Neutrino decay sensitivity with ORCA Pablo Fern andez de Salas - - PowerPoint PPT Presentation

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Neutrino decay sensitivity with ORCA Pablo Fern andez de Salas Oskar Klein Centre for Cosmoparticle Physics, Stockholm University 29-11-2018 Based on: PFdS, S. Pastor, C.A. Ternes, T. Thakore, M. T ortola, arXiv:1810.10916 H2020

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Neutrino decay sensitivity with ORCA

Pablo Fern´ andez de Salas

Oskar Klein Centre for Cosmoparticle Physics, Stockholm University 29-11-2018

Based on: PFdS, S. Pastor, C.A. Ternes, T. Thakore, M. T´

  • rtola, arXiv:1810.10916

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 1

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Neutrino decay: motivation

Despite current experimental precision, there are some unknown neutrino properties:

neutrino mass ordering true θ23 octant absolute neutrino mass · · ·

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 2

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Neutrino decay: motivation

Despite current experimental precision, there are some unknown neutrino properties:

neutrino mass ordering true θ23 octant absolute neutrino mass · · ·

In the past, ν decay was one of the proposed solutions to the atmospheric and solar problems

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 2

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Neutrino decay: motivation

Despite current experimental precision, there are some unknown neutrino properties:

neutrino mass ordering true θ23 octant absolute neutrino mass · · ·

In the past, ν decay was one of the proposed solutions to the atmospheric and solar problems Some theories predict neutrino decay (e.g. Majoron models): νi → νj + J

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 2

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Neutrino decay: motivation

Despite current experimental precision, there are some unknown neutrino properties:

neutrino mass ordering true θ23 octant absolute neutrino mass · · ·

In the past, ν decay was one of the proposed solutions to the atmospheric and solar problems Some theories predict neutrino decay (e.g. Majoron models): νi → νj + J Testing ν decay through oscillations vs SN and cosmology

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 2

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Neutrino decays

Standard Model neutrino decay extremely suppressed: νi → νj + γ νi → νj + νk + νl τ 1037 yr

J.M. Berryman et al., PRD 92 (2015) 073003

  • C. Broggini et al, Adv.High Energy Phys. 2012 (2012) 459526

In BSM scenarios, the decay product νj involves: An active neutrino: visible decay Otherwise: invisible decay

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 3

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Neutrino decays

Standard Model neutrino decay extremely suppressed: νi → νj + γ νi → νj + νk + νl τ 1037 yr

J.M. Berryman et al., PRD 92 (2015) 073003

  • C. Broggini et al, Adv.High Energy Phys. 2012 (2012) 459526

In BSM scenarios, the decay product νj involves: An active neutrino: visible decay Otherwise: invisible decay

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 3

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Our case: Invisible neutrino decay

ν3 → ν4 + J Normal Ordering: m1 < m2 < m3 and m4 < m3 No mixing among the sterile and active neutrinos να νs

  • =

U 1 νk ν4

  • H2020 Oscillation physics Workshop

P.F. de Salas - neutrino decay sensitivity with ORCA 4

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Flavour oscillations and invisible decay

Full neutrino Hamiltonian H = 1 2E (H0 + Hm + HD) Vacuum and matter terms H0 = U   ∆m2

21

∆m2

31

  U†, Hm = 2E √ 2GF   Ne   Neutrino decay term HD = U   −iα3   U† ∆m2

31 → ∆m2 31 − iα3

α3 = m3/τ3

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 5

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Flavour oscillations and invisible decay

5 10 15 20

E [GeV]

1.0 0.8 0.6 0.4 0.2 0.0

cos

z

P

decay standard

3 = 10 5 eV2

( )

0.25 0.20 0.15 0.10 0.05 0.00

2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0

E [GeV]

1.0 0.8 0.6 0.4 0.2 0.0

cos

z

P( )

0.0 0.2 0.4 0.6 0.8 1.0

5 10 15 20

E [GeV]

1.0 0.8 0.6 0.4 0.2 0.0

cos

z

P

decay standard

3 = 10 5 eV2

(

e)

0.045 0.030 0.015 0.000

2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0

E [GeV]

1.0 0.8 0.6 0.4 0.2 0.0

cos

z

P( )

