Measurements of $A_{CP}(B^0\rightarrow K^+ π^-)$ and $A_{CP}(B_s\rightarrow π^+ K^-)$ at LHCb

Details Measurements of $A_{CP}(B^0\rightarrow K^+ π^-)$ and $A_{CP}(B_s\rightarrow π^+ K^-)$ at LHCb Measurements of $A_{CP}(B^0\rightarrow K^+ π^-)$ and $A_{CP}(B_s\rightarrow π^+ K^-)$ at LHCb

2011-06-06

arxiv.org/abs/1106.1197v1

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

The LHCb experiment is designed to perform flavour physics measurements at the Large Hadron Collider. Using data collected during the 2010 run, we reconstruct a sample of $H_b\rightarrow h^+h'^-$ decays, where $H_b$ can be either a $B^0$ meson, a $B_s^0$ meson or a $\Lambda_b$ baryon, while $h$ and $h^\prime$ stand for $\pi$, $K$ or $p$. We provide preliminary values of the direct $\mathcal{CP}$ asymmetries of the neutral $B^0$ and $B_s^0$ mesons $A_{CP} (B^0\rightarrow K^+\pi^-) = -0.074 \pm 0.033\mathrm{(stat.)} \pm 0.008\mathrm{(syst.)}$ and $A_{CP}(B_s^0\rightarrow\pi^+K^-)=0.15 \pm 0.19\mathrm{(stat.)} \pm 0.02\mathrm{(syst.)}$.

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