# Presentation: 923039

## Tibor Kurča

- IPN  Lyon

**DIS 2004**
**Štrbské Pleso, Slovakia**
**14.-18. 4. 2004**

**On behalf of CDF & D0 collaborations**

- 14.-18.4.2004

##  Tevatron and CDF & D0 detectors upgrades
 Supersymmetry searches
   Direct:
         * in mSUGRA: 
             3-leptons  + mET (charginos, neutralinos)
             jets  + mET          (squarks, gluinos) 
       * in mGMSB:
            2-photons + mET (charginos, neutralinos) 
   Indirect: 
            Rare B-meson decays (lightest Higgs)
 Summary

** ****Supersymmetry searches**
**   ****Direct:**
**         ***** ****in mSUGRA:**** **
**             *****3-leptons  + mET***** *****(charginos, neutralinos)***
**             *****jets ***** *****+ mET         ***** *****(squarks, gluinos)***** **
**       ********* ****in mGMSB:**
**            *****2-photons + mET***** *****(charginos, neutralinos)***** **
**   ****Indirect:**** **
***            ******Rare B-meson decays ******(lightest Higgs)***
** ****Summary**

**Outline       **

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## Tevatron Upgrade - RUN II 

**Higher energy:**
- √**s = 1.8 TeV ******** 1.96 TeV **
** ****Higher cross sections**** **
**    ****(30-40 % for SUSY)**
**More(anti)protons/bunch**
**   ****(****New Main Injector & Recycler)**
**More bunches:**
**   ****6x6 ******** 36x36 bunches**
**  ****(3.5 ********s ******** **** 396 ns)**
** ****Higher luminosity**
**   ****Run I  : 2x10****31**** cm****-2****s****-1**
**   ****Run II : 2.9x10****32**** cm****-2****s****-1****  **

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## D0 Detector – Run II

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## CDF Detector – Run II

**New Si Tracker:**
** ****|********|****< 2;**** 7-8 layers**
**Central Drift Chamber:**
******  ****1.0;  ****96 layers**
**Solenoid/ Time of Flight**
**     ****150 ps /150 cm**
**Muon Drift Chambers**
**Muon Scintil. Counters**
**      ****extended coverage**** **
******|********|= 1 ******
**Forward Calorimeter**
**      ****1.1 ******** ********  3.5**
**Trigger :**
** ****COT tracks at L1**
** ****Silicon tracks at L2**
**DAQ**

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## Run II Data Taking 

- Presented analyses are based on data taken before Sept 2003
- All results are preliminary !

- Sept  2003

**Physics Analysis Sample **
**∫L ****dt ******** ****200pb****-1**

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## SUSY Particles Spectrum

**Rp-conservation  ********   produced in pairs**
**                              ********   ****existence of stable LSP**

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## Trileptons in mSUGRA 

**3-leptons (isolated) final state – *****« gold plated  channel »***
**Challenges: - low x-section (EW-production) **
**                          ****- rather soft leptons !**** **
**Background:   W+Z ******** ****l******** l l**
**mSUGRA mass assumptions:**
**                                                                                                   **
**Search in 3 channels:**
**2e + lepton**
**e + ********  (+lepton)           ****combined results  ******** higher sensitivity**
**2 LS ********     **

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## mSUGRA Trileptons:  2e + l      (1)

**      ****Background rejection**
**Z:****  ****15<Mee<60 GeV**
**            ********(ee) <2.8**** **
**W********e********(+********):**
**       ******** ****1 hit in silicon or**
**       ****tighter e-likelihood**
**jets:**
**      ****veto jets ET>80 GeV**
**      ****scaled mET > 20 GeV**
**Drell-Yan:**
**        ****m****ET>20 GeV**
**        ********(e,mET)>0.4**
**   ‘****Wannabe’ signal**

******L ****dt = 175********11/pb**

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## mSUGRA Trileptons:  2e + l      (2)

**2 electrons, track matched: ****pT > 12  (8) GeV, ******** 1.1 (3.0)****                **
**mET > 20 GeV**
**3rd lepton****  ******** isolated high-quality track**
**Final cut:  mET ******** pT(track) > 250 GeV **
******(signal)  = 2 – 3 %**

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## mSUGRA Trileptons:  2e + l      (3)

** ****expected signal events****   0.8 – 1.6 ; ****tan ******** =3, m******** =(100-115)GeV**
** ****expected bgr****  0.3 + 0.4 – 0.3    ****(Z********ee, WW********e******** e********;  limited MC statistics)**
** ****1 event observed**** : *****pT1=33.3, pT2=25.7,  pTtrack=8.6 ***
***                                      ******mET=52.1 GeV***

-  ****

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## mSUGRA Trileptons:  e +  (+ l)      (1)