0.0 0.2 0.4 0.6 0.8 1.0

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 6

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Flavour oscillations and invisible decay

5 10 15 20

E [GeV]

1.0 0.8 0.6 0.4 0.2 0.0

cos

z

P

decay standard

3 = 10 5 eV2

( )

0.25 0.20 0.15 0.10 0.05 0.00

2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0

E [GeV]

1.0 0.8 0.6 0.4 0.2 0.0

cos

z

P( )

0.0 0.2 0.4 0.6 0.8 1.0

5 10 15 20

E [GeV]

1.0 0.8 0.6 0.4 0.2 0.0

cos

z

P

decay standard

3 = 10 5 eV2

(

e)

0.045 0.030 0.015 0.000

3 4 5 6 7 8 9 10 15 20

E [GeV]

0.2 0.4 0.6 0.8 1

Probability Pµe Pµµ

α3 = 0 α3 = 10

  • 5 eV

2

α3 = 10

  • 4 eV

2

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 6

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Oscillation Research with Cosmics in the Abyss (ORCA)

115 lines, 20 m spaced 18 DOMs/line, 9 m spaced Angular resolution of just a few degrees for showers

  • S. Adri´

an-Mart´ ınez, et al., Letter of intent for KM3NeT 2.0, J. Phys. G 43 (2016) 084001 H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 7

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Event topology

Tracks: νµ CC Showers: νe,τ CC and να NC

  • S. Adri´

an-Mart´ ınez, et al., Letter of intent for KM3NeT 2.0, J. Phys. G 43 (2016) 084001 H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 8

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Simulation

Frequentist approach for the two topologies T : showers and tracks

❝

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 9

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Simulation

Frequentist approach for the two topologies T : showers and tracks Simulation Mock data Systematics

χ2 = min

  • ǫ

    

  • i,j

   Nij(sin2 θ23, ∆m2

31, α3;

ǫ) − Ndat

ij

  • Ndat

ij

  

2

+

  • k

ǫk − µk σk 2      Each topology receives contribution from each neutrino flavour α and interaction channel ❝: NT

ij =

  • α
  • c

T cα

pidNcα ij

α = {e, µ, τ}, c = {CC, NC}, pid: particle identification performance

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 9

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Simulation

The simulated number of events depends on detector quantities and theoretical quantities

Ncα

ij

= 2πT θi+1

z,rec

θi

z,rec

dθz,rec E j+1

rec

E j

rec

dErec π dθz,true +∞ dEtrue × Mcα

eff (Etrue)

mp Detector effective mass × Rcα(θz,rec, Erec, θz,true, Etrue) Detector resolution × σcα

  • β={e,µ}

d2φ0

β

d cos θzdEtruePνβ→να

Pνβ→να Pνβ→να Neutrino cross section and flux

Simulation Pνβ→να (cos θz, Eν, α3)

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 10

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Sensitivity of ORCA to α3

Mock data generated with α3 = 0

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 11

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Sensitivity of ORCA to α3

Mock data generated with α3 = 0 Minimize χ2 for fixed (∆m2

31,θ23) and different α3 values

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 11

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Sensitivity of ORCA to α3

Mock data generated with α3 = 0 Minimize χ2 for fixed (∆m2

31,θ23) and different α3 values

Minimize χ2 varying also atmospheric oscillation parameters

χ2

decay(α3) =

min

sin2 θ23,∆m2

31

  • χ2(sin2 θ23, ∆m2

31, α3)

  • Other neutrino oscillation parameters fixed to best fit from:

PFdS, D.V. Forero, C.A. Ternes, M. T´

  • rtola, J.W.F. Valle, PLB 782 (2018) 633

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 11

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Sensitivity of ORCA to α3

5 10 15 20

α3 [10

  • 6 eV

2]

5 10 15 20 25

∆χ

2

5 10 15 20

α3 [10

  • 6 eV

2]

fixed osc. parameters free osc. parameters

3 years 10 years 90% C.L. 90% C.L. time α3 [eV2] τ3/m3 [s/eV] 3 years < 4.6 × 10−6 > 1.4 × 10−10 10 years < 2.6 × 10−6 > 2.5 × 10−10

PFdS, S. Pastor, C.A. Ternes, T. Thakore, M. T´

  • rtola, arXiv:1810.10916

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 12

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Contribution from different topologies

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 13

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Effect on standard oscillation parameters

Filled colors: standard (α3 = 0) Lines: marginalizing α3

★ 0.4 0.5 0.6

sin

2θ23 2.4 2.5 2.6

∆m

2 31 [10

  • 3 eV

2] ★ 0.4 0.5 0.6

sin

2θ23

95,99% C.L.

