Polarization Components in π0 Photoproduction at Photon Energies up to 5.6 GeV
We present new data for the polarization observables of the final state proton in the 1H(γ⃗,p⃗)π[superscript 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 wer...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2012
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| Online Access: | http://hdl.handle.net/1721.1/72490 https://orcid.org/0000-0003-2713-7800 https://orcid.org/0000-0002-6261-6172 |
| _version_ | 1826197565834526720 |
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| author | Bertozzi, William Gilad, Shalev Huang, Jin |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Bertozzi, William Gilad, Shalev Huang, Jin |
| author_sort | Bertozzi, William |
| collection | MIT |
| description | We present new data for the polarization observables of the final state proton in the 1H(γ⃗,p⃗)π[superscript 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[superscript 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 Eγ=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[superscript 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. |
| first_indexed | 2024-09-23T10:49:56Z |
| format | Article |
| id | mit-1721.1/72490 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:49:56Z |
| publishDate | 2012 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/724902022-09-27T15:17:42Z Polarization Components in π0 Photoproduction at Photon Energies up to 5.6 GeV Bertozzi, William Gilad, Shalev Huang, Jin Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Bertozzi, William Bertozzi, William Gilad, Shalev Huang, Jin We present new data for the polarization observables of the final state proton in the 1H(γ⃗,p⃗)π[superscript 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[superscript 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 Eγ=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[superscript 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. United States. Dept. of Energy (contract no. DE-AC05-06OR23177) National Science Foundation (U.S.). 2012-08-31T14:52:27Z 2012-08-31T14:52:27Z 2012-05 2011-09 Article http://purl.org/eprint/type/JournalArticle 0031-9007 http://hdl.handle.net/1721.1/72490 Luo, W. et al. “Polarization Components in π[superscript 0] Photoproduction at Photon Energies up to 5.6 GeV.” Physical Review Letters 108.22 (2012): 222004. © 2012 American Physical Society. https://orcid.org/0000-0003-2713-7800 https://orcid.org/0000-0002-6261-6172 en_US http://dx.doi.org/10.1103/PhysRevLett.108.222004 Physical Review Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Bertozzi, William Gilad, Shalev Huang, Jin Polarization Components in π0 Photoproduction at Photon Energies up to 5.6 GeV |
| title | Polarization Components in π0 Photoproduction at Photon Energies up to 5.6 GeV |
| title_full | Polarization Components in π0 Photoproduction at Photon Energies up to 5.6 GeV |
| title_fullStr | Polarization Components in π0 Photoproduction at Photon Energies up to 5.6 GeV |
| title_full_unstemmed | Polarization Components in π0 Photoproduction at Photon Energies up to 5.6 GeV |
| title_short | Polarization Components in π0 Photoproduction at Photon Energies up to 5.6 GeV |
| title_sort | polarization components in π0 photoproduction at photon energies up to 5 6 gev |
| url | http://hdl.handle.net/1721.1/72490 https://orcid.org/0000-0003-2713-7800 https://orcid.org/0000-0002-6261-6172 |
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