# Presentation: 146440

##  D Results on New Phenomena (BSM) Searches 

**Subhendu Chakrabarti**
**DAPNIA CEA Saclay**
***On behalf of D************  collaboration***

**Lake Louise Winter Institute **
**	****18 -24 Feb.  2007 **

## Outline 

**Extra dimensional  Randall-Sundrum Graviton**
**New Heavy Charged Boson W’ **
**SUSY Trileptons **
**Squarks and Gluinos**
**GMSB SUSY in ******

**Various model dependent searches  exist  for New  Physics   (Beyond  Standard  Model)  at D******

**Only overview  of  a subset of most recent results are presented here ,  More results in,**
**http://www-d0.fnal.gov/Run2Physics/WWW/results/np.html**

- D0 Results on New Phenomena (BSM) Searches

- Subhendu Chakrabarti

##  Search for  Randall-Sundrum Graviton 

**     ****G******** e****+**** e****-  **** / G******** ******
**Search for two EM clusters, **
**      ****with P****T****>25 GeV and |********| <1.1**
**Data matches with SM Zee **
**     ****production and  QCD background,**
**      ****No excess!**
**Exclusion at 95% CL**
-        First RS excited resonance Graviton mass
- 	and dimensionless coupling constant
**    **

**M****1 ****<865 GeV for ****k****√****8********/Mpl =0.1**
**M****1**** <240 GeV for ****k****√****8********/Mpl =0.01**

- D0 Results on New Phenomena (BSM) Searches

- Subhendu Chakrabarti

## Search for New Heavy Charged Boson W’

**Electrons with E****T****>30 GeV and |********|<1.1**
**Ratio of E ****T****e/MET within (0.7-1.3) **
**If Jet P****T****>15 GeV in event, ********(j,MET/e)<2.5**
**MET>30 GeV**
**M****T****>150 GeV**
**data matches with SM background prediction**

**Mw` >965 GeV @ 95% CL**

***W` ************ e *********

**Event Selection**

- D0 Results on New Phenomena (BSM) Searches

- Subhendu Chakrabarti

## Search for SUSY Trileptons 

** ****Associated Chargino/Neutralino Production**
**Cleanest  channel in hadron colliders for SUSY search **

**Search for SUSY Trileptons **

**Require two electrons P****T**** >8/12 GeV/c,  third lepton P****T**** >4GeV/c **
******Φ****(e,e)<2.9, Z mass veto (18-60) GeV**
**MET> 22 GeV,M****T****> 20 GeV,MET significance>8,MET. P****Tl3 ****>220 GeV****2**
**H****T**** <80 GeV (Anti top cut)**

***NO candidates found  ******L=1.1 fb******-1***
***Expected background 0.76******±0.67***

**Observed one event  L=0.9 fb****-1**
**Expected background 1.1 ****±0.4**

**NO EVIDENCE for SUSY **

***Upgraded analysis eel***

***Upgraded analysis  likesign  *********

**Require two likesign isolated muons P****T**** >13/8(<35) GeV/c**
**Invariant mass cut  M********±********Ŧ**** (25-65),  M********±********±  ****(12-110 ) GeV/c****2**
**MT  (15-65) GeV/c****2****,  MET>10 GeV , MET signficance > 12 GeV,   MET .PT ********2   >160 GeV****2****/c**

- D0 Results on New Phenomena (BSM) Searches

- Subhendu Chakrabarti

## Search for SUSY Trileptons 

** ****Associated Chargino/Neutralino Production**

**Combined results with e********l,********l,eel,like sign ******** **

***Limits on ************.BR for five MSugra points ******→***
***Chargino mass region below***
***140 GeV/c******2****** ruled out (LEP 103 GeV/c******2******) ***

- D0 Results on New Phenomena (BSM) Searches

- Subhendu Chakrabarti

## Search for Squarks and Gluinos in jets + MET

**Three different parameter region with tan ********=3, A****0****=0, ********<0**

- Low m0 →  dijet (GeV)
-  msquark 375 <m gluino 416 m0=25, m1/2=165

-    high m0 → gluino (GeV)
-   msquark 542 >m gluino       296 m0=500, m1/2=100

- Intermediate region 3jets   msquark 380 mgluino 380  m0=188, m1/2=145

**Event Selection**

**Acoplanar dijet **
**  ****pT>35 GeV |********|<2.5**
**e/******** veto**
******(MET,j1/j2)>90****0****/50****0**
**MET>225 GeV **
**HT >300 GeV**

**Multijet with 3 jets **
**  ****pT>35 GeV |********|<2.5**
**e/******** veto**
******(MET,j1/j2)>90****0****/50****0**
**MET> 150 GeV**
** ****HT >400 GeV**

**Multijet with 4 jets  **
**    ****pT >35/20 GeV|********|<2.5 **
**e/******** veto**
******(MET,j1/j2)>90****0****/50****0**
**MET>100 GeV **
**HT >300 GeV**

***Good agreement with SM prediction ***

**dijet search corresponds to scenario when squarks are much lighter than gluinos, so  mostly squarks produced multijet is when gluino is much lighter than squarks**

- D0 Results on New Phenomena (BSM) Searches

- Subhendu Chakrabarti

## Search for Squarks and Gluinos in jets + MET

- dijet

- intermediate

- gluino

**No MSUGRA**

- LEP

- D0

- D0 Results on New Phenomena (BSM) Searches

- Subhendu Chakrabarti

## GMSB Inspired SUSY Models in  

***Search for Gauge mediated SUSY breaking with NLSP ***

**Require: 2 photons E****T****(γ)>25 GeV**
**MET>45 GeV **
**No back-to-back jet with MET**
******Φ****(MET,jet)<2.5 **
**Remaining 4 candidate events in data **
**Total expected background 2.1 ****± 0.7**

***Messenger mass M******m******=2*********
***No of messengers N******5******=1***
***tan ************ =15 ************>0***

**Good agreement**

***Lower limit on lightest ***
***Neutralino Mass >120 GeV***
***Chargino Mass  > 220 GeV***

- D0 Results on New Phenomena (BSM) Searches

- Subhendu Chakrabarti

## Conclusions

**No evidence of New Phenomena with 1 fb****-1**** data yet !**
**Several New Phenomena Search reaching sensitivity in the parameter space well beyond existing limits **
**More data on tape **
**    ****Stay tuned. **
**	****	**

- D0 Results on New Phenomena (BSM) Searches

- Subhendu Chakrabarti