Falsifying highscale Baryogenesis Julia Harz ILP - LPTHE - UPMC - - - PowerPoint PPT Presentation

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Falsifying highscale Baryogenesis Julia Harz ILP - LPTHE - UPMC - - - PowerPoint PPT Presentation

Mar 11, 2024 381 likes •781 views

Falsifying highscale Baryogenesis Julia Harz ILP - LPTHE - UPMC - CNRS Paris in collaboration with F. Deppisch, L. Graf, W. Huang, M. Hirsch, H. Ps 19/07/2017 F. Deppisch, JH, M. Hirsch, PRL 112 (2014) 221601 ACFI Workshop F. Deppisch, JH,

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Falsifying highscale Baryogenesis

Julia Harz

19/07/2017 ILP - LPTHE - UPMC - CNRS Paris

ACFI Workshop

  • F. Deppisch, JH, W. Huang, M. Hirsch, H. Päs, Phys. Rev. D92 (2015) 036005
  • F. Deppisch, JH, M. Hirsch, PRL 112 (2014) 221601
  • F. Deppisch, L. Graf, JH, W. Huang, work in progress

in collaboration with

  • F. Deppisch, L. Graf, W. Huang, M. Hirsch, H. Päs
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H N L Q u H N u L Q

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  • generation of lepton asymmetry via heavy neutrino decays
  • competition with lepton number violating (LNV) washout processes
  • conversion to baryon asymmetry via sphaleron processes at

Recap: Leptogenesis

source of CP-asymmetry

N L H L H N N L H N L H N H L

washout processes

N L H L H N L L H H N L H H L

washout processes scattering processes sphaleron processes

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3 Yes, we can! If we cannot test high-scale Baryogenesis models, can we somehow falsify them?

plot stolen from

  • M. Drewes

What generates the Baryon Asymmetry?

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Falsifying Baryogenesis at the LHC

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LNV at the LHC

measureable LNV signal at LHC and corresponding resonant mass can be related to baryon asymmetry washout signature: (w/o missing energy!)

cross section measured at LHC cross-section in early universe determines washout strength

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LNV at the LHC

  • assuming pre-existing lepton asymmetry generated at high scale
  • bservation of LNV process at the LHC implies very strong washout,

excludes Leptogenesis models that generate asymmetry above MX

CMS

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LNV at the LHC

  • bservation of LNV process at the LHC excludes high-scale baryogensis models and

sets lower limit on the baryon asymmetry of a low-scale leptogenesis model

  • NOW: assumption CP asymmetry is created at scale

scale of CP-asymmetry generation scale of LNV observation

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LNV at the LHC

  • bservation of LNV process at the LHC excludes high-scale baryogensis models and

sets lower limit on the baryon asymmetry of a low-scale leptogenesis model

  • NOW: assumption CP asymmetry is created at scale

not possible to generate large enough baryon asymmetry at all lower limit on CP-asymmetry

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Falsifying Baryogensis at 0vββ experiments

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Neutrinoless Double Beta Decay (0vββ)

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The general Lagrangian which describes different non-SM contributions to 0vββ can be written in terms of effective couplings , e.g. for the long range contribution:

long range contribution

0vββ half life sets constraints on effective couplings

  • F. Deppisch, M. Hirsch, H. Päs, J. Phys. G 39 (2012) 124007, arXiv:1208.0727 [hep-ph], updated
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  • four examples from the complete list of all possible LNV effective operators

If 0vββ is observed, the scale of the underlying operator can be determined

  • K. S. Babu, C. N. Leung, Nucl. Phys. B 619 (2001), arxiv:0106054 [hep-ph]
  • A. de Gouvea, J. Jenkins, PRD 77 (2008), arXiv:0708.1344 [hep-ph]

Possible underlying LNV Operators

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Lepton Asymmetry Washout

  • LNV operator would cause washout of pre-existing net lepton asymmetry in the

early Universe

  • If 0vββ is observed, washout efficient in the temperature interval
  • washout efficient if
  • perator specific factor

lepton density

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Impact on Baryogenesis Models

  • IF 0vββ was observed via a non-standard

mechanism, resulting washout would rule out baryogenesis mechanisms above

  • observation of 0vββ via O9 and O11 will imply
  • bservation of LNV at LHC

(76Ge) (1027y)

scale of operator scale above which washout highly effective scale above which a max. lepton asymmetry of 1 is washed out to or less

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Impact on Baryogenesis Models

