Polarization measurements in neutral pion photoproduction

Wijesooriya, K.; Afanasev, A.; Amarian, M.; Aniol, K.; Becher, S.; Benslama, K.; Bimbot, L.; Bosted, P.; Brash, E. J.; 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, A.; 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/PhysRevC.66.034614

Polarization measurements in neutral pion photoproduction

Journal Article · Sun Sep 01 04:00:00 EDT 2002 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.66.034614· OSTI ID:804425

Wijesooriya, K.; Afanasev, A.; Amarian, M.; Aniol, K.; Becher, S.; Benslama, K.; Bimbot, L.; Bosted, P.; Brash, E. J.; 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 {sup 1}H(gamma-vector,p-vector)pi{sup 0} reaction for theta{sub c.m.}{sup pi} = 60{sup o}-135{sup o} and for photon energies up to 4.1 GeV. These are the first data in this reaction for polarization transfer with circularly polarized photons. Various theoretical models are compared with the results. No evidence for hadron helicity conservation is observed. Models that employ factorization are not favored. It appears from the strong angular dependence of the induced polarization at photon energies of 2.5 and 3.1 GeV that a relatively high spin resonance or background amplitude might exist in this energy region.

Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

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

DOE Contract Number:: AC05-84ER40150

OSTI ID:: 804425

Report Number(s):: JLAB-PHY-02-49; DOE/ER/40150-2360

Journal Information:: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 66; ISSN 0556-2813; ISSN PRVCAN

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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