Final state photon bremsstrahlung ine + e ??Z 0?hadrons as a tool for a precise measurement of the weak quark couplings | Zendy

P. M�ttig | Zendy; W. Zeuner | Zendy

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Final state photon bremsstrahlung ine + e ??Z 0?hadrons as a tool for a precise measurement of the weak quark couplings

Author(s) -

P. M�ttig,

W. Zeuner

Publication year - 1991

Publication title -

zeitschrift für physik c

Language(s) - English

Resource type - Journals

eISSN - 1431-5858

pISSN - 0170-9739

DOI - 10.1007/bf01412324

Subject(s) - physics , asymmetry , particle physics , hadron , observable , photon , quark , nuclear physics , bremsstrahlung , charge (physics) , quantum mechanics

We discuss for the processe+e−→Z0→q $\bar q$ how final state photons can be used to disentangle the weak couplings of up and down type quarks. Since the flavour composition of multihadronic events with final state photons is different from that of all multihadrons, a combination of observables from the two samples allows the couplings to be determined. Both theZ0 width and the forward-backward charge asymmetry at centre-of-mass energies aroundMZ0 can be used to constrain the weak couplings. Taking into account the theoretical uncertainties a precision for the sum of the square axial and vector couplings of δ(v2+a2)∼4% for up and down type quarks separately seems feasible for 106Z0's. The precision from asymmetry measurements will be less significant.