Polarization Measurements in High-Energy Deuteron Photodisintegration

Wijesooriya, K.; Afanasev, A.; Amarian, M.; Aniol, K.; Becher, S.; Benslama, K.; Bimbot, L.; Bosted, P.; Brash, E.; Calarco, J.; Chai, Z.; Chang, C. C.; Chang, T.; Chen, J. P.; Choi, S.; Chudakov, E.; Churchwell, S.; Crovelli, D.; Dieterich, S.; Dumalski, S.; Dutta, D.; Epstein, M.; Fissum, K.; Fox, B.; Frullani, S.; Gao, H.; Gao, J.; Garibaldi, F.; Gayou, O.; Gilman, R.; Glamazdin, S.; Glashausser, C.; Gomez, J.; Gorbenko, V.; Hansen, O.; Holt, R. J.; Hovdebo, J.; Huber, G. M.; de Jager, C. W.; Jiang, X.; Jones, C.; Jones, M. K.; Kelly, J.; Kinney, E.; Kooijman, E.; Kumbartzki, G.; Kuss, M.; LeRose, J.; Liang, M.; Lindgren, R.; Liyanage, N.; Malov, S.; Margaziotis, D. J.; Markowitz, P.; McCormick, K.; Meekins, D.; Meziani, Z. -E.; Michaels, R.; Mitchell, J.; Morand, L.; Perdrisat, C. F.; Pomatsalyuk, R.; Punjabi, V.; Ransome, R. D.; Roche, R.; Rvachev, M.; Saha, A.; Sarty, A.; Schulte, E. C.; Simon, D.; Strauch, S.; Suleiman, R.; Todor, L.; Ulmer, P. E.; Urciuoli, G. M.; Wojtsekhowski, B.; Xiong, F.; Xu, W.

doi:10.1103/PhysRevLett.86.2975

Polarization Measurements in High-Energy Deuteron Photodisintegration

Journal Article · Sun Apr 01 04:00:00 EDT 2001 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.86.2975· OSTI ID:833904

Wijesooriya, K.; Afanasev, A.; Amarian, M.; Aniol, K.; Becher, S.; Benslama, K.; Bimbot, L.; Bosted, P.; Brash, E.; Calarco, J.; Chai, Z.; Chang, C. C.; Chang, T.; Chen, J. P.; Choi, S.; Chudakov, E.; Churchwell, S.; Crovelli, D.; Dieterich, S.; Dumalski, S. more »

We present measurements of the recoil proton polarization for the d(polarized y, polarized p)n reaction at thetac.m. = 90 degrees 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 py vanishes above 1 GeV, contrary to meson-baryon model expectations, in which resonances lead to large polarizations. However, the polarization transfer Cx does not vanish above 1 GeV, inconsistent with hadron helicity conservation. Thus, we show that the scaling behavior observed in the d(y,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.

Research Organization:: Thomas Jefferson National Accelerator Facility, Newport News, VA (US)

Sponsoring Organization:: USDOE Office of Energy Research (ER) (US)

DOE Contract Number:: AC05-84ER40150

OSTI ID:: 833904

Report Number(s):: JLAB-PHY-01-77; DOE/ER/40150-2932

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 14 Vol. 86; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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