A Measurement of the ATLAS Di-Muon Trigger Efficiency in Proton-Proton Collision at $\sqrt{s}=7$ TeV

Abstract

The B physics programme of the ATLAS experiment includes measurements of production cross sections, searches for rare B-decay signatures which are sensitive to new physics at the TeV energy scale and studies of CP violation effects in B-events, such as $B_s^0\to J/\psi \varphi$ and $B_d^0\to J/\psi K_s^0$. The key to the detection of these B signals in ATLAS is to achieve a high trigger efficiency for low-$p_T$ di-muon events, whilst keeping an acceptable trigger rate. ATLAS developed two separate approaches for triggering on di-muon events from resonances such as $J/\psi$ and Upsilon (${\rm Y}$). The first approach is to start from a di-muon trigger selected at Level-1 while the second is based on dedicated Level-2 algorithms. The performance for these triggers has been studied using collision data at $\sqrt{s}=7$ TeV collected in 2011.

arXiv commentPresented at the 2011 Hadron Collider Physics symposium (HCP-2011), Paris, France, November 14-18 2011, 3 pages, 6 figure

References in corpus (1)

• Expected Performance of the ATLAS Experiment - Detector, Trigger and Physics