  • IF 0vββ was observed via a non-standard

mechanism, resulting washout would rule out baryogenesis mechanisms above

  • observation of 0vββ via O9 and O11 will imply
  • bservation of LNV at LHC
  • 0vββ decay probes only electron-electron

component of LNV operators

(76Ge) (1027y)

scale of operator scale above which washout highly effective scale above which a max. lepton asymmetry of 1 is washed out to or less

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Considering Lepton Flavour Violation (LFV)

IF LFV processes are observed as well, loophole of asymmetry being stored in another flavour sector is ruled out

  • Most stringent limits on LFV set by 6-

dim operators

  • determine interval in which LFV

process equilibrate pre-existing flavour asymmetry

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  • SuperNEMO can discriminate O7 from others, due to e-

R and e- L in final state

  • bservation of 0vββ via O9 and O11 will imply observation of LNV at LHC
  • distinguishing between different mechanisms

via measurements in different isotopes

SuperNEMO collaboration, arXiv:1005.1241 [hep-ex] Deppisch, Paes, PRL 98 (2007) Gehmann, Elliott, J. Phys G 34 (2007)

Distinguishing between different Operators

  • potential discrepancy between neutrino mass (cosmology) and 0vbb half live measurement

could be an indication for 0vbb triggered by non-standard mechanism

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Falsifying Baryogenesis refined

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Comparison with UV complete Model

effective operator approach is a conservative estimation of washout rate

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Lepton Number violating effective operators

  • K. S. Babu, C. N. Leung, Nucl. Phys. B 619 (2001), arxiv:0106054 [hep-ph]
  • A. de Gouvea, J. Jenkins, PRD 77 (2008), arXiv:0708.1344 [hep-ph]

So far, we studied for each dimension one

  • perator to show the impact exemplarily

Exhaustive study:

  • Study them all
  • contribution to lower

dimensional operator (loop effects)

  • compile complete list
  • f washout strength

for each operator

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Lepton Number violating effective operators

18 different 9-dim operators 105 different 11-dim operators at tree level

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Lepton Number violating effective operators

18 different 9-dim operators 105 different 11-dim operators including loop effects

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Why is it of interest?

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Many different effects do interplay! 7 dim – tree level 9 dim with 3 Higgs doublets short range contribution suppressed, long range dominant comparable if

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Effective washout range

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preliminary 7 7 9 9 1st generation 3rd generation

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Why is it of interest?

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Dependence on experimental sensitivity

  • F. Deppisch, M. Hirsch, H. Päs, J. Phys. G 39 (2012) 124007, arXiv:1208.0727 [hep-ph], updated
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Effective washout range

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preliminary 7 7 9 9 1st generation 3rd generation

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Why is it of interest?

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Crucial dependence on SU(2) structure and Yukawa couplings

  • nly at one loop

at tree level same (flavour structure!)

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Effective washout range

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preliminary 7 7 9 9 1st generation 3rd generation

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Effective washout range

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preliminary 7 7 9 9 1st generation 3rd generation

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Why is it interesting?

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Same for 11dim… 11D to 9D 11D to 7D

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Effective washout range

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preliminary 7 7 9 9 1st generation 3rd generation

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Automatization

(A) Constraining the operator scale

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1) SU(2) decomposition 2) Reduce every operator to every operator equal and lower in dimension 3) find the dominant contribution for every combination

(start and ending operator)

1) SU(2) decomposition 2) Reduce every operator to every operator equal and lower in dimension 3) find the dominant contribution for every combination 4) Fierz transform (if necessary) to get the right effective coupling 5) identify the scale of the operator

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Automatization

1) Consider the reaction density of all different n to m processes (A) Calculation of the Washout

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1) Consider the reaction density of all different n to m processes 2) relate chemical potentials 3) Consider different channels and symmetry factors

Automatization

1) Consider the reaction density of all different n to m processes 2) relate chemical potentials (A) Calculation of the Washout

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(c) flavour structure (b) same particles in initial / final state (a) contractions Finally result:

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There are 129 of them…

All higher dimensional operators reduced to long range contribution 1st generation Yukawa couplings preliminary

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There are 129 of them…

All higher dimensional operators reduced to long range contribution 3rd generation Yukawa couplings preliminary

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There are 129 of them…

All higher dimensional operators reduced to long range contribution 3rd generation Yukawa couplings preliminary

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  • LNV processes are of high interest with respect to the nature of baryogenesis
  • possibility to falsify baryogenesis models!
  • tight connection between different frontiers
  • LNV and LFV interesting to look and search for

Conclusions

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