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What is soft-QCD? - High Energy Physics

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Underlying Event Measurements<br />

• How can we make measurements of the particle activity from the Underlying Event ?<br />

– Simple technique pioneered by CDF during Tevatron Run I<br />

– e.g. in di-jets : the activity from the hard parton-parton interaction produces two back-to-back jets (in the<br />

transverse plane)<br />

Emily Nurse<br />

Soft-<strong>QCD</strong><br />

26

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