# Presentation: 361011

## Run 8 pC results

*Vipuli **Dharmawardane** (NMSU)*
*RSC meeting*
*Sep 12**th** 2008*

## Run Selection

- Same quality checks as run 05 and 06

- Carbon mass position deviation : < 0.5 GeV from the Carbon mass
- Carbon mass width : deviation below 1.9 sigmas
- Number of events in banana :  strips inside 20% from the average
- Fill #s: _9942_, 9947, _9948_ problems with pC data → Borrow results from HJet

## Run Selection

- Energy correction

## Polarization Profile

- A fit to P Vs L/Lmax to determine Pmax and sL/sP

- HJet

## Polarization Profile

- A fit to P Vs L/Lmax to determine Pmax and sL/sP

- HJet

## Polarization Profile 

- RUN08
- F0 was kept fixed at average F0

- Polarization for  each target position is determined by doing a sin phi fit to asymmetry Vs phi measured at  each target position

## Polarization Profile 

- RUN08
- F0 was kept fixed at average F0

- F0 YELLOW

- F0 BLUE

## Polarization Profile : YELLOW

- HORIZONTAL SCANS

## Polarization Profile : BLUE

- VERTICAL SCANS

- HORIZONTAL  SCANS

## Polarization  profile: consistency checks

- Average over all
- scan  positions

## Polarization decay

- Fill 9880

- Both linear and exponential fits to Polarization for each fill
- Assume the functional form

- Average Polarization

- Assumed aL = 15 hrs

## Polarization decay

- Tdecay ≈ 90 hrs

- Tdecay ≈ 370 hrs

- BLUE

- YELLOW

## Polarization decay

- Tdecay ≈ 90 hrs

- Tdecay ≈ 370 hrs

- BLUE

- YELLOW

- Yellow beam shows a faster polarization decay
- Difference between the average polarization calculated assuming  no decay  and  exponential decay is consistent with zero

## NORMALIZATION TO HJET

|  PERIOD | pC average | pC/HJet |
| --- | --- | --- |
| All | 39.59± 0.39 | 1.091± 0.035 |
| 1 | 41.00 ±0.61 | 1.045± 0.054 |
| 2 | 38.16± 0.73 | 1.124± 0.069 |
| 3 | 39.55± 0.69 | 1.110± 0.062 |

| PERIOD | pC average | pC/HJet |
| --- | --- | --- |
| ALL | 47.96 ±0.53 | 1.062± 0.029 |
| 1 | 52.02± 0.65 | 1.086± 0.055 |
| 3 | 47.02± 0.74 | 1.090± 0.044 |
| 4 | 47.80± 1.38 | 0.982± 0.057 |

- Run 5   ≈  1.01     Run 6 ≈  1.15

- Golden runs
- 1.101±0.053
- OK runs
- 1.078±0.048
- Golden runs
- 1.086±0.082
- OK runs
- 1.051±0.031

## NORMALIZATION TO HJET

## Uncertainties due to polarization profile

-       _Same approach as run 6_
- Lmax determination  < 0.2%
-     Scan is not continuous → We may miss the maximum
- Target vibrations  (flat profiles) <1%
-      Simulations done by Sasha → Uncertainty is negligible
- Assumption that the profiles are Gaussian  < 0.5%
- R distributions for vertical/horizontal profile
-      ●Studied the variation in R
-      ●For Blue we have both vertical and horizontal scans
-      ●For Yellow we only have horizontal scans

- TOTAL < ≈ 1.1%

- RUN 8
- SPECIFIC

## Uncertainties due to polarization profile -Blue

**Vertical Scans **
**R →0.07-0.26**

**Horizontal Scans **
**R→0.04-0.24**

**On average**
** 0.15±0.11**

- R distribution

- dR distribution

- Global uncertainty is zero → R is known for  both vertical and  horizontal  scans

## Uncertainties due to polarization profile -Yellow

- No vertical scans for Yellow
- Assume 0-0.39 variation in  R
- Fill uncertainty and global uncertainty ≈ 5%

**Horizontal Scans **
**R→0.20-0.39**

- dR distribution

- R distribution

## Uncertainty due to Dead Layer

- Dead layer  variation
- within  ±4 mg/cm2
- Polarization ±2.5%

- Fill to fill uncertainty

- Dead layer  variation
- within  ±3 mg/cm2
- Polarization ±1.8%

- Fill uncertainty
- 1.6*0.6 ≈ 1%

- Fill uncertainty
- 1.1*0.6 ≈ 0.7%

##  Uncertainties : Summary 

-  Uncertainties : Summary

- _Fill to fill uncertainties_
- Horizontal/Vertical profile                            3.0%           5.0%
- Energy correction/dead layer                        1.0%           0.7%
- _Global __uncertainties_
- Jet normalization (profile)                            1.1%          1.1%
- Pol. Profile (for experiments)                       0.0%          5.0%
- Energy correction/deal layer                         1.8%          2.5%

##  Online/Offline comparison 

-  Online/Offline comparison

- In case you are curious .....

## BACKUP SLIDES

## Run Selection

- Same quality checks as run 05 and 06

- Carbon mass position deviation : < 0.5 GeV from the Carbon mass
- Carbon mass width : deviation below 1.9 sigmas
- Number of events in banana :  strips inside 20% from the average

## Calibrations

**Calibrations**

**YELLOW**

**BLUE**

- Feb 13th constants for det 1,2,3,4 and 6
- Detector 5
- Upto Fill 9886 Feb 13th constants
- Feb 27th constants after Fill 9886

**Feb 16****th**** 2008 (Fill 9886)**

- Jump in Detector 5 current

- All runs

## Dead layer : YELLOW

## Dead layer : BLUE

## Rate dependence

- Dead layer rate dependence

- T0 rate dependence

## Polarization : BLUE

## Polarization  : YELLOW

## Polarization : YELLOW

## Polarization  : YELLOW

## Polarization  : YELLOW

## Online/Offline: BLUE

## Online/Offline: BLUE

## Online/Offline: YELLOW

## Online/Offline: YELLOW