A High-Pt Trigger for the HERA-B Experiment

Abstract

We have constructed a high-$p_T$ trigger for the HERA-B experiment at DESY. The HERA-B experiment produces B mesons by inserting wire targets into the halo of the proton beam circulating in HERA. The high-\pt trigger records events that contain tracks that have high transverse momentum with respect to the beam. Such a trigger is efficient for recording $B\to {\pi }^{+}{\pi }^{-}$, $B\to K^{-}{\pi }^{+}$, $B_s\to K^{+}{K}^{-}$, $B_s\to D_s^{-}{\pi }^{+}$, and other topical hadronic B decays. These decays provide sensitivity to the internal angles $\alpha$ and $\gamma$ of the CKM unitarity triangle, and they also can be used to measure or constrain the $B_s$-${\bar{B}}_s$ mixing parameter $x_s$.

3 pages, 3 figures, contribution to DPF2000, The Meeting of the APS Division of Particles and Fields, August 9-12, 2000, Columbus, Ohio

References in corpus (1)

• HERA-B: Physics Potential and Prospects