Low Scale Testable Leptogenesis Jacobo Lpez-Pavn Neutrino Physics - - PowerPoint PPT Presentation

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Low Scale Testable Leptogenesis Jacobo Lpez-Pavn Neutrino Physics - - PowerPoint PPT Presentation

Sep 12, 2023 276 likes •1.01k views

Low Scale Testable Leptogenesis Jacobo Lpez-Pavn Neutrino Physics at the High Energy Frontier ACFI, 18-20 July 2017 Outline Minimal Seesaw Model. New Physics Scale. Testable Leptogenesis. Hernandez, Kekic, JLP, Racker, Rius

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Jacobo López-Pavón

Neutrino Physics at the High Energy Frontier

ACFI, 18-20 July 2017

Low Scale

Testable Leptogenesis

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Outline

  • Minimal Seesaw Model. New Physics Scale.
  • Testable Leptogenesis.
  • CP violation in the minimal model.
  • Modifications of the minimal model predictions from

Higher energy New Physics effects.

  • Conclusions

Hernandez, Kekic, JLP, Racker, Rius 1508.03676; Hernandez, Kekic, JLP, Racker, Salvado 1606.06719 Caputo, Hernandez, Kekic, JLP, Salvado 1611.05000 Caputo, Hernandez, JLP, Salvado 1704.08721

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Heavy fermion singlet: . Type I seesaw. Minkowski 77; Gell-Mann, Ramond, Slansky 79; Yanagida 79; Mohapatra, Senjanovic 80.

Minimal Model: Seesaw Model

We will focus on the simplest extension of SM able to account for neutrino masses:

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Heavy fermion singlet: . Type I seesaw. Minkowski 77; Gell-Mann, Ramond, Slansky 79; Yanagida 79; Mohapatra, Senjanovic 80.

New Physics Scale

( )

Minimal Model: Seesaw Model

We will focus on the simplest extension of SM able to account for neutrino masses:

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GeV MeV keV eV meV TeV GUTs

The New Physics Scale

Hierarchy Problem not testable

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GeV MeV keV eV meV TeV GUTs

The New Physics Scale

Hierarchy Problem Cosmology

  • Minimal Type-I seesaw with NR=2

CMB+BBN data MR >100 MeV

  • Type-I seesaw with NR=3 &

M2, M3>100 MeV M1 unbounded

  • P. Hernandez, M. Kekic, JLP 1311.2614;1406.2961

(or Type-I seesaw with NR=3 & )

not testable

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GeV MeV keV eV meV TeV GUTs

The New Physics Scale

Hierarchy Problem Cosmology

  • Resonant Leptogenesis M>100GeV
  • Leptogenesis via Oscillations M=0.1-100GeV

Pilaftsis Akhmedov, Rubakov, Smirnov (ARS); Asaka, Shaposnikov (AS)

not testable

see talk by Bhupal Dev

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GeV Scale Leptogenesis

Asaka, Shaposhnikov;Shaposhnikov; Asaka, Eijima, Ishida; Canetti, Drewes, Frossard, Shaposhnikov;Drewes, Garbrecht; Shuve, Yavin; Abada, Arcadi, Domcke, Lucente... Hernandez, Kekic, JLP, Racker, Rius 1508.03676; Hernandez, Kekic, JLP, Racker, Salvado 1606.06719

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Kinematic Equations

  • Fermi-Dirac or Bose-Einstein statistics is kept throughout
  • Collision terms include 2 ↔ 2 scatterings at tree level with top quarks

and gauge bosons, as well as 1 ↔ 2 scatterings, including the resummation of scatterings mediated by soft gauge bosons

  • Leptonic chemical potentials are kept in all collision terms to linear
  • rder
  • Include spectator processes

We have solved the equations for the density matrix in the Raffelt-Sigl formalism

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Kinematic Equations

We have solved the equations for the density matrix in the Raffelt-Sigl formalism using the code SQuIDS

Arguelles Delgado, Salvado, Weaver 2015 https://github.com/jsalvado/SQuIDS

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Full parameter space exploration NR=2

Bayesian posterior probabilities (using nested sampling Montecarlo MultiNest)

Parameters of the model

Fixed by neutrino

  • scillation experiments

Free parameters

Casas-Ibarra

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Leptogenesis in Minimal Model NR=2

Hernandez, Kekic, JLP, Racker, Salvado 2016 arXiv:1606.06719

IH

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Leptogenesis in Minimal Model NR=2

Hernandez, Kekic, JLP, Racker, Salvado 2016 arXiv:1606.06719

PRESENT BOUND FUTURE SENSITIVITY

Inverted light neutrino ordering (IH) Non degenerated solutions

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Leptogenesis in Minimal Model NR=2

Hernandez, Kekic, JLP, Racker, Salvadò 2016 arXiv:1606.06719

PRESENT BOUND FUTURE SENSITIVITY

Inverted light neutrino ordering (IH) Non very degenerate solutions

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Leptogenesis in Minimal Model NR=2

Hernandez, Kekic, JLP, Racker, Salvadò 2016 arXiv:1606.06719

Inverted light neutrino ordering

SHiP (see talk by Nicola Serra) DUNE

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What if the sterile are within reach of SHiP? Can we estimate YB from the experiments?

