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            <title xml:lang="en">The Mu3e Data Acquisition</title>
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                <title xml:lang="en">The Mu3e Data Acquisition</title>
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                <term xml:lang="en">computer: network</term>
                <term xml:lang="en">FPGA</term>
                <term xml:lang="en">fibre: optical</term>
                <term xml:lang="en">electronics: readout</term>
                <term xml:lang="en">electronics: design</term>
                <term xml:lang="en">multiprocessor: graphics</term>
                <term xml:lang="en">hardware</term>
                <term xml:lang="en">sensitivity</term>
                <term xml:lang="en">scintillation counter</term>
                <term xml:lang="en">data acquisition</term>
                <term xml:lang="en">lepton: flavor: violation</term>
                <term xml:lang="en">muon+: decay</term>
                <term xml:lang="en">semiconductor detector: pixel</term>
                <term xml:lang="en">printed circuits</term>
                <term xml:lang="en">high energy physics instrumentation</term>
                <term xml:lang="en">field programmable gate arrays (FPGAs)</term>
                <term xml:lang="en">Data acquisition (DAQ)</term>
                <term xml:lang="en">Clocks</term>
                <term xml:lang="en">Optical switches</term>
                <term xml:lang="en">Mesons</term>
                <term xml:lang="en">Optical fiber communication</term>
                <term xml:lang="en">Data acquisition</term>
                <term xml:lang="en">Field programmable gate arrays</term>
                <term xml:lang="en">Detectors</term>
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              <p>The Mu3e experiment aims to find or exclude the lepton flavor violating decay &lt;inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"&gt; &lt;tex-math notation="LaTeX"&gt;$\mathrm {\mu ^{+}\to e^{+}e^{-}e^{+}}$ &lt;/tex-math&gt;&lt;/inline-formula&gt; with a sensitivity of one in 10&lt;sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"&gt;16&lt;/sup&gt; muon decays. The first phase of the experiment is currently under construction at the Paul Scherrer Institute (PSI, Switzerland), where beams with up to 10&lt;sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"&gt;8&lt;/sup&gt; muons per second are available. The detector will consist of an ultra-thin pixel tracker made from &lt;italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"&gt;High-Voltage Monolithic Active Pixel Sensors (HV-MAPS)&lt;/i&gt;, complemented by scintillating tiles and fibers for precise timing measurements. The experiment produces about 100Gbit/s of zero-suppressed data, which are transported to a filter farm using a network of field programmable gate arrays (FPGAs) and fast optical links. On the filter farm, tracks and three-particle vertices are reconstructed using highly parallel algorithms running on graphics processing units, leading to a reduction of the data to 100 Mbyte/s for mass storage and offline analysis. This article introduces the system design and hardware implementation of the Mu3e data acquisition and filter farm.</p>
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