4/1/2005 U. Heintz - BU Open House 1

High Energy Physics Experiment at

Boston University

Ulrich Heintz

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What is our world made of?

e νe

µ νµ

τ ντ

u d

c s

t b

γ

H

gZW

leptons quarks

gauge bosonsHiggs boson

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What is our world made of?

e νe

µ νµ

τ ντ

u d

c s

t b

γ

H

gZW

leptons quarks

gauge bosonsHiggs boson

precision muon physicsProf. CareyProf. MillerProf. Roberts

precision precision muonmuon physicsphysicsProf. CareyProf. CareyProf. MillerProf. MillerProf. RobertsProf. Roberts

Neutrino physicsProf. KearnsProf. StoneProf. Sulak

Neutrino physicsNeutrino physicsProf. KearnsProf. KearnsProf. StoneProf. StoneProf. SulakProf. Sulak

Hadron Collider PhysicsProf. AhlenProf. ButlerProf. HeintzProf. NarainProf. RohlfProf. SulakProf. Whitaker

HadronHadron ColliderCollider PhysicsPhysicsProf. AhlenProf. AhlenProf. ButlerProf. ButlerProf. HeintzProf. HeintzProf. NarainProf. NarainProf. RohlfProf. RohlfProf. SulakProf. SulakProf. WhitakerProf. Whitaker

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What is our world made of?

precision muon physicsProf. CareyProf. MillerProf. Roberts

precision precision muonmuon physicsphysicsProf. CareyProf. CareyProf. MillerProf. MillerProf. RobertsProf. Roberts

Neutrino physicsProf. KearnsProf. StoneProf. Sulak

Neutrino physicsNeutrino physicsProf. KearnsProf. KearnsProf. StoneProf. StoneProf. SulakProf. Sulak

Hadron Collider PhysicsProf. AhlenProf. ButlerProf. HeintzProf. NarainProf. RohlfProf. SulakProf. Whitaker

HadronHadron ColliderCollider PhysicsPhysicsProf. AhlenProf. AhlenProf. ButlerProf. ButlerProf. HeintzProf. HeintzProf. NarainProf. NarainProf. RohlfProf. RohlfProf. SulakProf. SulakProf. WhitakerProf. Whitaker

Supersymmetry

Higgs

Technicolor

extradimensions

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collaborations without borders

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world class infrastructure• Electronics Design

Facility• Scientific Instrument

Facility

as a student you acquire many marketable skills in cutting edge electronics, computing and software engineering

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Precision Muon Physics at Boston University

Collaborations where everyone knows your name

Professors: Carey, Miller, Roberts

Postdocs: Lynch, Gafarov, Logashenko

Students: Huang, Peng + two new students

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g-factor of the muon• g-factor relates magnetic moment and spin

– QED â g=2– but it’s not exactly 2…– sensitive to all particles

that couple to the muon

hs

gB

rr=

µµ

1010)6(11659208

2

−×=

=−B

mce

gω differs by 2.7σ

from standard model

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g-factor of the muon

• With a 2.7 σ discrepancy, you’ve got to go further.

• E969 received highest scientific approval from Brookhaven– Possible timescale is the next four years

• Goal: total error = 0.2 ppm– lower systematic errors– more beam

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muon to electron conversion: MECO

Muon Beam Stop

Straw Tracker

Crystal Calorimeter

Muon Stopping Target

Superconducting Production Solenoid

(5.0 T – 2.5 T)

Superconducting Detector Solenoid

(2.0 T – 1.0 T)

Superconducting Transport Solenoid

(2.5 T – 2.1 T)

Collimators

p beam 10-17 BR single event sensitivity

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muon lifetime: µLan

• Several ppm measurement is imminent

• 1 ppm in the next few years– come join us and make it happen

Paul Scherrer Institut (Switzerland)• measure weak coupling strength

GF 20 times better

world’s largest research-grade soccer ball

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Neutrino & Particle Astrophysics

Collaborations where everyone knows your name

Professors: Kearns, Stone, Sulak

Students: Clark, Desai (recently graduated) Dufour, Litos, Wang

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Super-K• 50 kton water Cerenkov detector• in zinc mine in the Japanese Alps

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neutrinos have mass!

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current work at Super-K

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Tokai to Kamiokande: T2K

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Hadron Collider PhysicsThe DØ Experiment

Professors: Butler, Heintz, Narain

Postdocs: Cho, Kalathyan, Kasper

Students: Black*, Boline, Das, Fatakia*, Feligioni

*just graduated

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Fermilab Tevatron• proton-antiproton collisions at ¼ 2 TeV• operating now until ¼ 2009

2 km

CDF DØ

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DØ detector

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DØ detector• muon trigger electronics

– important tag for lots of physics

– b physics– top– Higgs– …

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DØ detector• muon trigger electronics

• silicon track trigger– trigger on b-quarks– top– Higgs

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DØ detector• muon trigger electronics

• silicon track trigger

• level 1 track trigger– make DØ ready for higher beam intensities

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d

s

u

c

b

t

top quark• discovered in 1995

– Butler, Narain, Heintz and 300 of our friends– huge mass

• 20 times that of the b-quark• about the same as a Gold

atom

• study its properties

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Fermilab result of the week

• mtop = 170.6 § 7.3 GeV/c2

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search for new particles• Higgs

– can see it if mass < 130 GeV– H à b anti-b

• Technicolor– new strong interaction – new composite particles – mass ¼ 100 GeV – 1 TeV

• many other topics…

q

q

±Tρ

±W

±W

Tπb

b

νe

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Bs mixing• particle-antiparticle oscillations

– first observed with Kaons– also happens with B-mesons– Bs oscillations can only be found at Fermilab

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Hadron Collider PhysicsThe Large Hadron Collider

ATLAS:Professors: Ahlen, Butler, Heintz, Narain, WhitakerSenior Scientists: Marin, Shank, YoussefStudents: Nation

CMS:Professors: Rohlf, SulakPostdocs: Varela

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Large Hadron Collider

CMS

Alice

ATLAS

LHCb

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LHC• 26 km of superconducting magnets• first collisions in 2007• proton-proton collisions at 14 TeV

– new energy regime

• Higgs boson:– find it or rule it out

• What is there beyond the standard model?– some new physics has to appear at these energies

• How many Nobel prizes?– be part of it

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detectors: ATLAS and CMS

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ATLAS• A Toroidal Large hadron collider AparatuS• muon detection system

– superconducting aircore toroids– barrel muon chambers (about 1000 chambers)– endcap muon chambers (made in USA)

• 80 in Boston, 80 in Michigan, 80 in Seattle– resolution: 80 microns for each of 20 layers of wires

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ATLAS

• identify and determine momentum of muons– Higgs – supersymmetry

• Boston University/Harvard will be a computing center

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CMS• Compact Muon Solenoid

– electronics for hadron calorimeter – calibration– detector control system– high-level jet and missing energy trigger– physics coodination

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Conclusion• high energy physics is entering an exciting

era– Boston University has a broad program that

pushes the envelope • in precision measurements• in neutrino physics• at the energy frontier

– lots of thesis projects for students

JOIN US!