Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-02-02
Phys.Rev.Lett.102:181601,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages/3 figs /1 table
Scientific paper
10.1103/PhysRevLett.102.181601
We carry out high-precision calculation of parity violation in cesium atom, reducing theoretical uncertainty by a factor of two compared to previous evaluations. We combine previous measurements with our calculations and extract the weak charge of the 133Cs nucleus, Q_W = -73.16(29)_exp(20)_th. The result is in agreement with the Standard Model (SM) of elementary particles. This is the most accurate to-date test of the low-energy electroweak sector of the SM. In combination with the results of high-energy collider experiments, we confirm the energy-dependence (or "running") of the electroweak force over an energy range spanning four orders of magnitude (from ~10 MeV to ~100 GeV). Additionally, our result places constraints on a variety of new physics scenarios beyond the SM. In particular, we increase the lower limit on the masses of extra $Z$-bosons predicted by models of grand unification and string theories.
Beloy Kyle
Derevianko Andrei
Porsev Sergey G.
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