# Presentation: 491011

## An Estimate of the Number of Hits we expect to see in the Muon System 

- Victoria Rojo
- Vivek Jain
- 06-05-06

## (Currently MOORE doesn’t use the eta hits in the Trigger chambers)

| Station
Name | 
# of eta hits

Precision and Trigger |  | # of phi hits
 | Station
Name
 | .
# of eta hits

Precision and Trigger |  | # of phi hits | Station
Name | 
# of eta hits

Precision and Trigger |  | # of phi hits
 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| BIL | 8 | 0 | 0 | BOG | 6 | 2 | 2 | T2F | 0 | 2 | 2 |
| BIS | 8 | 0 | 0 | BOH | Doesn’t exist? | Doesn’t exist? |  | T2E | 0 | 2 | 2 |
| BML | 6 | 4 | 4 | EIL | 8 | 0 | 0 | T3F | 0 | 2 | 2 |
| BMS | 6 | 4 | 4 | EEL* | 6 | 0 | 0 | T3E | 0 | 2 | 2 |
| BOL | 6 | 2 | 2 | EES* | 6 | 0 | 0 | T4F | 0 | 0 | 2 |
| BOS | 6 | 2 | 2 | EML | 6 | 0 | 0 | T4E | 0 | 0 | 2 |
| BEE | 4 | 0 | 4 | EMS | 6 | 0 | 0 | EIS | 8 | 0 | 0 |
| BIR | 8 | 0 | 0 | EOL | 6 | 0 | 0 | CSS | 4 | 0 | 4 |
| BMF | 6 | 0 | 0 | EOS | 6 | 0 | 0 | CSL | 4 | 0 | 4 |
| BOF | 6 | 2 | 2 | T1F | 0 | 3 | 2 | BIM | 8 | 0 | 0 |
|  |  |  |  | T1E | 0 | 3 | 2 |  |  |  |  |

- * The EEL and EES are not currently installed

## In the following slides we show: 

- The number of precision hits (as function of phi) MOORE gives us for different eta regions. We compare the hits as given by the etahmo and mdthmo variables. The etahmo variable agrees with the values in Table 1. For a description of which detectors exist in each eta region, consult MuonSpectrometer_nomenclature_Version2.ppt or the mTDR.
- The number of phi hits (as a function of phi) MOORE gives us for different eta regions. Here we have used the phihmo variable. Due to problems combining pointing TGC phi strips with non-pointing CSC phi strips the number of phi hits MOORE gives us is slightly less than we would expect for the 1.95 < |eta| < 2.4. In this eta region, based on our table, we would expect 10 hits. Looking at slide 19, we do see a band at 10 hits but the one at 7 hits is more predominant. This also affects, to a lesser extent perhaps, the phi hits seen in 2.4 < |eta| < 2.7.
- For information on the MOORE ntuple variables: https://uimon.cern.ch/twiki/bin/view/Atlas/MooreNtuple.

## Precision Hits Vs Phi

- etahmo

- mdthmo

## Precision Hits Vs Phi

- etahmo

- mdthmo

## Phi hits Vs Phi

- phihmo

## A few notes on how we arrived at the numbers in table 1:

- BIL :    MDT  2 lyrs x 4 tubes = 8 hits
- 	      RPC  0
- BIS :   MDT  2 lyrs x 4 tubes = 8 hits (except for sector 8)  1 lyr x 4 tubes = 4 eta hits
- 	      RPC  0
- BML :  MDT  2 lyrs x 3 tubes = 6 hits
- 	      RPC  2 RPC x 2 lyrs x 1 phi hit per layer = 4 phi hits
- 	      RPC  2 RPC x 2 lyrs x 1 eta hit per layer = 4 eta hits
- BMS :  MDT  2 lyrs x 3 tubes = 6 hits
- 	      RPC  2 RPC x 2 lyrs x 1 hit per layer = 4 phi hits
- 	      RPC  2 RPC x 2 lyrs x 1 eta hit per layer = 4 eta hits
- BOL :  MDT  2 lyrs x 3 tubes = 6 hits
- 	      RPC  1 RPC x 2 lyrs x 1 phi hit per layer = 2 phi hits
- 	      RPC  1 RPC x 2 lyrs x 1 eta hit per layer = 2 eta hits
- BOS :  MDT  2 lyrs x 3 tubes = 6 hits
- 	      RPC  1 RPC x 2 lyrs x 1 phi hit per layer = 2 phi hits
- 	      RPC  1 RPC x 2 lyrs x 1 eta hit per layer = 2 eta hits
- BEE:    MDT  1 lyrs x 4 tubes = 4 hits
- BOH :

