# Presentation: 242708

## EMC Software and analysis update

**Update on EMC**
**News from last run**
**Calibrations**
**Status of data analysis**
**Software update**
**Offline software**
**Online software**
**Task list and service work**

## What worked during the last run

**Towers**
**About 100/2400 dead or noisy**
**1 bad digitizer board (32) channels (replaced)**
**68 noisy/dead channels**
**HV is set to zero for all of them**
**SMD**
**3/60 modules not working**
**Some individual channels**
**Some we know are dead**
**Zero pedestal and no readout**
**Some are noisy**

## Bad runs/days

**About 138 bad runs**
**Thanks to Weijiang Dong**
**List at ****~suaide/badruns/2003.h**

**Weijiang Dong**

## Noise

**There is a correlated noise between towers very common to calorimeters**

**Pedestal distribution has a width ob ~25 GeV that can be easly reduced to ~5-6 GeV using standard comon noise subtraction methods**
**The Energy dynamic range of EMC is 2400 towers*60 GeV = 144 TeV**
**Noise at 1:10****4**** level**

**S. Trentalange**

## BEMC Calibration 

**Detector is calibrated using MIP peak method**
**Electron calibration is under way**

## ET measurement in Au+Au collisions

**Paper (PRC) being reviewed in the high-p****T**** PWG**

**M. M. de Moura**

## Electron identification in d+Au

**Use TPC dE/dX to pre-select electrons in the range of 1.5 < p < 5.0 GeV/c (can extend a little more)**
**Compare TPC momentum with tower energy (p/E****tower****)**

**p/E****tower**

**p/E****tower**

**distance**

**Distance < 0.015**

## Comparison with Au+Au

**Comparison with Au+Au**

**Electron peak is wider than Au+Au**
**Lower multiplicity in d+Au makes tower equalization more difficult -> working on it**
**Current tower resolution ~ 21%/sqrt(E)**

- d+Au

**p/E****tower**

## The SMD can enhance e/h discrimination

**SMD can help to discriminate electrons from hadrons**
**Most of hadrons do not have SMD clusters**
**The distance between SMD and track has different distributions**

## Preliminary single electron spectra for d+Au collisions

**Preliminary single electron spectra for d+Au collisions**

**950 k ****High-tower ****events**
**No corrections applied**
**Trigger bias**
**Efficiency**
**background **
**Momentum resolution, etc**
**Need to tune up electron identification with EMC**

- HT1

- HT2

## 0 mass reconstruction in d+Au

**S. Trentalange**
**and S. Guertin**

## 0 reconstruction in d+Au – SMD information

**SMD is used to get the photon position**
**Need to understand efficiencies**
**Look how many EMC points at given energy have SMD info on it**
**Efficiency drops at lower energies because SMD thresholds are very high at reconstruction software**
**Need tune up**

**S. Trentalange**
**and S. Guertin**

## 0 spectrum in d+Au 

**Much work to be done**
**Efficiency corrections (embedding)**
**Cluster thresholds**
**This may have huge difference at high-pt because of the very small opening angle between photons**

- Preliminary

**S. Trentalange**
**and S. Guertin**

## High tower azimuthal correlations

**Most of high tower triggered events with no tracks pointing to the tower come from ********0**** ́s**
**HT-track correlations and HT-HT correlations is a good way to study ********0****-track and ********0****-********0**** correlations**
**It is possible to go very high in p****T**** because of trigger**
**Very preliminary work. Need to compare to minimum bias**

**S. Chattopadhyay, S. Voloshin**
**and A. Suaide**

**track**

- pT

## EMC Software status

**Offline reconstruction chain is fully implemented**

## EMC Database

**Calibration and pedestals are filled in the database**
**Only MIP calibration for a while**
**Pedestals were saved every 12 hours during beam time**
**Status tables**
**Only one table with the bad towers/SMD channels in the beggining of the run**
**Bad runs at ~suaide/badruns/2003.h**

## EMC simulations and embedding

**Slow simulator ****(PLEASE USE ONLY Y2003a GEOMETRY)**
**Real gains, pedestal and map of dead channels from database**
**Geometry propagation to .geant.root -> Is there any hope???**
**Embedding (2 steps)**
**TPC embedding**
**EMC embedding**

## Online software – preparation for next run

**Online calibration and pedestal measurement**
**Software is ready – Pedestal measurement, tower equalization and MIP calibration with L3 tracks**
**Need to tune up parameters **
**Multiplicity cuts, time interval for pedestal calculation**
**Event display**
**Ready to go**
**Online monitoring**
**EMC Monitoring – ready**
**STAR online monitoring (Panitkin’s) – ready**
**Need to check for possible changes in the trigger map and event pool library**

## Software summary – task list and service work

**Simulations**
**Trigger simulator ****(very high priority)**
**Implementation of current High Tower and Patch algorithms **
**Signed but nothing has been done. NEED PEOPLE???**
**Slow simulator ****(moderate priority)**
**Include simulation of correlated noise**
**Signed but nothing has been done. NEED PEOPLE???**
**Embedding**
**Turn on EMC real data processing ****(very high priority)**
**Signed. Small problem with timestamp. Working on a solution**
**Test StEmcMixerMaker ****(very high priority)**
**DONE with simulation alone.**** ****Need to wait for previous item to be fixed **

## Software summary – task list and service work (cont.)

**Calibration**
**Electron calibration ****(very high priority)**
**Under way****. Working on better tower equalization**
**SMD calibration**
**NEED PEOPLE HERE**
**Database**
**Status tables ****(extremely high priority)**
**Map dead/bad towers and SMD channels**
**Time dependence of bad channels**
**NEED PEOPLE HERE**
**Online Software **
**Check software for next run ****(moderate priority)**
**Recompile with newer libraries**
**Check for possible changes in the event pool library and possible changes in the trigger maps**
**NEED PEOPLE HERE**

## Final comments

**Data analysis is progressing very well (QM2004????)**
**E****T**** paper being reviewed in the high-p****T**** PWG**
**Single electron spectrum**
** ********0**** spectrum and correlations **
**Software development**
**All pieces in place**
**Task list**
**Offline -> Simulations, embedding, map dead channels, etc.**
**Online -> Need to prepare for next run**
**NEED VOLUNTEERS**** THAT ARE REALLY COMMITED TO HELP**