Mainz 2014 – scientific programme

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T: Fachverband Teilchenphysik

T 43: Flavourphysik 2 (CP Verletzung)

T 43.9: Talk

Monday, March 24, 2014, 18:45–19:00, GFH 01-701

Measuring the semileptonic CP asymmetry in B⁰-meson mixing at LHCb — •Lucia Grillo for the LHCb Gruppe Physikalisches Institut Heidelberg collaboration — Physikalisches Institut, Heidelberg, Germany

Measurements of CP violation in the neutral B⁰-meson system probe the mixing dynamics which, in the Standard Model, is described by higher order loop diagrams. The CP violation in mixing processes is predicted to be very small (O(10⁻⁴) for B⁰), but could be enhanced by new physics contributions. The observable is thus an ideal tool to look for phenomena beyond our current theoretical description. Experimentally CP violation in mixing can be accessed by measuring the flavour-specific semileptonic asymmetry (known as a_sl^d for the B⁰-meson).

For the slowly oscillating semileptonic B⁰ decays the mixing asymmetry is distinguished from a possible production asymmetry by performing a time-dependent analysis. The analysis uses semileptonic B⁰ → D^*−µ⁺ν_µ decays and B⁰ → D⁻µ⁺ν_µ decays collected in 2011 and 2012 by the LHCb detector.