Roger William Lewis Jones

Theoretical uncertainties on

The precision of measurements of the strong coupling constant using event-shape variables in e +e- annihilations is limited by theoretical systematic uncertainties. The uncertainties are related to missing higher orders in the perturbative predictions for the event-shape distributions. A new method is presented for the assessment of theoretical uncertainties in α s . This method evaluates the systematic uncertainty of the parameter α s from the uncertainty of the prediction for the distributions from which it is extracted. The perturbative uncertainties are calculated on a purely theoretical basis, without accessing measured distributions. The method is therefore especially suited for an unbiased combination of results from different observables or experiments. It is universal and can be applied to other processes like jet production in deep-inelastic ep scattering or in hadron collisions.

\alpha_s

The current scope and status of projected B-physics studies with the ATLAS detector are presented. With the early low-luminosity running, high-statistics studies of various B-decay channels will allow measurements of the unitarity–triangle angles α and β and searches for deviations from the Standard Model. ATLAS will also perform measurements of Bs oscillations and of the Bs and Λb production and decay properties. ATLAS will be able to access rare B-decays using high- and low-luminosity running.

from event-shape variables in

The decays

annihilations

B_c^+ \rightarrow J/\psi D_s^+

Study of the B+c→J/ψD+sBc+→J/ψDs+ and B+c→J/ψD∗+sBc+→J/ψDs∗+ decays with the ATLAS detector

Bc+→J/ψDs+ and

Search for the glueball candidates f0(1500)and fJ(1710)in γγ collisions in ALEPH

B_c^+ \rightarrow J/\psi D_s^{*+}