## BIR :   MDT  2 lyrs x 4 tubes = 8 hits

- BMF :  MDT  2 lyrs x 3 tubes = 6 hits
- BOF :  MDT  2 lyrs x 3 tubes = 6 hits
- 	       RPC  1 RPC x 2 lyrs x 1 phi hit per layer = 2 phi hits
- 	        RPC  1 RPC x 2 lyrs x 1 eta hit per layer = 2 eta hits
- BOG :  MDT  2 lyrs x 3 tubes = 6 hits
- 	        RPC  1 RPC x 2 lyrs x 1 phi hit per layer = 2 phi hits
- 	        RPC  1 RPC x 2 lyrs x 1 eta hit per layer = 2 eta hits
- EIL :   MDT  2 lyrs x 4 tubes = 8 hits
- EEL :  MDT  2 lyrs x 3 tubes = 6 hits
- EES :  MDT  2 lyrs x 3 tubes = 6 hits
- EML : MDT  2 lyrs x 3 tubes = 6 hits
- EMS : MDT  2 lyrs x 3 tubes = 6 hits
- EOL : MDT  2 lyrs x 3 tubes = 6 hits
- EOS : MDT  2 lyrs x 3 tubes = 6 hits

## T1F: TGC 1 triplet (middle station) : 3 precision hits and 2 phi hits  

- T1E: TGC 1 triplet (middle station) : 3 precision hits and 2 phi hits
- T2F: TGC 1 doublet (middle station): 2 precision hits and 2 phi hits
- T2E: TGC 1 doublet (middle station): 2 precision hits and 2 phi hits
- T3F: TGC 1 doublet (middle station): 2 precision hits and 2 phi hits
- T3E: TGC 1 doublet (middle station): 2 precision hits and 2 phi hits
- T4F: TGC  1 doublet (inner station, only measures phi) : 2 phi hits
- T4E: TGC  1 doublet (inner station, only measures phi) : 2 phi hits
- EIS: MDT  2 lyrs x 4 tubes = 8 hits
- CSS: CSC 4gas gaps x 1 eta hit = 4 eta hits
- 	     CSC 4gas gaps x 1 phi hit = 4 phi hits
- CSL: CSC 4gas gaps x 1 eta hit = 4 eta hits
- 	     CSC 4gas gaps x 1 phi hit = 4 phi hits
- BIM: MDT  2 lyrs x 4 tubes = 8 hits

## Other Notes:

- 1. MDT info for B** : “layout” from mTDR pg 82
- 2. MDT info for E** and F**: “layout” from mTDR pg 90
- 3. RPC info for B**: “layout” from mTDR pg 96  ex: B1L was interpreted as being the first large RPC from the center of the detector (in the BML station), B2L the second RPC from the center (also in the BML), B3L the third RPC from the center (in the BOL) etc...
- 	Each RPC in a given station was considered to consist of 2 detector layers, each layer capable of registering 1 phi hit and 1 eta hit.
- 	The number of RPC’s in each station was determined via the detector diagram in the mTDR pg 68: inner layers have no RPC’s, middle layers have 2 RPC’s, outer layers have 1 RPC.
- 4. BOH detectors were assumed not to exist.
- 5. Information about the TGC taken from mTDR overview page 19 and diagram on page 97 (figure 4-30).
- 6. The T1E, T2E, and T3E stations are divided in substations at different theta angles (i.e. T1E  T1E1, T1E2, T1E3, and T1E4). All the substations are identical in the number of hits they receive so the number of hits for each substation is the same as the number provided for the station.