India-based Neutrino Observatory (INO) fileLifting the hierarchy-d CP degeneracy Current generation...
Transcript of India-based Neutrino Observatory (INO) fileLifting the hierarchy-d CP degeneracy Current generation...
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Sushant Raut
Physical Research Laboratory (PRL), Ahmedabad
for the INO Collaboration
India-based Neutrino Observatory (INO)
...an indirect boost to CP sensitivity
VietNus 2012: Towards CP Violation in Neutrino Oscillations
Qui Nhon, December 2012
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Outline
Motivation: INO CP Violation Requirements for measuring CP
INO: Details Physics aims
Detector and simulations
Current status
INO: Physics potential Precision measurements
Mass hierarchy measurement
Octant measurement
Towards CP measurement?
Summary
Sushant Raut, VietNus 2012
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Outline
Motivation: INO CP Violation Requirements for measuring CP
INO: Details Physics aims
Detector and simulations
Current status
INO: Physics potential Precision measurements
Mass hierarchy measurement
Octant measurement
Towards CP measurement?
Summary
Sushant Raut, VietNus 2012
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Q: Why should we discuss atmospheric
neutrinos at a workshop on CP Violation?
Sushant Raut, VietNus 2012
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Q: Why should we discuss atmospheric
neutrinos at a workshop on CP Violation?
Sushant Raut, VietNus 2012
Currently unknown oscillation parameters:
Mass hierarchy
dCP
Octant of q23
Hierarchy-dCP degeneracy:
P(NH, dCP ) = P(IH, dCP’)
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Towards CPV discovery
Huber, Lindner, Schwetz, Winter: 0907.1896
Q: What can we say about dCP, using data from
existing/upcoming long baseline facilities?
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Measuring dCP
Prakash, SR, Uma Sankar: 1201.6485
Sushant Raut, VietNus 2012
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Measuring dCP
Prakash, SR, Uma Sankar: 1201.6485
Need to know the hierarchy first,
in order to measure dCP! Sushant Raut, VietNus 2012
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Lifting the hierarchy-dCP degeneracy
Current generation LBL
Small matter effects
(with current/upcoming facilities)
Sushant Raut, VietNus 2012
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Lifting the hierarchy-dCP degeneracy
Current generation LBL
Small matter effects
Combining data
from various LBLs
extensive literature...
(with current/upcoming facilities)
Sushant Raut, VietNus 2012
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Lifting the hierarchy-dCP degeneracy
Thomas: GLADE proposal;
Agarwalla, Prakash, SR, Uma Sankar: 1208.3644
Current generation LBL
Small matter effects
Combining data
from various LBLs
extensive literature...
Additional detector
modules (hence
higher statistics)
(with current/upcoming facilities)
Sushant Raut, VietNus 2012
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Lifting the hierarchy-dCP degeneracy
Thomas: GLADE proposal;
Agarwalla, Prakash, SR, Uma Sankar: 1208.3644
Gandhi et al: 0707.1723;
Blennow, Schwetz: 1203.3388;
Ghosh, Thakore, Choubey: 1212.1305
Current generation LBL
Larger matter effects
Atmospheric
neutrinos
Small matter effects
Combining data
from various LBLs
extensive literature...
Additional detector
modules (hence
higher statistics)
Wide range
of L,E
INO
(with current/upcoming facilities)
Sushant Raut, VietNus 2012
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Outline
Motivation: INO CP Violation Requirements for measuring CP
INO: Details Physics aims
Detector and simulations
Current status
INO: Physics potential Precision measurements
Mass hierarchy measurement
Octant measurement
Towards CP measurement?
Summary
Sushant Raut, VietNus 2012
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INO:
India-based Neutrino Observatory
Ahmedabad: Physical Research Lab
Aligarh: Aligarh Muslim Univ
Allahabad: Harish-Chandra Research Inst
Calicut: Univ of Calicut
Chandigarh: Panjab Univ
Chennai: IIT Madras, Inst of Mathematical Sciences
Delhi: Univ of Delhi
Guwahati: IIT Guwahati
Hawaii: Univ of Hawaii
Indore: IIT Indore
Jammu: Univ of Jammu
Kalpakkam: Indira Gandhi Centre for Atomic Research
Kolkata: Ramakrishna Mission Vivekananda Univ, Saha Inst of Nuclear Physics, Variable Energy Cyclotron Centre, Univ of Calcutta
Lucknow: Lucknow Univ
Madurai: American College
Mumbai: Bhabha Atomic Research Centre, IIT Bombay, Tata Inst of Fundamental Research
Mysore: Univ of Mysore
Sambalpur: Sambalpur Univ
Srinagar: Univ of Kashmir
Varanasi: Banaras Hindu Univ
http://www.ino.tifr.res.in/ino/
Collaborators are welcome!
Sushant Raut, VietNus 2012
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Physics Aims of INO
Detection of atmospheric neutrinos: wide range of L,E
Iron Calorimeter (ICAL) with charge-id (magnetization), for nu-antinu separation
Precision measurement of atmospheric parameters
Mass hierarchy determination
NSI, CPT violation, NDBD, ultra high energy muons, etc.
Stage I: Atmospheric neutrino observatory
Stage II: Detector for a future long baseline experiment??
