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Searching for the Higgs – spearheading grid
Tara Shears
University of Liverpool
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Particle physics
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WEAKELECTROMAGNETICSTRONG
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What is mass?
…property mediated by “Higgs Particle”
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AnalogyInteraction with Higgs field ( mass) ~ movement of body through medium
Light particles do not interact much (move fast)
More interaction – slower movement – more mass conferred
Heaviest particles …. most interaction
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What is mass?
…property mediated by “Higgs Particle”
nb …… we haven’t seen it yet …..
???
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Looking for Higgs - LHCWorld’s most powerful particle accelerator
2 beams of protons collide 40 million x a second
4 large experiments
Due to start in 2007
27 km
?
?
?
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aside: LHC vs. circle line
LHC Circle line
Length 27km 22.5km
Depth 100m 15m
Diameter 3.8m 3.4m
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Looking for Higgs - experiment
eg. …the ATLAS experiment:
5 storey building 7,000 tonnes 42m long 22m wide 22m high2,000 Physicists 150 Institutes 34 Countries
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Starting from this event…
We look for this “signature”Selectivity: 1 in 1013
Like looking for 1 person in a thousand world populations
Or for a needle in 20 million haystacks!
Finding Higgs• 800,000,000 proton-
proton interactions per second
• ~100,000,000 electronic channels
• 0.0002 Higgs per second
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HOW do we find the Higgs?
Distributed Computing Solution – Grid
Concorde(15 Km)
Balloon(30 Km)
CD stack with1 year LHC data!(~ 20 Km)
Mt. Blanc(4.8 Km)
…. a needle in 20 million haystacks!
LHC produces enough data to fill 14 million cds / year (1,000,000 times world annual book production!!)
Estimated we need 100,000 computers to analyse it all …..
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grid!
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summarySearch for origin of mass and Higgs major unanswered question
Hope for discovery at LHC
Immense technological and computing challenge: grid!