to the light front

Cited by 31 publications

References 63 publications

Nuclear final-state interactions in deep inelastic scattering off the lightest nuclei

Nuclear final-state interactions in deep inelastic scattering off the lightest nuclei

Multinucleon short-range correlation model for nuclear spectral functions: Theoretical framework

Meaning of the nuclear wave function

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