Tevatron SM and BSM Higgs Searches Jay R. Dittmann Baylor - - PowerPoint PPT Presentation

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Tevatron SM and BSM Higgs Searches Jay R. Dittmann Baylor - - PowerPoint PPT Presentation

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Tevatron SM and BSM Higgs Searches Jay R. Dittmann Baylor University For the CDF and D Collaborations 43 rd Fermilab Users Meeting June 2, 2010 Outline Overview Standard Model Higgs at the Tevatron Beyond the

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Tevatron SM and BSM Higgs Searches

Jay R. Dittmann

Baylor University

For the CDF and DØ Collaborations

43rd Fermilab Users’ Meeting June 2, 2010

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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 2

Outline

Overview Standard Model Higgs at the Tevatron Beyond the Standard Model (BSM) Higgs at the Tevatron Tevatron Projections Conclusions

Broken Symmetry

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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 3

The Fermilab Tevatron

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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 4

Collider Physics at the Tevatron

  • W
  • W

e ’ r e s t i l l p r

  • b

i n g t h e T e r a s c a l e a s t h e i n t e g r a t e d l u m i n

  • s

i t y

  • f
  • u

r d a t a i n c r e a s e s

. . .

~

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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 5

The Higgs Boson

  • WZ
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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 6

The Higgs Boson

  • Kibble Guralnik Hagen Englert Brout

(Where is the elusive Higgs?) Englert & Brout, PRL 13, 321-323 (1964) Higgs, PRL 13, 508-509 (1964) Guralnik, Hagen & Kibble, PRL 13, 585-587 (1964)

  • a Google search for

“Higgs Discovery” yielded 50,700 results in the past week

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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 7

The Higgs Boson

  • mH > 114 GeV/c2 @ 95% CL
  • mH < 186 GeV/c2 @ 95% CL
  • 100 < mH < 200 GeV/c2
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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 8

Standard Model Higgs Production

  • in here

and in here

  • Production

gg H WH

  • tt

WH, ZH

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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 9

Standard Model Higgs Decay

Decay

  • (mH > 135 GeV/c2)

H W+W–

  • (mH < 135 GeV/c2)

H bb gg H bb

  • WH/ZH

WZ

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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 10

Higgs Search Channels at the Tevatron

  • WH lbb

ZH bb ZH llbb H WW ll

These are the major search channels, but the Tevatron has a comprehensive search program exploiting many other production and decay channels to maximize search sensitivity x 2 experiments

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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 11

Higgs Search Strategy

  • I. Maximize Signal Acceptance
  • III. Employ Multivariate Techniques
  • II. Reduce Background
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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 12

Higgs Search Strategy

ZH → llbb

  • ZH
  • ~

Z

  • Z
  • I. Maximize Signal Acceptance
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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 13

Higgs Search Strategy

  • Identifying b-jets (btagging

b b 50–60%b~1%

  • II. Reduce Background
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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 14

Higgs Search Strategy

WH → lbb

W

  • II. Reduce Background (continued)

Identifying b-jets (b

b-tagging b-tagging

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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 15

Higgs Search Strategy

  • WH → lbb ZH → bb

WH/ZHVH

  • III. Employ Multivariate Techniques
  • WW/WZ
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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 16

Combination of H → W+W– Searches

  • 162–166 GeV/c2 @ 95% CL

(expected exclusion range 159–169 GeV/c2)

  • ~5 fb-1

mH = 165 GeV/c2:

  • CDF + DØ Combined
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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 17

Standard Model Higgs Combination

  • ~
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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 18

b

tan(), tan2()

BSM Higgs – A Brief Primer

  • In the Minimal SUSY Model (MSSM):
  • h H A
  • H+ H–

mAtan()

  • In Two-Higgs Doublet Model

extensions to the SM:

hH: sin()Hcos()h

/2

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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches

bb ~ 90% ~ 10% b → b → b b b ( = h, H, or A) b → b

b

  • 19

MSSM Higgs Searches

Similar overall sensitivities

  • +–
  • (large background)

(more distinct signature)

tan() ~ 30,

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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 20

Fermiophobic Higgs

gg → H→ H → bb

  • Many other analyses: nMSSM, Charged Higgs, ...
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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 21

Constraints on 4th-Generation Fermion Models

  • gg H
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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 22

Tevatron Projections

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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 23

Tevatron Projections

Delivered luminosity now ~8.5 fb-1 Tevatron will deliver 10–12 fb-1 per experiment by end of 2011

(per experiment)

e b

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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 24

Tevatron Projections

Sensitivity to SM Higgs with 10 fb-1 per experiment

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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 25

How sensitive are we to the Standard Model Higgs?

Tevatron Projections

~

  • 100 GeV/c2

180 GeV/c2

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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 26

How sensitive are we to the Standard Model Higgs?

Tevatron Projections

~

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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 27

Conclusions

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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 28

Acknowledgments

  • Leo Bellantoni

Doug Benjamin Karen Bland Massimo Casarsa Jeannie Dittmann Frank Filthaut Wade Fisher Martin Frank Herbert Greenlee Craig Group Chris Hays Matt Herndon Sam Hewamanage Eric James Bo Jayatilaka Sergo Jindariani Tom Junk

  • Aurelio Juste

Ben Kilminster Jaco Konigsberg Nils Krumnack Mark Kruse Fabrizio Margaroli Krisztian Peters Rob Roser Richard St. Denis Shalhout Shalhout Giovanni Tassielli Miguel Vidal Song-Ming Wang Homer Wolfe Zhenbin Wu Weiming Yao Taka Yasuda

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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 29

Backup Slides

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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 30

The Fermilab Tevatron

Proton-antiproton collisions at 1.96 TeV Run 2 started in March 2001 Delivered luminosity now ~8.5 fb-1 Projection ~10–12 fb-1 by end of 2011

  • (per experiment)
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Jay R. Dittmann / Baylor Fermilab Users’ Meeting – June 2–3, 2010 Tevatron SM & BSM Higgs Searches 31

The CDF and DØ Experiments

The CDF Experiment

  • Silicon Tracker
  • Open-Cell Drift Tracker
  • Solenoid magnet
  • EM and Hadron calorimeters
  • Muon chambers

The DØ Experiment

Silicon Tracker Fiber Tracker Solenoid magnet LAr/DU Calorimeter Muon chambers

e

  • ~