Electromagnetic properties of off-shell particles and gauge invariance
Electromagnetic properties of off-shell particles are discussed on the basis of a purely electromagnetic reaction: virtual Compton scattering off a proton. It is shown that the definition of off-shell electromagnetic form factors is not gauge invariant and that these cannot be investigated in practi...
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| creator | Nagorny, S. I Dieperink, A. E. L |
| description | Electromagnetic properties of off-shell particles are discussed on the basis
of a purely electromagnetic reaction: virtual Compton scattering off a proton.
It is shown that the definition of off-shell electromagnetic form factors is
not gauge invariant and that these cannot be investigated in practice. Using
only fundamental requirements of gauge invariance it is demonstrated that
off-shell effects are cancelled in the longitudinal components of the total
conserved current by the minimal contact current, while the off-shellness
appears only in the the transverse (gauge invariant) non-pole part. This
provides the possibility to introduce an on-shell extrapolated form factor
F_1^+(q^2) in a gauge invariant way for the unphysical time-like region,
4m_e^2 |
| doi_str_mv | 10.48550/arxiv.nucl-th/9803007 |
| format | Article |
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of a purely electromagnetic reaction: virtual Compton scattering off a proton.
It is shown that the definition of off-shell electromagnetic form factors is
not gauge invariant and that these cannot be investigated in practice. Using
only fundamental requirements of gauge invariance it is demonstrated that
off-shell effects are cancelled in the longitudinal components of the total
conserved current by the minimal contact current, while the off-shellness
appears only in the the transverse (gauge invariant) non-pole part. This
provides the possibility to introduce an on-shell extrapolated form factor
F_1^+(q^2) in a gauge invariant way for the unphysical time-like region,
4m_e^2<q^2, 4M_N^2.</description><identifier>DOI: 10.48550/arxiv.nucl-th/9803007</identifier><language>eng</language><subject>Physics - Nuclear Theory</subject><creationdate>1998-03</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>228,230,776,881</link.rule.ids><linktorsrc>$$Uhttps://arxiv.org/abs/nucl-th/9803007$$EView_record_in_Cornell_University$$FView_record_in_$$GCornell_University$$Hfree_for_read</linktorsrc><backlink>$$Uhttps://doi.org/10.48550/arXiv.nucl-th/9803007$$DView paper in arXiv$$Hfree_for_read</backlink></links><search><creatorcontrib>Nagorny, S. I</creatorcontrib><creatorcontrib>Dieperink, A. E. L</creatorcontrib><title>Electromagnetic properties of off-shell particles and gauge invariance</title><description>Electromagnetic properties of off-shell particles are discussed on the basis
of a purely electromagnetic reaction: virtual Compton scattering off a proton.
It is shown that the definition of off-shell electromagnetic form factors is
not gauge invariant and that these cannot be investigated in practice. Using
only fundamental requirements of gauge invariance it is demonstrated that
off-shell effects are cancelled in the longitudinal components of the total
conserved current by the minimal contact current, while the off-shellness
appears only in the the transverse (gauge invariant) non-pole part. This
provides the possibility to introduce an on-shell extrapolated form factor
F_1^+(q^2) in a gauge invariant way for the unphysical time-like region,
4m_e^2<q^2, 4M_N^2.</description><subject>Physics - Nuclear Theory</subject><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1998</creationdate><recordtype>article</recordtype><sourceid>GOX</sourceid><recordid>eNotj7FqwzAURbV0KGl_oWjIqkS2ZEkeS0jaQqBLdvMiPdkCRTayEtq_r9sGLlw4w-UeQl4qvpGmafgW8le4bdLVRlaGbWu44Fw_ksM-oi15vECfsARLpzxOmEvAmY5-iWfzgDHSCRZo44IhOdrDtUca0g1ygGTxiTx4iDM-33tFTof9affOjp9vH7vXIwOtNRNen2VlULkzdy04WaFSGlBKp5RyRtTKGuttrWtvWuesM1I0Cpb_Fp2sxYqs_2f_bLophwvk7-7XqitDd7cSPzscS-w</recordid><startdate>19980302</startdate><enddate>19980302</enddate><creator>Nagorny, S. I</creator><creator>Dieperink, A. E. L</creator><scope>GOX</scope></search><sort><creationdate>19980302</creationdate><title>Electromagnetic properties of off-shell particles and gauge invariance</title><author>Nagorny, S. I ; Dieperink, A. E. L</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a777-3f7b418e6db0d9ad41e667ae44d666d8326c8cfc272f89ddcd84356a550ced423</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1998</creationdate><topic>Physics - Nuclear Theory</topic><toplevel>online_resources</toplevel><creatorcontrib>Nagorny, S. I</creatorcontrib><creatorcontrib>Dieperink, A. E. L</creatorcontrib><collection>arXiv.org</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Nagorny, S. I</au><au>Dieperink, A. E. L</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Electromagnetic properties of off-shell particles and gauge invariance</atitle><date>1998-03-02</date><risdate>1998</risdate><abstract>Electromagnetic properties of off-shell particles are discussed on the basis
of a purely electromagnetic reaction: virtual Compton scattering off a proton.
It is shown that the definition of off-shell electromagnetic form factors is
not gauge invariant and that these cannot be investigated in practice. Using
only fundamental requirements of gauge invariance it is demonstrated that
off-shell effects are cancelled in the longitudinal components of the total
conserved current by the minimal contact current, while the off-shellness
appears only in the the transverse (gauge invariant) non-pole part. This
provides the possibility to introduce an on-shell extrapolated form factor
F_1^+(q^2) in a gauge invariant way for the unphysical time-like region,
4m_e^2<q^2, 4M_N^2.</abstract><doi>10.48550/arxiv.nucl-th/9803007</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Physics - Nuclear Theory |
| title | Electromagnetic properties of off-shell particles and gauge invariance |
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