• Browse all
Transverse target spin asymmetries in exclusive $\rho^0$ muoproduction

The COMPASS collaboration
Phys.Lett. B731 (2014) 19-26, 2014

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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

Loading Data...