# Presentation: 707107

## Status of High pT μ Trilepton Search

- Anadi & Else
- December 2005

## Overview

-  Looking for trilepton events in high pT muon data sample
-     Gen 5: 346 pb-1 or 318 pb-1 (Good Si for plug electrons)
- μμ+x blessed - but improvements for Spring, (see Anadi’s
- talk at ealier Purdue meeting), likely a few more
- Today: μe+x part, divided up in central and plug electrons
-            plus _extremely preliminary_ results with new data
- 	 (still trouble with access)
- All errors are statistical for MC and systematical for fakes

## Current Selection

- First object: always a high pT CMUP or CMX muon.
- 2nd: CMUP, CMX with pT  5 GeV
-        CMIO: pT  10 GeV
-        Central tight e: ET  8 GeV
-        Plug e:  5  ET  15 GeV
-        Phoenix e: ET  15 GeV
- 3rd:  As above, plus accepting
-        loose central electrons  5 GeV
-        Plug electrons for μ- plug e selection

- μμ selection

- μe selection

- Other criteria, cosmic-removal etc, please see note 7714
- For the ID: notes 7197, 7233, 7309, 7367 and their references.

## Lepton ID for Gen 6

-  High pt leptons and trigger blessed today (?)
-  Hope to have all ntuples for low pT ID studies beginning of
-   January
- 	 muon ID: us
- 	 electron ID: Rutgers
- 	 fake rate:  Beate
-  So far no significant change in scale factors gen5 and gen6
- (when same cut)
- New suggestions:
-  loosen CMU dx  - need to see fake rate
-  looser isolation? (dropped again at high pT)
- 	isol ETcorr /ET = (isol ET - 0.35*(Nvert-1)/ET

## Control Regions

|  |  |   |  |
| --- | --- | --- | --- |
|  |  |  |  |
|  |  |  |  |

## e Control Regions Gen 5

| Region | MC bg | Fake | DATA |
| --- | --- | --- | --- |
| A+E | 35.1±1.3 | 1.5±0.8 | 43 |
| G+I | 26.8±1.1 | 0.7±0.4 | 30 |
| A2+F | 5.1±0.2 | 0.3±0.1 | 5 |
| J+H | 0.2±0.07 | 0.08±0.04 | 0 |
| G+I (3l) | 1.3±0.2 | 0.007 | 3 |
| J+H (3l) | 0 | 0.0005 | 0 |

| MC bg | Fake | DATA |
| --- | --- | --- |
| 25.0±1.1 | 2.4 ±1.2 | 29 |
| 15.2±0.8 | 1.1 ±0.5 | 23 |
| 1.9±0.2 | 0.5 ±0.2 | 3 |
| 0.3±0.06 | 0.1 ±0.05 | 1 |
| 1.50±0.2 | 0.002 | 1 |
| 0.009±0.002 | 0.001 | 0 |

- High pT  + tight central e

- High pT  + plug/phoenix e

- (μμe)

## e Plots 1: Basics

-  + central e

- NOTE: This is ALL mu+electron events, no CR selection

- +plug e

## e Plots 2: Geometry

-  + central e

-  + plug e

- ?

## e Plots 3: MET etc

-  + central e

-  + plug e

## e Signal Regions

| μ+central e | SUSY | W(Z/)* | DY + | Fakes | tt | ZZ | S/B |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Trileptons | 0.46 | 0.34 | 0.80 | 0.33 | 0.008 | 0.009 | 0.4 |
| Mass veto | 0.44 | 0.10 | 0.47 | 0.09 | 0.008 | 0.001 | 0.5 |
| N jets < 2 | 0.44 | 0.10 | 0.47 | 0.022 | 0.008 | 0.001 | 0.6 |
| MET>15 GeV | 0.38 | 0.09 | 0.02 | 0.013 | 0.008 | 0.001 | 1.0 |

| μ+plug e | SUSY | W(Z/)* | DY + | Fakes | tt | ZZ | S/B |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Trileptons | 0.12 | 0.27 | 0.74 | 0.33 | 0.008 | 0.006 | 0.10 |
| Mass veto | 0.12 | 0.14 | 0.35 | 0.07 | 0.008 | 0.003 | 0.16 |
| N jets < 2 | 0.11 | 0.14 | 0.34 | 0.06 | 0.005 | 0.003 | 0.15 |
| MET>15 GeV | 0.10 | 0.13 | 0.016 | 0.05 | 0.004 | 0.003 | 0.22 |

## -TCE trileptons

- -TCE trileptons

- N-1 plots

- Composition of selected signal events:
- 	μμe: ~ 2/3
- 	μee: ~ 1/3
- Large overlap with μμ selection
- e+x analyses apply  cut:

## New data  - μe

- _Dec 2004 – October 2005_
- New tool from DQM group: 399pb-1 with v10 good runlist
-     362pb-1 with good Si
- Expectation is gen 5 fakes + MC background scaled to new luminosities
- 	 LARGE uncertainties on   numbers!

|  | Expected | Data | Expected | Data |
| --- | --- | --- | --- | --- |
| A+E | 43 | 53 | 29 | 37 |
| G+I | 32 | 27 | 17 | 24 |
| A2+F | 6 | 2 | 2.5 | 3 |
| J+H | 0.3 | 0 | 0.5 | 0 |
| G+I (3l) | 1.5 | 2 | 1.5 | 0 |
| J+H (3l) | 0.003 | 0 | 0.01 | 0 |

- Greatest new data challenge is getting to it!

## New data μμ

- Using Si runlist (362pb-1?)
- Comparing old and new data in Z peak &
-  scale new data to this
- All channels:
- _Problems in high MET regions _
- – need to know true luminosity of data sample!!!

|  | Old | New |
| --- | --- | --- |
| A | 95 | 99 |
| G | 1319 | 1284 |
| I | 7866 | 7693 |
| E | 204 | 253 |
| A2 | 14 | 16 |
| F | 29 | 34 |
| J | 96 | 104 |
| H | 28 | 25 |

## Conclusion

-  We are generally happy with gen 5 status, only
-     minor issues
-  Will most likely keep analysis cuts as is
-  New data: need to keep an eye on high MET regions
- 		  still shooting for Spring!
- _To do in January:_
-  Study and implement changes to ID cuts
-    (especially isolation) and the few new MC samples
-  Include the 25pb-1 cable swap period in CR’s and
-   hopefully signal region
-  Systematics

## Backup

## DY MC’s

- Using DY samples made with
- 5.3.3_ewk tarball
- Tuned axial hit resolution, min bias,
-  and track 2 fixed.
- _All MC’s consistent except in A and E_