Advertisement

Exclusive electroproduction of K+Λ and K+Σ0 final states at Q2 = 0.030–0.055 (GeV/c)2

  • A1 Collaboration
  • P. Achenbach
  • C. Ayerbe Gayoso
  • J. C. Bernauer
  • S. Bianchin
  • R. Böhm
  • O. Borodina
  • D. Bosnar
  • M. Bösz
  • V. Bozkurt
  • P. Bydžovský
  • L. Debenjak
  • M. O. Distler
  • A. Esser
  • I. Friščić
  • M. Gómez Rodríguez
  • B. Göküzüm
  • K. Grießinger
  • P. Jennewein
  • E. Kim
  • M. Makek
  • H. Merkel
  • S. Minami
  • U. Müller
  • D. Nakajima
  • L. Nungesser
  • B. Özel-Tashenov
  • J. Pochodzalla
  • Ch. Rappold
  • T. R. Saito
  • S. Sánchez Majos
  • B. S. Schlimme
  • S. Širca
  • M. Weinriefer
  • C. J. Yoon
Open Access
Regular Article - Experimental Physics

Abstract

Cross-section measurements of the exclusive p(e, e′K +)Λ, Σ 0electroproduction reactions have been performed at the Mainz Microtron MAMI in the A1 spectrometer facility using for the first time the KAOS spectrometer for kaon detection. These processes were studied in a kinematical region not covered by any previous experiment. The nucleon was probed in its third-resonance region with virtual photons of low four-momenta, Q 2 = 0.030–0.055 (GeV/c)2. The MAMI data indicate a smooth transition in Q2 from photoproduction to electroproduction cross-sections. Comparison with predictions of effective Lagrangian models based on the isobar approach reveal that strong longitudinal couplings of the virtual photon to the N* resonances can be excluded from these models. Modern isobar and Regge-plus-resonance models are in agreement with the data.

