Spin density matrix elements in exclusive ω meson muoproduction
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F21%3A00549445" target="_blank" >RIV/68081731:_____/21:00549445 - isvavai.cz</a>
Alternative codes found
RIV/46747885:24510/23:00012058
Result on the web
<a href="https://link.springer.com/article/10.1140%2Fepjc%2Fs10052-020-08740-y" target="_blank" >https://link.springer.com/article/10.1140%2Fepjc%2Fs10052-020-08740-y</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 ω 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/c(2) < W < 17.0 GeV/c(2), with the average kinematics < Q(2)>= 2.1 (GeV/c)(2), < W >=7.6 GeV/c(2), and < p(T)(2)>=0.16 (GeV/c)(2). Here, Q(2) denotes the virtuality of the exchanged photon, W the mass of the final hadronic system and p(T) 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)> V-L) 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
10303 - Particles and field physics
Result continuities
Project
<a href="/en/project/LM2018104" target="_blank" >LM2018104: Research Infrastructure for experiments at CERN</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
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
1434-6052
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