PC
L H C b farms
Farmers:
Chun-Min (Mindy) Jen &
Tomasz Skwarnicki
Syracuse U i
S University, NY US
it NY,
2/16/2009 Syracuse Uni.@LHCb by Mindy Jen 1
Tracking & Alignment Workshop

Perform simple monitoring checks on tracking algorithms run in Hlt,
based on information saved in Hlt Raw Data banks:
Do not rely on the ability to rerun Hlt in offline (and getting all the same
calibration and alignment constants)
Not intend to eliminate the latter, but to complement it
Need feedback from you:
We are not tracking experts
Will you find this kind of monitoring code useful?
What kind of other checks/plots would you like to see?
Your feedbacks are quite welcome!!!
2/16/2009 Syracuse Uni.@LHCb by Mindy Jen 2
Tracking & Alignment Workshop

We
W are interested i producing monitoring codes which can b run on
i d in di ii d hi h be
real data:
No MC truth information
Evaluate the trigger tracking with respect to offline tracks
Such codes could be run in:
Monitoring Farm (MF) t see th t th
M it i F to that there i nothing unexpected h
is thi t d happening i
i in
the Event Filtering Farm (EFF)
In the true offline processing after better alignment constants are found to
see hhow much worse on-line calibrations were
h li lib ti TriggerTisTos tool
Offline
HltObjectSummaries
Environment
Online Environment
RAW D t
Data “READ” TES classes:
Hlt RAW Banks
HltSelReports
HltDataSVC HltSelReports
E F F
HltDecReports
M F
HltDecReports
“WRITE”
WRITE HltVertexReports
HltVertexReports
2/16/2009 Syracuse Uni.@LHCb by Mindy Jen 3
Tracking & Alignment Workshop

HltSelReports Raw Bank and TES class contain relevant information
for tracks
We also use HltVertexReports when looking at the Impact Parameter
(IP) resolution
All reconstructed objects are saved as LHCb::HltObjectSummary class
For “tracks”, HltObjectSummary contains:
All LHCbIDs:
We use these via TriggerTisTos tool to match trigger- and off-line tracks
(more details later)
Numerical information:
on the FirstState in the single precision with no error matrices:
We use these to compare with offline FirstState values (more details later)
2/16/2009 Syracuse Uni.@LHCb by Mindy Jen 4
Tracking & Alignment Workshop

X , tx
StdInfo:
.firstState Y , ty
Track
LHCbIDs
LHCbID
X
Z , q/P
.position
RecVertex Y
.particleID.pid
particleID pid
Z
.measuredMass
X numericalInfo
Particle
.referencePoint
Y
.slopes How Large?
Z
1/.p
p
Single Tracks
Si l T k
Hlt1
SubStructure
RecVertex -- Multiple Tracks
H gh t
High Pt & H gh IP
High
Particles Proto-Particles
Proto Particles Tracks
Hlt2
2/16/2009 Syracuse Uni.@LHCb by Mindy Jen 5
Tracking & Alignment Workshop

In the default mode HltSelReports contains only candidates selected
by Hlt1 and Hlt2 Decision algorithms
Hlt Raw Data size ~2 kB ( 5% of total event size)
2 (~5%
We are working to see what can be accomplished from this information
alone, but not yet in position to show anything useful
Debug setting:
Can save outputs from intermediate Hlt algorithms registered with
HltDataSvc:
Right now limited to all Hlt1 algorithms but can be extended to Hlt2 in the
future
Includes general track reconstructions: RZVelo, Velo, Forward1
Can be run pre-scaled in co-existence with the default mode:
pre scaled co existence
No big penalty in data storage
Because of high trigger rate (2kHz) even heavy pre-scaling accumulates
debug events quickly
2/16/2009 Syracuse Uni.@LHCb by Mindy Jen 6
Tracking & Alignment Workshop

HltSelReports Raw Bank Size for “Forward1” & “StdInfo”
(Info Level = 1) saved in “debug” setting
Hlt Raw Data size ~8 5 kB
~8.5
(~21.25% of total event size)
KB KB
2/16/2009 Syracuse Uni.@LHCb by Mindy Jen 7
Tracking & Alignment Workshop