Keywords

Virtual Photon Nucleon Resonance Coincidence Time Photoproduction Data Longitudinal Coupling 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    K.H. Kaiser et al., Nucl. Instrum. Methods Phys. Res. A 593, 159 (2008).ADSCrossRefGoogle Scholar
  2. 2.
    R.A. Adelseck, B. Saghai, Phys. Rev. C 42, 108 (1990).ADSCrossRefGoogle Scholar
  3. 3.
    R.A. Williams, C.R. Ji, S.R. Cotanch, Phys. Rev. C 46, 1617 (1992).ADSCrossRefGoogle Scholar
  4. 4.
    J.C. David, C. Fayard, G.H. Lamot, B. Saghai, Phys. Rev. C 53, 2613 (1996).ADSCrossRefGoogle Scholar
  5. 5.
    T. Mizutani, C. Fayard, G.H. Lamot, B. Saghai, Phys. Rev. C 58, 75 (1998).ADSCrossRefGoogle Scholar
  6. 6.
    T. Mart, C. Bennhold, Phys. Rev. C 61, 012201 (2000).ADSCrossRefGoogle Scholar
  7. 7.
    S. Janssen, J. Ryckebusch, D. Debruyne, T. Van Cauteren, Phys. Rev. C 65, 015201 (2002).ADSCrossRefGoogle Scholar
  8. 8.
    R. Shyam, O. Scholten, H. Lenske, Phys. Rev. C 81, 015204 (2010).ADSCrossRefGoogle Scholar
  9. 9.
    B. Juliá-Diaz, B. Saghai, T.S.H. Lee, F. Tabakin, Phys. Rev. C 73, 055204 (2006).ADSCrossRefGoogle Scholar
  10. 10.
    T. Corthals, D.G. Ireland, T. Van Cauteren, J. Ryckebusch, Phys. Rev. C 75, 045204 (2007).ADSCrossRefGoogle Scholar
  11. 11.
    L. De Cruz, T. Vrancx, P. Vancraeyveld, J. Ryckebusch, Bayesian inference of the resonance content of p(γ, K +), arXiv:1111.6511 [nucl-th] (2011).
  12. 12.
    E93-018 Collaboration (R.M. Mohring et al.), Phys. Rev. C 67, 055205 (2003).ADSCrossRefGoogle Scholar
  13. 13.
    CLAS Collaboration (R. Bradford et al.), Phys. Rev. C 73, 035202 (2006).ADSCrossRefGoogle Scholar
  14. 14.
    CLAS Collaboration (P. Ambrozewicz et al.), Phys. Rev. C 75, 045203 (2007).ADSCrossRefGoogle Scholar
  15. 15.
    Hall A Collaboration (M. Coman et al.), Phys. Rev. C 81, 052201 (2010).ADSCrossRefGoogle Scholar
  16. 16.
    CLAS Collaboration (M.E. McCracken et al.), Phys. Rev. C 81, 025201 (2010).ADSCrossRefGoogle Scholar
  17. 17.
    A1 Collaboration (K.I. Blomqvist et al.), Nucl. Instrum. Methods Phys. Res. A 403, 263 (1998).ADSCrossRefGoogle Scholar
  18. 18.
    A1 Collaboration (P. Achenbach et al.), Eur. Phys. J. ST 198, 307 (2011).CrossRefGoogle Scholar
  19. 19.
    A1 Collaboration (P. Achenbach et al.), Nucl. Instrum. Methods Phys. Res. A 641, 105 (2011).ADSCrossRefGoogle Scholar
  20. 20.
    L.W. Mo, Y.S. Tsai, Rev. Mod. Phys. 41, 205 (1969).CrossRefADSGoogle Scholar
  21. 21.
    SAPHIR Collaboration (K.H. Glander et al.), Eur. Phys. J. A 19, 251 (2004).ADSCrossRefGoogle Scholar
  22. 22.
    T. Mart, C. Bennhold, H. Haberzettl, L. Tiator, An effective Lagrangian model for kaon photo- and electroproduction on the nucleon, available online at www.kph.uni-mainz.de/MAID/kaon/kaonmaid.html.
  23. 23.
    E93-018 Collaboration (G. Niculescu et al.), Phys. Rev. Lett. 81, 1805 (1998).ADSCrossRefGoogle Scholar
  24. 24.
    P. Bydžovský, F. Cusanno, S. Frullani, F. Garibaldi, M. Iodice, M. Sotona, G.M. Urciuoli, Models for photo- and electro-production of K+ in view of new data, arXiv:nucl-th/0305039 (2003).
  25. 25.
    T. Mart, L. Tiator, private communication (2011).Google Scholar
  26. 26.
    CLAS Collaboration (R. Bradford et al.), Phys. Rev. C 75, 035205 (2007).ADSCrossRefGoogle Scholar
  27. 27.
    CLAS Collaboration (R. Nasseripour et al.), Phys. Rev. C 77, 065208 (2008).ADSCrossRefGoogle Scholar
  28. 28.
    CLAS Collaboration (D.S. Carman et al.), Phys. Rev. C 79, 065205 (2009).ADSCrossRefGoogle Scholar
  29. 29.
    Hall A Collaboration (M. Iodice et al.), Phys. Rev. Lett. 99, 052501 (2007).ADSCrossRefGoogle Scholar
  30. 30.
    Hall A Collaboration (F. Cusanno et al.), Phys. Rev. Lett. 103, 202501 (2009).ADSCrossRefGoogle Scholar

Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • A1 Collaboration
  • P. Achenbach
    • 1
  • C. Ayerbe Gayoso
    • 1
  • J. C. Bernauer
    • 1
  • S. Bianchin
    • 2
  • R. Böhm
    • 1
  • O. Borodina
    • 2
  • D. Bosnar
    • 3
  • M. Bösz
    • 1
  • V. Bozkurt
    • 2
  • P. Bydžovský
    • 4
  • L. Debenjak
    • 5
  • M. O. Distler
    • 1
  • A. Esser
    • 1
  • I. Friščić
    • 3
  • M. Gómez Rodríguez
    • 1
  • B. Göküzüm
    • 2
  • K. Grießinger
    • 1
  • P. Jennewein
    • 1
  • E. Kim
    • 2
  • M. Makek
    • 3
  • H. Merkel
    • 1
  • S. Minami
    • 2
  • U. Müller
    • 1
  • D. Nakajima
    • 2
  • L. Nungesser
    • 1
  • B. Özel-Tashenov
    • 2
  • J. Pochodzalla
    • 1
  • Ch. Rappold
    • 2
  • T. R. Saito
    • 1
    • 2
  • S. Sánchez Majos
    • 1
  • B. S. Schlimme
    • 1
  • S. Širca
    • 5
  • M. Weinriefer
    • 1
  • C. J. Yoon
    • 1
  1. 1.Institut für KernphysikJohannes Gutenberg-UniversitätMainzGermany
  2. 2.Helmholtz Center for Heavy Ion ResearchGSIDarmstadtGermany
  3. 3.Department of PhysicsUniversity of ZagrebZagrebCroatia
  4. 4.Nuclear Physics InstitutePragueCzech Republic
  5. 5.University of Ljubljana and Jožef Stefan InstituteLjubljanaSlovenia

Personalised recommendations