3 years 10 years

Small effect only in the first octant

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 14

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Effect on mass ordering determination

0.1 1 10 100 1000

α3 [10

  • 6 eV

2]

5 10

√

∆χ

2

NO IO

10 years 3 years

Around the region of interest (α3 ∼ 10−6 eV2) the neutrino mass

  • rdering sensitivity is robust

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 15

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Other determinations of ν-decay parameters

From oscillations (90% CL) τ2/m2 2 · 10−3 s/eV from solar neutrinos (Homestake, SAGE,

GALLEX/GNO, SK-I, SNO, Borexino)

  • R. Picoreti et al., PLB 761 (2016) 70

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 16

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Other determinations of ν-decay parameters

From oscillations (90% CL) τ2/m2 2 · 10−3 s/eV from solar neutrinos (Homestake, SAGE,

GALLEX/GNO, SK-I, SNO, Borexino)

  • R. Picoreti et al., PLB 761 (2016) 70

τ3/m3 3 · 10−10 s/eV from K2K, MINOS, atmospheric SK I-II

M.C. Gonzalez-Garcia et al., PLB 663 (2008) 405

τ3/m3 2.8 · 10−12 s/eV from T2K, MINOS

R.A. Gomes et al., PLB 740 (2015) 345

τ3/m3 2 · 10−12 s/eV from NOνA, T2K

  • S. Choubey et al., JHEP 08 (2018) 141

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 16

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Other determinations of ν-decay parameters

From oscillations (90% CL) τ2/m2 2 · 10−3 s/eV from solar neutrinos (Homestake, SAGE,

GALLEX/GNO, SK-I, SNO, Borexino)

  • R. Picoreti et al., PLB 761 (2016) 70

τ3/m3 3 · 10−10 s/eV from K2K, MINOS, atmospheric SK I-II

M.C. Gonzalez-Garcia et al., PLB 663 (2008) 405

τ3/m3 2.8 · 10−12 s/eV from T2K, MINOS

R.A. Gomes et al., PLB 740 (2015) 345

τ3/m3 2 · 10−12 s/eV from NOνA, T2K

  • S. Choubey et al., JHEP 08 (2018) 141

From SN 1987A: τi/mi 5.5 · 105 s/eV for at least 1 neutrino

J.A. Frieman et al., PLB 200 (1988) 115 H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 16

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Other determinations of ν-decay parameters

From oscillations (90% CL) τ2/m2 2 · 10−3 s/eV from solar neutrinos (Homestake, SAGE,

GALLEX/GNO, SK-I, SNO, Borexino)

  • R. Picoreti et al., PLB 761 (2016) 70

τ3/m3 3 · 10−10 s/eV from K2K, MINOS, atmospheric SK I-II

M.C. Gonzalez-Garcia et al., PLB 663 (2008) 405

τ3/m3 2.8 · 10−12 s/eV from T2K, MINOS

R.A. Gomes et al., PLB 740 (2015) 345

τ3/m3 2 · 10−12 s/eV from NOνA, T2K

  • S. Choubey et al., JHEP 08 (2018) 141

From SN 1987A: τi/mi 5.5 · 105 s/eV for at least 1 neutrino

J.A. Frieman et al., PLB 200 (1988) 115

From cosmology: τ/m 1011 s/eV

(95% CL) (this bound could be relaxed)

  • M. Archidiacono et al., JCAP 07 (2014) 046

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 16

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Other prospects on invisible ν-decay

from ORCA (10 yr) τ3/m3 2.5 · 10−10 s/eV

From oscillations (90% CL) τ3/m3 4.5 · 10−11 s/eV from DUNE (5 yr ν + 5 yr ¯ ν)

