Research Review

June - November 2007Colin McEnroe

Overview

Began June 2007 Simple simulations Lambda Feeddown Correction Current: CuCu200 μDST

Simulations C++

Random λC+ four momentum

generation•Thrown into detector using STARSIM

λ Feeddown Correction Wrote C++ code for two body decay Adapted from λc

+ generation Verifying Daniel’s results Looked at DCA < 3.0 cm pions and protons

μDST Analysis Looking at μDST

η vs. TPC Hits

μDST Analysis Looking at μDST

η vs. TPC Hits•Detector effects apparent

dE/dx

μDST Analysis Looking at μDST

η vs. TPC Hits•Detector effects apparent

dE/dx•Colorful to exhibit particle statistics

μDST Analysis Looking at μDST

η vs. TPC Hits•Detector effects apparent

dE/dx•Colorful to exhibit particle statistics

•Tightening nSigma cuts to select particles

μDST Analysis Looking at μDST

η vs. TPC Hits•Detector effects apparent

dE/dx•Colorful to exhibit particle statistics

•Tightening nSigma cuts to select particles

•Particles selected for combinatorics

μDST Analysis Invariant Mass

μDST Analysis Invariant Mass Dalitz Plot

Goals STAR

• Get more statistics.• Work on simultaneous/exponential fit for invariant mass to subtract background to look for λc

+.• Try swapping the sign on the π+ to find π-

K- p triplets as the background• Begin to explore Time Of Flight detectors.

CMS• CMS software for next summer.