THE RISE OF NOVA 1 Joao Coelho 13 July 2015 OUTLINE Neutrino - - PowerPoint PPT Presentation

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THE RISE OF NOVA 1 Joao Coelho 13 July 2015 OUTLINE Neutrino - - PowerPoint PPT Presentation

Apr 04, 2024 362 likes •1.04k views

Joao Coelho 13 July 2015 Joao Coelho For the NOvA Collaboration THE RISE OF NOVA 1 Joao Coelho 13 July 2015 OUTLINE Neutrino Oscillations NuMI Beam Bi-probability plot NOvA Experiment Numu Disappearance Nue Appearance

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SLIDE 1

THE RISE OF NOVA

Joao Coelho For the NOvA Collaboration

13 July 2015 Joao Coelho 1

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SLIDE 2

OUTLINE

  • Neutrino Oscillations
  • NuMI Beam
  • Bi-probability plot
  • NOvA Experiment
  • Numu Disappearance
  • Nue Appearance
  • What to expect

13 July 2015 Joao Coelho 2

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SLIDE 3

NEUTRINO OSCILLATION

13 July 2015 Joao Coelho 3

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SLIDE 4

NEUTRINO OSCILLATION

13 July 2015 Joao Coelho

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Time

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SLIDE 5

NEUTRINO OSCILLATION

13 July 2015 Joao Coelho

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SLIDE 6

NEUTRINO OSCILLATION

13 July 2015 Joao Coelho

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SLIDE 7

NEUTRINO OSCILLATION

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SLIDE 8

NEUTRINO OSCILLATION

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SLIDE 9

NEUTRINO OSCILLATION

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SLIDE 10

NEUTRINO OSCILLATION

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SLIDE 11

NEUTRINO OSCILLATION

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SLIDE 12

NEUTRINO OSCILLATION

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n n̅

  • Flip CP  Flip T (CPT theorem)
  • Triangle is not symmetric (CP violation)
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SLIDE 13

NEUTRINO OSCILLATION

13 July 2015 Joao Coelho

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 na → na is T invariant, so it must be CP invariant (CPT theorem)  Also, only even orders in D ≡ Dm2L/E

qmm ~ q23 symmetry Dm2

mm ~ Dm2 32 symmetry

CP violation (sind term) Breaks q23 symmetry Different effective Dm2

nm Disappearance ne Appearance

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SLIDE 14

GOING THROUGH THE EARTH

13 July 2015 Joao Coelho

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  • Earth is transparent to neutrinos
  • It has a neutrino “refractive index”
  • Main effect is change in q13
  • Depends on sign of Dm2

32

  • Different signs for n and n̅
  • Apparent CP violation
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SLIDE 15

THE NUMI BEAM

13 July 2015 Joao Coelho 15

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SLIDE 16

RAMPING UP

13 July 2015 Joao Coelho

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NOvA Near Det. NuMI Target Neutrinos to Far Det. Hadron Decay Proton Accel.

  • Capable of 700 kW
  • Currently at ~470 kW
  • Full power by mid 2016
  • 6.4 x 1020 PoT delivered
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SLIDE 17

BASELINE

13 July 2015 Joao Coelho

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NOvA 810 km 0.84˚ off-axis

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SLIDE 18

OFF-AXIS

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14 mrad 7 mrad On-axis

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SLIDE 19

NUE APPEARANCE

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SLIDE 20

NUE APPEARANCE

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SLIDE 21

NUE APPEARANCE

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SLIDE 22

NUE APPEARANCE

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Matter Effect Dm2

32 > 0

Dm2

32 < 0

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SLIDE 23

NUE APPEARANCE

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Matter Effect CPV Term

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SLIDE 24

NUE APPEARANCE

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Matter Effect CPV Term dCP

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SLIDE 25

NUE APPEARANCE

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Normal Ordering Inverted Ordering q23 > p/4 q23 < p/4

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SLIDE 26

NUE APPEARANCE

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Normal Ordering Inverted Ordering q23 > p/4 q23 < p/4

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SLIDE 27

NOVA

13 July 2015 Joao Coelho 27

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SLIDE 28

NOVA

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Highly active (60%) Tracking calorimeters Fine granularity (4x6 cm) FD → 344,064 channels ND → 20,192 channels

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SLIDE 29

NOVA

13 July 2015 Joao Coelho

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Highly active (60%) Tracking calorimeters Fine granularity (4x6 cm) FD → 344,064 channels ND → 20,192 channels

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SLIDE 30

NOVA

13 July 2015 Joao Coelho

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SLIDE 31

DETECTORS COMPLETE

13 July 2015 Joao Coelho

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SLIDE 32

DETECTORS COMPLETE

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SLIDE 33

DETECTORS COMPLETE

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SLIDE 34

FAR DETECTOR

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SLIDE 35

550 ms trigger window

FD DATA

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SLIDE 36

10 ms beam window

FD DATA

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SLIDE 37

Zoom in on neutrino interaction

FD DATA

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SLIDE 38

NEAR DETECTOR

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NOvA Near Det. 100 m Beam axis

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SLIDE 39

550 ms trigger window

ND DATA

13 July 2015 Joao Coelho

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SLIDE 40

10 ms beam window

ND DATA

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SLIDE 41

Separate into different interactions (slices)

