Nucleon transition form factors at JLab: status and outlook

  • The measurements of exclusive single-meson and double-pion electro-production cross sections off the proton to study nucleon resonances will be extended to higher momentum transfers with the CLAS12 detector and the energy upgraded CEBAF beam. Based on new theoretical developments to extract and interpret the electromagnetic transition form factors and on the experience gained from the most recent results, the newly formed collaboration of experimentalists and theorists shall enable us to provide unprecedented high-precision data, high-quality analyses, and state-of-the-art model and QCD based calculations in a Q2 domain up to 10 GeV2. For the first time nucleon resonance structures will be studied at still unexplored distance scales, where the dressed quark contributions are the dominating degrees of freedom and their strong interaction is responsible for the ground and excited nucleon state formation. These studies also open up a promising opportunity to understand the origin of more than 98% of the nucleon mass that is created by strong fields predominantly at these distance scales by dressing the current quarks.

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  • [1] . Gothe R W, Mokeev V et al. Nucleon ResonanceStudies with CLAS12, Approved Proposal E-09-003,www.physics.sc.edu/gothe/research/pub/nstar12-12-08.pdf (2009)2. Aznauryan I et al. Theory Support for the Excited BaryonProgram at the JLab 12 GeV Upgrade, arXiv:0907.1901v2[nucl-th] (2009)3. Roberts C D et al. these proceedings, Phys. Rev. C, 2003,67: 015203; Prog. Part. Nucl. Phys., 1994, 33: 4774. LIN H W et al. these proceedings, arXiv:0810.5141 [hep-lat]; Phys. Rev. D, 2009, 79: 1145055. Braun V M et al. Phys. Rev. D, 2006, 74: 074501; Phys.Rev. D, 2006, 73: 094019; Phys. Rev. D, 2002, 65: 0740116. Ichie H, Bornyakov V, Steuer T, Schierholz G. hep-lat/0212024 (2002)7. Ungaro M et al. Phys. Rev. Lett., 2006, 97: 1120038. Aznauryan I G. Phys. Rev. C, 2003, 67: 0152099. Joo K et al. Phys. Rev. Lett., 2002, 88: 12200110. Gothe R W. Proceedings of NSTAR 2002, World Scienti c,200311. Frolov V V et al. Phys. Rev. Lett., 1999, 82: 4512. Mertz C et al. Phys. Rev. Lett., 2001, 86: 296313. Beck R et al. Phys. Rev. C, 2000, 61: 03520414. Laveissiere G et al. Phys. Rev. C, 2004, 69: 04520315. Joo K et al. Phys. Rev. C, 2004, 70: 04220116. Kelly J J et al. Phys. Rev. Lett., 2005, 95: 10200117. Egiyan H et al. Phys. Rev. C, 2006, 73: 02520418. Arndt R A et al. nucl-th/9708006 (1997); Phys. Rev. C,2002, 66: 05521319. Barker I S, Donnachie A, Storrow J K. Nucl. Phys. B, 1975,9520. Bowman P O et al. Phys. Lett. D, 2002, 66: 014505;arXiv:hep-lat/0209129 (2002)21. Bhagwat M S et al. arXiv:nucl-th/0304003 (2003)22. Iida H et al. Nucl. Phys. Proc., 2005, Suppl. 14123. Diakonov D, Petrov V. Phys. Lett. B, 1984, 147: 35124. Preliminary JLab Results. Park K, Aznauryan I. Private Communication, 200825. Tiator L et al. These proceedings, Eur. Phys. J. A, 2007,34: 387; Nucl. Phys. A, 1999, 645: 14526. Preliminary JLab Results, Mokeev V, Private Communica-tion, 200927. Ablikim M et al. Phys. Rev. Lett., 2009, 97: 06200128. Aznauryan I et al. arXiv:nucl-ex/0804.0447 (2008)29. Park K et al. Phys. Rev. C, 2008, 77: 01520830. Aznauryan I G et al. Phys. Rev. C, 2005, 71: 01520131. Joo K et al. Phys. Rev. Lett., 2002, 88: 122001; Joo K etal. Phys. Rev. C, 2003, 68: 032201; Joo K et al. Phys. Rev.C, 2003, 70: 042201; Egiyan H et al. Phys. Rev. C, 2006,73: 02520432. Aznauryan I G et al. Phys. Rev. C, 2005, 72: 04520133. Eidelman S et al. Phys. Lett. B, 