# Presentation: 049589

## POST-SHUTDOWN-DATA

**Offline EM, MET Distributions**
**THANKS to **
**Jan Stark, **
**Sophie Trincaz-Duvoid, Patrice Verdier**

## post-shutdown runs

-  **24 Nov: ****	****run 185576 ******** BLS power-plug problem**
-  25/26 Nov: 	run 185746
-  		run 185747
-  		run 185748
-  		run 185750
-  		run 185751
- 		--------------------
-  27 Nov: 	run 185797
- 		--------------------
-  28 Nov: 	run 185825
-  		run 185829
-  		run 185831
- luminosity estimation 485 nb-1=  77 nb-1+ 46 nb-1 + 362 nb-1
- processed with p14.05.02
- check of calorimeter performance with
-  electrons  (Jan Stark - Grenoble)
-  missing-Et (Sophie Trincaz-Duvoid – Paris, Patrice Verdier - Orsay)

## pre-shutdown: using em-candidates 

**J. Gardner**

******/******** distribution of all candidate EM objects id=|10,11|:**
**  ****p****T**** > 25 GeV ****(15 GeV post)**
**  ****EM fraction > 0.9**
**  ****isolation < 0.15**
**  ****HMx8 < 20**
**  ****in fiducial region**
**pink boxes: tower two problem\**
**blue boxes: energy sharing problem**
**green boxes: cable swap**
**red boxes: not understood**

**Electron candidates, with their small size  in ********/******** have proven to be a valuable tool to spot BLS problems in the calorimeter.**

**pre-shutdown: using em-candidates **

## Run 185576: BLS-power plug

- detector eta

- detector phi

**Statistical analysis of **
**em-candidates**
_**Black dots: **_
**  ****electron candidates**
_**Dashed green lines:**_
**  ****blocks of 2x2 towers**
_**Colours:**_** approximate probability that we are seeing a deficit of candidates in a given tower.**
**white or ****cold colours ******** low probability**
**warm colours ******** high probability**

**Loose BLS power plug. **
**Fixed now !**

**Run 185576: BLS-power plug**

**J. Stark**

## em-objects/em-candidates

**spatial distribution of em-objects:**
-  pT>10GeV
-  high occupancy in CC at 45<iphi<64

** ****not observed when requiring id=|10,11|**
** ****id-criteria for calorimeter-based em-selection**
** ****without id requirement track based em-selection included**
** ****CFT-mapping error!**

**J. Stark**

**M. Eads**

## statistical analysis of em's

**runs:**
**185750**
**185751**
**185797**
**185825**
**185829**
**185831**
**L=362nb****-1**
**~ 39 k ems**

- 	checkerboard structure in pre-shutdown

- dots for ems
- colors for **"deficit probability":** taking into account eta-dependence of expected occupancy

**overall reasonable!**

**J. Stark**

- detector phi

## high deficit regions

- only towers with  a **deficit probability > 0.998**
-  17 towers observed
-  7 towers expected from statistical fluctuations
** ****2 explained by "tower 2 problem"**
** ****8 towers un-explained!  **...which ones?

**"tower 2 problem"**

**J. Stark**

## "Tower 2" problems

**Tower 2 problem of BLS boards:**
-  correlation between odd/even towers on one BLS-board
-  checked for all 1152 boards
-  confirmed by pulser runs
-  fixed

**J. Stark**

## pre/post comparison

**Trigger: E1/2/3_2SH8 **
**Blue histogram: **
**2.8 pb****-1**** of good runs taken right before the shutdown.**
**Red points:  362nb****-1**** after shutdown**
** ****normalisation according to**
**integrated luminosity **
** ****not to the same surface !**

**p****T**

**phi**

**eta**

- GeV

**pre/post comparison**

**J. Stark**

## pre/post comparison

**pre/post comparison**

-  basic kinematical distributions and estimators are compatible with pre-shutdown data
-  event-rate looks fine

**em-frac**

**hmx8**

**J. Stark**

## Ze+e- comparison

- selection: no fiducial region requirement

**362 nb****-1**** post-shutdown data**

**2.8 pb****-1****  "late" pre-shutdown data**

**Z********e****+****e****-**** comparison**

- likelihood fit with voigtian-distribution: natural width (from pdg) doesn't appear in resolution (5.4 ±1.1%  vs. 3.9 ± 0.5%)
**signal events: 63.7 ± 9.4**  38.2 ± 3.9 events expected from old data
- resolution high by ~1******, **yield high by ~2****

**J. Stark**

## MET comparisons

**Data Samples**
-  pre-shutdown : 111 runs processed with p14.03.02
- runs 180040 180956 -14712 lumi blocks
-  post-shutdown : 9 runs processed with p14.05.02
- 		runs 185746  185831 - 986 lumi blocks
**- apply luminosity block selection : **
** ****number of events > 500 **
** ****SHIFT-METbxy = ******** (****METbx ****2**** + ****METby**** ****2****)  < 4 GeV                                               **
** ****RMS-METbxy   = ******** (****-METbx****2 ****+ ****-METby****2****)  < 22  GeV                                     **
** ****SETb**>** 80 GeV                                                                    **
- After selection, keep :
-    14200 (96,5 %) lumi blocks for pre-shutdown data (~31.8 Mevts)
-    929 (94,2 %) lumi blocks for post-shutdown data (~2.0 Mevts)

## METBx vs. lumi-block

**METBx vs. lumi-block**

- runs 185825, 185829,185831 have a different MET behavior (in red on next plots)

-  For each lumi block: compute   and  of METBx, METBy, METB, SETB
-  no trigger selection, no T42
-  Note that the vertical scale is different!

- This range (180520<run<180540) has ~same stat and ~same aspect than post-shutdown data. It is used for more detailed comparisons

**prescales >10E30**

**prescales <10E30**

**S. Trincaz**

## T42: pre-shutdown - Metx

**T42: pre-shutdown - Metx**

**Side-remark: T42 helps to reduce fluctuations in Met x/y !**

**Met-xy Shift same data with T42**

**One entry= 1 file or 20 lumi blocks**

**G. Bernardi**

## METBx

**Pre-shutdown**

## METBx: compatible Runs

- <METBx>

- <> -0.05

- RMS METBx

- <> 8.47

**Pre-shutdown – **Runs 180520-180540

**Post-shutdown**

**S. Trincaz**

## METBy

**Pre-shutdown**

**Post-shutdown**

**S. Trincaz**

- shifted

## JETS

- Structure in Jet eta/phi distribution already present in pre-shutdown data ("Yuri's Jet")
- vanishes after jet-id cuts
- under study to find criteria that cleans up the distributions and may give hint of the origine of these jets

**M. Eads**

**ALL jets**

**Leading jets**

## Summary

-  electron analysis:
-  understand remaining bad towers
-  monitor Z-peak behavior
-  we have to better understand the resolution anyhow
-  get hold of low energy electrons once tracking is fixed
-  MET:
-  understand MET-fluctuations – T42, trigger selections
-  shift in METy to be tracked down
-  JET
-  investigation for "Yuri's Jets"