메뉴 건너뛰기




Volumn 904, Issue , 2007, Pages 110-125

Charge form factors and nucleon shape

Author keywords

Electroexcitation of nucleon resonances; Nucleon intrinsic quadrupole form factor; Spin flavor symmetry

Indexed keywords


EID: 34547488395     PISSN: 0094243X     EISSN: 15517616     Source Type: Conference Proceeding    
DOI: 10.1063/1.2734297     Document Type: Conference Paper
Times cited : (13)

References (79)
  • 6
    • 34547464072 scopus 로고    scopus 로고
    • 2) in order to emphasize the parallels between elastic and inelastic charge form factors.
    • 2) in order to emphasize the parallels between elastic and inelastic charge form factors.
  • 7
    • 34547473488 scopus 로고    scopus 로고
    • The four momentum is defined as Q2, qμ q μ= ω2, q2, with q μ, ω, q) where ω, εi, εf is the energy transfer and q, ki, kf the three-momentum transfer of the virtual photon. Here, εi, ki and (εf, kf) are the electron energy and three-momentum in the initial and final states
    • f) are the electron energy and three-momentum in the initial and final states.
  • 8
    • 34547487764 scopus 로고    scopus 로고
    • Experimentally, the cross section is measured for different incident energies εi and scattering angles Θ while keeping Q 2 and ω fixed. The ratio r, dσ/dΩ) el/(σMfrec) is then only a function of tan2(Θ/2, When plotting the measured ratio r against tan 2(Θ/2) the resulting curve is a linear function with a slope given by GMN2 and an intercept by GC N2, τGMN2, 1, τ, The extraction of the charge form factor becomes increasingly more inaccurate at higher momentum transfers because of its suppression by the factor τ
    • N2)/(1 + τ). The extraction of the charge form factor becomes increasingly more inaccurate at higher momentum transfers because of its suppression by the factor τ.
  • 12
    • 34547452047 scopus 로고    scopus 로고
    • The different results for the nucleon form factors obtained from both types of experiment can to some extent be understood in terms of two-photon exchange contributions, which affect the extraction of the form factors from the unpolarized cross section whereas the recoil polarization measurements are less sensitive to these corrections [12
    • The different results for the nucleon form factors obtained from both types of experiment can to some extent be understood in terms of two-photon exchange contributions, which affect the extraction of the form factors from the unpolarized cross section whereas the recoil polarization measurements are less sensitive to these corrections [12].
  • 27
  • 30
    • 33845950857 scopus 로고    scopus 로고
    • S. Stave et al., Eur. Phys. J. A 30, 471 (2006); nucl-ex/0604013
    • S. Stave et al., Eur. Phys. J. A 30, 471 (2006); nucl-ex/0604013
  • 37
    • 10744227550 scopus 로고    scopus 로고
    • C. Alexandrou, Nucl. Phys. Proc. Suppl. 128, 1 (2004), arXiv:nucl-th/0311007.
    • C. Alexandrou, Nucl. Phys. Proc. Suppl. 128, 1 (2004), arXiv:nucl-th/0311007.
  • 42
    • 0036540126 scopus 로고    scopus 로고
    • Phys. Rev. D 65, 073017 (2002).
    • (2002) Phys. Rev. D , vol.65 , pp. 073017
  • 50
    • 0033433227 scopus 로고    scopus 로고
    • R.F. Lebed, Czech. J. Phys. 49, 1273 (1999); nucl-th/9810080. This paper contains a pedagogical introduction to this method.
    • R.F. Lebed, Czech. J. Phys. 49, 1273 (1999); nucl-th/9810080. This paper contains a pedagogical introduction to this method.
  • 52
    • 0034621106 scopus 로고    scopus 로고
    • hep-ph/0208045; hep-ph/0207368; hep-ph/0301031
    • A.J. Buchmann, Nucl. Phys. A 670, 174c (2000); hep-ph/0208045; hep-ph/0207368; hep-ph/0301031.
    • (2000) Nucl. Phys. A , vol.670
    • Buchmann, A.J.1
  • 56
    • 0035419722 scopus 로고    scopus 로고
    • Phys. Rev. C 64 025203 (2001).
    • (2001) Phys. Rev. C , vol.64 , pp. 025203
  • 57
    • 0035848128 scopus 로고    scopus 로고
    • 2].
    • 2].
  • 59
    • 34547432457 scopus 로고    scopus 로고
    • Our definition is equivalent to the definition C2/M1, q, 2MΔ, G*CG*M based on the dimensionless transition form factors G*C and G*M employed by a number of authors [14, The advantage of our GC2N→Δ(Q2) and GM1 N→Δ(Q2) is that they correspond to the familiar electromagnetic multipole moments in the Q → 0 limit
    • 2) is that they correspond to the familiar electromagnetic multipole moments in the Q → 0 limit.
  • 60
    • 34547470891 scopus 로고    scopus 로고
    • In this frame |q, Q2, MΔ 2, MN2, Q22/(4M Δ2))1/2, where MΔ, 1232 MeV is the Δ mass. For Q2, 0 one obtains |q, M Δ2, MN2, 2M Δ, 258 MeV
    • Δ) = 258 MeV
  • 64
    • 0002090478 scopus 로고    scopus 로고
    • V.V. Frolov et al., Phys. Rev. Lett. 82, 45 (1998). In this paper the C2/M1 ratio is extracted from the cross section using two methods: (i) a multipole fit to the pion angular distributions, (ii) a Lagrangian model. I take the results of method (i), which uses fewer assumptions. In this context see also [56].
    • V.V. Frolov et al., Phys. Rev. Lett. 82, 45 (1998). In this paper the C2/M1 ratio is extracted from the cross section using two methods: (i) a multipole fit to the pion angular distributions, (ii) a Lagrangian model. I take the results of method (i), which uses fewer assumptions. In this context see also [56].
  • 67
    • 34547478135 scopus 로고    scopus 로고
    • Phys. Rev. C 72, 059901(E) (2005).
    • (2005) Phys. Rev. C , vol.72
  • 69
    • 34547482844 scopus 로고    scopus 로고
    • 2 = 0, Siegert's theorem is very well satisfied [59].
    • 2 = 0, Siegert's theorem is very well satisfied [59].
  • 72
    • 0039975036 scopus 로고
    • Nucl. Phys. A 569, 661 (1994).
    • (1994) Nucl. Phys. A , vol.569 , pp. 661
  • 73
    • 17044433817 scopus 로고    scopus 로고
    • 2. The mass relation is experimentally well satisfied.
    • 2. The mass relation is experimentally well satisfied.
  • 77
    • 34547406615 scopus 로고    scopus 로고
    • p.
    • p.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.