# Presentation: 948077

##  Non-SUSY Exotics Searches  at the Tevatron 

**Sasha Pronko**
- Fermilab
- For CDF and DØ Collaborations

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Overview

**In this talk**
**Emphasize of new results since summer 07 based on           ***********L ************ *****1 fb****-1**** of data**
**Model-inspired**
**Theory driven**
**Model-dependent optimization of event selection**
**Set limits on model parameters**
**Signature-based**
**Signature driven**
**Optimize selection to reduce backgrounds**
**Event count; event kinematics**

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Tevatron in Run II

**36********36 bunches**
**Collisions every 396 ns**
**Two experiments: CDF & DØ**

**Proton-antiproton collisions at ********s=1.96 TeV**
**Delivered luminosity**
**Current: 3.7 fb****-1**** per experiment**
**Goal by 2009: 5-8 fb****-1**** **

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## CDF and DØ Experiments

**Multipurpose detectors ******** classic design**
**“****silicon”, central tracker, solenoid, calorimeter, muon chambers**
**Operating well: 80-90% efficiency**** **
**Broad physics program**
**QCD, EWK, top, B-physics, Higgs searches, searches for new physics**

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Search for High Mass e+e- Resonance 

**Many models with di-lepton resonances**
**E****6**** Z’s **
**RS graviton**
**Analysis overview**
**2.5 fb****-1 ****(largest dataset!!)**
**CC (|********1,2****|<1) or CF (|********|<2) e****+****e- pair with E****T****>25 GeV**
**Search region: 150-1000 GeV/c****2**
**Dominant background is Drell-Yan**
**Results**
**3.8******** excess in window M(e****+****e****-****)~240 GeV/c****2**** **

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Search for High Mass e+e- Resonance

**Set mass limits on RS graviton and Z’s from E****6**
**World best limits **

**M****G****>907 GeV/c****2**
**for k/M****Pl****=0.01**

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Search for High Mass Di-jet Resonances 

**Many Models with new particles decaying into di-jets**
**Axigluons, exited quarks, color octet technirhos, W’/Z’, di-quarks in E****6****, RS gravitons, etc.**
**Analysis at a glance**
**1.1 fb****-1****; N****jet********2; |y|<1.0; M****jj****>180 GeV/c****2**
**Fit mass spectrum by smooth function **
**test with Herwig, Pythia, and NLOJET++ **
**look for excess over fit function**

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Search for High Mass Di-jet Resonances

**No excess observed**
**Set 95% CL limits**
**World best limits**

| Observed mass exclusion | Model |
| --- | --- |
| 260-870 GeV/c2 | Excited quark |
| 260-1110 GeV/c2 | Color-octet technirho |
| 260-1250 GeV/c2 | Axigluon & coloron |
| 260-630 GeV/c2 | E6 diquark |
| 260-840 GeV/c2 | W’ (SM couplings) |
| 260-740 GeV/c2 | Z’ (SM couplings) |

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Anomalous Production of Exclusive +MET

**Motivation**
**Rare signature in SM**
**ISR photon can be                     only trace of exotic               process**** **
**Analysis**
- 2 fb-1; ||<1.0; ET() & MET>50 GeV; no jet with ET>15 GeV; no trk with PT>10 GeV; in time; 3 low PT tracks

**Optimize for LED:**
**E****T****(pho)>90 GeV**
**Combination of **
**jet+MET & ********+MET**

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Anomalous Production of +MET

******+MET+X signature in many models**
**Just a few examples:**
**Rare ********+X events at Tevatron**
**Infamous CDF Run I “ee********+MET” event**
**Dominant SM: ****WW******** ******** 8********10****-7**** events**
**Total: ****~10****-6**** events**
**CDF & D0 Run II “e********+MET” event**

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Anomalous Production of +MET

**Analysis overview**
- 2 fb-1; |1,2|<1.0; ET(1,2)>13 GeV
- Data driven background estimate
- Met Resolution Model to predict fake MET & select events based on MET-significance
- Two control regions
- Ze+e-; non-ISO 

|  | MetSig>3.0 | MetSig>4.0 | MetSig>5.0 |
| --- | --- | --- | --- |
| Non-collision | 0.90  0.32  | 0.85  0.30  | 0.80  0.27  |
| QCD (fake MET) | 52.1  11.5  | 15.4  3.8  | 6.2  2.7  |
| EWK (real MET) | 53.6  8.9  | 47.3  8.0  | 41.6  7.0  |
| Total | 106.6  14.5 | 63.6  8.9 | 48.6  7.5  |
| Observed | 120 | 52 | 34 |

**MET-significance**

- MET-significance is evaluated based on jet & un-clustered energy resolution
- Sig>1: 10.0% level
- Sig>2:   1.0% level
- Sig>3:   0.1% level

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Anomalous Production of +MET

**Example on efficiency of MET-significance cut**

| Efficiency for We | MetSig>3.0 | MetSig>4.0 | MetSig>5.0 |
| --- | --- | --- | --- |
|  | 84% | 79% | 72% |

**MET-significance>5 removes almost all QCD (fake MET)**

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Anomalous Production of jj+MET

**Signature of many models**
**MSSM (R-parity conserved)**
**Leptoquark models**
**UED (K-parity conserved)**
**Littlest Higgs models (T-parity conserved) **

**Analysis overview (2 fb****-1****)**
**Signature-based search**
**N****jet****(E****T****>15 GeV)=2; 0.05<|********|<2.4;**
**E****T****(jet2)>30 GeV; MET-cleanup cuts**
**Two kinematic regions:**
**H****T****=E****T****(jet1)+E****T****(jet2)>125 GeV; MET>80 GeV**
**H****T****=E****T****(jet1)+E****T****(jet2)>225 GeV; MET>100 GeV**
**Data driven background estimate**

