Spin density matrix elements in exclusive omega meson muoproduction
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10430869" target="_blank" >RIV/00216208:11320/21:10430869 - isvavai.cz</a>
Alternative codes found
RIV/46747885:24510/21:00009606 RIV/68407700:21340/21:00347457
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=i82hYH41LI" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=i82hYH41LI</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1140/epjc/s10052-020-08740-y" target="_blank" >10.1140/epjc/s10052-020-08740-y</a>
Alternative languages
Result language
angličtina
Original language name
Spin density matrix elements in exclusive omega meson muoproduction
Original language description
We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive omega meson muoproduction on the proton at COMPASS using 160 GeV/c polarised mu+ and mu- beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/c2<W< 17.0 GeV/c2, with the average kinematics Q2= 2.1 (GeV/c)2, W=7.6 GeV/c2, and pT2</mml:msubsup>=0.16 (GeV/c)2. Here, Q2 denotes the virtuality of the exchanged photon, W the mass of the final hadronic system and pT the transverse momentum of the omega meson with respect to the virtual-photon direction. The measured non-zero SDMEs for the transitions of transversely polarised virtual photons to longitudinally polarised vector mesons (gamma T -> <mml:msub>VL) indicate a violation of s-channel helicity conservation. Additionally, we observe a sizeable contribution of unnatural-parity-exchange (UPE) transitions that decreases with increasing W. The results provide important input for modelling Generalised Parton Distributions (GPDs). In particular, they may allow to evaluate in a model-dependent way the contribution of UPE transitions and assess the role of parton helicity-flip GPDs in exclusive omega production.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10300 - Physical sciences
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
European Physical Journal C
ISSN
1434-6044
e-ISSN
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Volume of the periodical
81
Issue of the periodical within the volume
2
Country of publishing house
DE - GERMANY
Number of pages
22
Pages from-to
126
UT code for WoS article
000617390500004
EID of the result in the Scopus database
2-s2.0-85107340629