Research

- b-tagging for Heavy Ions

Introduction

Heavy-Ion Collisions at the Large Hadron Collider (sqrt(s) = 5.5 A TeV for Pb+Pb collisions) will open new perspectives in the study of QGP properties in the laboratories. In particular, rare heavy quark jets are valuable and independent probes of the intensity of color field fluctuations in the sQGP because their high mass (mc » 1.2GeV, mb » 4.75 GeV) changes the sensitivity of both elastic and inelastic energy loss mechanism in a well defined way relative to light quark and gluon jets. The CMS detector at LHC, equipped with Silicon pixel tracker, PbWO4 crystal electromagnetic calorimeter, brass plastic scintillator hadronic calorimeter and well designed muon system, is capable of measuring the heavy quark jets and studying the in-medium properties (heavy quark coefficient, q-hat transport coefficient etc.). In our study, we have typically focused on measuring the b-jets (jets evolving from b quarks)

Methods Used

We have used the following methods, designed by the btagging group to find bjets in relativtistic heavy ion collisions (Pb-Pb @ 5.5 ATeV) :

Impact Parameter Tag (Track Counting Tag, Track Probabability Tag)

CombinedSV Tag

SoftLepton Tag

Method Details

Data Sample Used

Minimum Bias Pb-Pb @ 5.5 ATeV

Preliminary Results

Testing with pp data

References

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