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Measurement of non-photonic electrons in Cu+Cu 200 GeV collisions

Updated on Tue, 2008-06-17 02:14 by aknospe. Originally created by surrow on 2008-06-02 22:08.

High-energy nucleus-nucleus collisions at RHIC allow the study of the behavior of nuclear matter at high temperatures, where a new phase of matter, the quark-gluon plasma is predicted to exist.&nbs

Reference

Speaker : Anders Knospe ( Yale University )


Talk time : 16:05, Duration : 00:20
»

Resonance Correlations - Pilot Study

Updated on Mon, 2008-06-02 08:22. Originally created by lbarnby on 2008-06-02 08:22.

Reference

Speaker : Christina Markert


Talk time : 00:00, Duration : 00:15

Pilot study for hadron-resonance 2-particle correlation study using Lambda from mixed event technique.

Some useful scripts

Updated on Sat, 2008-05-31 16:18. Originally created by chajecki on 2008-05-31 14:31.

Here I will collect some scripts I wrote while playing with drupal. Most of them were written to automize moving the contant from old STAR db to drupal.

RHIC/AGS Workshop Talk

Updated on Fri, 2008-06-06 15:25. Originally created by jwebb on 2008-05-21 11:21.
 

I am giving a talk at the RHIC/AGS User's Meeting, in the spin workshop.  Three versions of the talk are attached.

 

Content Management system in STAR

Updated on Mon, 2008-05-19 10:57. Originally created by jeromel on 2008-05-19 10:24.

Introduction

This project started in 2005 as a service task aimed to provide a seamless port of the online Web server for document self-maintenance and easy access.

2005

Updated on Fri, 2008-10-03 14:01 by testadmin. Originally created by jeromel on 2008-05-19 10:01.

This page is a placeholder to import the projects launched in 2005.

 

Papers on phase-space effects on momentum observables

Updated on Sat, 2008-05-31 21:49. Originally created by chajecki on 2008-05-14 14:18.
  1. Enrico Fermi, High Energy Nuclear Events, Progress of Theoretical Physics 5 (1950) 570

Multi-core CPU era task force

Updated on Mon, 2008-05-12 16:06 by testadmin. Originally created by jeromel on 2008-05-12 15:24.

Introduction

On 7/12/2007 23:42, a task force was assembled to evaluate the future of the STAR software

placeholder

Updated on Thu, 2008-05-08 04:32. Originally created by tpb on 2008-05-08 02:37.
For later use.

Archive Viewer

Updated on Tue, 2011-01-18 11:26. Originally created by gorbunov on 2008-04-30 10:00.

 

Slow Controls Operations Manual

Updated on Wed, 2024-04-03 23:05 by tlusty. Originally created by gorbunov on 2008-04-29 18:07.

STAR

Slow Controls Operations Manual

X-Windows Remote Access to BNL with NX

Updated on Tue, 2011-01-18 11:44. Originally created by gorbunov on 2008-04-29 17:56.

This document based on http://request.nsls.bnl.gov/freenx/

Yury Gorbunov

Rejection rules

Updated on Fri, 2008-04-25 16:59 by testadmin. Originally created by jeromel on 2008-04-25 16:57.

The content of this page should NOT be visible to users outside of STAR.

Slow Control Archive

Updated on Thu, 2008-04-24 15:08. Originally created by jcs on 2008-04-24 15:06.

FTPC Slow Control Archives

 

Pythia estimates of gamma-jet yields

Updated on Mon, 2010-03-15 15:38. Originally created by sowinski on 2008-04-08 11:10.

Comparison of yields for gamma jet

STAR/RCF resource plans

Updated on Fri, 2008-08-22 10:28 by testadmin. Originally created by jeromel on 2008-04-03 11:42.

 

EEmc Gammas via conversion method, improving yield extraction using postshower information

Updated on Fri, 2008-06-06 15:23. Originally created by jwebb on 2008-03-28 14:56.
Abstract:  We have EEmc Gammas via conversion method, relaxing the hadronic veto cut identified a background contribution which appears consistent with neutral hadrons (or charged hadrons which slip through our cuts) initiating a hadronic shower w/in the calorimeter stack.  Such a neutral background is not accounted for in our estimate of the background efficiency.  Thus, the extraction method breaks down.  For this study, we use the postshower response to estimate the fraction of hadron-like vs photon-like backgrounds, and extract a more reliable single photon yield.
 
1.0 Description of the Method
 
Begin by applying the following cuts to the event sample

Cuts:

1. Require candidate to be w/in the EEMC with pT > 5.0 GeV.
2. Isolation cut -- ET / ETR<0.3 > 0.9
3. Charged particle veto -- require sum of all preshower-1 tiles w/in R < 0.3 to be == 0
4. Analyzing cut -- sum preshower-2 tiles w/in R < 0.3 is greater than zero (i.e. at least one tile w/ ADC > 3 sigma + ped
 
Plot the postshower-to-SMD energy ratio of these events.  We see a broad gaussian on top of a much broader background.  The gaussian "photonic" region occurs for relatively little energy in the postshower detector for relatively large SMD energy deposits.  This is the type of signature we expect for electromagetic showers.  It rides on top of a modest background of events, with a tail which extends to large energy deposits in the postshower with little energy showing up in the SMD.  The events in this "hadronic" region are consistent with hadronic showers occuring w/in the endcap.  We fit the distribution to the sum of two gaussians to estimate their relative contributions.
 
For the rest of this discussion, we define D = log(Epost/(Eu+Ev+delta)).
 
n.b. log is ln, i.e. natural logarithm.  As in TMath::Log() ... which of course is undocumented in the root reference guide, and one has to look at the code to find out.  Sheesh.
 
Figure 1 -- Fit to log(Epost/(Eu+Ev+delta)).  The fit is to the sum of two gaussians.  The fit chi2 (conviently left off of the plot) is somewhat poor... 79.47 per 29 dof.  However, this gives us a starting point to estimate the relative fractions of (a) single photons, (b) photonic backgrounds, and (c) hadronic backgrounds.
 

Proposed STAR HBT BUR for energy scan

Updated on Thu, 2008-03-20 14:09. Originally created by lisa on 2008-03-19 23:50.

Attached find a proposed BUR from STAR-HBT for the energy scan runs.  It is focused on azimuthally-sensitive HBT.  It has been updated 20 March 2008.

Low energy run first look

Updated on Wed, 2008-03-19 13:00 by testadmin. Originally created by jeromel on 2008-03-19 11:54.

Reference

Speaker : Lokesh Kumar ( Panjab )


Talk time : 12:35, Duration : 00:15

Discussion post-meeting

Common

Updated on Sat, 2023-07-29 14:16 by marr. Originally created by lbarnby on 2008-03-18 07:00.

STAR Physics Pages of Common Interest

Approval arrangement