Physics Beyond the y y Standard Model Standard Model David - - PowerPoint PPT Presentation

Physics Beyond the y y Standard Model Standard Model

David Toback David Toback

Texas A&M University

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

1

For the CDF and DØ collaborations

Mini-Symposia on Searches

E iti N S h R lt f th T t Exciting New Search Results from the Tevatron Our speakers will show a fun subset today, including

• The Dijet Mass Spectrum and a Search for Quark

C it t CDF Compositeness at CDF

• Search for charged massive long-lived particles at DØ
• Search for scalar top decaying into charm and neutralino at

CDF CDF

• Setting Limits on Gauge Mediated Supersymmetry Breaking

Models with Photons at CDF

• Search for trilepton SUSY signal at CDF

In this talk I’ll provide an overview for these searches to place them in context Also, see Dave Hedin’s Plenary in Session T2 at 3 30PM d h l f h i il i y 3:30PM today where lots of other, similar, topics will be covered The experiments Results pages – contain many more

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

2 – http://www-d0.fnal.gov/Run2Physics/WWW/results/np.htm – http://www-cdf.fnal.gov/physics/exotic/exotic.html

Tevatron Searches: Looking Back and Looking Forward Looking Back and Looking Forward

The LHC era has started but the Tevatron is still collecting data d l di h h f

“Don't look back

g and leading the search for Supersymmetry and Beyond the Standard Model Physics

Don t look back — something might be gaining

y It’s been 10 years since the Fermilab SUSY-Higgs Workshop  take time to look back and

• n you."
• Satchel Paige

 take time to look back and remind ourselves what we focused on back then U thi t t f t d ’ Use this as a context for today’s searches to provide insight about what things might look lik 10 f

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

3

g g like 10 years from now

Most results today with between 1 and 4 fb-1

• f data

The SUSY-Higgs workshop h ld i 1998 t

• mSUGRA: Still at the forefront of
• ur searches  benchmark model

Run II SUSY-Higgs Workshop View

was held in 1998 to study the prospects for the Tevatron 5 m in t pi :

• ur searches  benchmark model

for SUSY

• GMSB: Came into vogue after the

Run I CDF ee+Met candidate t Still l t d

5 main topics: 1.mSUGRA 2.GMSB

• event. Still popular today
• RPV: Harder to decide what

versions are important

• BSM: Many of these models have

3.RPV 4.BSM (Extra Dimensions) 5 Higgs

BSM: Many of these models have been searched for in great detail, (W’, Z’, leptoquarks, etc)

• Notable exceptions: Extra

Dimensions which has taken on

5.Higgs Clearly envisioned much of the very broad and deep Tevatron search program

Dimensions which has taken on prominence since 1998

• Long-lived heavy particles
• Higgs: Compelling as it ever was

Tevatron search program What’s different in our thinking? What’s the same?

gg p g Omissions? Not envisioned?

• No model-independent search

methods P i i C l d t

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

4

What s the same?

• Precision Cosmology data

“There are some theories that are so compelling that it’s worth doing a comprehensive and systematically deep set of searches to see if they are realized in nature” – Anonymous

What is Supersymmetry?

S t (SUSY) i th th t Supersymmetry (SUSY) is a theory that postulates a symmetry between fermions and bosons

Q|Boson> = |Fermion> Q|Fermion> = |Boson> Q|Fermion> = |Boson>

Minimal Supersymmetric Standard Model (MSSM)

Quarks  Squarks L pt n  Sl pt n Gauge Bosons  Gauginos The gaugino states mix f h APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

5

Leptons  Sleptons  Refer to them as Charginos and Neutralinos

Dark Matter?

G l t t d Galaxy structure and rotations well explained by lots of explained by lots of “Dark Matter” we can’t see directly Mostly clumped at the center due to gravity gravity Lots of it in a “halo” around the entire around the entire galaxy

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

6

Evidence for Dark Matter as Particles Colliding Galaxies Colliding Galaxies

Galaxy Galaxy Galaxy Blue is the part from Red part from x-ray Li ht f m G l x lensing only “Fast  Dark Matter”

• bservations light

“Slow Stars” Stars and D k M tt Stars and D k M tt Light from a Galaxy Dark Matter Dark Matter

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

7

Particle Physics solution to an Astronomy problem?