  • S. Choubey et al., JHEP 02 (2016) 055

τ3/m3 9.1 · 10−11 s/eV from JUNO (5 yr)

  • T. Abrahao et al., JHEP 11 (2015) 001

τ3/m3 1.5 · 10−10 s/eV from INO-ICAL (10 yr)

  • S. Choubey et al., PRD 97 (2018) 033005

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 17

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Other prospects on invisible ν-decay

from ORCA (10 yr) τ3/m3 2.5 · 10−10 s/eV

From oscillations (90% CL) τ3/m3 4.5 · 10−11 s/eV from DUNE (5 yr ν + 5 yr ¯ ν)

  • S. Choubey et al., JHEP 02 (2016) 055

τ3/m3 9.1 · 10−11 s/eV from JUNO (5 yr)

  • T. Abrahao et al., JHEP 11 (2015) 001

τ3/m3 1.5 · 10−10 s/eV from INO-ICAL (10 yr)

  • S. Choubey et al., PRD 97 (2018) 033005

From supernovae: strong limits if diffuse ν flux is measured

  • S. Ando, PLB 570 (2003) 11

G.L. Fogli et al., PRD 70 (2004) 013001 H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 17

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Other prospects on invisible ν-decay

from ORCA (10 yr) τ3/m3 2.5 · 10−10 s/eV

From oscillations (90% CL) τ3/m3 4.5 · 10−11 s/eV from DUNE (5 yr ν + 5 yr ¯ ν)

  • S. Choubey et al., JHEP 02 (2016) 055

τ3/m3 9.1 · 10−11 s/eV from JUNO (5 yr)

  • T. Abrahao et al., JHEP 11 (2015) 001

τ3/m3 1.5 · 10−10 s/eV from INO-ICAL (10 yr)

  • S. Choubey et al., PRD 97 (2018) 033005

From supernovae: strong limits if diffuse ν flux is measured

  • S. Ando, PLB 570 (2003) 11

G.L. Fogli et al., PRD 70 (2004) 013001

From cosmology: future mν detection → τ/m 1016 s/eV

P.D. Serpico, PRL 98 (2007) 171301 H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 17

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Conclusions

Our forecast for ORCA sensitivity to neutrino decay leads to τ3/m3 2.5 × 10−10 s/eV (90 % CL) One of the most stringent constraints coming from

  • scillation experiments

Synergy among oscillation, astrophysics and cosmology

(A positive measurement of ν decay in oscillation experiments might impact our understanding of the Universe)

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 18

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Conclusions

Our forecast for ORCA sensitivity to neutrino decay leads to τ3/m3 2.5 × 10−10 s/eV (90 % CL) One of the most stringent constraints coming from

  • scillation experiments

Synergy among oscillation, astrophysics and cosmology

(A positive measurement of ν decay in oscillation experiments might impact our understanding of the Universe)

Long live the neutrino!

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 18

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ORCA: shower angular resolution

  • S. Adri´

an-Mart´ ınez, J. Phys. G 43 (2016) 084001, LoI KM3NeT 2.0

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 19

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Systematics

Systematic Expectation value (µk) Standard deviation (σk) N 1 flat γ flat fµe 0.1 fν/¯

ν

0.1 fr,shower 0.2 fr,track 0.2 fE 0.01

X → X(1 + fX ) φ(E, θz) → N ˜ φ(E, θz)

  • E

20 GeV γ Rcα(θz,rec, Eν,rec, θz,true, Eν,true) = rcα

Eν (Eν,rec, Eν,true)rcα θz (θz,rec, θz,true, Eν,true) H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 20

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NMO sensitivity and ν decay

  • T. Abrahao et al, JHEP 11 (2015) 001

∆m2

ee ≡ |c2 12∆m2 31 + s2 12∆m2 32|

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 21

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  • scillation-parameter sensitivity and ν decay
  • T. Abrahao et al, JHEP 11 (2015) 001

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 22

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  • scillation-parameter sensitivity and ν decay
  • S. Choubey et al, PRD 97 (2018) 033005

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 23

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  • scillation-parameter sensitivity and ν decay
  • S. Choubey et al, JHEP 02 (2018) 055

H2020 Oscillation physics Workshop P.F. de Salas - neutrino decay sensitivity with ORCA 24