Measurement of the forward backward asymmetry of

The Forward–backward Asymmetry in Nnlo Qcd

We have recently calculated the second-order QCD corrections to the forward–backward asymmetry in ee annihilation. Here we recall the results and compare them to others in the literature. RAL–TR–1999–048 CERN–TH/99–204 July 1999 Talk given by M. Seymour at 13th Rencontres de Physique de la Vallée d’Aoste, Results and Perspectives in Particle Physics, La Thuile, Aosta Valley, Italy, February 28t...

The forward-backward asymmetry at NNLO revisited

I reconsider the forward-backward asymmetry for flavoured quarks in electron-positron annihilation. I suggest an infrared-safe definition of this observable, such that the asymmetry may be computed in perturbative QCD with massless quarks. With this definition, the first and second order QCD corrections are computed.

Measurement of the Polarized Forward � Backward

We present a direct measurement of the parity-violating parameter A b by analyzing the left-right forward-backward asymmetry of b quarks in e + e ; !Z 0 ! bb. The SLD experiment observes hadronic decays of Z 0 bosons produced at resonance in collisions of longitudinally polarized electrons and unpolarized positrons at the SLC. Heavy avor decays of the Z 0 are identiied by using the topologicall...

Forward - backward and isospin asymmetry for B →

Measurement of the forward-backward charge asymmetry in top-quark pair production.

We present the first measurement of the integrated forward-backward charge asymmetry in top-quark-top-antiquark pair (tt) production in proton-antiproton (pp) collisions in the lepton+jets final state. Using a b-jet tagging algorithm and kinematic reconstruction assuming tt + X production and decay, a sample of 0.9 fb(-1) of data, collected by the D0 experiment at the Fermilab Tevatron Collider...