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Polarization measurements in high-energy deuteron photodisintegration

Wijesooriya, K. and Gao, J. and Jones, C. (2001) Polarization measurements in high-energy deuteron photodisintegration. Physical Review Letters, 86 (14). pp. 2975-2979. ISSN 0031-9007. doi:10.1103/PhysRevLett.86.2975.

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We present measurements of the recoil proton polarization for the d(γ⃗,p⃗)n reaction at θ_(c.m.) = 90° for photon energies up to 2.4 GeV. These are the first data in this reaction for polarization transfer with circularly polarized photons. The induced polarization p_y vanishes above 1 GeV, contrary to meson-baryon model expectations, in which resonances lead to large polarizations. However, the polarization transfer C_x does not vanish above 1 GeV, inconsistent with hadron helicity conservation. Thus, we show that the scaling behavior observed in the d(γ,p)n cross sections is not a result of perturbative QCD. These data should provide important tests of new nonperturbative calculations in the intermediate energy regime.

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Additional Information:© 2001 The American Physical Society. Received 15 September 2000; revised manuscript received 19 December 2000. We thank G. Farrar, N. Isgur, G.A. Miller, A. Radyushkin, J. Ralston, and M. Sargsian for many interesting discussions. We thank M. Sargsian for allowing us to mention his results prior to publication. We thank the JLab physics and accelerator divisions for their support, especially Ed Folts and the Hall A technical staff, and Charlie Sinclair and the polarized source group. This work was supported by the U.S. Department of Energy, the U.S. National Science Foundation, the Natural Sciences and Engineering Research Council of Canada, the French Commissariat à l’Energie Atomique and Centre National de la Recherche Scientifique, the Italian National Institute for Nuclear Physics, and the Swedish Natural Science Research Council. The Southeastern Universities Research Association (SURA) operates the Thomas Jefferson National Accelerator Facility under DOE Contract No. DE-AC05-84ER40150. The polarimeter was funded by the U.S. National Science Foundation, Grants No. PHY 9213864 and No. PHY 9213869.
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Commissariat à l’Energie Atomique (CEA) (France)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS) (France)UNSPECIFIED
Italian National Institute for Nuclear Physics (INFN)UNSPECIFIED
Swedish Natural Science Research CouncilUNSPECIFIED
Department of Energy (DOE)DE-AC05-84ER40150
Issue or Number:14
Classification Code:PACS: 25.20.-x, 24.70.+s, 24.85.+p, 25.10.+s
Record Number:CaltechAUTHORS:20131011-151242987
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41908
Deposited By: Tony Diaz
Deposited On:14 Oct 2013 18:37
Last Modified:10 Nov 2021 04:35

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