# Presentation: 242692

## Barrel EMC and SMDStatus Tables

- Oleksandr Grebenyuk, NIKHEF

## Outline

- Tower status determination criteria
- Result – set of tower status tables(2003 d-Au and p-p runs)
- SMD strip status determination criteria
- Result – set of SMD status tables(2003 d-Au run)
- Tower status for 2004 Au-Au 62GeV run
- Tower status for 2004 p-p run
- Summary

## BEMC Tower Status Criteria

-  Pedestal shape (σ, position, height)
-  Number of signal hits / event above PED+**6****σ**

- Threshold for signal fraction calculation:
**6****σ** above pedestal

- Good tower ADC spectrum (5K d-Au events)

- Pedestal peak
- + Gaussian fit

**ADC**

## Pedestal shape

- No pedestal

- Pedestal is too broad**σ**** ****> 3**

- BEMC Tower Status Criteria

- d-Au

**ADC**

**ADC**

## BEMC Tower Status Criteria

**0.001** < signal fraction < **0.03** for **d-Au**
**0.00015** < signal fraction < **0.01** for **p-p**

- Example:No signal, pedestal only

- d-Au

**0.001**

**ADC**

## BEMC Tower Status – 2003 d-Au

- Bad towers:
- 240 (**10%**)

## BEMC Tower Status – 2003 p-p

- Bad towers:
- 453 (**19%**)

## BSMD Strip Status Criteriafor 2003 d-Au (by Martijn Russcher)

- Pedestal shape (σ, position)
- Signal fraction: above PED+**20 **or PED+**4****σ**

- Good strip ADC spectrum, 25K d-Au events

**ADC**

## BSMD Strip Status Criteria

- Pedestal shape

- Pedestal is too broad **σ**** > 5**

- Negative pedestal
- not always a problem

- No pedestalmany zeroes

**ADC**

**ADC**

**ADC**

## BSMD Strip Status Criteria

- Signal fraction

- Number of hits / event above PED+**20 **or PED+**4****σ** if σ>5Fixed threshold used to make it flat in η while σ changes

**0.0002** < signal fraction < **0.005**

- No signal, pedestal only

**ADC**

## BSMD-eta Strip Status – 2003 d-Au

- Colour-coded status, bad when >3
- White: data not analysed

- Bad strips:
- 1400 (**16%**)

## BSMD-phi Strip Status – 2003 d-Au

- Colour-coded status, bad when >3
- White: data not analysed

- Bad strips:
- 900 (**10%**)

## 2004 Au-Au 62GeV RunTower Status

- By Thorsten Kolleger:
-  - Similar set of quality checks
-  - 8.4% of bad towers
-  - BEMC was quite stable (within 0.1%)

## 2004 p-p RunTower Status

- By David Relyea:
-  - Similar set of quality checks
-  - Small fraction of data analysed
-  - 15-20% of bad towers

## Summary

- Tower status tables produced
- 2003 d-Au and p-p
- 2004 Au-Au 62GeV and p-p
- SMD status tables produced
- 2003 d-Au
- 2003 d-Au tower and SMD status tables were checked in π0 analysis (both real data and MC simulation) and put into DB

## The End

## Module front view

## BEMC Tower Status – d-Au

- Some cleanup:
- No signal at a certain run  good at that run
- Signal fraction ~ threshold  cold all the time
- Bad > 20% of time  bad all the time
- No signal > 50% of time  cold all the time
- + 120 bad towers from 2003 LED test(Stephen T., Alex St.)

## BEMC Tower Status Tables

- 2003 d-Au:
- 48 tables / 84 days: exact detector status
- 1 table for d-Au: ~0.5% acceptance uncertainty
- 2003 p-p:
- 100 tables / 67 days: exact detector status
- 1 table for p-p: ~1.5% acceptance uncertainty

- Status table: array of status codes (one per tower) with timestampused in reconstruction, simulation and efficiency/acceptance calculations

## BSMD-eta 

- PED+20 vs. PED+4σ

**η**

**η**

**η**

## BSMD-phi

- PED+20 vs. PED+4σ

## π0 analysis with 2003 d-Au status tables

-  - Improvement in the π0 invariant mass spectrum
-  - MC simulation gives 76% detector acceptance

- Inv. mass spectrum with default status tables

- With these tables