Electromagnetic and spin polarisabilities in lattice QCD
نویسندگان
چکیده
We discuss the extraction of the electromagnetic and spin polarisabilities of nucleons from lattice QCD [1]. We show that the external field method can be used to measure all the electromagnetic and spin polarisabilities including those of charged particles. We then turn to the extrapolations required to connect such calculations to experiment in the context of chiral perturbation theory, finding a strong dependence on the lattice volume and quark masses.
منابع مشابه
Composite vector particles in external electromagnetic fields
Citation Davoudi, Zohreh, and William Detmold. "Composite vector particles in external electromagnetic fields. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Latt...
متن کاملQuark transverse charge densities in the ∆(1232) from lattice QCD
We extend the formalism relating electromagnetic form factors to transverse quark charge densities in the light-front frame to the case of a spin-3/2 baryon and calculate these transverse densities for the ∆(1232) isobar using lattice QCD. The transverse charge densities for a transversely polarized spin-3/2 particle are characterized by monopole, dipole, quadrupole, and octupole patterns repre...
متن کاملWhat We Are Learning about the Quark Structure of Hadrons from Lattice Qcd
Developments in lattice field theory and computer technology have led to dramatic advances in the use of lattice QCD to explore the quark structure of hadrons. This talk will describe selected examples, including structure functions, electromagnetic form factors, the nucleon axial charge, the origin of the nucleon spin, the transverse structure of the nucleon, and the nucleon to Delta transitio...
متن کاملNeutron electric dipole moment on the lattice
We carry out a feasibility study toward a lattice QCD calculation of the neutron electric dipole moment (NEDM) in the presence of the θ term using two different approaches. In the first method, we calculate the CP-odd electromagnetic form factor F3, which becomes the NEDM in the zero momentum transfer limit. At the first order in θ , we derive a formula connecting the lattice three-point functi...
متن کاملTopics in Effective Field Theory for Lattice QCD
Quantitatively understanding hadronic physics from first principles requires numerical solutions to QCD, known as lattice QCD, which are necessarily performed with a finite spatial extent at finite lattice spacing. Current simulations employ quark masses that are heavier than those in nature, as lighter quarks are computationally too costly, the physical systems simulated are not significantly ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2006