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Tim Head - EPFL NIPS
December 2015
Data
Science
at LHCb
The
Large
Hadron

Collider© CERN
This is the right
time:
Dark Matter,
stuff vs anti-stuff
New Physics 101
6
How many
are there?
Who ya
gonna call?
Cherenkov -
faster than
the speed
of light
"PolarplotofChrenkovphotonsemissionangles"byReculetCCBY-SA3.0
How many
are there?
What else
does the
LHC
produce?
Simulation
By Joel Holdsworth (Joelholdsworth) CC-BY-SA-3.0
Simulate
all the
things
Simulate
all the
things#hard
What else
does the
LHC
produce?
Discard events
as early as
possible
Real Time
Stream
Processing
“Real” Time
Stream
Processing
The
Topological
Trigger
General purpose
Robust
Fast
Gligorov, Wiliams, arXiv:1210.6861
“I’ve mostly figured out what the
BDT does. In easy regions it does
easy to understand things and in
hard regions it does hard to
understand things.”
The
Topological
Trigger
General purpose
Robust
Fast
Old
Gligorov, Wiliams, arXiv:1210.6861
The
Final
Selection
This is where kaggle starts
The
Final
Selection
Advanced
techniques
Performance!!
Power
Users
What is it doing?
Normal People
Simplicity
Artisans NuPECC REPORT 1997
Uniformity, or other
special loss functions
Niche needs
Artisans
The
Final
Selection
Building Models
M
Classifier Keep
Discard
The
Known
Unknowns
Publish!
CMS and LHCb collaborations, doi:10.1038/nature14474, arXiv:1411.4413
Learn the decision
function of the
whole LHCb trigger
Preempting the
Trigger
No work
is faster than
some work.
Preempting the
Trigger
Preempting the
Trigger
Benbouzid, Busa-Fekete, Kegl, arXiv:1206.6387
Simulation is the largest
user of CPU time!
Generative Models
Reconstruction
Extracting properties
Track Finding
Details matter
??!
Tim Head
thead@cern.ch
@betatim

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Data Science at LHCb