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Recent results from COMPASS on the GPD program
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| Zeitschriftentitel: | EPJ Web of Conferences |
|---|---|
| Personen und Körperschaften: | |
| In: | EPJ Web of Conferences, 192, 2018, S. 00012 |
| Format: | E-Article |
| Sprache: | Unbestimmt |
| veröffentlicht: |
EDP Sciences
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| Schlagwörter: |
| author_facet |
Sandacz, Andrzej Sandacz, Andrzej |
|---|---|
| author |
Sandacz, Andrzej |
| spellingShingle |
Sandacz, Andrzej EPJ Web of Conferences Recent results from COMPASS on the GPD program General Earth and Planetary Sciences General Engineering General Environmental Science |
| author_sort |
sandacz, andrzej |
| spelling |
Sandacz, Andrzej 2100-014X EDP Sciences General Earth and Planetary Sciences General Engineering General Environmental Science http://dx.doi.org/10.1051/epjconf/201819200012 <jats:p>The dedicated COMPASS GPD program started in 2012 with a short pilot ’DVCS run’ and the first results from this run on DVCS, exclusive <jats:italic>π</jats:italic><jats:sup>0</jats:sup> and exclusive <jats:italic>ω</jats:italic> channels have been obtained. From the sum of cross sections measured with positive and negative beam polarities the DVCS cross-section and its dependence on the squared four-momentum transfer <jats:italic>t</jats:italic> have been extracted. It allowed a first estimate of the transverse size of the partonic distribution of the nucleon √〈r<jats:sup>2</jats:sup>⊥〉 i in a range of intermediate <jats:italic><jats:sup>x</jats:sup>B<jats:sub>j</jats:sub></jats:italic> with a mean <jats:italic><jats:sup>x</jats:sup>B<jats:sub>j</jats:sub></jats:italic> value of 0.056. We report also on the absolute value of the cross section for exclusive <jats:italic>π</jats:italic><jats:sup>0</jats:sup> production and its dependence on <jats:italic>t</jats:italic> and azimuthal angle <jats:italic>ϕ</jats:italic> between the scattering plane and <jats:italic>π</jats:italic><jats:sup>0</jats:sup> production plane. These measurements are aiming to constrain the GPDs, in particular chiral-odd (transversity) GPDs. Further, we present results on the spin density matrix elements for exclusive <jats:italic>ω</jats:italic> meson production and discuss the contributions from unnaturaly parity exchanges and from transitions that do not conserve helicity.</jats:p> Recent results from COMPASS on the GPD program EPJ Web of Conferences |
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EPJ Web of Conferences |
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| title |
Recent results from COMPASS on the GPD program |
| title_unstemmed |
Recent results from COMPASS on the GPD program |
| title_full |
Recent results from COMPASS on the GPD program |
| title_fullStr |
Recent results from COMPASS on the GPD program |
| title_full_unstemmed |
Recent results from COMPASS on the GPD program |
| title_short |
Recent results from COMPASS on the GPD program |
| title_sort |
recent results from compass on the gpd program |
| topic |
General Earth and Planetary Sciences General Engineering General Environmental Science |
| url |
http://dx.doi.org/10.1051/epjconf/201819200012 |
| publishDate |
2018 |
| physical |
00012 |
| description |
<jats:p>The dedicated COMPASS GPD program started in 2012 with a short pilot ’DVCS run’ and the first results from this run on DVCS, exclusive <jats:italic>π</jats:italic><jats:sup>0</jats:sup> and exclusive <jats:italic>ω</jats:italic> channels have been obtained. From the sum of cross sections measured with positive and negative beam polarities the DVCS cross-section and its dependence on the squared four-momentum transfer <jats:italic>t</jats:italic> have been extracted. It allowed a first estimate of the transverse size of the partonic distribution of the nucleon √〈r<jats:sup>2</jats:sup>⊥〉 i in a range of intermediate <jats:italic><jats:sup>x</jats:sup>B<jats:sub>j</jats:sub></jats:italic> with a mean <jats:italic><jats:sup>x</jats:sup>B<jats:sub>j</jats:sub></jats:italic> value of 0.056. We report also on the absolute value of the cross section for exclusive <jats:italic>π</jats:italic><jats:sup>0</jats:sup> production and its dependence on <jats:italic>t</jats:italic> and azimuthal angle <jats:italic>ϕ</jats:italic> between the scattering plane and <jats:italic>π</jats:italic><jats:sup>0</jats:sup> production plane. These measurements are aiming to constrain the GPDs, in particular chiral-odd (transversity) GPDs. Further, we present results on the spin density matrix elements for exclusive <jats:italic>ω</jats:italic> meson production and discuss the contributions from unnaturaly parity exchanges and from transitions that do not conserve helicity.</jats:p> |