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Anomalous Production of jj+MET

**Data agrees with predicted background**
**Limits on models are coming soon**

|  | HT>125 GeV; MET>80 GeV | HT>225 GeV; MET>100 GeV |
| --- | --- | --- |
| Total | 2312  140 | 196  29 |
| Observed | 2506 | 186 |

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Search for “Delayed” Z Bosons

**Long-lived particles decaying into Z**
**GMSB**
**Hidden valley models**
**Extended Higgs sector**
**4****th**** generation quarks**
**Analysis overview**
**1.1 fb****-1****; M****ee****>75 GeV/c****2****; two central EM objects**
**EM pointing to reconstruct decay vertex**

**Example of vertex reconstruction in (xy) using EM pointing**
**For b’ with M=160 GeV/c****2**** & c********=300 mm **

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Search for “Delayed” Z Bosons

**No excess in positive R****xy**** is observed**
**Set limit on b’ mass and lifetime**

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Search for H++H--++--

**Models with H++**
**Left-right symmetric models**
**Higgs triplet  **
**Little Higgs**** **
**Analysis Overview**
**1.1 fb****-1****; **
**3 ********’s with: P****T****>15 GeV/c; |********|<2.0**
**At least one ******** pair with: M>30 GeV/c****2****; ********<2.5 rad**
**Results**
**Background: 3.1********0.5**
**Data: 3 events**

- M(HL)>150 GeV
- M(HR)>126.5 GeV

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Search for H+X

**Fermiophobic Higgs**
**Top-color models**
**LED theories**
**MSSM **
**H********bb suppressed by 1-loop SUSY corrections**
**Analysis overview**
**1.1 fb****-1****; **
**2 ********’s with: E****T****>25 GeV; |********|<1.1; M********>65 GeV/c****2**
**Two regions**
**Signal: q****T****>35 GeV**
**Control: q****T****<35 GeV**
**Background**
******, ********j, jj**

- Result:
- M(hf)>92 GeV/c2

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Search for 3rd Generation LQ

**Theories with LQ bosons**
**Grand unification**
**Technicolor**
**Compositeness**
**Properties of LQ’s**
**Spin-0,1**
**3 generations (FCNC not seen) **
**Q=2/3 or 4/3**
**Analysis overview**
**1.1 fb****-1****;**
**tau: visible P****T****>15 or 20 GeV;**
**2 jets: E****T****>25,20 GeV; |********|<2.6**
**Electron veto**
**M****T****(MET,********)<50 GeV**
**Two sub-samples**
**1 b-tag**
**2 b-tags**

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Summary

**CDF and DØ performed searches for signatures of New Physics beyond the Standard Model**
**SM still prevails**
**New techniques and signatures explored**
**3.8******** excess at M(e****+****e****-****)~240 GeV/c****2**** is observed by CDF in 2.5 fb-1**
**More data will answer a question whether this is a fluctuation or sign of something new   **
**With ~3.5 fb****-1**** on tape and 2-5 fb****-1**** still to come, expect more exciting results**

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Backup slides

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Anomalous Production of jj+MET

**Data agrees with predicted background**

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Anomalous Production of jj+MET

**Data driven background estimates**

| Background | HT>125 GeV; MET>80 GeV | HT>225 GeV; MET>100 GeV |
| --- | --- | --- |
| W+jets ljets | 1324  51 | 97  10 |
| Z+jets  +jets  | 777  49  | 71  12 |
| Z +jets  ll +jets | 29  4 | 2  0 |
| QCD | 49  30 | 9  9 |
|  + jets | 55  13 | 5  3 |
| top | 74  9 | 11  2 |
| non-collision | 4  4 | 1  1 |
| Total | 2312  140 | 196  29 |
| Observed | 2506 | 186 |

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Anomalous Production of +MET

**Z********e****+****e****-**** control region**
**86 GeV<M****Z****<97.5 GeV**
**Only statistical uncertainties on background prediction**

|  | MetSig>3 | MetSig>5 |
| --- | --- | --- |
| Z | 0.23±0.13 | 0.15±0.11 |
| ttbar | 1.45±0.08  | 1.40±0.08 |
| Z+ | 2.72±0.37  | 1.43±0.27 |
| WW | 2.97±0.07 | 2.57±0.06 |
| WZ | 5.44±0.04  | 4.97±0.04 |
| ZZ | 6.53±0.06  | 5.94±0.06 |
| Fake 
MET | 46.1±2.1
±10.0(syst)   | 4.0±0.6
±2.8(syst)   |
| Total  | 65.4±2.1  | 20.5±0.7 |
| Data | 61 | 16 |

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko

## Anomalous Production of +MET

**Non-ISO ******** control sample (~5% of real ********)**

|  | MetSig>3.0 | MetSig>4.0 | MetSig>5.0 |
| --- | --- | --- | --- |
| Non-collision | 1.29  0.47  | 1.20  0.43  | 0.85  0.38  |
| QCD 
(fake MET) | 61.3  16.5  | 15.6  5.1  | 4.2  3.5  |
| EWK 
(real MET) | 68.5  11.4  | 55.1  9.9  | 43.6  8.3  |
| Total | 131.1  20.1 | 71.9  11.1 | 48.7  9.0  |
| Data | 126 | 63 | 41 |

- XXII Recontres de Physique de la Vallee d'Aoste, 2008

- Sasha Pronko