**     ****Selection cuts:**
** ****good**** ****e ,******** ****with isolated, matching tracks:**
**      ****pTe>12, pT********>8 GeV; ******** - also calorimeter isolation**
**mET > 15 GeV**
**minimal transversal mass:**
**  ****15<minMT(e********, ********)<80 GeV (Z/*****************, WW cut)**
**no dileptons with masses around MZ**
**   ********veto 70-110 GeV, ********(********, ********) < 2.5; ********(********,e) > 0.3**
**jet veto**** : ****pT> 60 GeV  (1-jet events)**
**       ****(anti tt)     pT1 > 40 , pT2 >30 GeV (********2 jets)**
**anti ********-conversion cut:****  **
**      ****silicon  (SMT) hits ********3 for e-track (W********)**
**                                     **

******L ****dt = 158********10/pb**

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## mSUGRA Trileptons:  e +   (+ l)      (2)

**2 subselections:**
**  ****(a)****   imbalance between pTe, pT******** and MET: **
**           ****( for e + ******** , 3****rd**** ****l missing !**** ******** ****anti WW cut)**
**  ****(b)****  3rd lepton  ******** isolated high-quality track pT>3 GeV**
**              ****( hollow cone, track from the same vtx as other 2, CFT hits..)**
**             ****most of the remaining bgr**** ****↘****... but also signal**** ****↘**** **
**Results:**
**      ****expected signal events****   0 – 0.9  ;**
**                                             ****tan ********=3, m******** =(97-114), m********° =(57-67)**
**      ****expected bgr :          **** ****(a)**** 2.87 ******** 0.36   ******** ****1 event observed **
**     ****(Z/*********->********, WW,W+jets/ ********)****    ****(b)**** 0.54 ******** 0.24   ******** ****no event observed **

**±**

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## Like-Sign Dimuon Channel   (1)

_**Idea:**_** 3****l ******** 2LS-leptons****....**** ******** profit from increased acceptance,**
**                                                              ****while reducing bgr **
_**Challenge:**_**  ****modelling bgr **
**        ****tt, W+jets, WZ, ZZ  ******** Monte Carlo**
**     ****-                      taken from data **
_**Selection Cuts:**_
**      ****2 track-matched, isolated like-sign ********,  ******** (********, ********)<2.7**
**       ****pT1 > 11 , pT2 > 5 GeV,  mET > 15 GeV**
**      ****topology to kill bb:****     ****if pT2 < 11 GeV  ********   ********(jet,mET) < 2.4; **
**                                           ********min(mET, ********)>0.5,  ********max(mET, ********)<2.4,  **
**      ****mass cuts to kill Z:****     OS ******** - M(********, ********)<70 or M(********, ********)>110 GeV**
**                                           ****LS ********  - M(********, ********)<80 GeV  (avoid sign flip)**

******L ****dt = 147********10/pb**

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## mSUGRA LS Dimuon Channel   (2)

_**Data points:**_**   **
**        *****M(************,************) – isolated LS***
_**Shaded histogram:**_
**   *****remaining bgr estimated from ***
***   ******nearly-isolated LS data***
_**Results - events:**_
** ****expected signal : ****0 – 0.4;     ****  *****(tan ************=3, m************  ******=(97-114), m************°=(57,67) )***
** ****expected bgr:      ****0.13 ******** 0.04**** *****(bb, WZ, ZZ, Z************)***
** ****observed:****             ****1 event****     *****pT1=29.1, pT2=13.8,  LSmass=37.8,  ***
***                                                ******mET=33.5GeV,   ************=1.55***

**±**

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## SUSY Trileptons – Combined Result  (1)

**mSUGRA :****  *****tan ************ =3, ************>0,****** ******A******0******=0, m******0=******(72,88), m******1⁄2=******(165,185)***
***                      ******m************ ************ m************° ************ 2m************°****** ***
**   ****2e + ****l**
**   ****e + ********  (+ ****l**** )****         ****combined using Likelihood Ratio Method **
**   ****2 LS ******
**signal overlap****  ****15 %**** (5%)  between ****e+********+****l****  (****e+********)  ********  e+e+****l ,**
**                              ****negligible for LS-dimuon analysis**
**overlap**** ******** ****event assigned to channel with the highest S/B **
**correlated errors**** taken into account (main ****L ****uncertainty)**

**±**

**1**

**1**

**2**

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## SUSY Trileptons – Combined Result  (2)

**significant improvement of Run I limit**
**not reaching mSUGRA prediction yet ... ******** ****constrain more generic SUSY**
**                                                             ****models with compatible mass hierarchies**

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## Squarks & Gluinos Search in mSUGRA

