ATLAS Collaboration 3000 Physicists including 1000 students.

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Presentation transcript:

ATLAS Collaboration 3000 Physicists including 1000 students

ATLAS Computing Development and reliance on the Grid Novel software that allows users to access computers distributed over the network Grid effectively turns a global network of computers into one vast computational resource

Fundamental Forces 3 3

Fundamental Forces Classically, forces arise as an interaction of a charge or mass with a field In quantum field theory, forces arise from the exchange of a (gauge) boson Electromagnetic electron photon Weak Z Strong quark gluon

Fundamental Particles asdf ??

Fundamental Particles 6

Fundamental Particles Or another pattern to unravel? 7

Standard Model Successes The Standard Model of particle physics is mathematically complete There are no significant experimental discrepancies with Standard Model predictions But no Higgs boson has been observed either 8

What is the Higgs Boson?

What is the Higgs Boson?

Standard Model Summary SSB and Massive Higgs Higgs Mechanism Boson Local Gauge Invariance Massive Gauge Bosons 11

Standard Model Standard Model Lagrangian

Where to Search for the Higgs Indirect constraints on the Higgs mass can be found by considering electroweak radiative corrections like 13

Higgs Production at the LHC Gluon Fusion (GGF) Dominant process Vector Boson Fusion (VBF) Second largest cross section Distinctive topology useful for small mH Associated W/Z (AW) Associated Top (AT) Interesting topologies but smaller cross section 14

Higgs Decay Modes The Standard Model rules say the Higgs decays into the heaviest pair of particles that is kinematically allowed 15

Higgs Decay Modes

Limit Plots Explained Limit plots

Hot Off the Press Results - ATLAS We definitely know where the Higgs is NOT hiding (excluded up to 486 GeV) And we have a hint (only) as to where it may be found 117.5-118.5 GeV 122.5-129 GeV

Hot Off the Press Results - ATLAS The ATLAS result comes from a combination of searches over many different decay channels 19

CMS Result Also see an excess in that region 20

Fermilab (CDF and D0) Results Also see an excess in that region 21

U. of Arizona’s Role Physicists Forward Muon (CSC) Electronics Integrated Forward Calorimeters Massive Forward Radiation Shield (~700 Metric Tons)

ATLAS Forward Calorimeter by UA Design and construction

ATLAS CSC (Electronics) by UA

Radiation Shield Design by UA Simulating and designing shielding to protect detectors and electronics

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