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Spin-density matrix elements in hard exclusive muoproduction of $\omega$ mesons at COMPASS
Spin density matrix elements (SDMEs) have been determined forexclusive$\omega$ meson production on unpolarized protons, in the COMPASSkinematic region of 1.0 (GeV/c)$^2$ $< Q^{2} <$ 10.0 (GeV/c)$^2$, 5.0GeV/$c^2$ $< W <$ 17.0 GeV/$c^2$ and0.01 (GeV/c)$^2$ $<p^{2}_{T} < $ 0.5 (GeV/c...
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Lenguaje: | eng |
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SISSA
2019
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Acceso en línea: | https://dx.doi.org/10.22323/1.346.0073 http://cds.cern.ch/record/2834880 |
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author | Marianski, Bohdan |
author_facet | Marianski, Bohdan |
author_sort | Marianski, Bohdan |
collection | CERN |
description | Spin density matrix elements (SDMEs) have been determined forexclusive$\omega$ meson production on unpolarized protons, in the COMPASSkinematic region of 1.0 (GeV/c)$^2$ $< Q^{2} <$ 10.0 (GeV/c)$^2$, 5.0GeV/$c^2$ $< W <$ 17.0 GeV/$c^2$ and0.01 (GeV/c)$^2$ $<p^{2}_{T} < $ 0.5 (GeV/c)$^2$ which corresponds to$\left< Q^{2} \right>= 2.1$~(GeV/c)$^2$), $\left< W \right>= 7.6$~GeV/$c^2$and$\left<p^{2}_{T} \right> = 0.16$~(GeV/c)$^2$) mean values.Using extracted SDMEs values the contribution of unnatural parity exchangeamplitudes andthe hypothesis of s-channel helicity conservation (SCHC) werestudied. Certain matrix elements e.g. $ r^{5}_{00}$ corresponding totransition $\gamma^*_T \to V_L$ indicate violation of SCHC in exclusive $\omega $ production.A sizable contribution of unnatural parity exchange amplitudes is found for the exclusive $\omega$ meson muoproduction, and there is aclearindication of its decrease with increasing W. |
id | cern-2834880 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2019 |
publisher | SISSA |
record_format | invenio |
spelling | cern-28348802022-10-05T13:13:42Zdoi:10.22323/1.346.0073http://cds.cern.ch/record/2834880engMarianski, BohdanSpin-density matrix elements in hard exclusive muoproduction of $\omega$ mesons at COMPASSParticle Physics - ExperimentSpin density matrix elements (SDMEs) have been determined forexclusive$\omega$ meson production on unpolarized protons, in the COMPASSkinematic region of 1.0 (GeV/c)$^2$ $< Q^{2} <$ 10.0 (GeV/c)$^2$, 5.0GeV/$c^2$ $< W <$ 17.0 GeV/$c^2$ and0.01 (GeV/c)$^2$ $<p^{2}_{T} < $ 0.5 (GeV/c)$^2$ which corresponds to$\left< Q^{2} \right>= 2.1$~(GeV/c)$^2$), $\left< W \right>= 7.6$~GeV/$c^2$and$\left<p^{2}_{T} \right> = 0.16$~(GeV/c)$^2$) mean values.Using extracted SDMEs values the contribution of unnatural parity exchangeamplitudes andthe hypothesis of s-channel helicity conservation (SCHC) werestudied. Certain matrix elements e.g. $ r^{5}_{00}$ corresponding totransition $\gamma^*_T \to V_L$ indicate violation of SCHC in exclusive $\omega $ production.A sizable contribution of unnatural parity exchange amplitudes is found for the exclusive $\omega$ meson muoproduction, and there is aclearindication of its decrease with increasing W.SISSAoai:cds.cern.ch:28348802019 |
spellingShingle | Particle Physics - Experiment Marianski, Bohdan Spin-density matrix elements in hard exclusive muoproduction of $\omega$ mesons at COMPASS |
title | Spin-density matrix elements in hard exclusive muoproduction of $\omega$ mesons at COMPASS |
title_full | Spin-density matrix elements in hard exclusive muoproduction of $\omega$ mesons at COMPASS |
title_fullStr | Spin-density matrix elements in hard exclusive muoproduction of $\omega$ mesons at COMPASS |
title_full_unstemmed | Spin-density matrix elements in hard exclusive muoproduction of $\omega$ mesons at COMPASS |
title_short | Spin-density matrix elements in hard exclusive muoproduction of $\omega$ mesons at COMPASS |
title_sort | spin-density matrix elements in hard exclusive muoproduction of $\omega$ mesons at compass |
topic | Particle Physics - Experiment |
url | https://dx.doi.org/10.22323/1.346.0073 http://cds.cern.ch/record/2834880 |
work_keys_str_mv | AT marianskibohdan spindensitymatrixelementsinhardexclusivemuoproductionofomegamesonsatcompass |