A High-Pt Trigger for the HERA-B Experiment

TL;DR

This paper describes the development of a high transverse momentum trigger system for the HERA-B experiment, enabling efficient detection of specific B meson decay events crucial for studying CP violation and mixing parameters.

Contribution

The paper introduces a novel high- extit{p}_T trigger specifically designed for the HERA-B experiment to improve detection of hadronic B decays.

Findings

Efficient recording of B decay events with high transverse momentum.

Enhanced sensitivity to CKM angles nd nd B_s mixing parameters.

Potential for improved measurements of CP violation in B decays.

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 $x_s$.