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Carlos A. Chavez Barajas
22nd, May 2013
Latest work :
• Data Analysis• Non-collision background estimation (SUSY searches) • W+Jets cross section (data driven Top bkg estimation)
• Trigger• Operations (on-call activities, and online work)• Software (developments and management)
2Data Analysis
• Estimation of non-collision background– SUSY searches:
• Hadronic inclusive (0-lepton analysis) • Monojet analysis
position of the muon segments in the CSC and the inner MDT endcaps (unpaired bunches)
JHEP 1304 (2013) 075
PLB 710 (2012) 67
Monojet AnalysisLowest threshold signal region
Algorithms combines muon timing information with calorimeter energy clusters position.Efficiencies typically 20-50 %
3Data Analysis
• W+Jets Cross section measurement (2011 data)– Test of pQCD– Background to Higgs and new physics– Extreme phase space test of MC predictions
• Many jets (6,7,8) in final state
• Data driven Top background estimation
Select a ‘pure’ ttbar sample by requiring events with one or two b-jets
studied Top mass and MET variables
Transverse Sphericity as independent variablefor template normalization
PRD 85 (2012) 092002
4Trigger Work
• Trigger Online Operations (On-call duties)– Trigger Online expert & Trigger Menu expert
• Monitoring and diagnosing of problems during data-taking • Need to take immediate actions with problems found online • Need to have extensive knowledge of Trigger menus and
configuration as well as the tools that handle these:– Preparation of trigger configuration for online running
– TriggerMenuPython – Prescale sets for different lumi scenarios
– TriggerRuleBook– Handle interface to Trigger Database for configuration and prescales
– TriggerTool
5ATLAS High Level Trigger
Dataflow
CTP decision & RoI address
RoI BuilderRoI Builder
L2 Supervisor (L2SV)
L2 Supervisor (L2SV)
L2 Processing Units (L2PUs)L2 Processing Units (L2PUs)
RODROD RODROD RODROD
ROBROBROBROB ROBROB
ReadOut System (ROS)
MuMu CaloCalo SiSi Detector Front-End
RoI R
eque
st
RoI D
ata
Data Flow Manager (DFM)
Data Flow Manager (DFM)
L2 Result
EF Processing Units (EFPUs)EF Processing Units (EFPUs)
Sub-Farm Input (SFI)Sub-Farm Input (SFI)
Sub-Farm Output (SFO)Sub-Farm Output (SFO)
HLT
6
Dataflow
CTP decision & RoI address
RoI Builder
L2 Supervisor (L2SV)
L2 Processing Units (L2PUs)
ROD ROD ROD
ROB ROB ROB
ReadOut System (ROS)
Mu Calo Si Detector Front-End
RoI R
eque
st
RoI D
ata
Data Flow Manager (DFM)
L2 Result
EF Processing Units (EFPUs)
Sub-Farm Input (SFI)
Sub-Farm Output (SFO)
HLT
X
XXX X
X X
X
ATLAS High Level Trigger
7Trigger Work
• Trigger Online Operations (On-call duties)– High Level Trigger release coordinator
• Responsible for online software deployments and testing• Needs to make sure that online software releases are free of bugs
• Required to have extensive knowledge of ATLAS software management systems
– NICOS System (nightly builds) http://atlas-computing.web.cern.ch/atlas-computing/links/distDirectory/nightlies/global/
– Trigger Release software installations Offline and Online at Point 1 – TagCollector system (handles all different software projects)
8Trigger Work
• Trigger Integration group – Responsible for maintaining software testing infrastructure for online
releases• ATN (Atlas Nightly Tests) and RTT (Run Time Tester) tests
– For High Level Trigger releases – http://atlas-computing.web.cern.ch/atlas-computing/links/distDirectory/nightlies/glob
al/
• Trigger Core Software group– Trigger configuration tool TriggerTool
• Interface to Trigger database• Needs optimization, already to slow when uploading new Menus and
configurations to DB• started working on implementing/redesigning
– To include future changes during LS1, L2-EF merging, new BunchGroup sets
• Online shifter training responsibilities– I trained Trigger shifters for control room activities from 2010
9Overview of Research
• I have demonstrated crucial involvement in Trigger operations• Quickly became part of approximately 5 online trigger experts• I played a central role managing and developing trigger software
• I have valuable experience with hardware and software• Developing and leading trigger software projects • Building and testing T2K calorimeters on time for installation• Collaborating well with group of people and ability to co-ordinate
– Data Quality Coordinator in BABAR
• Wide physics data analysis experience• SUSY searches and SM measurements in ATLAS• B and Charm physics from BABAR experiment
• ATLAS has a very exciting LS1 upgrade program and beyond• I am very keen on playing a central role in this program• I feel I can contribute effectively and make it a success
Carlos A. Chavez Barajas (CERN) 12
BABAR Experiment
• Branching Ratio measurement of B0->π0π0 =(2.1±0.6±0.3)x10-6
• Time integrated CP asymmetry Cπ0π0=(B0-B0)/(B0+B0) =-1.12±0.56±0.06
• Charmless two-body group – I provided and validated reduced datasets for several BF and CP-
asymmetry measurements– BR and Direct CP-asymmetry in B0->Kπ
• Constraining CKM angle α with BR and CP-asymmetries in B->ππ using Isospin relations
D0-D0 mixing (BaBar)• Mixing is characterized by the parameters : x (ΔM) , y (ΔΓ) • By measuring the lifetime ratio CP even and CP-odd final states
and assuming CP-conservation the mixing parameter y = yCP:• D* tagged sample and untagged sample
2006 Babar Data Quality Coordinator (for one year)
Carlos A. Chavez Barajas (CERN) 15
T2K Ecal construction
• 4 Electromagnetic Barrel modules – Plastic scintillator and lead, optic fibers , MPPCs– Module dimensions approximately 2m X 4m
• During construction we carried out automatic radioactive source scans to measure light attenuation in the optic fibers, and validated the integrity of the detector
• Collaborating with several UK universities (including Warwick)• Several undergraduate, masters and PhD students involved in
the construction.