LHCbMapping the VELO Detector

By Abraham JacobSupervisors: Tom Latham and Tim Gershon

Introduction

The Vertex Locator (VELO)

Monte Carlo (MC) and Real Data

Monte Carlo algorithms can produce simulated data Can “reconstruct” the vertex in same way as real dataAlso MC truth data where vertex locations are knownWant to compare the simulated data to real data to make

sure simulation algorithms are as good as possible

Unfortunately not this Monte Carlo.

Mapping ATLAS detector

Images from ATLAS collaboration presented at ICHEP, Paris, July 22nd 2010.

MC Truth Data

z (mm)

x (mm)

MC data

Real Dataz (mm)

x (mm)

z (mm)

x (mm)

MC data

Real Data

MC Truth Data

Hadronic interactions in ATLAS

Images from ATLAS collaboration presented at ICHEP, Paris, July 22nd 2010.

Vertices with at least 3 output tracks

Radius against Z axis

Error in z position in mm