The High-Energy Frontier

Meenakshi Narain

For the BU High Energy Experimental Groups:

g-2Super-KDzeroAtlasCMS

The Standard Model

t bc s spin 1/2

W+W+

strong force ggweak force Z0Z0

electromagnetism W-W- spin 1

H spin 0Higgs

e e u dleptons quarks

The D0 ExperimentFermilab• Group

– Faculty:• J. Butler, • U. Heintz, • M. Narain

– Students: • S. Fatakia, • K. Black, • L. Felligioni• S. Rappocio, • Y. Kratsnisky

The D0 experiment

5000 tons400 physicistsRun I: 1992-1996100 pb-1

80 publications100 Ph.D.s

muon detector

calorimeter

tracker

• Proton-antiproton collisions– Ecom = 2 TeV

– highest Ecom !

• Top quark (discovery)• W and Z bosons (precision

measurements)• Physics beyond SM• Search for

– Higgs

– Supersymmetry

– Technicolor

– others

silicon detector

b

800,000 channels10 m hit resolution

1 m

B(b + X) 20% detect muons1

2 life time 1.5 ps c 0.5 mm

0.5 mm

precise tracking silicon microstrip detectors

topHiggsSUSY

Technicolor

What are we doing?

• Trigger Electronics– interaction rate: 2 MHz

– max readout rate: 50 Hz

– recognize interesting events online

• muon trigger• silicon trigger• state-of-the-art, high-speed digital

electronics

The Super-K/K2K Experiments• Group:

– Faculty: • E. Kearns, L. Sulak, J. Stone

– Postdoctoral fellows:• A. Habig, K. Scholberg, C. Walter

– Students:• S. Desai, M. Earl, S. Rich, C. Orth

Super-Kamiokande

updown

The g-2 Experiment

• Group

The g-2 Experiment

• Due to its magnetic moment

• a muon precesses in a magnetic field

• a precise measurement of g is sensitive to – internal structure of muon – new heavy particles that interact with the muon

Sme

gs

2

Bme

g2

The g-2 Experiment

Brookhaven

• Proton-proton collisions at 14 TeV

• probe SM in new energy regime

Higgs ATLASATLAS

CMSCMS

The Large Hadron Collider

The ATLAS Detector

ATLAS Muon Chambers

ATLAS Electronics

Endcap chamber

Electronics stackMezzanine board

Hedgehog board

ASD Chips

All being built at BU and Harvard.

CMS