Jul 16 – 22, 2009
Kraków, Poland
Europe/Warsaw timezone

CP-conserving and CP-violating properties in semileptonic Bs decays with the D0 experiment

Jul 16, 2009, 3:35 PM
15m
Large Lecture - Hall A (Kraków, Poland)

Large Lecture - Hall A

Kraków, Poland

The Auditorium Maximum of the Jagiellonian University 33 Krupnicza Street 31-123 Kraków
Flavour Physics II. Flavour Physics

Speaker

Dr Lars Sonnenschein (RWTH Aachen IIIA)

Description

A search for CP violation has been performed in a sample of semileptonic Bs decays corresponding to approximately 5 fb^-1 of data collected by the D0 detector in Run II at the Fermilab Tevatron collider. A time-dependent fit to the distributions of Bs candidates yields the flavour-specific asymmetry as_fs = [-1.7 pm 9.1 (stat) +1.2-2.3 (syst)] x 10^-3, corresponding to the most precise measurement to date for this CP violation parameter. Furthermore a search for the semi-inclusive process Bs to Ds(*)Ds(*) has been performed on a data sample of 2.8fb^-1. 26.6 pm 8.4 signal events are observed with a significance of 3.2 standard deviations above background, leading to a branching ratio of 0.035 pm 0.010 (stat) pm 0.011 (syst). Under certain theoretical assumptions, these double-charm final states saturate CP-even eigenstates in the Bs decays, resulting in a width difference of DeltaGamma_s(CP)/Gamma_s = 0.072 pm 0.021 (stat) pm 0.022 (syst).

Primary author

Dr Lars Sonnenschein (RWTH Aachen IIIA)

Presentation materials