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Heavy Flavor

Depending on the energy scale, there are two mechanisms that generate quark masses with different degrees of importance: current quark masses are generated by the electroweak symmetry breaking mechanism (Higgs mass) and spontaneous chiral symmetry breaking leads to the constituent quark masses in QCD (QCD mass). The QCD interaction strongly affects the light quarks (u, d, s) while the heavy quark masses (c, b, t) are mainly determined by the Higgs mechanism. In high-energy nuclear collisions at RHIC, heavy quarks are produced through gluon fusion and qq¯ annihilation. Heavy quark production is also sensitive to the parton distribution function. Unlike the light quarks, heavy quark masses are not modified by the surrounding QCD medium (or the excitations of the QCD medium) and the value of their masses is much higher than the initial excitation of the system. It is these differences between light and heavy quarks in a medium that make heavy quarks an ideal probe to study the properties of the hot and dense medium created in high-energy nuclear collisions.

 

Heavy flavor analyses at STAR can be separated into quarkonia, open heavy flavor and heavy flavor leptons.

 

L0 Trigger: Systematic Uncertainty

Updated on Mon, 2012-05-07 14:19. Originally created by peterson on 2012-05-07 14:19.

 

2009 BTOW Calibrations

Upsilon Paper: pp, d+Au, Au+Au

Updated on Thu, 2013-03-07 02:20. Originally created by calderon on 2012-05-03 15:50.

 Page to collect the information for the Upsilon paper based on the analysis of

Upsilon Analysis in p+p 2009 - L0 Trigger

Updated on Thu, 2012-05-24 13:24 by calderon. Originally created by wimsatt on 2012-04-29 17:55.

 

2009 BTOW Calibrations

D0/D* 500 GeV p+p

Updated on Tue, 2012-04-17 08:47 by tlusty. Originally created by weixie on 2012-04-13 15:46.

Reference

Speaker : David Tlusty


Talk time : 11:30, Duration : 00:30

Electron Embedding Problem

Updated on Wed, 2012-03-07 18:56. Originally created by khill on 2012-03-02 20:13.

I have been playing around with the 2009 upsilon and single electron embeddings and noticed a potential problem.  In a given pT region, the ADC count distributions do not align.  Thi

P10ic Embedding Summary

Updated on Fri, 2011-12-16 16:19. Originally created by mstftsm on 2011-12-16 16:00.

 

P10ic embedding:

J/Psi polarization (EVO)

Updated on Wed, 2011-11-16 11:12 by trzeciak. Originally created by weixie on 2011-11-07 10:44.

Reference

Speaker : Barbara Trzeciak


Talk time : 09:00, Duration : 00:30

Upsilon Analysis in p+p 2009 data - Dataset QA

Updated on Fri, 2011-12-16 19:49. Originally created by peterson on 2011-09-09 19:14.