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Luo W, Brash EJ, Gilman R, et al. Polarization components in π0 photoproduction at photon energies up to 5.6 GeV. Phys Rev Lett. 2012;108(22):222004doi: 10.1103/PhysRevLett.108.222004.
Luo, W., Brash, E. J., Gilman, R., Jones, M. K., Meziane, M., Pentchev, L., Perdrisat, C. F., Puckett, A. J., Punjabi, V., Wesselmann, F. R., Ahmidouch, A., Albayrak, I., Aniol, K. A., Arrington, J., Asaturyan, A., Ates, O., Baghdasaryan, H., Benmokhtar, F., Bertozzi, W., Bimbot, L., Bosted, P., Boeglin, W., Butuceanu, C., Carter, P., Chernenko, S., Christy, M. E., Commisso, M., Cornejo, J. C., Covrig, S., Danagoulian, S., Daniel, A., Davidenko, A., Day, D., Dhamija, S., Dutta, D., Ent, R., Frullani, S., Fenker, H., Frlez, E., Garibaldi, F., Gaskell, D., Gilad, S., Goncharenko, Y., Hafidi, K., Hamilton, D., Higinbotham, D. W., Hinton, W., Horn, T., Hu, B., Huang, J., Huber, G. M., Jensen, E., Kang, H., Keppel, C., Khandaker, M., King, P., Kirillov, D., Kohl, M., Kravtsov, V., Kumbartzki, G., Li, Y., Mamyan, V., Margaziotis, D. J., Markowitz, P., Marsh, A., Matulenko, Y., Maxwell, J., Mbianda, G., Meekins, D., Melnik, Y., Miller, J., Mkrtchyan, A., Mkrtchyan, H., Moffit, B., Moreno, O., Mulholland, J., Narayan, A., Nuruzzaman, Nedev, S., Piasetzky, E., Pierce, W., Piskunov, N. M., Prok, Y., Ransome, R. D., Razin, D. S., Reimer, P. E., Reinhold, J., Rondon, O., Shabestari, M., Shahinyan, A., Shestermanov, K., Širca, S., Sitnik, I., Smykov, L., Smith, G., Solovyev, L., Solvignon, P., Strakovsky, I. I., Subedi, R., Suleiman, R., Tomasi-Gustafsson, E., Vasiliev, A., Veilleux, M., Wood, S., Ye, Z., Zanevsky, Y., Zhang, X., Zhang, Y., Zheng, X., Zhu, L. (2012). Polarization components in π0 photoproduction at photon energies up to 5.6 GeV. Physical review letters, 108(22), 222004. https://doi.org/10.1103/PhysRevLett.108.222004
Luo, W, et al. "Polarization components in π0 photoproduction at photon energies up to 5.6 GeV." Physical review letters vol. 108,22 (2012): 222004. doi: https://doi.org/10.1103/PhysRevLett.108.222004
Luo W, Brash EJ, Gilman R, Jones MK, Meziane M, Pentchev L, Perdrisat CF, Puckett AJ, Punjabi V, Wesselmann FR, Ahmidouch A, Albayrak I, Aniol KA, Arrington J, Asaturyan A, Ates O, Baghdasaryan H, Benmokhtar F, Bertozzi W, Bimbot L, Bosted P, Boeglin W, Butuceanu C, Carter P, Chernenko S, Christy ME, Commisso M, Cornejo JC, Covrig S, Danagoulian S, Daniel A, Davidenko A, Day D, Dhamija S, Dutta D, Ent R, Frullani S, Fenker H, Frlez E, Garibaldi F, Gaskell D, Gilad S, Goncharenko Y, Hafidi K, Hamilton D, Higinbotham DW, Hinton W, Horn T, Hu B, Huang J, Huber GM, Jensen E, Kang H, Keppel C, Khandaker M, King P, Kirillov D, Kohl M, Kravtsov V, Kumbartzki G, Li Y, Mamyan V, Margaziotis DJ, Markowitz P, Marsh A, Matulenko Y, Maxwell J, Mbianda G, Meekins D, Melnik Y, Miller J, Mkrtchyan A, Mkrtchyan H, Moffit B, Moreno O, Mulholland J, Narayan A, Nuruzzaman, Nedev S, Piasetzky E, Pierce W, Piskunov NM, Prok Y, Ransome RD, Razin DS, Reimer PE, Reinhold J, Rondon O, Shabestari M, Shahinyan A, Shestermanov K, Širca S, Sitnik I, Smykov L, Smith G, Solovyev L, Solvignon P, Strakovsky II, Subedi R, Suleiman R, Tomasi-Gustafsson E, Vasiliev A, Veilleux M, Wood S, Ye Z, Zanevsky Y, Zhang X, Zhang Y, Zheng X, Zhu L. Polarization components in π0 photoproduction at photon energies up to 5.6 GeV. Phys Rev Lett. 2012 Jun 01;108(22):222004. doi: 10.1103/PhysRevLett.108.222004. PMID: 23180491.
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Phys Rev Lett. 2012 Jun 01;108(22):222004. doi: 10.1103/PhysRevLett.108.222004.

