Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-01-19
Nucl.Phys.B581:91-115,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages
Scientific paper
10.1016/S0550-3213(00)00249-2
The ambiguity in the definition for the mass and width of relativistic resonances is discussed, in particular for the case of the Z-boson. This ambiguity can be removed by requiring that a resonance's width $\Gamma$ (defined by a Breit-Wigner lineshape) and lifetime $\tau$ (defined by the exponential law) always and exactly fulfill the relation $\Gamma = \hbar/\tau$. To justify this one needs relativistic Gamow vectors which in turn define the resonance's mass M_R as the real part of the square root $\rm{Re}\sqrt{s_R}$ of the S-matrix pole position s_R. For the Z-boson this means that $M_R \approx M_Z - 26{MeV}$ and $\Gamma_R \approx \Gamma_Z-1.2{MeV}$ where M_Z and $\Gamma_Z$ are the values reported in the particle data tables.
Bohm Arno R.
Harshman N. L.
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