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Location of INO Bodi West Hills, Pottipuram
village, Theni district, Tamil
Nadu state
( 9o 58’ N, 77o 16’ E)
120 km west of Madurai town
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The INO site
Vertical cover :1289 m; all-round cover: ~1000 m
Four caverns: Accessible through a 2 km tunnel
Cavern 1: 50 kt ICAL (space for 100 kt)
Caverns 2-4: Available for other experiments: NDBD,
DM, etc.
Underground cavern and tunnel, small surface lab at
Pottipuram (outside the reserve forest boundary)
Sushant Raut, VietNus 2012
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Construction updates
INO project approved ‘in principle’ by Indian funding
agencies
Environment and forest clearance obtained
Tendering for site preparation in progress
Pre-project works (approach roads, water supply,
electricity connections) have begun
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Detector factsheet
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The ICAL Detector
Iron plates (target mass) separated by glass RPCs (active
detector): 150 layers
Magnetization: Charge-id through bending of muons
Directionality through tracking and timing (1 ns resolution)
Modular structure,
for ease of
construction and
modification
Front end electronics
chip developed at
BARC Electronics
Division
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Detector updates
Timing resolution, noise, tracking, etc of RPC being tested with cosmic muons
RPC R&D almost complete. 2m x 2m RPCs being fabricated by the industry. 40 kt prototype tested in Kolkata. Both glass and bakelite RPCs tested.
Electronics: Design and prototyping going on, ASIC front end being tested in RPC lab
Magnetization: Prototype magnet running at VECC
Sushant Raut, VietNus 2012
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Simulation framework
Sushant Raut, VietNus 2012
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Simulation Updates
Inhomogenous magnetic field map implemented
Muon reconstruction: Energy and direction resolutions available, but efforts are on to improve them
Hadron reconstruction: Energy resolutions available
Neutrino energy resolution using muon and hadron momenta
Sushant Raut, VietNus 2012
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Detector efficiency
Sushant Raut, VietNus 2012
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Detector resolution
Sushant Raut, VietNus 2012
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More work required
Detector effects
Improving sensitivity to electrons
Improving angular resolution of neutrinos by more precise direction reconstruction for hadrons
Lowering the energy threshold
Improving resolution/efficiency for horizontal events
Other systematic effects:
Flux normalization uncertainty
Flux tilt uncertainty
Cross-section uncertainty
Sushant Raut, VietNus 2012
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Outline
Motivation: INO CP Violation Requirements for measuring CP
INO: Details Physics aims
Detector and simulations
Current status
INO: Physics potential Precision measurements
Mass hierarchy measurement
Octant measurement
Towards CP measurement?
Summary
Sushant Raut, VietNus 2012
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Precision measurements
(with projected priors on atmospheric parameters) Sushant Raut, VietNus 2012
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Mass hierarchy determination Impact of resolutions
Gandhi et al: 0707.1723;
Also see
Petcov, Schwetz: hep-ph/0511277 Sushant Raut, VietNus 2012
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Mass hierarchy timeline: INO
Sushant Raut, VietNus 2012
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Mass hierarchy timeline: INO+others
Sushant Raut, VietNus 2012
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Mass hierarchy determination
Impact of systematics and priors
20-30% drop in sensitivity due to systematics
Further 20-30% drop due to parameter uncertainties Sushant Raut, VietNus 2012
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Comparison & Combination
INO
10 years data
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Outline
Motivation: INO CP Violation Requirements for measuring CP
INO: Details Physics aims
Detector and simulations
Current status
INO: Physics potential Precision measurements
Mass hierarchy measurement
Octant measurement
Towards CP measurement?
Summary
Sushant Raut, VietNus 2012
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Sushant Raut, VietNus 2012
Q: Why should we discuss atmospheric
neutrinos at a workshop on CP Violation?
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Measuring dCP requires knowledge of the hierarchy
With current LBL experiments, hierarchy sensitivity depends significantly on the value of dCP
Atmospheric neutrino experiments (in particular INO) can determine hierarchy independently of dCP
Combining with other experiments improves the sensitivity
Sushant Raut, VietNus 2012
Q: Why should we discuss atmospheric
neutrinos at a workshop on CP Violation?
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Summary: INO Experiment
Land acquired, civil construction to start soon
RPC testing going on
Improvements expected in energy and angular
resolutions through simulations
Data taking expected to start around 2017.
Sushant Raut, VietNus 2012
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THANK YOU
Thanks to Sandhya Choubey, Brajesh Choudhary, Amol Dighe, Anushree Ghosh,
Pomita Ghoshal, Srubabati Goswami, Naba Mondal, M.V.N.Murthy and Tarak Thakore
for their inputs.
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BACKUP SLIDES
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Atmospheric neutrino flux at Theni
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INO Cavern
Cavern 1
Access tunnel
Auxiliary tunnel
Cavern 2
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Mass hierarchy determination
Impact of dCP
Gandhi et al: 0707.1723 Sushant Raut, VietNus 2012
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Mass hierarchy timeline: INO+others
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RPC
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Dighe: NuFact 2012 Sushant Raut, VietNus 2012
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Testing RPCs using cosmic rays
Timing resolution
Pulse height resolution
Tracking capability for muons and hadrons
Noise rate
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INO Timeline
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