• Good: Predict massive stable

particles that can collect in the p galaxy and have an impact on the way it rotates y

• Better: Provide both a model of

particle physics and cosmology that particle physics and cosmology that gets the Early Universe Physics correct and correctly predicts the correct and correctly predicts the Dark Matter Relic Density

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

8

Dark Matter = Supersymmetric Particles? Supersymmetric Particles? SUSY provides a Not good enough to simply provide

a candidate, need to describe l h d

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

9

full calculation

• f SUSY DM

early Universe physics and correctly predict the Dark Matter relic density

Mi i l S l ti ith N M l l N Mi i l S l ti

Cosmology and Particle Physics?

Minimal Solution with Cold Dark Matter

• Minimal Solution  A

particle produced in th l U i i Non-Minimal Solution with Cold Dark Matter

• Many non-Minimal

solutions to the Dark M tt b Non-Minimal Solution with Warm Dark Matter Warm Dark Matter also consistent with the early Universe is stable and weakly interacting  still here today CDM favored by Matter we observe today

• Example: Long-lived

Charged particles (CHAMPS) that decay consistent with Astronomical data and inflation models

U S Y i h Md i d S a ug e E x a m p le : G

• CDM favored by

most Cosmological models

• Lots of

Supersymmetry (CHAMPS) that decay to the Dark Matter

~ ~ H A M P E x a m p le : C

G ~ χ ~ U S Y w it h M e d ia t e d S

1

 

Supersymmetry models have a lightest particle that fits this description

• The minimal SUSY

Stable on Stable on Dark Matter is more complicated or has nothing to do with SUSY

1

χ   

The minimal SUSY model that incorporates supergravity grand unification is known SUGRA  Stable on the timescale

• f

inflation Stable on the timescale

• f the age
• f the
• Axions?

Look for the most general models including R-Parity i l ti i APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

10

as mSUGRA  our baseline Cold Dark Matter search model Universe violating scenarios

Outline of the Searches

Th T t d th

• The Tevatron and the

Detectors

• mSUGRA Searches

–Squarks & Gluinos Squarks & Gluinos –Gaugino Pair Production Production –Indirect Searches

• Gauge Mediated

Searches

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

11

• Conclusions

The Fermilab Tevatron

Protons and anti Protons and anti- protons collide with s = 1.96TeV

• The Tevatron is the

high Energy Frontier until LHC turn-on until LHC turn on

• Rumours of running

until 2012 to be complementary to LHC complementary to LHC

Data coming in very nicely and getting

Delivered: ~6.5 fb Delivered: ~6.5 fb-1

1

Acquired: ~5.5 fb Acquired: ~5.5 fb-1

1

nicely and getting better all the time APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

12 Analyzed: ~2 Analyzed: ~2-

• 4 fb

4 fb-1

1

(depending on the analysis) (depending on the analysis)

The CDF and DØ Detectors

Powerful multi-purpose detectors High quality identification for electrons

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

13

High quality identification for electrons, muons, taus, jets, Missing Energy, photons, b’s etc.

Aside for our LHC Friends

M t l ill l k Most analyses will look like they were easy Nota Bene: It’s 2009

“It’s a lot of work to make it look this easy”

Nota Bene: It s 2009 and we’re 8 years into running

look this easy – Joe DiMaggio

g This is a lot harder than it looks and it takes a l t l th it lot longer than it should I’ll try to comment

“In Theory, theory and practice are the

I ll try to comment periodically on lessons for LHC

practice are the

• same. In

practice, they’re different”

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

14

different – Yogi Berra

The Sparticle Masses

I t i l SUGRA

g ~ q ~

In a typical mSUGRA scenario

• Squarks and gluinos

h

4 2 ~

, ~   ~

q b ~ ~

are heavy

• 1st and 2nd

generation squarks are mass degenerate

3

~ 

t ~ l ~

are mass degenerate

• The lightest

neutralino is the LSP D k M tt

1

~ 

2 1 ~

, ~   l

 ~

For large values of t n St p Sb tt m

• Dark Matter

candidate tan Stop, Sbottom and Stau can get much lighter Can also have a Need complementary