**Squarks, gluinos pair production dominates**** **(if light enough...)
-      - consider only 1st & 2nd families with degenerate masses
-       - decay chains depend on mass relations
-       - general event signature:  n-jets + MET +m-leptons
** ****Have a look at :**
**                       **
**                       ****production  & 2-body                      decays  dominate**
**                  **
**                **
**               **
**                        ****Background: QCD, W/Z+jets**

**Signature:** ******2  acoplanar jets + mET**

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## 

Jets + Missing ET Trigger (L2, L3) from April 2003   
  2 jets (cone 0.5) in acoplanar topology  
           pT1 60,  pT2 50 GeV,   det1 0.8   -  SM, QCD bgr
not EM-object –jet1,jet2 (emf<0.95) 
no EM-object with pT>10 GeV                           W/Z+jets
no isolated   with pT>10 GeV
anti  -wrong vertex, -cosmics   (cpf>0.05)
mET  60 GeV                        QCD (moderate MET/correlated  with jets) 
30  (mET,jet) 165 

Final cuts:  mET  175 GeV,   HT(=Etjets)  275 GeV 
                         (optimized for m1⁄2=130 GeV )                          

- Jets + Missing ET Trigger (L2, L3) from April 2003**   **
** ******** ****2 jets (cone 0.5) in acoplanar topology****  **
**           ****pT1 ********60,  pT2 ********50 GeV,   ********det1******** 0.8   -  ****SM, QCD bgr**
**not EM-object –jet1,jet2**** ****(emf<0.95)**** **
**no EM-object**** ****with pT>10 GeV****                           ****W/Z+jets**
**no isolated**** ********  ****with pT>10 GeV**
**anti  -wrong vertex, -cosmics   (cpf>0.05)**
**mET ******** 60 GeV                        ****QCD ****(**moderate MET/correlated  with jets)** **
**30******** ******** ********(mET,jet)******** 165 ******
**                                                         **
**Final cuts:  mET ******** 175 GeV,   HT****(****=********Et****jets****)**** ******** 275 GeV**
-                          **(optimized for m****1⁄2=130 GeV )****                          **

**Squarks & Gluinos – Event Selection**

**Data : ********L ****dt = 85 pb**

**-1**

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## Squarks & Gluinos Search : Results (2)

**mET > 175 GeV**
**HT    > 275 GeV**
**Observed 4 events**
**Expected 2.7 ± 0.95**

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## Squarks & Gluinos Search: Results  (1)

** ****observed 4 events**
** ****expected 2.7 ******** 0.95**
** **_**Systematics**_
**  ****luminosity:   ****      ****6.5 %**
**  ****cross-sections:    ****8% SM bgr;     10% signal (from Prospino)**
** ****jet energy scales (data & MC):**
**      ****+77%  -43%  SM background**
**      ****+20%  -15%  signal efficiency****    **

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## Signal x-section: PYTHIA (LO) + k-factors PROSPINO (NLO)
mSUGRA parameters: m0 = 25 GeV, A0 = 0, tan  =3, <0             m1⁄2 = 100 - 140 GeV   scan in 5 GeV steps
  Mass  limits:  Msquark > 292 GeV,      Mgluino > 333 GeV

**mSUGRA parameters:** *m0 = 25 GeV, A0 = 0, tan **** =3, ****<0             m1⁄2 = ****100 - 140**** GeV*   scan in *5 GeV* steps
******  ****Mass  limits**:  **Msquark > 292 GeV,      Mgluino > 333 GeV**

**Squarks & Gluinos Mass Limits**

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## Pairs production
     - large tan  
   3rd generation sparticles could 
    be light due to large mixing     

-      - **large tan ****** ****
-    **3rd generation sparticles could **
**    ****be light due to large mixing**

**Gluino production**

**Sbottom Quarks Production @Tevatron**

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##                                                                                                     4 bjets + MET

Background:        -QCD, Top, W/Z+jets
Preselection cuts:                                          Signal cuts:
     3 jets  15 GeV,  < 2                                       mET > 50 GeV 
    mET > 35 GeV                                                         1 b-tag  svx 
    lepton veto        (EW bgr)                                         2 b-tags svx
    (mET,jets)    (QCD bgr)

Assuming:
Btag              Observed evts        Expected Bgr      Expected Signal
=================================================
Single                     4                       5.6  1.4                   10.6  1.7 
Double                   1                       0.5  0.1                     4.4  0.9

_**Background:**_        -QCD, Top, W/Z+jets
_**Preselection cuts:**_**                                          **_**Signal cuts:**_
-      3 jets  15 GeV,  < 2                                       mET > 50 GeV
-     mET > 35 GeV                                                         1 b-tag  svx
-     lepton veto        (EW bgr)                                         2 b-tags svx
-     (mET,jets)    (QCD bgr)
**Assuming:**
**Btag              Observed evts        Expected Bgr      Expected Signal**
**=================================================**
**Single                     ****4                       5.6 ******** 1.4                   10.6 ******** 1.7**** **
**Double                   ****1                       0.5 ******** 0.1                     4.4 ******** 0.9**