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Predicting YB in minimal model NR=2

  • Baryon asymmetry for IH and in the weak wash out regime:
  • SHiP sensitive to sterile neutrinos

( large )

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Predicting YB in minimal model NR=2

  • Baryon asymmetry for IH and in the weak wash out regime:
  • SHiP sensitive to sterile neutrinos

( large )

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Predicting YB in minimal model NR=2

  • Baryon asymmetry for IH and in the weak wash out regime:
  • SHiP sensitive to sterile neutrinos

( large )

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Predicting YB in minimal model NR=2

  • SHiP sensitive to sterile neutrinos

( large )

  • Baryon asymmetry depends on all the unknown

parameters (also on at )

  • Baryon asymmetry for IH and in the weak wash out regime:
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Predicting YB in minimal model NR=2

  • SHiP can measure (if sterile states not too degenerate)
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Predicting YB in minimal model NR=2

  • SHiP can measure (if sterile states not too degenerate):
  • SHiP sensitive to

PMNS CP-phases!

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Predicting YB in minimal model NR=2

  • SHiP can measure (if sterile states not too degenerate):
  • SHiP sensitive to

PMNS CP-phases!

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Predicting YB in minimal model NR=2

  • SHiP sensitive to
  • Great but…

...how about which is essential to predict ?

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Neutrinoless double beta decay

mass of propagating neutrino mixing NMEs see talks by Frank Deppisch Michael Ramsey-Musolf Michael Graesser Julia Harz

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Predicting YB in minimal model NR=2

  • Neutrinoless double beta decay effective mass in the IH case
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Predicting YB in minimal model NR=2

  • Neutrinoless double beta decay effective mass in the IH case

LIGHT NEUTRINO contribution

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Predicting YB in minimal model NR=2

  • Neutrinoless double beta decay effective mass in the IH case

HEAVY NEUTRINO contribution LIGHT NEUTRINO contribution

  • Heavy neutrino contribution can be sizable for

Mitra, Senjanovic, Vissani 2011 JLP, Pascoli, Wong 2012

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Predicting YB in minimal model NR=2

  • Neutrinoless double beta decay effective mass in the IH case

HEAVY NEUTRINO contribution LIGHT NEUTRINO contribution

  • Heavy neutrino contribution can be sizable for

Mitra, Senjanovic, Vissani 2011 JLP, Pascoli, Wong 2012

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Hernandez, Kekic, JLP, Racker, Salvadò 2016 arXiv:1606.06719

Predicting YB in minimal model NR=2

SHiP+ SHiP

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Hernandez, Kekic, JLP, Racker, Salvadò 2016 arXiv:1606.06719

Predicting YB in minimal model NR=2

SHiP SHiP+

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Hernandez, Kekic, JLP, Racker, Salvadò 2016 arXiv:1606.06719

Predicting YB in minimal model NR=2

SHiP SHiP+

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Are these less fjne tuned solutions protected by any symmetry?

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  • Quasi-Dirac heavy neutrinos:
  • Light nu masses suppressed with LNV parameters

Approximated LNC

Mohapatra 1986; Mohapatra, Valle 1986; Bernabeu, Santamaria, Vidal, Mendez, Valle 1987; Malinsky, Romao, Valle 2005...

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Approximated LNC

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Approximated LNC

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CP-violation in Minimal Model Measurment of PMNS phases from FCC and ShiP?

Caputo, Hernandez, Kekic, JLP, Salvado arXiv:1611.05000

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CP-violation in minimal model

  • SHiP and FCC can measure:
  • Sensitivity to

PMNS CP-phases!

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CP-violation in minimal model

SHiP FCC-ee

see talks by Oliver Fischer Marcin Chrzaszcz see talk by Nicola Serra

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5 discovery CP-violation

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Tau detection

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Previous predictions rely to a large extent on the minimality

Caputo, Hernandez, JLP, Salvado arXiv:1704.08721

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Minimal Model

NOT ALLOWED NOT ALLOWED

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To what extent can they be modifjed in the presence

  • f additional New Physics?

Caputo, Hernandez, JLP, Salvado arXiv:1704.08721

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Model Independent Approach: EFT

  • The leading NP effects are encoded in effective d=5 operators that can

be constructed in a gauge invariant way with the SM fields and the Nj

Graesser 2007; del Aguila, Bar-Shalom, Soni, Wudka 2009; Aparici, Kim, Santamaria, Wudka 2009.

