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Title: Data analysis techniques, differential cross sections, and spin density matrix elements for the reaction γp → Φp

High-statistics measurements of differential cross sections and spin density matrix elements for the reaction γ p → Φp have been made using the CLAS detector at Jefferson Lab. We cover center-of-mass energies (√s) from 1.97 to 2.84 GeV, with an extensive coverage in the Φ production angle. The high statistics of the data sample made it necessary to carefully account for the interplay between the Φ natural lineshape and effects of the detector resolution, that are found to be comparable in magnitude. We study both the charged- (Φ → K⁺K⁻) and neutral- (Φ → K0SK0L) $$K\bar{K}$$ decay modes of the Φ. Further, for the charged mode, we differentiate between the cases where the final K⁻ track is directly detected or its momentum reconstructed as the total missing momentum in the event. The two charged-mode topologies and the neutral-mode have different resolutions and are calibrated against each other. Extensive usage is made of kinematic fitting to improve the reconstructed Φ mass resolution. Our final results are reported in 10- and mostly 30-MeV-wide √s bins for the charged- and the neutral-mode, respectively. Possible effects from K⁺Λ* channels with p$$K\bar{K}$$ final-states are discussed. These present results constitute the most precise and extensive Φ photoproduction measurements to date and in conjunction with the ω photoproduction results recently published by CLAS, will greatly improve our understanding of low energy vector meson photoproduction.
Authors:
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  1. Carnegie Mellon Univ., Pittsburgh, PA (United States)
  2. Old Dominion Univ., Norfolk, VA (United States)
  3. National Inst. of Nuclear Physics (INFN), Frascati (Italy). National Lab. of Frascati (INFN-LFN)
  4. Univ. of Glasgow, Scotland (United Kingdom)
  5. Commissariat a l'Energie Atomique et aux Energies Alternatives (CEA), Saclay (France). Inst. de Physique Nuclaeaire
  6. Argonne National Lab. (ANL), Argonne, IL (United States)
  7. Istituto Nazionale di Fisica Nucleare (INFN), Genova (Italy)
  8. Inst. of Theoretical and Experimental Physics (ITEP), Moscow (Russian Federation)
  9. Fairfield Univ., CT (United States)
  10. Florida International Univ., Miami, FL (United States)
  11. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  12. George Washington Univ., Washington, DC (United States)
  13. Univ. Tecnica Federico Santa Maria, Valparaiso (Chile); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  14. Ohio Univ., Athens, OH (United States)
  15. National Inst. of Nuclear Physics (INFN), Rome (Italy)
  16. Idaho State Univ., Pocatello, ID (United States)
  17. National Inst. of Nuclear Physics (INFN), Ferrara (Italy)
  18. Florida State Univ., Tallahassee, FL (United States)
  19. National Inst. of Nuclear Physics (INFN), Rome (Italy); Univ. di Roma, Rome (Italy)
  20. Yerevan Physics Inst. (YerPhI) (Armenia)
  21. Univ. of South Carolina, Columbia, SC (United States)
  22. Christopher Newport Univ., Newport News, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  23. Arizona State Univ., Tempe, AZ (United States)
  24. Univ. of Edinburgh, Scotland (United Kingdom)
  25. Univ. of Richmond, VA (United States)
  26. James Madison Univ., Harrisonburg, VA (Untied States)
  27. College of William and Mary, Williamsburg, VA (United States)
  28. Inst. de Physique Nucleaire (IPN), Orsay (France)
  29. Univ. of Connecticut, Storrs, CT (United States)
  30. Univ. of New Hampshire, Durham, NH (United States)
  31. Univ. of South Carolina, Columbia, SC (United States); George Washington Univ., Washington, DC (United States)
  32. Skobeltsyn Nuclear Physics Inst., Moscow (Russian Federation)
  33. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
  34. Univ. of Connecticut, Storrs, CT (United States); Univ. Tecnica Federico Santa Maria, Valparaiso (Chile)
  35. Norfolk State Univ., VA (United States)
  36. Kyungpook National Univ., Daegu (Korea, Republic of)
  37. Catholic Univ. of America, Washington, DC (United States)
  38. Rensselaer Polytechnic Inst., Troy, NY (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Univ. Tecnica Federico Santa Maria, Valparaiso (Chile);
  39. Carnegie Mellon Univ., Pittsburgh, PA (United States); Washington and Jefferson College, Washington, PA (United States)
  40. Skobeltsyn Nuclear Physics Inst., Moscow (Russian Federation); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  41. National Inst. of Nuclear Physics (INFN), Genova (Italy)
  42. Univ. of South Carolina, Columbia, SC (United States); Kyungpook National Univ., Daegu (Korea, Republic of)
  43. Arizona State Univ., Tempe, AZ (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  44. Univ. of Virginia, Charlottesville, VA (United States)
  45. California State Univ., Carson, CA (United States)
  46. National Inst. of Nuclear Physics (INFN), Frascati (Italy). National Lab. of Frascati (INFN-LFN); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  47. Rensselaer Polytechnic Inst., Troy, NY (United States)
  48. Univ. of Genova (Italy)
  49. Univ. of Connecticut, Storrs, CT (United States); Rensselaer Polytechnic Inst., Troy, NY (United States)
  50. Univ. Joseph Fornier, CNRS/IN2P3, Grenoble (France)
Publication Date:
OSTI Identifier:
1132595
Grant/Contract Number:
FG02-87ER40315; AC05-84ER40150
Type:
Accepted Manuscript
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 89; Journal Issue: 5; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society (APS)
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
CLAS Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS