1. Institute of High Energy Physics, Beijing
Working report ( )
Miao He
Institute of High Energy Physics, Beijing

2. Simulation & reconstruction
Resume
Experiences
Tsinghua University, Bachelor
IHEP, PhD
IHEP, Postdoc
, IHEP, Assistant researcher
, IHEP, Associate researcher
Researches
Simulation & reconstruction
BESIII
BEIIE-II
This report
Daya Bay
Physics & offline
JUNO
Reconstruction
MOMENT
Physics and det
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2014/11/21

3. Daya Bay physics analysis
Continue organizing physics analysis as the co-coordinator.
Served in the Analysis Coordination Committee (ACC) since Jan 2013
Finished the oscillation analysis with full detector configuration.
Organized the analysis of IHEP group (see detail in the next pages)
Coordinated analysis comparison between different groups
Pushed reactor flux and spectrum analysis. IHEP analysis group made significant contribution.
Independent analysis of the absolute reactor flux.
Independent analysis of the positron spectrum comparison between the measurement and the prediction.
Independent analysis of the spectrum unfolding and the generic antineutrino spectrum.
Other jobs of ACC such as organization of analysis workshops, review of conference talks and proceedings.
2014/11/21

4. Oscillation analysis Experiment overview
First data analysis with the full detector configuration: 6 AD → 6+8 AD
×3.6 increase in total exposure by the end of 2013
Detector energy response and systematics
Improvement in energy reconstruction and relative energy scale: 0.35% → 0.2%
Improvement in absolute energy scale (nonlinearity): 1.5% → 0.7%
Side-by-side comparison with two new ADs and re-evaluation of systematics
Backgrounds
Removal of AmC sources at far site. AmC rate is decreasing. 0.2 → 0.05 (per day)
Model independent measurement of fast neutrons: 50% → ~22%
Evaluation of the systematics of α-n
θ13 analysis
A pure relative pull χ2 analysis with quantitative evaluation of bias and sensitivity
Study of time the dependence of reactor uncertainties: ~0.2σ effect
Bold: new contribution from IHEP group
2014/11/21

5. Highlights in the oscillation analysis
Improvement in the absolute energy model
Model independent measurement of fast neutron background
FADC measurement at IHEP/onsite
LS measurement at IHEP
RPC data was directly used in the analysis!
Improvement in the fitter
Improvement in the relative energy scale
Impact of reactor time dependence on Δm2
Impact of reactor model constrain on sin22θ13
2014/11/21

6. Analysis results Improvement in θ13: 10% → 5.6%
Improvement in m2ee: 8% → 4.5%
Results were released in June 2014
Assigned as the co-editor of this paper. Being reviewed by the publication committee. Plan to submit it to PRL by the end of 2014.
2014/11/21

7. Daya Bay offline system
In charge of budgeting and purchasing of offline equipment (supervised by Prof. LI Weidong and Prof. WANG Meng)
Drafted the budget for the CAS operation funding (2014) and attended the review meeting in May 2014
Drafted the interim summary report ( ) and the application form for the 973 funding ( )
New computing resources in the past year: 200TB disk array, 400TB tape, 256 CPU cores
In charge of offline software update and release
Maintaining of the auto building and testing system
Release NuWa-3.9.2: update simulation parameters
Release NuWa : update energy reconstruction
In charge of data production and management
Maintaining of the keep-up data production
Two physics production P13A/P14A, ~200,000 jobs, 240TB data volume
One MC production
Data storage: 100 TB on disk and 200 TB on tape per year
Served as the offline on-call
2014/11/21

8. Event reconstruction in JUNO
Defined reconstruction data model.
Developed a preliminary algorithm of muon tracking in the JUNO central detector.
Preliminary study on multiple muons (muon bundle) identification and short track reconstruction.
Wrote the reconstruction part for CDR and the yellow book.
Resolution of the track length
Hit pattern of multiple muons
2014/11/21

9. MC study of CP-violation in MOMENT
Worked as the co-convenor of the detector and physics working group of MOMENT: a muon-decay medium-baseline neutrino beam facility
Signal rate calculation (IBD and inclusive charge current)
Particle identification (investigation from other experiments) and background estimation
e/μ misidentification -> background
Charge misidentification -> background
Neutral current -> π0 background
Atmospheric background
CP sensitivity study
A χ2 fitting of the spectra distortion
CP sensitivity, statistical only
2014/11/21

10. Publications Title Journal Author Comment 1
Spectral Measurement of Electron Antineutrino Oscillation Amplitude and Frequency at Daya Bay
PRL 112, (2014)
Daya Bay collaboration 2
Future Reactor Experiments
NuFact2013 proceeding
corresponding author 3
Performance quality monitoring system for the Daya Bay reactor neutrino experiment
Chin. Phys. C 2014 38 (8): 086001 4
Muon-decay medium-baseline neutrino beam facility
PhysRevSTAB
Jun Cao, et al.
Wrote physics and detector sections 5
Electron antineutrino disappearance with the full detector configuration at Daya Bay
to be sub-mitted to PRL
co-editor
2014/11/21

11. Conference talks Neutrino physics and prospective CPS:HEP
Title
conference
Date
Place
Comment 1
Neutrino physics and prospective
CPS:HEP
18-23 APR, 2014
Wuhan
Plenary 2
Data processing and storage in the Daya Bay Reactor Antineutrino Experiment
ICHEP2014
2-9 JUL, 2014
Valencia, Spain
Parallel 3
Jiangmen Underground Neutrino Observatory
NOW2014
7-14 SEP, 2014
Conca Specchiulla, Italy
2014/11/21

12. Fundings
Title
conference
Date
Place
Comment 1
Study on massive neutrino properties with reactor antineutrinos in the Daya Bay and Daya Bay II experiment
NSFC- RFBR (China-Russia) cooperation funding
90,000 RMB
Leader 2
Young scientist founding
Chinese Academy of Sciences
400,000 RMB 3
Operation funding of the Daya Bay offline system
2,010,000 RMB
2014
Participant
2014/11/21

13. Working plans Continue physics analysis coordination in Daya Bay
Reactor spectrum analysis
Improvement of oscillation parameters
Cosmogenic studies
Operation and maintaining of the Daya Bay offline system
JUNO R&D
Study of the mixture PMT (20”+8”) approach: improve vertex and energy resolution; improve muon bundle identification
Improve muon tracking
Improve CP sensitivity study in MOMENT
Number of signals
Particle identification
Atmospheric neutrino backgrounds
New ideas
2014/11/21