Nucleon to delta electromagnetic transition form factors in lattice QCD

被引：65
作者：
Alexandrou, C. [1 ]
Koutsou, G. [1 ]
Neff, H. [2 ]
Negele, J. W. [3 ]
Schroers, W. [4 ]
Tsapalis, A. [5 ]
机构：
[1] Univ Cyprus, Dept Phys, CY-1678 Nicosia, Cyprus
[2] UCL, Ctr Comp Sci, London WC1, England
[3] MIT, Ctr Theoret Phys, Cambridge, MA 02139 USA
[4] Natl Taiwan Univ, Ctr Theoret Sci, Dept Phys, Taipei 10617, Taiwan
[5] Univ Athens, Inst Accelerating Syst & Applicat, Athens, Greece
来源：
PHYSICAL REVIEW D | 2008年 / 77卷 / 08期
关键词：
D O I：
10.1103/PhysRevD.77.085012
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The electromagnetic nucleon to Delta transition form factors are evaluated using two degenerate flavors of dynamical Wilson fermions and using dynamical sea staggered fermions with domain-wall valence quarks. The two subdominant quadrupole form factors are evaluated for the first time in full QCD to sufficient accuracy to exclude a zero value, which is taken as a signal for deformation in the nucleon-Delta system. For the Coulomb quadrupole form factor the unquenched results begin to deviate from the quenched results at low q(2) indicating that dynamical lattice results are closer to experiment. This can be taken as a first confirmation of the expected importance of pion cloud contributions on this quantity.
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页数：17
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