Spin density matrix elements in exclusive ω meson muoproduction; European Physical Journal C; Vol. 81, iss. 2

Spin density matrix elements in exclusive ω meson muoproduction; European Physical Journal C; Vol. 81, iss. 2

Bibliografiske detaljer
Parent link:	European Physical Journal C Vol. 81, iss. 2.— 2021.— [126, 22 p.]
Corporate Authors:	Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов, Национальный исследовательский Томский политехнический университет Школа базовой инженерной подготовки Отделение математики и информатики
Andre forfattere:	Alekseev G. D. Georgy Dmitrievich, Alekseev M. G. Maksim, Donskov S. V. Sergey Vasiljevich, Burtsev V. E. Vitaly Evgenjevich, Chumakov A. G. Aleksandr Grigorjevich, Dusaev R. R. Renat Ramilyevich, Lyubovitskiy (Lyubovitskij) V. E. Valery Efimovich, Mamon S. A. Sergey Aleksandrovich, Vasilishin B. I. Bogdan Ivanovich
Summary:	Title screen We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive ωω meson muoproduction on the proton at COMPASS using 160 GeV/c polarised μ+ and μ− 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⟨W⟩=7.6 GeV/c2, and ⟨p2T⟩=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 ωω 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 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 ω production.
Sprog:	engelsk
Udgivet:	2021
Fag:	электронный ресурс труды учёных ТПУ
Online adgang:	https://doi.org/10.1140/epjc/s10052-020-08740-y
Format:	Electronisk Book Chapter
KOHA link:	https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=668070

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