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  • Generates a third light neutrino mass and a new Majorana CP-phase
  • Modification of the heavy neutrino mixing flavour structure controlled

by the magnitude of the lightest neutrino mass generated.

  • The leading NP effects are encoded in effective d=5 operators that can

be constructed in a gauge invariant way with the SM fields and the Nj

Model Independent Approach: EFT

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Contours of constant ratio

Minimal Model Minimal Model + NP NH IH

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  • The higgs can decay to a pair of long-lived heavy neutrinos!

(powerful signal of two displaced vertices)

  • The leading NP effects are encoded in effective d=5 operators that can

be constructed in a gauge invariant way with the SM fields and the Nj

Accomando, Delle Rose, Moretti, Olaiya, Shepherd-Themistocleous 2017 Caputo, Hernandez, JLP, Salvado 2017

Model Independent Approach: EFT

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Seesaw Portal

i) Search of displaced tracks in the inner tracker where at least

  • ne displace lepton, e or μ, is reconstructed from each vertex.

ii) Search for displaced tracks in the muon chambers and outside the inner tracker, where at least one μ is reconstructed from each vertex.

Accomando, Delle Rose, Moretti, Olaiya, Shepherd-Themistocleous 2017 CMS Collaboration 1411.6977, CMS-PAS-EXO-14-012

similar to (talk by Miha Nemevšek)

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Seesaw Portal

Inner Tracker (NH) Muon Chamber (NH) IH Mathusla (14 TeV, 3000 fb-1)

Chou, Curtin, Lubatti 2017

LHC (13 TeV, 300 fb-1) (see Lubatti’s talk)

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Conclusions: Minimal Model

  • HIGH PREDICTIVITY!!
  • Successful baryogenesis is possible with a mild heavy neutrino

degeneracy in the minimal model.

  • These less fine-tuned solutions prefer smaller masses M ≤ 1GeV

(target region of SHiP) and significant non-standard contributions to neutrinoless double beta decay.

  • If O(GeV) heavy neutrinos would be discovered in SHiP and the

neutrino ordering is inverted, predicting the baryon asymmetry looks in principle viable, in contrast with previous beliefs.

  • 5σ measurement of leptonic CP violation from SHiP and FCC

would be possible in a very significant fraction of parameter space! (regardless the baryon asymmetry generation).

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Conclusions: Minimal Model + NP

  • Previous predictions relay to a large extent on its minimality..

We studied the impact of NP encoded on d=5 effective operators

  • If coefficients are of the same order, strongest bounds come from

the bounds on the lightest neutrino mass: In order to keep the minimal model predictions on flavour mixing the bound should be much stronger (at least one order of magnitude)

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Conclusions: Minimal Model + NP

  • Previous predictions relay to a large extent on its minimality..

We studied the impact of NP encoded on d=5 effective operators

  • In the presence, instead, of large hierarchies:

which could be protected by global symmetries

LHC:

Aparici, Kim, Santamaria, Wudka 2009. Caputo, Hernandez, JLP, Salvado 2017

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Thanks!

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Seesaw Portal

LHC (13 TeV, 300 fb-1) IH NH

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Production Cross Section

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Production Branching Ratio

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1-loop contribution of to nu masses

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5 discovery CP-violation

SHiP: M= 1 GeV FCC: M= 30 GeV

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Kinematical Cuts

(Independent of U)

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Cuts associated to displaced tracks

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Cuts associated to displaced tracks

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  • Electroweak moment Nj couplings.

Aparici, Kim, Santamaria, Wudka 2009.

  • Generated only at the 1-loop level (suppression with respect to other
  • perators expected)
  • The leading NP effects are encoded in effective d=5 operators that can

be constructed in a gauge invariant way with the SM fields and the Nj

Model Independent Approach: EFT

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SHIP sensitive to PMNS CP phases

SHIP measurement

analytical expectation

Recall, neutrino oscillation experiments sensitive to

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Hernandez, Kekic, JLP, Racker, Salvadò 2016 arXiv:1606.06719

Predicting YB in minimal model NR=2

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Leptogenesis in Minimal Model

Hernandez, Kekic, JLP, Racker, Salvadò 2016 ArXiv:1606.06719

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CP invariants

  • The lepton assymetry should be proportional to a combination of the

following 4 independent CP-invariants CP phases from V & W (UPMNS & R) CP phases from W (only R)

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CP invariants

  • The lepton assymetry should be proportional to a combination of the

following 4 independent CP-invariants

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CP invariants

  • The lepton assymetry should be proportional to a combination of the

following 4 independent CP-invariants

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CP invariants

  • The lepton assymetry should be proportional to a combination of the

following 4 independent CP-invariants