Non-photonic Single Electron Spectra from TOF 

in Au+Au 200 GeV Collisions @ RHIC

• Introduction

• Data sets and cuts

• Electron identification

• Photonic background subtraction

• Efficiency and acceptance corrections

• Systematic error estimation

• Results and discussions

• Form factors

• Charm total cross section

Introduction

       The interactions of heavy flavor hadrons with the medium are ideal probes to the hot and dense nuclear matter created in heavy ion collisions. Due to the large charm quark masses, theoretical calculation predicts that charm production is sensitive to the initial parton distribution function. The single electrons from charmed hadrons semi-leptonic decay can provide information on heavy quark production. When there is difficult to measure charm cross section, single electron measurement is an ideal way. The single electron spectra from dAu collisions at 200 GeV has been published (PRL 94, 062301).  

Data sets and cuts

     Run IV 200GeV AuAu collision data

     TPC, TOFr+TOFp

     Full Field + Reversed Full Field

     1) Minimum Bias 0-80%:

         Production P05ia

         |VertexZ|<30cm

         Trigger id: 15007

         Total events: 13.2M (after cut)

         TOF  events:  7.8M   (after cut)

     2) Central 0-10%

         Production P05ic, High/Mid/Low

         Trigger id: 15105

         Total events:  30M (after cut)

         TOF  events: 12M (after cut)

Electron identification

Photonic background subtraction

Efficiency and acceptance corrections

Systematic error estimation

Results and discussions

Form factors

Charm total cross section

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Last modified: Sunday, February 05, 2006 00:31:24