# Presentation: 272994

## Higgs at the Tevatron

- The Interpretation of the Run II
- Higgs Search potential
- Within the MSSM

- SUSY

- Stephen Mrenna   UC Davis

## Why SUSY Higgses are Interesting

- There are more of them
- 3 Neutrals and 1 Charged
- One of them should be light (130-150 GeV)
- Couples to W/Z/t with SM-like strength
- Self coupling  related to gauge couplings
- Sensitive to Top Squark properties
- Couplings not just proportional to mass
- Depends on tan, mixing, SUSY spectrum

## Promising Signatures at Tevatron

- Standard Model-like Higgs bosons
*SM-like couplings to W/Z Bosons*
*W/Z+H(************bb****)*
*Relies on top quark experience in Run I*
- Greatly Enhanced Yukawa couplings
*Non-SM-like couplings to heavy flavor*
*********bb**** + H(************bb)***

## SM-like processes in the MSSM

**SM-like processes in the MSSM**

- h=light CP-even

- H=heavy CP-even

- A=CP-odd

- Spira

## non-Standard processes

- Z*h+A, H+A, H++H-  W*h+H+,H+H+
- Spin suppressed
- Phase space suppressed
- tb+H+, g+b t+H-, etc.
- Most rate for MH+mt-mb
- sensitive to large tan radiative corrections
- Light Stop or Sbottom + Higgs
- Leads to other SUSY signatures

## SM-like Higgs; non-standard BRs

- Yukawa coupling corrections
-  Loop induced coupling between b and Hupsin/cos
- b  Gluino/Sbottom and Stop/Higgsino
- Either sign and O(1) (and =tantan)
-  decays may be greatly enhanced if ghbb0
- A coupling depends just on b
- Higgs mixing effects
- SM-like Higgs is interaction state Hup
- Decay rates to *WW, gg*,*********c*** *c*,  “scaled up”
- Needs large tan as in GMSB or some GUT models

## bb(bb)     

- low mass

- high mass

- Signal=*********bbA+h+H ************ 2A***

- MA (GeV)

- Overlapping signals (within M)

- =A  tan2              *A**********bb,**** *********    complicated by h/H  b dependent

## Charged Higgs: more b

**Charged Higgs: more ********b**

- DØ indirectRunI

- =-500 GeV

- tan  bound moves lower

- b0

- BR contours

- tbH+

- *Carena, Garcia, Nierste, Wagner

## b>0

- =500 GeV

- BR contours

- b>0

- tan  bound moves higher

- Region of greatest experimental sensitivity also has greatest sensitivity to (arbitrarily heavy) SUSY spectrum

## MSSM parameter dependence

- Stress variation instead of specific models
- Minimal Mixing
- Smallest asymptotic MH for fixed MSUSY
- Maximal Mixing
- Largest asymptotic MH for fixed MSUSY
- Large A and 
- Suppression of *H(************bb****)*
- Mgluino sensitivity

## Minimal or No (Stop) Mixing

**Minimal or No (Stop) Mixing**

- Left-Right Stop mixing is tuned to 0
- At=/tan
- Tuning occurs for each value of tan 
- Maximal Mh=115 GeV
- SUSY scale average  Stop mass2=(1 TeV)2
- Higgs masses varying throughout plane
- Coverage gap for      MA~ maximum Mh

- LEP2

*b****b b****b* (CDF/DØ)

- 10 fb-1

- 15 fb-1

## Maximal (Stop) Mixing

**Maximal (Stop) Mixing**

- Large Left-Right Stop mixing
- At~6 MSUSY
- Maximal Mh=125 GeV
- More luminosity needed
*BR h(**** b****b ) is decreasing for M**h**    near upper limit*

- LEP2

- 15 fb-1

- 30 fb-1

- 20 fb-1

*b****b b****b* (CDF/DØ)

## Complementary b Effects

**Complementary ********b ****Effects**

- At=-=1.2 TeV  Mgluino=0.5 TeV

- -At==1.2 TeV  Mgluino=0.5 TeV

- 30 fb-1

- 30 fb-1

- b>0

- b<0

*b****b b****b* suppressed

*h(**** b****b) *suppressed

- “h” depends on b + mixing     “H”/A depends on b

## Specific High-Scale Models

- SUGRA

- 30 fb-1

- 20 fb-1

- 20 fb-1

- 10 fb-1

- Theory excluded

- Expt. excluded

- tan=35

- tan=4

- *Baer, Harris, Tata

## GMSB

## The Dirt

- Constant K-factors do not entirely represent backgrounds
- Region of MA~Mh treated naively
- Signals added in quadrature
- Full NLO *bbH* calculation not done
- Nor is the background!
- No Box-like corrections to W/Z+H
- Contained in diagrammatic calculation
- Effective Potential and Diagrammatic calculations can differ
- Actual systematic errors may vary
- Used Run I experience that Systematics ~ Statistics

## CP Violation

- SUSY breaking parameters in the Stop/Sbottom/Gluino sector may be complex
- Mixing between 3 neutral states
- “h, H, A” H1, H2, H3 mixed CP states
- Upper bound on Higgs mass remains the same
- Higgs couplings to W/Z and fermions differ
- CPV study of Higgs sector necessary to test mechanism for EW Baryogenesis

## CPV at Tevatron

- Large tan and sizeable phase(At)
- MH1=90 GeV, but rate is too small at LEP
- All other modes (H1+H2, etc.) not kinematically allowed

- H1 still has too feeble couplings to W/Z
- Can observe H2 at the Tevatron with 15 fb-1

- *Carena, Ellis, Pilaftsis, Wagner

## Unfinished Business

-  identification and triggering
*gg****H(****)* at high PT
-       *(****)* to cover *H(**** b****b)** *hole
***bb A(****)*
-       *(****bb)* vs     *g** background
- Interesting measurement by itself (see C.Hill et al.)
- Finding overlapping signals
- More pressing when considering CPV

## H() in RunII?

- LEP2

- *Mrenna, Wells

- See also Matchev, Landsberg

- If H(bb ) and/or H( ) is suppressed, then BR(H) can increase

- Not a SUSY-loop effect

- Dominant decays are Hup to WW, gg,c c

- Bosonic Higgs

- Hup

## Summary

- Run II promises rich SUSY Higgs phenomenology
- Test of SUSY prediction for SM-like Higgs
- Higgs CPV would be consistent with EW Baryogenesis
- Potential of observing non-SM-like Higgses
- May observe heavy sparticle effects in b
- Correlated with Gluino/Sbottom or Stop signals
- Light sparticles could yield Additional Signal
- At the least, an important warm-up for LHC