ND DATA

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SLIDE 42

Isolate contained neutrino interaction

ND DATA

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SLIDE 43

Reconstruct vertex and clusters

ND DATA

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SLIDE 44

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NUMU DISAPPEARANCE

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SLIDE 45

NOVA TOPOLOGIES

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SLIDE 46

NC REJECTION

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COSMIC REJECTION

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Selection nm-CC Signal NC Background Cosmics No Cuts 127 380 19.1 M Containment 109 195 120 k NC Rejection 86 5 44 k Cosmics Rejection 75 4 1

  • Track information

used in BDT

  • Achieve a 19M : 1

rejection ratio

  • Numbers based
  • n 1 nominal year

(6 x 1020 PoT x 14 kt)

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SLIDE 48

NUMU DISAPPEARANCE

13 July 2015 Joao Coelho

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  • Clear oscillation signal
  • Excellent resolution of
  • scillation dip
  • ~1% precision on sin2(2q23)
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SLIDE 49

NUMU DISAPPEARANCE

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  • Will test maximal mixing
  • MINOS-T2K discrepancy
  • First results may give

some hints, but will not be conclusive

90% CL 68% CL

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SLIDE 50

13 July 2015 Joao Coelho 50

NUE APPEARANCE

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SLIDE 51

NOVA TOPOLOGIES

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FINDING NUE’S

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  • Compare hit distribution with a

library of MC simulated events

  • Perform multivariate analysis on

properties of best matches to event

  • Compare LogL of energy deposition

with different particle assumptions

  • Perform multivariate analysis on LogL

differences and shower properties

Library Event Matching Likelihood ne Identifier

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SLIDE 53

COSMIC REJECTION

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  • Cosmic rejection essential
  • Similar performance from both

selection methods

  • Achieve a 50M : 1 rejection ratio

Cosmic Background* LID LEM No Cuts 15 M 15 M Containment 0.6 M 1 M Cosmics Rejection 5 k 6 k Preselection 40 60 PID 0.3 0.3 *Based on 96 live-seconds

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SLIDE 54

HOW MANY?

13 July 2015 Joao Coelho

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  • Far detector predictions are corrected using near detector data
  • Predictions are scaled to a full detector exposure equivalent to
  • approx. 1/2 nominal year, representative of expected first results
  • The oscillation model assumed no matter effect and:
  • dCP = 0
  • sin22q13 = 0.095
  • Osc. ne-CC

Total Bkg. nm-CC NC Beam ne-CC Cosmics LEM 4.7 1.5 0.07 0.5 0.5 0.4 LID 4.4 1.3 0.07 0.4 0.4 0.4

PRELIMINARY

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SLIDE 55

13 July 2015 Joao Coelho 55

WHAT TO EXPECT

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SLIDE 56

THE TENSION

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sin2(2q13) ~ 0.1 T2K 295 km 735 km

Inverted Ordering Normal Ordering

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SLIDE 57

WHAT WE KNOW

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Normal Ordering Inverted Ordering

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SLIDE 58

WHAT WE’LL FIND OUT

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Disclaim laimer er: : No No official al NO NOvA data or simulation tion used d in these plots

  • ts.
  • What if NOvA sees

6 events?

  • Average expectation
  • Lower than T2K
  • No clear answer on

mass ordering, but still prefer maximal CP violation due to T2K

Normal Ordering Inverted Ordering

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SLIDE 59

WHAT WE’LL FIND OUT

13 July 2015 Joao Coelho

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Disclaim laimer er: : No No official al NO NOvA data or simulation tion used d in these plots

  • ts.
  • What if NOvA sees

9 events?

  • Higher than expected
  • Similar to T2K
  • Some tension with

standard oscillation

  • Improved sensitivity to

mass ordering, q23 octant and CP violation

Normal Ordering Inverted Ordering

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SLIDE 60

WHAT WE’LL FIND OUT

13 July 2015 Joao Coelho

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Disclaim laimer er: : No No official al NO NOvA data or simulation tion used d in these plots

  • ts.
  • What if NOvA sees

3 events?

  • Lower than expected
  • Opposite of T2K
  • Relatively strong

tension with standard

  • scillation picture

Normal Ordering Inverted Ordering

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SLIDE 61

THE END GOAL

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Normal Ordering Inverted Ordering

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SLIDE 62

NOVA ♥ T2K

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Normal Ordering Inverted Ordering

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SLIDE 63

SUMMARY

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  • NOvA will be releasing exciting first

results in the upcoming weeks

  • About half a nominal year of full

detector equivalent data already collected (~3 x 1020 PoT)

  • Predict anywhere from 3 to 9

candidate ne events depending on exact oscillation parameters

  • Will NOvA prefer MINOS or T2K?
  • Place your bets!
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SLIDE 64

13 July 2015 Joao Coelho 64

BACKUP SLIDES

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SLIDE 65

NON-STANDARD INTERACTIONS

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  • What if there are new

interactions?

  • Change in refractive

index

  • Extra CP violation
  • Larger parameter

space

  • NOvA will have world

leading sensitive to these NSI effects

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SLIDE 66

NON-STANDARD INTERACTIONS

13 July 2015 Joao Coelho

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