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Transcript of 1 Chasing the Higgs boson with a worldwide distributed trigger system Sander Klous NIKHEF VENI...
1
Chasing the Higgs boson with a worldwide distributed
trigger system
Sander Klous
NIKHEF
VENI proposal 2006
4
quarks
leptons
The Standard Model
Electromagnetism Weak nuclear force Strong force
Higgs Boson
Present predictions:
About 100 x heavier than proton
Very unstable Predominant decay
to bottom quarks
upcharm
down
top
strange
bottom
neutrinostau
muonelectronP
articles
Forces
6
Radiating top quarks
40 million events per second A few hundred signal events per year
PROTON
PROTON
COLLISIONHIGGS
TOP
TOP
with lepton
with b quarks
particle jets
particle jets
particle jets
Time
7
Data processing: Triggers and Filters
• Standard ATLAS approach• Just a small signal expected
in 2009/2010• We can do much better…
Physics streams40 MHz
Level 1
Level 2
Accept 1 in 500
Accept 1 in 10
Level 3
Accept 1 in 50
8
PROTON
PROTON
COLLISIONHIGGS
TOP
TOP
with lepton
with b quarks
particle jets
particle jets
particle jets
Fully hadronic decays
9
Physics streams40 MHz
Level 1
Level 2
Accept 1 in 500
Amsterdam
NIKHEF/SARA
Accept 1 in 50
Data processing: Triggers and Filters
Accept 1 in 10
Level 3
Computing grid
Networkswitch
10
Project requirements
Big network switch A few computers on site Technical assistance
Data-Analysis
And B-physics
Trigger experience
Funding
Distributed computing
PhD thesisPostdoc
Involved in VL-e and in Tier-1 activities.