Today we will only show comparison between Hlt1 “Forward1” tracks
and type=3 (i.e. Long) offline tracks from Rec/Tracks/Best
Run on Minimum Bias events (DC06 data) and look only at events
passing Hlt2. Run on ~3k events (~1.5s of data without pre-scaling the
Debug mode).
g )
Use HltObjectSummaries() method of the TriggerTisTos tool to
obtain “TOS” trigger tracks for given offline tracks passed as “signal”:
TOS criteria encoded in the TriggerTisTos tool:
> 70% of hits on the trigger track must be among the offline-track hits.
This has to be satisfied separately for VELO (vertex locator), OT (outer
tracker) + IT ( inner tracker) and TT (tracker turicensis) (if any)
2/16/2009 Syracuse Uni.@LHCb by Mindy Jen 8
Tracking & Alignment Workshop

X X
Pt φ
Z Proton beam Proton beam Y Z
Transverse X-Y Plane
Transverse Momentum Pt
h/2 Azimuthal Scattering Angle φ
σ
2/16/2009 Syracuse Uni.@LHCb by Mindy Jen 9
Tracking & Alignment Workshop

Calculate IP with respect to a primary vertex (PV) using
HltUtils::impactParameter (RecVertex,Track)
Use primary vertices from HltVertexReports for ‘PV2D’
If more than one PV, choose the one that minimizes IP of the offline track.
Create LHCb::Track f
C t LHCb T k from the Fi tSt t i f on HltObj tS
th FirstState info HltObjectSummary tto
calculate IP of the trigger track with respect to the same PV.
M
Plot ΔIP = IPoffline-IPtrigger B
Z Hlt
N
Flight Distance
Secondary Vertex
X Y
B
hits
Impact Parameter ( )
(IP)
γ
μ ν
P P
Z
Primary Vertex (PV) ( PP Collision/Interaction Point )
2/16/2009 Syracuse Uni.@LHCb by Mindy Jen 10
W Tracking & Alignment Workshop

IPmin
Δ
IP
Primary Vertex (Collision Point)
Proton beam Proton beam
2/16/2009 Syracuse Uni.@LHCb by Mindy Jen 11
Tracking & Alignment Workshop

Δ
2/16/2009 Syracuse Uni.@LHCb by Mindy Jen 12
Tracking & Alignment Workshop

2/16/2009 Syracuse Uni.@LHCb by Mindy Jen 13
Tracking & Alignment Workshop

All Offline Tracks
With a Match to a
Trigger Track
ε of trigger tracking
2/16/2009 Syracuse Uni.@LHCb by Mindy Jen 14
Tracking & Alignment Workshop

With a Match
to a Trigger
All Offline
Track
Tracks
T k
ε of trigger tracking
2/16/2009 Syracuse Uni.@LHCb by Mindy Jen 15
Tracking & Alignment Workshop

All Offline Tracks
ε of trigger tracking
With a Match
to a Trigger Track
2/16/2009 Syracuse Uni.@LHCb by Mindy Jen 16
Tracking & Alignment Workshop

All Trigger Tracks
With a Match to
ε of offline tracking
an Offline Track
2/16/2009 Syracuse Uni.@LHCb by Mindy Jen 17
Tracking & Alignment Workshop

With a Match
to an Offline
All Trigger
Track
Tracks
T k
ε of offline tracking
2/16/2009 Syracuse Uni.@LHCb by Mindy Jen 18
Tracking & Alignment Workshop

With a M t h
Match
to an Offline
Track
ε of offline tracking
All Trigger
Tracks
2/16/2009 Syracuse Uni.@LHCb by Mindy Jen 19
Tracking & Alignment Workshop

Feedback welcome
About things to look at and way to
present
Would monitoring Velo (RZVelo)
with respect to offline tracks be
useful?
Should we use any cuts on offline
tracks before using them?
2/16/2009 Syracuse Uni.@LHCb by Mindy Jen 20
Tracking & Alignment Workshop