Brief notes on neutrino oscillations and latest T2K results Pablo - - PowerPoint PPT Presentation

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Brief notes on neutrino oscillations and latest T2K results Pablo - - PowerPoint PPT Presentation

May 20, 2023 187 likes •298 views

Brief notes on neutrino oscillations and latest T2K results Pablo Fernndez de Salas Oskar Klein Centre for Cosmoparticle Physics, Stockholm University BSM meeting - 28th April 2020 Two distinct oscillation frequencies 3 neutrino oscillation

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SLIDE 1

Brief notes on neutrino

  • scillations and latest T2K results

Pablo Fernández de Salas

Oskar Klein Centre for Cosmoparticle Physics, Stockholm University

BSM meeting - 28th April 2020

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SLIDE 2

28th April 2019

  • P. F. de Salas

2

3 neutrino oscillation probability (vacuum)

Two distinct oscillation frequencies

2 neutrino approximation

Oscillation parameters from best-fit values of P.F. de Salas et al, PLB 782 (2018) 633

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SLIDE 3

28th April 2019

  • P. F. de Salas

3

Different experiments are sensitive to different parameters

solar angle atmospheric angle reactor angle CP phase

Experiments and neutrino parameters

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SLIDE 4

28th April 2019

  • P. F. de Salas

4

LBL experiments such as T2K

Experiments and neutrino parameters

Disappearance probability Appearance probability Jarlskog invariant

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SLIDE 5

28th April 2019

  • P. F. de Salas

5

T2K (Tokai to Kamioka)

Image from: https://www.ppd.stfc.ac.uk/Pages/T2K.aspx Image from: Khabibullin, Marat. (2018). Recent results from the T2K experiment. EPJ Web of Conferences. 191. 03001

<E> = 0.6 GeV

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SLIDE 6

28th April 2019

  • P. F. de Salas

6

Neutrino fmavour in Super-Kamiokande

PID discriminator µ e/

  • 2000
  • 1000

1000 2000 Number of events

20 40 60 80

T2K Data CC

e

ν and

e

ν CC

µ

ν and

µ

ν Neutral current

  • like

e

ν

  • like

µ

ν

Super-Kamiokande interior

  • K. Abe et al, Nature (2020) 580, 339

[arXiv:1910.03887}

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SLIDE 7

28th April 2019

  • P. F. de Salas

7

Efgect of CP phase in event distribution

  • K. Abe et al, Nature (2020) 580, 339

[arXiv:1910.03887}

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SLIDE 8

28th April 2019

  • P. F. de Salas

8

T2K (Tokai to Kamioka)

  • K. Abe et al, Nature (2020) 580, 339

[arXiv:1910.03887}

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SLIDE 9

28th April 2019

  • P. F. de Salas

9

Solar sector

Cl, Ga SK, SNO Borexino KamLAND

Atmospheric neutrino detectors

SK (official χ² maps) IceCube-DeepCore ANTARES

SBL reactor LBL accelerator

Daya Bay RENO Double Chooz MINOS K2K, T2K NOνBA

P.F. de Salas et al, PLB 782 (2018) 633

Experiments and neutrino parameters

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SLIDE 10

28th April 2019

  • P. F. de Salas

10

P.F. de Salas et al, PLB 782 (2018) 633

Summary global fjt

Relative 1 sigma uncertainties ~2.6% ~6.3% ~1.5% ~5.5% ~3.5% ~13.5%

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SLIDE 11

28th April 2019

  • P. F. de Salas

11

The CP phase

  • Leading experiment T2K
  • Global sensitivity improved

thanks to reactor angle determination

  • Values ~π/2!π/2

disfavoured at > 4 σ

P.F. de Salas et al, PLB 782 (2018) 633