Polarization Measurements in High-energy Deuteron Photodisintegration
- K. Wijesooriya
- A. Afanasev
- M. Amarian
- K. A. Aniol
- S. Becher
- K. Benslama
- L. Bimbot
- P. Bosted
- E. J. Brash
- J. Calarco
- Z. Chai
- C. C. Chang
- T. Chang
- J. P. Chen
- S. Choi
- E. Chudakov
- S. Churchwell
- D. Crovelli
- S. Dieterich
- S. Dumalski
- D. Dutta
- M. B. Epstein
- K. Fissum
- B. Fox
- S. Frullani
- H. Gao
- J. Gao
- F. Garibaldi
- O. Gayou
- R. Gilman
- S. Glamazdin
- C. Glashausser
- Sergio Leonardo Gomez
- V. Gorbenko
- O. Hansen
- R. J. Holt
- J. Hovdebo
- G. M. Huber
- C. W. de Jager
- X. Jiang
- C. Jones
- M. K. Jones
- J. Kelly
- E. Kinney
- Edgar E Kooijman
- G. Kumbartzki
- M. Kuss
- J. LeRose
- M. Liang
- R. Lindgren
- N. Liyanage
- S. Malov
- D. J. Margaziotis
- P. Markowitz
- K. McCormick
- D. Meekins
- Z. E. Meziani
- R. Michaels
- J. Mitchell
- L. Morand
- C. F. Perdrisat
- R. Pomatsalyuk
- V. Punjabi
- R. D. Ransome
- R. Roche
- M. Rvachev
- A. Saha
- A. Sarty
- E. C. Schulte
- G. Simon
- S. Strauch
- R. Suleiman
- L. Todor
- P. E. Ulmer
- G. M. Urciuoli
- B. Wojtsekhowski
- F. Xiong
- W. Xu
Publication date
January 2001
DOI Publisher
American Physical Society (APS)Abstract
We present measurements of the recoil proton polarization for thed(γ→,p→)nreaction atθc.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 polarizationpyvanishes above 1 GeV, contrary to meson-baryon model expectations, in which resonances lead to large polarizations. However, the polarization transferCxdoes not vanish above 1 GeV, inconsistent with hadron helicity conservation. Thus, we show that the scaling behavior observed in thed(γ,p)ncross sections is not a result of perturbative QCD. These data should provide important tests of new nonperturbative calculations in the intermediate energy regime.</p
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