high energy physics experiment at boston universityhep.bu.edu/~kearns/openhouse/hee-05.pdf · 2005....
TRANSCRIPT
4/1/2005 U. Heintz - BU Open House 1
High Energy Physics Experiment at
Boston University
Ulrich Heintz
4/1/2005 U. Heintz - BU Open House 2
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
4/1/2005 U. Heintz - BU Open House 3
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
4/1/2005 U. Heintz - BU Open House 11
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– …
4/1/2005 U. Heintz - BU Open House 21
DØ detector• muon trigger electronics
• silicon track trigger– trigger on b-quarks– top– Higgs
4/1/2005 U. Heintz - BU Open House 22
DØ detector• muon trigger electronics
• silicon track trigger
• level 1 track trigger– make DØ ready for higher beam intensities
4/1/2005 U. Heintz - BU Open House 23
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
4/1/2005 U. Heintz - BU Open House 24
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
4/1/2005 U. Heintz - BU Open House 26
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!