Lepton-pair production in virtual Compton scattering off the proton

A. Yu. Korchin; O. Scholten; F. de Jong

doi:10.1016/S0370-2693(97)00389-4

Lepton-pair production in virtual Compton scattering off the proton

A. Yu. Korchin, O. Scholten, F. de Jong

Research output: Contribution to journal › Article › Academic

13 Citations (Scopus)

244 Downloads (Pure)

Abstract

We show that lepton-pair production in virtual Compton scattering offers, through interference with the well-known Bethe-Heitler process, a sensitive probe to separate longitudinal and transverse response at positive photon invariant masses. This interference can be measured directly in terms of an asymmetry. The role of off-shell effects in the NN gamma vertices is investigated as well. An additional NN gamma gamma contact term in the amplitude, included to ensure gauge invariance of the model, cancels a substantial part of the off-shell effects, but introduces ambiguities which affect observables. The response of nucleon resonances is also investigated.

Original language	English
Pages (from-to)	1-6
Number of pages	6
Journal	Physics Letters B
Volume	402
Issue number	1-2
DOIs	https://doi.org/10.1016/S0370-2693(97)00389-4
Publication status	Published - 5-Jun-1997

Keywords

virtual Compton scattering
off-shell form factors
Delta-isobar
ELECTROMAGNETIC FORM-FACTORS
OFF-SHELL NUCLEON
REGION
VERTEX
MESON
MODEL

Access to Document

10.1016/S0370-2693(97)00389-4Licence: Unspecified

Lepton-pair production in virtual Compton scattering off the protonFinal publisher's version, 256 KBLicence: Unspecified

Handle.net

Persistent link

Cite this

@article{29233a5855cb4a70b4b0f7f56052fe01,

title = "Lepton-pair production in virtual Compton scattering off the proton",

abstract = "We show that lepton-pair production in virtual Compton scattering offers, through interference with the well-known Bethe-Heitler process, a sensitive probe to separate longitudinal and transverse response at positive photon invariant masses. This interference can be measured directly in terms of an asymmetry. The role of off-shell effects in the NN gamma vertices is investigated as well. An additional NN gamma gamma contact term in the amplitude, included to ensure gauge invariance of the model, cancels a substantial part of the off-shell effects, but introduces ambiguities which affect observables. The response of nucleon resonances is also investigated. ",

keywords = "virtual Compton scattering, off-shell form factors, Delta-isobar, ELECTROMAGNETIC FORM-FACTORS, OFF-SHELL NUCLEON, REGION, VERTEX, MESON, MODEL",

author = "Korchin, {A. Yu.} and O. Scholten and Jong, {F. de}",

note = "Relation: http://www.rug.nl/ date_submitted:2006 Rights: University of Groningen",

year = "1997",

month = jun,

day = "5",

doi = "10.1016/S0370-2693(97)00389-4",

language = "English",

volume = "402",

pages = "1--6",

journal = "Physics Letters B",

publisher = "ELSEVIER SCIENCE BV",

number = "1-2",

}

TY - JOUR

T1 - Lepton-pair production in virtual Compton scattering off the proton

AU - Korchin, A. Yu.

AU - Scholten, O.

AU - Jong, F. de

N1 - Relation: http://www.rug.nl/ date_submitted:2006 Rights: University of Groningen

PY - 1997/6/5

Y1 - 1997/6/5

N2 - We show that lepton-pair production in virtual Compton scattering offers, through interference with the well-known Bethe-Heitler process, a sensitive probe to separate longitudinal and transverse response at positive photon invariant masses. This interference can be measured directly in terms of an asymmetry. The role of off-shell effects in the NN gamma vertices is investigated as well. An additional NN gamma gamma contact term in the amplitude, included to ensure gauge invariance of the model, cancels a substantial part of the off-shell effects, but introduces ambiguities which affect observables. The response of nucleon resonances is also investigated.

AB - We show that lepton-pair production in virtual Compton scattering offers, through interference with the well-known Bethe-Heitler process, a sensitive probe to separate longitudinal and transverse response at positive photon invariant masses. This interference can be measured directly in terms of an asymmetry. The role of off-shell effects in the NN gamma vertices is investigated as well. An additional NN gamma gamma contact term in the amplitude, included to ensure gauge invariance of the model, cancels a substantial part of the off-shell effects, but introduces ambiguities which affect observables. The response of nucleon resonances is also investigated.

KW - virtual Compton scattering

KW - off-shell form factors

KW - Delta-isobar

KW - ELECTROMAGNETIC FORM-FACTORS

KW - OFF-SHELL NUCLEON

KW - REGION

KW - VERTEX

KW - MESON

KW - MODEL

U2 - 10.1016/S0370-2693(97)00389-4

DO - 10.1016/S0370-2693(97)00389-4

M3 - Article

VL - 402

SP - 1

EP - 6

JO - Physics Letters B

JF - Physics Letters B

IS - 1-2

ER -

Lepton-pair production in virtual Compton scattering off the proton

Abstract

Keywords

Access to Document

Handle.net

Fingerprint

Cite this