**Sbottom Quarks from Gluinos**

******L ****dt = 38.4/pb**

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## Sbottom & Gluino Limits

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## Gauge Mediated SUSY Breaking

**SUSY breaking at a scale ******** ~10-100 TeV (<< GUT)**
**     ****mediated by new gauge fields – « messengers »**
**LSP is gravitino****  **
**     ****- very light  M(    ) < 1 keV**
**if NLSP is neutralino:**
**   ****(              ****also possible****)**
**            **
**  **
**Exp. Signature: ****2 photons + mET**** **
**Assume prompt NLSP decay ******
**     ****photons pointing to interaction vtx**** **

- CDF Run 1

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## mGMSB   2 +mET search : Analysis

**Background:**** ****1. fake mET**** ****-****   ****mismeasured  jets, vtx**** **
**                                 ****2. real mET****  ****-  lost e-track, fake ******** **
**                                      ****W ******** ********e******** ******** (dominant), Wj ********e******** j, Z, WW, WZ, top**
**Event selection:****  ****2 isolated photons****   ****ET> 20 GeV,   ********det********,     **
**   ******** ****no matching tracks,  no tracks in hollow cone**** ****(0.05, 0.4)   ******** pT < 2 GeV****   **
**   ****- ****topology : ********(mET,jet1) < 2.5**
**                       ********(mET, ******** ) > 0.5****    **
**   ****- optimized mET > 40 GeV**
**Signal****:**** ****looking for excess in tails **
**                       ****of mET  distribution**** **

**mET (GeV)**

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## mGMSB   2 +mET search :  Results

**Observed rates consistent with SM**
**New limits:**
**Errors:****  ****reco eff. 5%**
**       ****MC-accept. 6%,  ****L 6.5%**
**mGMSB parameters**
**  ******** ****- scale of SUSY breaking**
**  ****Mm=2********  ****- messenger mass scale**
**  ****tan ******** = 5****  ****- vev’s ratio**
**  ******** ****> 0**** ****– sign of higgsino mass term**

****** ****(TeV)**

******L ****dt = 185********12/pb**

**95% CL**

- World’s best !

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## mGMSB   2 +mET :  CDF  Results

**Event selection:****  ****2 isolated photons****   E****T****> 13 GeV,  ********det********, **
**                                                                   ****mET > 25 GeV   **
**Expected events:  ****bgr 2 ****± 1 ± 1;  signal 6.6 **
**2 events found**
**Mass limit  :**
**tan ********=15, ********>0, M=2********, N****5**** =1**

****** ****(TeV)**

******L ****dt = 84/pb**

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## Rare B-meson Decays – Indirect SUSY Search

**SM prediction:**
**FCNC decay - very sensitive probe beyond SM **
**not observed yet , best limit is                                         ****CDF-I**
***Can be very strongly enhanced ***
***     ******for high  tan(************)  SUSY***
**    *********** ******complements 3-lepton search***
***SUSY  predicts  enhancement by 10-1000 !***
** *****... ******in mSUGRA correlation with a*****                     **
**                      ****search in ********M=±80 MeV**
** ****centered on world average Bs(Bd) value**

******

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## Rare B-meson Decays:  Results

**expected events:**** ****1.05 ****± 0.30    ... Bs**
**                                 ****1.07 ± 0.31    ... Bd**
**                                 ****1.75 ± 0.34    ... combined**
** ****found 1 event :**** ****M(********) = 5.295 GeV****  ... ****in both windows**
**   ******** ****Limits @ 90% CL** :
-   ... **3x better than  Run I**
-   ... **BELLE@LP03 1.6E-7**

******L ****dt = 171/pb**

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## Summary

**Presented results based  on ****L  ≤ 185**** /pb**
**Tevatron experiments  are exploring ****« Terra Incognita »****         **
**     ******** ****limits extended beyond Run I :**
**      ****-  3****l + mET**
**      ****- jets, b-jets + mET**
**      ****- GMSB 2******** + mET  **
**Many analyses in progress,**
**      ****first Run II papers coming soon**
**Tevatron performance improving **
**      ******** ****end of 2004 on tape ~ 0.5 /fb****  **
** ****Better optimized analyses**
**       ******** **** ****higher sensitivity to signal**
***Excellent opportunity for ***
***      ******exciting physics ***
***      ******at the highest energy frontier***

**Hic Sunt Gluinos**

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## Luminosity Prospects

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