# Presentation: 701178

## Chargino and Neutralino Search

**Anadi Canepa (Purdue University)**
**Oscar Gonzalez (Purdue University)**
**Mariopaolo Giordani (Universita’ di Udine)**

## Scan of the parameter space

_**SUGRASCAN**_
**Package implemented to perform the scan**
-  Input, parameters at GUT scale (m1/2,m0,A0,sgn,tan)
-  Routine **SUGRA**, to solve the RGE and to calculate the mass spectra
-  **ISAJET **(7.51) and **PYTHIA** (6.203), to calculate the cross section at LO and BR of all particles (the value used for the cross section does NOT include a factor 1.5 needed to correct for NLO)
-  **PROSPINO**, to calculate the cross section at LO/NLO

## Scan

-  _**First Scan to select the best region **_
_**in the parameter space**_:
*Monodimensional Scan ([mass]=GeV)*
- 1) Snowmass Slope1a: m0=-A0=0.4·m1⁄2, tan=10, >0  **m ****1/2 ****varies**
- 2) mSUGRA report m0=-A0=200, m 1⁄2=200 , >0, **tan******** varies**
*Bidimensional Scan **([mass]=GeV)*
- 3) mSUGRA report A0=0, tan=10, >0  **double scan in m****0**** and m****1/2**
- 4) Scan m0=60, tan=5, >0  **double scan in A****0**** and m****1/2**
- 5) Scan m0=60, A0 = 0, >0  **double scan in tan******** and m****1/2**

|  | M1/2 | A0 | tan |
| --- | --- | --- | --- |
| M0 |   |   |   |
| tan |   |   |  |
| A0 |   |  |  |

- For > 0 and  < 0

## SnowMass SP1a: masses 

## SnowMass SP1a:

## Snowmass Slope 1a:  contribution 

**Slope1a:**
- Intermediate value of tan
- -rich neutralino and chargino decay

**HL0 channel opens  **

## SnowMass SP1a: 

**M****1/2**** = 610 GeV**, Decay mode LEP & NLEP allowed:
- m (C1NLep) =1.2 GeV

**M****1/2**** = 605 GeV**, Decay mode TAU & NTAU allowed:
- m (C1NTAU) = 1.87 GeV  while m (C1NLep)<0

**M****1/2**** = 250 GeV, **
- Decay mode N1 & W allowed:
- m (C1N1)= 80.5932 GeV > m(W)

- 3 body decay  2 body decay

## SnowMass Slope1a

- Strong dependence in M1/2
- BR: Max value 6·10-2

**BR of C1 into  Lepton + neutrino + LSP**
- Both 3 and 2 body decay are taken into account

- Lepton sneutrino decay channel opens

## SnowMass SP1a: 

**No discontinuities observed at M****12**** = 280 GeV**

- At m1/2 = 280 GEV
- Real Z decay mode accessible
- Virtual Z decay mode suppressed
- Slepton mode enhanced

- At m1/2 = 350 GeV
- HL0 decay accessible

## SnowMass Sp1a: Decays for Neutralino 2

- At m1/2 = 280 GeV
- Higgs decay mode opens
- Higgs couples to fermions as (mf)2

## SnowMass Slope1a

**BR of N2 into  DiLepton + neutrino + LSP**
- Both 3 and 2 body decay are taken into account

## SnowMass SP1a

**Number of expected events for 500 pb****-1**

## Monodimensional Scan in tan

- Monodimensional Scan in tan

- mSUGRA report m0=-A0=200, m 1⁄2=200 , >0, **tan******** varies**

**TAU1**

## Monodimensional Scan in tan

## Scan in tan

**TAU1 Decay mode opens at tan******** = 35**

- Yukawa coupling increases with sec
- High mass split for 3 generation

## Scan in tan

-  m0=-A0=200, m 1⁄2=200 , >0

## Scan in tan

- The optimized tan region depends upon the signal

**Number of expected events for 500 pb****-1**

## Double Scan

- To look for the highest sensitivity in the TRILEPTON channel

**[Mass]=GeV & [BR*Sigma]=pb**

- A0=0, tan= 5 , >0

- Good sensitivity region:
- M1/2 in [160;200]
- M0 in [100;150]

## More Scan

**[Mass]=GeV & [BR*Sigma]=pb**

## Double Scan: M1/2 vs M0

- Double Scan: M1/2 vs M0

**Number of expected events** **for 500 pb****-1**