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Measurements of the quadrupole strengths in the N → Δ transition at Mainz and Bates

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Published: Jan 1, 2020
DOI: https://doi.org/10.12681/hnps.2616
N. F. Sparveris
UoA
Abstract

The issue of hadron deformation has been a subject of intense scientific interest during the last two decades. The detailed study of the N → Δ transition is the best method of experimental investigation of this issue. The most recent results from the Bates and Mainz N → Δ programs will be presented which focus at the low Q2 region. The experimental data yield precise non zero quadrupole to dipole amplitude EMR and CMR ratios, giving credence to the conjecture of deformation in hadrons favoring the attribution of the origin of deformation at the low Q2 region to the dominance of mesonic effects.

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References
C.N.Papanicolas, Eur. Phys. J. A 18, 141-14 (2003)
S.L. Glashow, Physica 96A, 27 (1979)
C. Alexandrou et al., Phys. Rev D69 114506 (2004)
Phys. Rev. Lett. 94, 021601 (2005)
A. de Rujula, H. Georgi and S.L. Glashow et al., Phys. Rev D12,147 (1975)
N. Isgur, G. Karl and R. Koniuk, Phys. Rev. D25, 2394 (1982)
S. Capstick and G. Karl, Phys. Rev. D41, 2767 (1990).
G. Blanpied et al., Phys. Rev. Lett. 79, 4337 (1997).
R. Beck et al., Phys. Rev. Lett. 78, 606 (1997)
Phys. Rev. C61, 35204 (2000)
G.A. Warren et al., Phys. Rev. C58, 3722 (1998).
C. Mertz et al., Phys. Rev. Lett. 86, 2963 (2001).
N.F. Sparveris et al., Phys. Rev. Lett. 94, 022003 (2005)
Phys. Rev. C67, 058201 (2003).
T. Pospischil et al., Phys. Rev. Lett. 86 2959 (2001).
S. Stave et al., nucl-ex/0604013 and N.F. Sparveris et al., to be published.
D. Drechsel and L. Tiator, J. Phys. G: Nucl. Part. Phys. 18, 449 (1992)
A. S. Raskin and T. W. Donnelly, Ann. Phys. 78 191
D. Drechsel et al., Nucl. Phys. A645, 145 (1999)
T. Sato and T.-S.H. Lee, Phys. Rev. C63, 055201 (2001).
S.S. Kamalov and S. Yang, Phys. Rev. Lett. 83, 4494 (1999)
S.S. Kamalov et al., Phys. Lett. B 522, 27 (2001).
V. Pascalutsa and M. Vanderhaegen et al., Phys. Rev. Lett. 95, 232001 (2005)
V. Pascalutsa and M. Vanderhaegen et al., Phys. Rev. D73, 034003 (2006).
C.N. Papanicolas et al., Nucl. Phys. A 497, 509 (1989).
S. Dolfini et al., Nucl. Inst. and Meth. A 344, 571 (1994).
J. Mandeville et al., Nucl. Inst. and Meth. A 344, 583 (1994).
Z.-L. Zhou et al., Nucl. Inst. and Meth. A 487, 365 (2002).
C. Kunz et al., Phys. Lett. B 564, 21 (2003).
C.N. Papanicolas et al., Bates Proposal 97-09 and updates; C. Mertz
C.N. Papanicolas, IASA internal report 98-21 (1998)
A.M. Bernstein, Europ. Phys. J. A 17, 349 (2003).
A. J. Buchmann, et al., Phys. Rev. C55,448 (1997)
Phys. Rev. C63, 015202 (2000).
S. Stave, Ph.D. thesis, MIT, 2006 (to be published).
K.I. Blomqvist et al., Nucl. Instrum. Methods A 403, 263 (1998).
K. Joo et al. Phys., Rev. Lett. 88, 122001 (2002).
D. Elsner et al., Europ. Phys. J. A 27 91-97 (2006).