On the universality of the J = 0 fixed pole contribution in DVCS
S. Brodsky, F.J. Llanes-Estrada and A. Szczepaniak formulated the J = 0 fixed pole universality hypothesis for (deeply) virtual Compton scattering. We show that in the Bjorken limit this hypothesis is equivalent to the validity of the inverse moment sum rule for the D-term form factor. However, any...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2016-01-01
|
| Series: | EPJ Web of Conferences |
| Online Access: | http://dx.doi.org/10.1051/epjconf/201611201016 |
| _version_ | 1818649534974132224 |
|---|---|
| author | Müller D. Semenov-Tian-Shansky K. |
| author_facet | Müller D. Semenov-Tian-Shansky K. |
| author_sort | Müller D. |
| collection | DOAJ |
| description | S. Brodsky, F.J. Llanes-Estrada and A. Szczepaniak formulated the J = 0 fixed pole universality hypothesis for (deeply) virtual Compton scattering. We show that in the Bjorken limit this hypothesis is equivalent to the validity of the inverse moment sum rule for the D-term form factor. However, any supplementary D-term added to a generalized parton distribution (GPD) results in an additional J = 0 fixed pole contribution that violates universality. Unfortunately, one can not provide any reliable theoretical argument excluding the existence of such supplementary D-term. Moreover, the violation of J = 0 fixed pole universality was revealed in field theoretical GPD models. Therefore, J = 0 fixed pole universality hypothesis remains just an external assumption and probably will never be proven theoretically. |
| first_indexed | 2024-12-17T01:35:52Z |
| format | Article |
| id | doaj.art-9ab1ec6c984f4668a30e7e13be1a1200 |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-12-17T01:35:52Z |
| publishDate | 2016-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-9ab1ec6c984f4668a30e7e13be1a12002022-12-21T22:08:28ZengEDP SciencesEPJ Web of Conferences2100-014X2016-01-011120101610.1051/epjconf/201611201016epjconf_poetic2016_01016On the universality of the J = 0 fixed pole contribution in DVCSMüller D.0Semenov-Tian-Shansky K.1Theoretical Physics Division, Rudjer Bošković InstitutePetersburg Nuclear Physics InstituteS. Brodsky, F.J. Llanes-Estrada and A. Szczepaniak formulated the J = 0 fixed pole universality hypothesis for (deeply) virtual Compton scattering. We show that in the Bjorken limit this hypothesis is equivalent to the validity of the inverse moment sum rule for the D-term form factor. However, any supplementary D-term added to a generalized parton distribution (GPD) results in an additional J = 0 fixed pole contribution that violates universality. Unfortunately, one can not provide any reliable theoretical argument excluding the existence of such supplementary D-term. Moreover, the violation of J = 0 fixed pole universality was revealed in field theoretical GPD models. Therefore, J = 0 fixed pole universality hypothesis remains just an external assumption and probably will never be proven theoretically.http://dx.doi.org/10.1051/epjconf/201611201016 |
| spellingShingle | Müller D. Semenov-Tian-Shansky K. On the universality of the J = 0 fixed pole contribution in DVCS EPJ Web of Conferences |
| title | On the universality of the J = 0 fixed pole contribution in DVCS |
| title_full | On the universality of the J = 0 fixed pole contribution in DVCS |
| title_fullStr | On the universality of the J = 0 fixed pole contribution in DVCS |
| title_full_unstemmed | On the universality of the J = 0 fixed pole contribution in DVCS |
| title_short | On the universality of the J = 0 fixed pole contribution in DVCS |
| title_sort | on the universality of the j 0 fixed pole contribution in dvcs |
| url | http://dx.doi.org/10.1051/epjconf/201611201016 |
| work_keys_str_mv | AT mullerd ontheuniversalityofthej0fixedpolecontributionindvcs AT semenovtianshanskyk ontheuniversalityofthej0fixedpolecontributionindvcs |