36 research outputs found
The Excess of HERA High Events and Leptoquarks in a Left-Right Symmetric Preon Model
An interpretation that the HERA excess events are due to intermediate
production and decay of composite leptoquarks in the left-right symmetric preon
model is given. Because of the preon-line rule, expected to be valid well, the
event-ratio of neutral to charged current interactions is predicted to be one.Comment: 7 page
Algebraic structure of the Feynman propagator and a new correspondence for canonical transformations
We investigate the algebraic structure of the Feynman propagator with a
general time-dependent quadratic Hamiltonian system. Using the Lie-algebraic
technique we obtain a normal-ordered form of the time-evolution operator, and
then the propagator is easily derived by a simple ``Integration Within Ordered
Product" (IWOP) technique.It is found that this propagator contains a classical
generating function which demonstrates a new correspondence between classical
and quantum mechanics
Lattice study of "f(600) or "
We investigate the propagator of "f(600) or the " by the
full-QCD simulation with Wilson fermions. We calculate the mesonic correlator
in the I=0, channel on the lattice. Plaquet
action and Wilson fermion action are adopted. A coupling constant is
set to 4.8 and three kinds of hopping parameter, =0.1846, 0.1874 and
0.1891 are assayed. The disconnected diagram in the propagator is evaluated
through taking average over 500 or 1000 Z2 noise. Simulations with the larger
hopping parameter provide us with less noisy results. Though the statistics is
not yet enough, our results indicate the existence of a pole with a mass in
almost the same order as that of the .Comment: Talk given at 20th International Symposium on Lattice Field Theory
(LATTICE 2002), Boston, Massachusetts, 24-29 Jun 200