HEPData

Abstract (data abstract)

CERN-SPS-NA. Exclusive production of $\rho^0$ mesons was studied at the COMPASS experiment by scattering 160 GeV/$c$ muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured as a function of $Q^2$, $x_{Bj}$, or $p_{T}^{2}$. The $\sin \phi_S$ asymmetry is found to be $-0.019 \pm 0.008(stat.) \pm 0.003(syst.)$. All other asymmetries are also found to be of small magnitude and consistent with zero within experimental uncertainties. Very recent calculations using a GPD-based model agree well with the present results. The data is interpreted as evidence for the existence of chiral-odd, transverse generalized parton distributions.

Table 1

Data from F 3

10.17182/hepdata.66743.v1/t1

Single-spin azimuthal asymmetries for a transversely (T) polarised target and unpolarised (U) beam.
https://www.hepdata.net/record/data/58926yaml https://www.hepdata.net/record/data/58926/csvcsv
Table 2

Data from F 3

10.17182/hepdata.66743.v1/t2

Single-spin azimuthal asymmetries for a transversely (T) polarised target and unpolarised (U) beam.
https://www.hepdata.net/record/data/58927yaml https://www.hepdata.net/record/data/58927/csvcsv
Table 3

Data from F 3

10.17182/hepdata.66743.v1/t3

Single-spin azimuthal asymmetries for a transversely (T) polarised target and unpolarised (U) beam.
https://www.hepdata.net/record/data/58928yaml https://www.hepdata.net/record/data/58928/csvcsv
Table 4

Data from F 4

10.17182/hepdata.66743.v1/t4

Double-spin azimuthal asymmetries for a transversely (T) polarised target and a longitudinally (L) polarised beam.
https://www.hepdata.net/record/data/58929yaml https://www.hepdata.net/record/data/58929/csvcsv
Table 5

Data from F 4

10.17182/hepdata.66743.v1/t5

Double-spin azimuthal asymmetries for a transversely (T) polarised target and a longitudinally (L) polarised beam.
https://www.hepdata.net/record/data/58930yaml https://www.hepdata.net/record/data/58930/csvcsv
Table 6

Data from F 4

10.17182/hepdata.66743.v1/t6

Double-spin azimuthal asymmetries for a transversely (T) polarised target and a longitudinally (L) polarised beam.
https://www.hepdata.net/record/data/58931yaml https://www.hepdata.net/record/data/58931/csvcsv

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