Cargando…

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...

Descripción completa

Detalles Bibliográficos
Autor principal: Marianski, Bohdan
Lenguaje:eng
Publicado: SISSA 2019
Materias:
Acceso en línea:https://dx.doi.org/10.22323/1.346.0073
http://cds.cern.ch/record/2834880
_version_ 1780975616894435328
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