Spin density matrix elements in exclusive ρ0 meson muoproduction
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F23%3A00579249" target="_blank" >RIV/68081731:_____/23:00579249 - isvavai.cz</a>
Alternative codes found
RIV/68407700:21340/23:00371107 RIV/00216208:11320/23:10476524
Result on the web
<a href="https://link.springer.com/article/10.1140/epjc/s10052-023-11359-4" target="_blank" >https://link.springer.com/article/10.1140/epjc/s10052-023-11359-4</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1140/epjc/s10052-023-11359-4" target="_blank" >10.1140/epjc/s10052-023-11359-4</a>
Alternative languages
Result language
angličtina
Original language name
Spin density matrix elements in exclusive ρ0 meson muoproduction
Original language description
We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive ρ0 meson muoproduction at COMPASS using 160~GeV/c polarised μ+ and μ− beams impinging on a liquid hydrogen target. The measurement covers the kinematic range 5.0~GeV/c2 <W< 17.0~GeV/c2, 1.0 (GeV/c)2 <Q2< 10.0 (GeV/c)2 and 0.01 (GeV/c)2 <p2T< 0.5 (GeV/c)2. Here, W denotes the mass of the final hadronic system, Q2 the virtuality of the exchanged photon, and pT the transverse momentum of the ρ0 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 (γ∗T→VL) indicate a violation of s-channel helicity conservation. Additionally, we observe a dominant contribution of natural-parity-exchange transitions and a very small contribution of unnatural-parity-exchange transitions, which is compatible with zero within experimental uncertainties. The results provide important input for modelling Generalised Parton Distributions (GPDs). In particular, they may allow one to evaluate in a model-dependent way the role of parton helicity-flip GPDs in exclusive ρ0 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
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2023
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
83
Issue of the periodical within the volume
10
Country of publishing house
DE - GERMANY
Number of pages
25
Pages from-to
924
UT code for WoS article
001095775200001
EID of the result in the Scopus database
2-s2.0-85174592149