Beam spin asymmetries in deeply virtual Compton scattering (DVCS) with CLAS at 4.8 GeV
We report measurements of the beam spin asymmetry in deeply virtual Compton scattering (DVCS) at an electron beam energy of 4.8 GeV using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The DVCS beam spin asymmetry has been measured in a wide range of kinematics, 1.0<Q2&l...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2011
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| Online Access: | http://hdl.handle.net/1721.1/65093 |
| _version_ | 1826207658330292224 |
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| author | Prok, Yelena Rowntree, D. Skabelin, Alexander V. Suleiman, R. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Prok, Yelena Rowntree, D. Skabelin, Alexander V. Suleiman, R. |
| author_sort | Prok, Yelena |
| collection | MIT |
| description | We report measurements of the beam spin asymmetry in deeply virtual Compton scattering (DVCS) at an electron beam energy of 4.8 GeV using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The DVCS beam spin asymmetry has been measured in a wide range of kinematics, 1.0<Q2<2.8 (GeV/c)2 [1.0 < Q superscript 2 < 2.8 (GeV/c) superscript 2], 0.12<xB<0.48 [0.12 < X subscript beta < 0.48], and 0.1<-t<0.8 (GeV/c)2 [0.1 < -t < 0.8 (GeV/c) superscript 2], using the reaction e⃗p→e'pX [e superscript right arrow e prime pX]. The number of H(e,e'γp) [H (e,e prime yp)] and H(e,e'π0p) [H(e,e prime pi superscript 0 p] events are separated in each (Q2,xB,t) [(Q superscript 2, x subscript beta, t)] bin by a fit to the line shape of the H(e,e'p)X Mx2 [H (e, e prime p) X M subscript x superscript 2] distribution. The validity of the method was studied in detail using experimental and simulated data. It was shown that with the achieved missing mass squared resolution and the available statistics, the separation of DVCS–Bethe-Heitler and π0 [pi superscript 0] events can reliably be done with less than 5% uncertainty. Also, the Q2 [Q superscript 2] and t dependences of the sinϕ [sin phi] moments of the asymmetry are extracted and compared with theoretical calculations. |
| first_indexed | 2024-09-23T13:52:56Z |
| format | Article |
| id | mit-1721.1/65093 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:52:56Z |
| publishDate | 2011 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/650932022-09-28T16:48:17Z Beam spin asymmetries in deeply virtual Compton scattering (DVCS) with CLAS at 4.8 GeV Prok, Yelena Rowntree, D. Skabelin, Alexander V. Suleiman, R. Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Rowntree, D. Prok, Yelena Rowntree, D. Skabelin, Alexander V. Suleiman, R. We report measurements of the beam spin asymmetry in deeply virtual Compton scattering (DVCS) at an electron beam energy of 4.8 GeV using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The DVCS beam spin asymmetry has been measured in a wide range of kinematics, 1.0<Q2<2.8 (GeV/c)2 [1.0 < Q superscript 2 < 2.8 (GeV/c) superscript 2], 0.12<xB<0.48 [0.12 < X subscript beta < 0.48], and 0.1<-t<0.8 (GeV/c)2 [0.1 < -t < 0.8 (GeV/c) superscript 2], using the reaction e⃗p→e'pX [e superscript right arrow e prime pX]. The number of H(e,e'γp) [H (e,e prime yp)] and H(e,e'π0p) [H(e,e prime pi superscript 0 p] events are separated in each (Q2,xB,t) [(Q superscript 2, x subscript beta, t)] bin by a fit to the line shape of the H(e,e'p)X Mx2 [H (e, e prime p) X M subscript x superscript 2] distribution. The validity of the method was studied in detail using experimental and simulated data. It was shown that with the achieved missing mass squared resolution and the available statistics, the separation of DVCS–Bethe-Heitler and π0 [pi superscript 0] events can reliably be done with less than 5% uncertainty. Also, the Q2 [Q superscript 2] and t dependences of the sinϕ [sin phi] moments of the asymmetry are extracted and compared with theoretical calculations. United States. Dept. of Energy (Contract No. DE-AC05-84150) National Science Foundation (U.S.) 2011-08-05T17:32:55Z 2011-08-05T17:32:55Z 2009-09 2009-01 Article http://purl.org/eprint/type/JournalArticle 0556-2813 http://hdl.handle.net/1721.1/65093 Gavalian, G. et al. “Beam Spin Asymmetries in Deeply Virtual Compton Scattering (DVCS) with CLAS at 4.8 GeV.” Physical Review C 80.3 (2009) : n. pag. © 2009 The American Physical Society en_US http://dx.doi.org/10.1103/PhysRevC.80.035206 Physical review C 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 | Prok, Yelena Rowntree, D. Skabelin, Alexander V. Suleiman, R. Beam spin asymmetries in deeply virtual Compton scattering (DVCS) with CLAS at 4.8 GeV |
| title | Beam spin asymmetries in deeply virtual Compton scattering (DVCS) with CLAS at 4.8 GeV |
| title_full | Beam spin asymmetries in deeply virtual Compton scattering (DVCS) with CLAS at 4.8 GeV |
| title_fullStr | Beam spin asymmetries in deeply virtual Compton scattering (DVCS) with CLAS at 4.8 GeV |
| title_full_unstemmed | Beam spin asymmetries in deeply virtual Compton scattering (DVCS) with CLAS at 4.8 GeV |
| title_short | Beam spin asymmetries in deeply virtual Compton scattering (DVCS) with CLAS at 4.8 GeV |
| title_sort | beam spin asymmetries in deeply virtual compton scattering dvcs with clas at 4 8 gev |
| url | http://hdl.handle.net/1721.1/65093 |
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