Charmless B Decays at LHCb

The potential of the LHCb experiment to test the Standard Model and probe New Physics effects by making precision measurements using decays of $B$ hadrons to charmless hadronic final states is explored. The CKM angle $\gamma$ can be measured using NP-sensitive decays involving penguin amplitudes. A U-spin analysis of the time-dependent CP asymmetries in the decays $B_d \rightarrow \pi^{+}\pi^{-}$ and $B_s\rightarrow K^{-}K^{+}$ is expected to give a total uncertainty on $\gamma$ of $\simeq$ 7° with one nominal year of data. A similar sensitivity is achievable via a Dalitz analysis of $B^{+} \rightarrow K^{+} \pi^{+} \pi^{-}$ and $B_d \rightarrow K_S \pi^{+} \pi^{-}$. With relatively small amounts of data, discoveries of the rare modes $B_d\rightarrow K^{+} K^{-}, B_s \rightarrow \pi^{+}\pi^{-}$ and $B_d \rightarrow p\bar{p}$ are expected. The ultra-rare modes $B^{+} \rightarrow K^{-}\pi ^{+}\pi^{+}$ and $B^{+} \rightarrow K^{+} K^{+}\pi^{-}$ may be observed if their branching ratios are significantly enhanced by NP effects.