Polarization components in π0 photoproduction at photon energies up to 5.6 GeV.

Physical review letters

W Luo, E J Brash, R Gilman, M K Jones, M Meziane, L Pentchev, C F Perdrisat, A J R Puckett, V Punjabi, F R Wesselmann, A Ahmidouch, I Albayrak, K A Aniol, J Arrington, A Asaturyan, O Ates, H Baghdasaryan, F Benmokhtar, W Bertozzi, L Bimbot, P Bosted, W Boeglin, C Butuceanu, P Carter, S Chernenko, M E Christy, M Commisso, J C Cornejo, S Covrig, S Danagoulian, A Daniel, A Davidenko, D Day, S Dhamija, D Dutta, R Ent, S Frullani, H Fenker, E Frlez, F Garibaldi, D Gaskell, S Gilad, Y Goncharenko, K Hafidi, D Hamilton, D W Higinbotham, W Hinton, T Horn, B Hu, J Huang, G M Huber, E Jensen, H Kang, C Keppel, M Khandaker, P King, D Kirillov, M Kohl, V Kravtsov, G Kumbartzki, Y Li, V Mamyan, D J Margaziotis, P Markowitz, A Marsh, Y Matulenko, J Maxwell, G Mbianda, D Meekins, Y Melnik, J Miller, A Mkrtchyan, H Mkrtchyan, B Moffit, O Moreno, J Mulholland, A Narayan, Nuruzzaman, S Nedev, E Piasetzky, W Pierce, N M Piskunov, Y Prok, R D Ransome, D S Razin, P E Reimer, J Reinhold, O Rondon, M Shabestari, A Shahinyan, K Shestermanov, S Širca, I Sitnik, L Smykov, G Smith, L Solovyev, P Solvignon, I I Strakovsky, R Subedi, R Suleiman, E Tomasi-Gustafsson, A Vasiliev, M Veilleux, S Wood, Z Ye, Y Zanevsky, X Zhang, Y Zhang, X Zheng, L Zhu,

Affiliations

  1. Lanzhou University, Lanzhou 730000, Gansu, People's Republic of China.

PMID: 23180491 DOI: 10.1103/PhysRevLett.108.222004

Abstract

We present new data for the polarization observables of the final state proton in the (1)H(γ,p)π(0) reaction. These data can be used to test predictions based on hadron helicity conservation and perturbative QCD. These data have both small statistical and systematic uncertainties and were obtained with beam energies between 1.8 and 5.6 GeV and for π(0) scattering angles larger than 75° in the center-of-mass frame. The data extend the polarization measurements database for neutral pion photoproduction up to E(γ)=5.6 GeV. The results show a nonzero induced polarization above the resonance region. The polarization transfer components vary rapidly with the photon energy and π(0) scattering angle in the center-of-mass frame. This indicates that hadron helicity conservation does not hold and that the perturbative QCD limit is still not reached in the energy regime of this experiment.

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