Abstract
LHCb is a dedicated flavour physics experiment at the Large Hadron Collider at CERN. The Vertex Locator (VELO) is an important part of a LHCb tracking system, enabling precision measurement of beauty and charm mesons' flight distance. The VELO consist of a set of silicon micro-strip detectors, arranged in two retractable halves, operating only 7 mm from the interaction region. In these proceedings the VELO performance during the Run 1 is summarised and radiation damage studies are presented.
Highlights
LHCb physics program▸ Search for new physics using heavy flavour mesons ▸ Study CP violation and rare decays with beauty and charm hadrons
▸ VELO consist of 42 modules ▸ Modules have two (R and Phi) microstrip silicon oxygenated n+-on-n sensors ▸ Sensors are 300 μm thick, strip pitches: 40-100 μm ▸ Evaporative CO2 cooling system to keep sensors in -7oC ▸ The geometrical acceptance of the VELO is 15-390 mrad
Alternative method - Collection Efficiency scan (CCE) ▸ A tested sensor is excluded from the track fit, ▸ A voltage bias scan is performed on it and the charge deposited in sensor around the track intercept is measured ▸ plot the MPV vs bias voltage
Summary
▸ Search for new physics using heavy flavour mesons ▸ Study CP violation and rare decays with beauty and charm hadrons. To achieve such wide scientific program the crucial requirements for a detector are: ▸ very good vertex separation power, ▸ fast tracking for the HLT trigger, ▸ withstand severe radiation environment
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