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| description | <jats:p>The dedicated COMPASS GPD program started in 2012 with a short pilot ’DVCS run’ and the first results from this run on DVCS, exclusive <jats:italic>π</jats:italic><jats:sup>0</jats:sup> and exclusive <jats:italic>ω</jats:italic> channels have been obtained. From the sum of cross sections measured with positive and negative beam polarities the DVCS cross-section and its dependence on the squared four-momentum transfer <jats:italic>t</jats:italic> have been extracted. It allowed a first estimate of the transverse size of the partonic distribution of the nucleon √〈r<jats:sup>2</jats:sup>⊥〉 i in a range of intermediate <jats:italic><jats:sup>x</jats:sup>B<jats:sub>j</jats:sub></jats:italic> with a mean <jats:italic><jats:sup>x</jats:sup>B<jats:sub>j</jats:sub></jats:italic> value of 0.056. We report also on the absolute value of the cross section for exclusive <jats:italic>π</jats:italic><jats:sup>0</jats:sup> production and its dependence on <jats:italic>t</jats:italic> and azimuthal angle <jats:italic>ϕ</jats:italic> between the scattering plane and <jats:italic>π</jats:italic><jats:sup>0</jats:sup> production plane. These measurements are aiming to constrain the GPDs, in particular chiral-odd (transversity) GPDs. Further, we present results on the spin density matrix elements for exclusive <jats:italic>ω</jats:italic> meson production and discuss the contributions from unnaturaly parity exchanges and from transitions that do not conserve helicity.</jats:p> |
| doi_str_mv | 10.1051/epjconf/201819200012 |
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| institution | DE-L229, DE-D275, DE-Bn3, DE-Brt1, DE-Zwi2, DE-D161, DE-Gla1, DE-Zi4, DE-15, DE-Pl11, DE-Rs1, DE-105, DE-14, DE-Ch1 |
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| spelling | Sandacz, Andrzej 2100-014X EDP Sciences General Earth and Planetary Sciences General Engineering General Environmental Science http://dx.doi.org/10.1051/epjconf/201819200012 <jats:p>The dedicated COMPASS GPD program started in 2012 with a short pilot ’DVCS run’ and the first results from this run on DVCS, exclusive <jats:italic>π</jats:italic><jats:sup>0</jats:sup> and exclusive <jats:italic>ω</jats:italic> channels have been obtained. From the sum of cross sections measured with positive and negative beam polarities the DVCS cross-section and its dependence on the squared four-momentum transfer <jats:italic>t</jats:italic> have been extracted. It allowed a first estimate of the transverse size of the partonic distribution of the nucleon √〈r<jats:sup>2</jats:sup>⊥〉 i in a range of intermediate <jats:italic><jats:sup>x</jats:sup>B<jats:sub>j</jats:sub></jats:italic> with a mean <jats:italic><jats:sup>x</jats:sup>B<jats:sub>j</jats:sub></jats:italic> value of 0.056. We report also on the absolute value of the cross section for exclusive <jats:italic>π</jats:italic><jats:sup>0</jats:sup> production and its dependence on <jats:italic>t</jats:italic> and azimuthal angle <jats:italic>ϕ</jats:italic> between the scattering plane and <jats:italic>π</jats:italic><jats:sup>0</jats:sup> production plane. These measurements are aiming to constrain the GPDs, in particular chiral-odd (transversity) GPDs. Further, we present results on the spin density matrix elements for exclusive <jats:italic>ω</jats:italic> meson production and discuss the contributions from unnaturaly parity exchanges and from transitions that do not conserve helicity.</jats:p> Recent results from COMPASS on the GPD program EPJ Web of Conferences |
| spellingShingle | Sandacz, Andrzej, EPJ Web of Conferences, Recent results from COMPASS on the GPD program, General Earth and Planetary Sciences, General Engineering, General Environmental Science |
| title | Recent results from COMPASS on the GPD program |
| title_full | Recent results from COMPASS on the GPD program |
| title_fullStr | Recent results from COMPASS on the GPD program |
| title_full_unstemmed | Recent results from COMPASS on the GPD program |
| title_short | Recent results from COMPASS on the GPD program |
| title_sort | recent results from compass on the gpd program |
| title_unstemmed | Recent results from COMPASS on the GPD program |
| topic | General Earth and Planetary Sciences, General Engineering, General Environmental Science |
| url | http://dx.doi.org/10.1051/epjconf/201819200012 |