TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhysProc.8.073
TI  - Spin Density Matrix Elements for Exclusive $\rho^{0}$ Meson Muoproduction at COMPASS
PY  - 2022/07/12
UR  - https://scipost.org/SciPostPhysProc.8.073
JF  - SciPost Physics Proceedings
JA  - SciPost Phys. Proc.
VL  - 
IS  - 8
SP  - 073
A1  - Augustyniak, Witold
AB  - Spin density matrix elements were extracted from COMPASS data for exclusive $\rho^{0}$ meson muoproduction on a liquid hydrogen target. The measurement cover the kinematic range of 1.0 (GeV/$c$)$^2$ $< Q^{2} <$ 10.0 (GeV/$c$)$^2$, 5.0 GeV/$c^2$ $< W <$ 17.0 GeV/$c^2$ and 0.01 (GeV/$c$)$^2$ $<p^{2}_{T} < $ 0.5 (GeV/$c$)$^2$. Here, $W$ denotes the mass of the final hadronic system, $Q^{2}$ the virtuality of the exchanged photon and $p_{T}$ the transverse momentum of the $\rho^{0}$ meson with respect to the virtual-photon direction. We observe a violation of s-channel helicity conservation for the transition $\gamma^{*}_{T} \to \rho^{0}_{L}$. Additionally, we find a dominant contribution of the natural-parity-exchange transitions.
ER  -

@Article{10.21468/SciPostPhysProc.8.073,
	title={{Spin Density Matrix Elements for Exclusive $\rho^{0}$ Meson Muoproduction at COMPASS}},
	author={W.~Augustyniak},
	journal={SciPost Phys. Proc.},
	pages={073},
	year={2022},
	publisher={SciPost},
	doi={10.21468/SciPostPhysProc.8.073},
	url={https://scipost.org/10.21468/SciPostPhysProc.8.073},
}