63,214 research outputs found
LRR Focus: Solidarity NOT Charity
[Excerpt] Can global solidarity really help unions with their organizing efforts?
Only if we stop thinking about international solidarity as charity work for the developing world. Only if we recognize the limitations of isolated local union struggles against international corporations and financial institutions. Only if we build international union structures to support efforts in organizing more workers and bargaining collective agreements
Finite width induced modification to the electromagnetic form factors of spin-1 particles
The inclusion of the unstable features of a spin-1 particle, without breaking
the electromagnetic gauge invariance, can be properly accomplished by including
higher order contributions as done in the so-called fermion loop scheme (for
the W gauge boson), and the boson loop scheme (for vector mesons). This induces
a non trivial modification to the electromagnetic vertex of the particle, which
must be considered in addition to any other contribution computed as stable
particles. Considering the modified electromagnetic vertex, we obtain general
expressions for the corresponding corrections to the multipoles as a function
of the mass of the particles in the loop. For the W gauge boson no substantial
deviations from the stable case is observed. For the rho and K* mesons the mass
of the particles in the loop makes a significant effect, and can be comparable
with corrections of different nature .Comment: 11 pages, 1 figure. Extended discussion, main equations rewritten to
exhibit limiting behavior. Results for K* meson added. Accepted for
publication in PR
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