The Diquark Model for Exclusive Reactions

Kroll, P.

doi:10.1007/978-3-7091-6800-4_41

“…The pQCD calculation is simplified to only hundreds of diagrams in the quark-diquark model of the nucleon [128,129]. Diquarks may be viewed as effective quasi-elementary particles that incorporate some nonperturbative physics of the nucleon, for reactions in which the interaction is primarily with a single quark.…”

Section: Photo-pion Reactions Meson Production Reactionsmentioning

confidence: 99%

Transition between nuclear and quark–gluon descriptions of hadrons and light nuclei

Gilman

¹

2012

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We provide a perspective on studies aimed at observing the transition between hadronic and quark-gluonic descriptions of reactions involving light nuclei. We begin by summarizing the results for relatively simple reactions such as the pion form factor and the neutral pion transition form factor as well as that for the nucleon and end with exclusive photoreactions in our simplest nuclei. A particular focus will be on reactions involving the deuteron. It is noted that a firm understanding of these issues is essential for unravelling important structure information from processes such as deeply virtual Compton scattering as well as deeply virtual meson production. The connection to exotic phenomena such as color transparency will be discussed. A number of outstanding challenges will require new experiments at modern facilities on the horizon as well as further theoretical developments.

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“…(1). From the fact that the violation fades away as one moves away from the couplers indicates that the effect is due to the couplers generating an evanescent band, the nearby monopole band pointed out in [3]. This example demonstrates how the method indicates the presence of evanescent band interference, and also how one can carry out the matching procedure even when it is present.…”

Section: (C) the Zipper Structurementioning

confidence: 78%

“…The zipper is a planar accelerator structure described in [3]. A 25 (counting the coupler cavities) cell W band model has been built, cold tested, and subjected to bead pull measurements as reported in [7].…”

Section: (C) the Zipper Structurementioning

confidence: 99%

“…In the next section we describe a new simulation procedure which has been found to be much more efficient, and also which provides information about the presence of evanescent bands. The basic elements of the method were briefly described in [3] in connection with the design of a coupler for the zipper structure. Because it has since replaced the old method for all of our coupler design work, a more complete presentation together with examples will be presented in the following sections.…”

Section: Introductionmentioning

confidence: 99%

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Applications of Time Domain Simulation to Coupler Design for Periodic Structures

Kroll¹

2000

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We present numerical procedures for analyzing the properties of periodic structures and associated couplers based upon time domain simulation. Simple post processing procedures are given for determining Brillouin diagrams and complex field distributions of the traveling wave solutions, and the reflection coefficient of the traveling waves by the input and output. The availability of the reflection coefficient information facilitates a systematic and efficient procedure for matching the input and output. The method has been extensively applied to coupler design for a wide variety of structures and to a study directed towards elimination of the surface field enhancement commonly experienced in coupler cells.

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“…The pQCD calculation is simplified to only hundreds of diagrams in the quarkdiquark model of the nucleon [128,129]. Diquarks may be viewed as an effective quasielementary particles that incorporate some nonperturbative physics of the nucleon, for reactions in which the interaction is primarily with a single quark.…”

Section: Photo-pion Reactionsmentioning

confidence: 99%

Transition between nuclear and quark-gluon descriptions of hadrons and light nuclei

Holt,

Gilman

2012

Preprint

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We provide a perspective on studies aimed at observing the transition between hadronic and quark-gluonic descriptions of reactions involving light nuclei. We begin by summarizing the results for relatively simple reactions such as the pion form factor and the neutral pion transition form factor as well as that for the nucleon and end with exclusive photoreactions in our simplest nuclei. A particular focus will be on reactions involving the deuteron. It is noted that a firm understanding of these issues is essential for unravelling important structure information from processes such as deeply virtual Compton scattering as well as deeply virtual meson production. The connection to exotic phenomena such as color transparency will be discussed. A number of outstanding challenges will require new experiments at modern facilities on the horizon as well as further theoretical developments.

show abstract

The Diquark Model for Exclusive Reactions

Cited by 8 publications

References 21 publications

Transition between nuclear and quark–gluon descriptions of hadrons and light nuclei

Transition between nuclear and quark–gluon descriptions of hadrons and light nuclei

Applications of Time Domain Simulation to Coupler Design for Periodic Structures

Transition between nuclear and quark-gluon descriptions of hadrons and light nuclei

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