2004, 592: 134. Capstick S, Keister B D. Phys. Rev. D, 1995, 51: 359835. Weber H J. Phys. Rev. C, 1990, 41: 278336. Cardelli F et al. Phys. Lett. B, 1997, 397: 1337. Julia-Diaz B. Phys. Rev. C, 2004, 69: 03521238. Aznauryan I G et al. Phys. Rev. C, 2007, 76: 02521239. Cano F, Gonzalez P. Phys. Lett. B, 1998, 43140. LI Z, Burkert V. Phys. Rev. D, 1992, 46: 7041. Mastsuyama A et al. Physics Reports, 2007, 43942. Lee T-S H et al. Theory Support for the Excited Baryon Program at the JLab 12 GeV Upgrade, arXiv:0907.1901v2[nucl-th] (2009); Julia-Diaz B et al. these proceedings43. Ripani M et al. Phys. Rev. Lett., 2003, 91: 02200244. Bellis M et al. Proceedings of NSTAR2004, World Scien-ti c, 200445. Battaglieri M et al. Phys. Rev. Lett., 2001, 87: 17200246. Strauch S et al. Phys. Rev. Lett., 2005, 95: 16200347. Fedotov G et al. CLAS Analysis Note, June 200648. Thoma U. Int. J. Mod. Phys. A, 2005, 20: 28049. WU C et al. Eur. Phys. J A, 2005, 23:31750. Assa ri Y et al. Phys. Rev. Lett., 2003, 90: 22200151. Ahrens J et al. Phys. Lett. B, 2005, 624: 17352. Kotulla M et al. Phys. Lett. B, 2004, 578: 6353. Langgartner W et al. Phys. Rev. Lett., 2001, 87: 05200154. Harter F et al. Phys. Lett. B, 1997, 401: 22955. Braghieri A et al. Phys. Lett. B, 1995, 36356. Burkert V, Lee T-S H. Int. J. Mod. Phys. E, 2004, 13; andnucl-ex/040702057. Capstick S, Roberts W. Prog. Part. Nucl. Phys., 2000, 45:s24158. Mokeev V et al. Proceedings of NSTAR2007, Springer,2008, or arXiv:0710.5616v2 [hep-ex] (2007)59. Mokeev V et al. arXiv:hep-ph/0512164; Phys. of Atom.Nucl., 2003, 66; Phys. of Atom. Nucl., 2001, 6460. Preliminary JLab Results, Mokeev V. Private Communication, 200861. Aznauryan I G. Phys. Rev. C, 2003, 68: 065204; Phys.Rev. C, 2003, 67: 015209
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R. W. Gothe. Nucleon transition form factors at JLab: status and outlook[J]. Chinese Physics C, 2009, 33(12): 1216-1221. doi: 10.1088/1674-1137/33/12/026
R. W. Gothe. Nucleon transition form factors at JLab: status and outlook[J]. Chinese Physics C, 2009, 33(12): 1216-1221.  doi: 10.1088/1674-1137/33/12/026 shu
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Received: 2009-08-07
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Nucleon transition form factors at JLab: status and outlook

    Corresponding author: R. W. Gothe,
  • (University of South Carolina, Columbia, SC 29208, USA)

Abstract: 

The measurements of exclusive single-meson and double-pion electro-production cross sections off the proton to study nucleon resonances will be extended to higher momentum transfers with the CLAS12 detector and the energy upgraded CEBAF beam. Based on new theoretical developments to extract and interpret the electromagnetic transition form factors and on the experience gained from the most recent results, the newly formed collaboration of experimentalists and theorists shall enable us to provide unprecedented high-precision data, high-quality analyses, and state-of-the-art model and QCD based calculations in a Q2 domain up to 10 GeV2. For the first time nucleon resonance structures will be studied at still unexplored distance scales, where the dressed quark contributions are the dominating degrees of freedom and their strong interaction is responsible for the ground and excited nucleon state formation. These studies also open up a promising opportunity to understand the origin of more than 98% of the nucleon mass that is created by strong fields predominantly at these distance scales by dressing the current quarks.

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