Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2001-03-18
Int.J.Mod.Phys. A16S1C (2001) 1156-1158
Physics
High Energy Physics
High Energy Physics - Experiment
3 pages, 3 figures, contribution to DPF2000, The Meeting of the APS Division of Particles and Fields, August 9-12, 2000, Colum
Scientific paper
10.1142/S0217751X01009181
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 $x_s$.
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