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

15

Can also have a significant effect on the branching ratios p y searches for low tan and high tan

Golden Channels

Th i t l k f i i l/C ld D k Three main ways to look for minimal/Cold Dark Matter Models in mSUGRA type models

• Direct production of Squarks and Gluinos

Direct production of Squarks and Gluinos – Heavy, but strong production cross sections Di t d ti f th G i

• Direct production of the Gauginos

– Lighter, but EWK production cross sections also leptonic final states have sections, also leptonic final states have smaller backgrounds

• Indirect search via sparticles in loops

Aff b hi i – Affect branching ratios

Start with low tan, then move h i h hi h 

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

16

to searches with high tan

Squark and Gluino Searches in Multijet + Met

Three main production diagrams Three main production diagrams

Final states are mass dependent

q ~ g ~

M M 

q ~ g ~

M M 

q ~ g ~

M ~ M

q ~ g ~

M M 

2 jets + MET 3 jets + MET 4 jets + MET

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

17

3 separate final states + Unified Analysis  best coverage

Unified Squark/Gluino Search

2 jets + MET 3 jets + MET 4 jets + MET

SUSY Interpreter APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

18

New Physics in Dijets+Met

Lepto- Quark Squark

Al

New Physics in Dijets

p

Quark

Also Sensitive T

J e t

1

~ 



p

J e t

p

To Lots of M d l

J e t

1

~ 



p J e t

Sensitive To

Models

J e t J e t

Lots of Models APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

19

Lots of Gaugino Pair Searches

• Best current limits

from Trileptons from Trileptons – Hedin’s talk N i mi

• New version coming

– Vogel’s talk later h this session

• New: Heavy Gauginos

y g WZ+Meteejj+Met

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

20

High Tan

• Likelihood fits

Allanach PLB 635 123 (2006)

• Likelihood fits

including Higgs mass limits, g-2, and other experimental data to

Allanach, PLB 635, 123 (2006)

experimental data to the MSSM in the plane of m1/2 and tan – Prefers high Tan refers h gh an

• Stop and Sbottom

masses can be very different than the

• ther squark masses
• Gaugino branching

fractions to ’s can 100% h rise to 100% as the stau gets light… Emphasis on tan just starting during SUSY-Higgs Workshop Now we have a full suite of h h d h

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

21

high tantargeted searches

Th h f B 

Indirect Search: Bs  

The search for Bs   is perhaps the most sensitive to SUSY i ti l h since sparticles show up in loops Especially sensitive at p y high tantan

BRSM=3.86x10-9 APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

22

Sbottom Searches

Two primary Sbottom Two primary Sbottom searches in b+jets+Met 1. Sbottoms from gluinos 2 Direct sbottom pair 2. Direct sbottom pair production

Accepted to PRL, p arXiv:0903.2618

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

23

DØ, PRL 97 171806 (2006)

