Target single- And double-spin asymmetries in DVCS off a longitudinal polarized hydrogen target at HERMES

David Mahon; Caroline Kathrin Riedl

Target single- And double-spin asymmetries in DVCS off a longitudinal polarized hydrogen target at HERMES

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Abstract

We present recently-published HERMES asymmetry measurements for the hard exclusive lep- Toproduction of real photons from a longitudinally polarised hydrogen target using a 27.57 GeV longitudinally polarised HERA positron beam. These asymmetries arise from the deeply virtual Compton scattering and Bethe-Heitler processes. Two asymmetries are simultaneously extracted in the azimuthal distribution of produced real photons about the direction of the exchanged pho- Ton: A_UL with respect to the polarisation of the target and A_LL with respect to the product of the beam and target polarisations. The results are presented in comparison with predictions from a generalised parton distribution model. The sinΦ and cos(0Φ ) modulations of the A_UL and A_LL respectively, are observed to be compatible with the predictions from this model. An unexpected sin(2Φ) amplitude is also observed for A_UL.

Original language	English (US)
Journal	Proceedings of Science
State	Published - 2010
Externally published	Yes

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title = "Target single- And double-spin asymmetries in DVCS off a longitudinal polarized hydrogen target at HERMES",

abstract = "We present recently-published HERMES asymmetry measurements for the hard exclusive lep- Toproduction of real photons from a longitudinally polarised hydrogen target using a 27.57 GeV longitudinally polarised HERA positron beam. These asymmetries arise from the deeply virtual Compton scattering and Bethe-Heitler processes. Two asymmetries are simultaneously extracted in the azimuthal distribution of produced real photons about the direction of the exchanged pho- Ton: AUL with respect to the polarisation of the target and ALL with respect to the product of the beam and target polarisations. The results are presented in comparison with predictions from a generalised parton distribution model. The sinΦ and cos(0Φ ) modulations of the AUL and ALL respectively, are observed to be compatible with the predictions from this model. An unexpected sin(2Φ) amplitude is also observed for AUL.",

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year = "2010",

language = "English (US)",

journal = "Proceedings of Science",

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T1 - Target single- And double-spin asymmetries in DVCS off a longitudinal polarized hydrogen target at HERMES

AU - Mahon, David

AU - Riedl, Caroline Kathrin

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N2 - We present recently-published HERMES asymmetry measurements for the hard exclusive lep- Toproduction of real photons from a longitudinally polarised hydrogen target using a 27.57 GeV longitudinally polarised HERA positron beam. These asymmetries arise from the deeply virtual Compton scattering and Bethe-Heitler processes. Two asymmetries are simultaneously extracted in the azimuthal distribution of produced real photons about the direction of the exchanged pho- Ton: AUL with respect to the polarisation of the target and ALL with respect to the product of the beam and target polarisations. The results are presented in comparison with predictions from a generalised parton distribution model. The sinΦ and cos(0Φ ) modulations of the AUL and ALL respectively, are observed to be compatible with the predictions from this model. An unexpected sin(2Φ) amplitude is also observed for AUL.

AB - We present recently-published HERMES asymmetry measurements for the hard exclusive lep- Toproduction of real photons from a longitudinally polarised hydrogen target using a 27.57 GeV longitudinally polarised HERA positron beam. These asymmetries arise from the deeply virtual Compton scattering and Bethe-Heitler processes. Two asymmetries are simultaneously extracted in the azimuthal distribution of produced real photons about the direction of the exchanged pho- Ton: AUL with respect to the polarisation of the target and ALL with respect to the product of the beam and target polarisations. The results are presented in comparison with predictions from a generalised parton distribution model. The sinΦ and cos(0Φ ) modulations of the AUL and ALL respectively, are observed to be compatible with the predictions from this model. An unexpected sin(2Φ) amplitude is also observed for AUL.

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Target single- And double-spin asymmetries in DVCS off a longitudinal polarized hydrogen target at HERMES

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