Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Keister, B. D."'
Autor:
Keister, B. D.
Publikováno v:
Phys. Scr. 90, 088008 (2015)
This paper examines neutrino flavor evolution outside a supernova neutrinosphere using a one-dimensional model that retains the non-linear nature of neutrino-neutrino interactions as well as some aspects of the full geometry. In some limiting cases a
Externí odkaz:
http://arxiv.org/abs/1408.4729
Autor:
Polyzou, W. N., Keister, B. D.
Using a simple model we provide a quantitative study of the size of the corrections needed to restore cluster properties to the construction of Poincare invariant dynamical models with kinematic spins, first provided by B. Bakamjian and L. H. Thomas.
Externí odkaz:
http://arxiv.org/abs/1210.1636
Autor:
Keister, B. D., Polyzou, W. N.
A relativistically invariant quantum theory first advanced by Bakamjian and Thomas has proven very useful in modeling few-body systems. For three particles or more, this approach is known formally to fail the constraint of cluster separability, where
Externí odkaz:
http://arxiv.org/abs/1109.6575
Autor:
Keister, B. D., Polyzou, W. N.
Publikováno v:
Phys.Scripta 81:055102,2010
Neutrino oscillations are examined under the broad requirements of Poincar\'e-invariant scattering theory in an S-matrix formulation. This approach can be consistently applied to theories with either field or particle degrees of freedom. The goal of
Externí odkaz:
http://arxiv.org/abs/0908.1404
Autor:
Keister, B. D., Polyzou, W. N.
Publikováno v:
Phys.Rev. C73 (2006) 014005
The quantitative impact of the requirement of relativistic invariance in the three-nucleon problem is examined within the framework of Poincar\'e invariant quantum mechanics. In the case of the bound state, and for a wide variety of model implementat
Externí odkaz:
http://arxiv.org/abs/nucl-th/0508001
Autor:
Keister, B. D.
Sum rules based upon heavy quark effective theory indicate that the Isgur-Wise function $\xi(w)$ has a minimum slope as w approaches 1, which is zero for light degrees of freedom with zero spin and 1/4 for light spin 1/2. Quark-model studies reveal s
Externí odkaz:
http://arxiv.org/abs/hep-ph/9703310
Autor:
Capstick, Simon, Keister, B. D.
Current matrix elements and observables for electro- and photo-excitation of baryons from the nucleon are studied in a light-front framework. Relativistic effects are examined by comparison to a nonrelativistic model and can typically be of order 20-
Externí odkaz:
http://arxiv.org/abs/nucl-th/9701007
Autor:
Capstick, Simon, Keister, B. D.
Magnetic moments of baryons in the ground-state octet and decuplet are calculated in a light-front framework. We investigate the effects of quark mass variation both in the current operator and in the wavefunctions. A simple fit uses single oscillato
Externí odkaz:
http://arxiv.org/abs/nucl-th/9611055
Autor:
Keister, B. D., Polyzou, W. N.
Publikováno v:
J.Comput.Phys. 134 (1997) 231-235
A set of exactly computable orthonormal basis functions that are useful in computations involving constituent quarks is presented. These basis functions are distinguished by the property that they fall off algebraically in momentum space and can be e
Externí odkaz:
http://arxiv.org/abs/nucl-th/9611049
Autor:
Keister, B. D.
Publikováno v:
Phys.Rev.C55:2171-2174,1997
The deuteron axial current is sensitive both to the form of the implementation of relativistic dynamics as well as to the details of the deuteron D state at moderate momentum transfer, making it a natural partner to the magnetic form factor for explo
Externí odkaz:
http://arxiv.org/abs/nucl-th/9610050