Stop Searches

L t f

1

~ 



l

 1

~ 

Lots of Analyses

Di t ti

p

t ~

c

~ 

• l

b



~ 

1

~ 

Direct counting Experiments

t ~

p

1



cb

1



1

~ 

Dileptons+Jets+MET Charm+jet+MET Dileptons+Jets+MET

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

24

Other Stop Searches

j

p

t ~

1

~ 



l

b

 1

~ 

Fit for Stop Admixture in top

2 Analyses



j

j

j

p

t

• l

b

 1

~ 

Adm xture n top sample

Lepton+Jets+MET Dil t J t MET

 p

t ~

1

~ 

b

Dileptons+Jets+MET

MStop= 155 GeV Mtop= 172.5 GeV

p

t

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

25

s Ligh t ta n H igh ' ~   

Complementary search for Squarks: Jets + + Met Jets  Met

re gio n

• n

a n n ih ila ti

• c
• th

e like pla c e s f a vo rs d a ta C

• sm
• lo

gy Pre c isio n R e c e n t

1 2

χ ~ χ ~ ~ a n d th e be tw e e n in m a ss a h a s re gio n

• n

a n n ih ila ti

• c
• 



APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

26

Gauge-Mediated SUSY Breaking Models

44.8 GeV

e1 ET = 36 GeV γ2 ET = 30 GeV e Candidate ET = 63 GeV γ1 ET = 36 GeV

eeγγETCandidate Event

ET = 55 GeV

ca nd id a t e m a t t e r d a r k w a r m a p r

• v

id e m

• d

e ls G ~ χ ~0

1

 

44.8 GeV

e1 ET = 36 GeV γ2 ET = 30 GeV e Candidate ET = 63 GeV γ1 ET = 36 GeV

eeγγETCandidate Event

ET = 55 GeV

M t l l ti f

infla t ion

• f

m

• d

e ls a nd ns

• b

s e r v a t io a l A s t r

• nom

ic w ith C

• ns

is te nt

44.8 GeV

e1 ET = 36 GeV γ2 ET = 30 GeV e Candidate ET = 63 GeV γ1 ET = 36 GeV

eeγγETCandidate Event

ET = 55 GeV

More natural solution for FCNC problems than SUGRA

CDF R I M t

mSUGRA

Early Universe Later Universe CDF Run I ee+Met candidate event

G ~

Early Universe Later Universe Warm Dark

1

χ ~

Nanosecond lifetimes

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

27

G

Dar Matter

1

χ

High and Low Lifetime Searches



p

 1

~  G ~



je t

1

~ 

The lifetime and associated particle production dictate

p

G ~



je t

1

~ 

2

~ 

p different final states

• +Met for small

l f

p

G

je t

2



lifetime

• Delayed Photon

+Met for large lif ti Use new Photon Timing system lifetime

Photon arrival is “delayed” APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

28

Conclusions

• The search program for Beyond the
• The search program for Beyond the

Standard Model Physics at the Fermilab Tevatron is both deep and broad

• Unfortunately despite almost 4 fb-1 of
• Unfortunately, despite almost 4 fb 1 of

data analyzed there is no sign of new physics Observations from the perspective on

Perhaps,

Observations from the perspective on the grand plans of the SUSY-Higgs Workshop – Most searches have done as well or

p , looking back 10 years from now, the view

Most searches have done as well or better than we expected – Some of today’s questions will be answered

now, the view from 10 years worth of LHC LHC data will

answered – Some of today’s hot new topics will die away – Some searches and questions we

LHC data will make things LOOK different

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

29

Some searches and questions we never envisioned may come to dominate our every day thinking

different

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

30

Stop Searches



l

M M

p

t ~

1

~ 

c

1

~ 



l

b

 1

~ 

1

~ 

MStop= 155 GeV Mtop= 175 GeV

3 Analyses



t ~

p

p

t

c

1

~ 

• l

b

 1

~ 



t

p

1

~ 

cb

1

~ 

Dil J MET Charm+jet+MET Dileptons+Jets+MET Dileptons+Jets+MET Fit for Stop Admixture

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

31

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

32

Th h f B  i

Indirect Search: Bs  

The search for Bs   is perhaps the most sensitive to SUSY since sparticles show up i l in loops Especially sensitive at high tantan

Preliminary Combined CDF/DØ BR(Bs→μμ )<4.5x10-8

CDF, PRL 100, 101802 (2008)

@95%

BRSM=3.86x10-9 APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

33

Evidence for Dark Matter as Particles: Colliding Galaxies g

Blue is the Dark Matter Red is the baryonic matter (Stars and Hydrogen gas)

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

34

Evidence for This in Nature?

Colliding Galaxies Observed in 2006!

Blue is the part from Red part from x-ray Blue is the part from lensing only “Fast  Dark Matter” Red part from x-ray

• bservations light

“Slow Stars”

APS April Meeting Mini-Symposium May, 2009 Physics Beyond the Standard Model David Toback, Texas A&M University

35