Lecture V: Energy Frontier Connections M.J. Ramsey-Musolf U Mass - - PowerPoint PPT Presentation

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Lecture V: Energy Frontier Connections M.J. Ramsey-Musolf U Mass Amherst http://www.physics.umass.edu/acfi/ ACFI NLDBD School 10/31-11/3 2017 1 Lecture V Goals Provide some background on present & prospective opportunities for

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Lecture V: Energy Frontier Connections

ACFI NLDBD School 10/31-11/3 2017

M.J. Ramsey-Musolf

U Mass Amherst

http://www.physics.umass.edu/acfi/

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Lecture V Goals

  • Provide some background on present & prospective
  • pportunities for neutrino physics probes at high energy

colliders

  • Alert you to the prospects for LNV searches at the high

energy frontier

  • Illustrate the complementarity with 0νββ-decay
  • Invite questions !
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Lecture V Outline

I. Context II. TeV Scale (and below) LNV III. Sterile neutrinos

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  • I. Context
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BSM Physics: Where Does it Live ?

Mass Scale Coupling MW

BSM ?

SUSY, see-saw, BSM Higgs sector…

BSM ?

Sterile ν’s, axions, dark U(1)…

Is the mass scale associated with mν far above MW ? Near MW ? Well below MW ?

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BSM Physics: Where Does it Live ?

Mass Scale Coupling MW

BSM ?

SUSY, see-saw, BSM Higgs sector…

BSM ?

Sterile ν’s, axions, dark U(1)…

Is the mass scale associated with mν far above MW ? Near MW ? Well below MW ? High energy frontier

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Energy Frontier

CMS ATLAS

LHC International Linear Collider Future Circular e+e- & pp Future Circular e+e- & pp

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Energy Frontier

LHC / HL-LHC

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Future Circular Colliders

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Future Circular Colliders

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Future Circular Colliders

Possible site of CEPC-SppC

  • Q. Qin, PANIC

2017, Beijing

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CEPC / SppC

Parameter Design Goal Par$cles e+, e- Center of mass energy 2 x 120 GeV Peak Luminosity >2 x 1034/cm2/s

  • No. of IP

2

e+ e-

LTB

CEPC (50km-100km)

Boostr(50Km-100km) SppC 50-100Km)

  • Q. Qin, PANIC

2017, Beijing

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SppC

Parameter Unit Value

PreCDR CDR Ul$mate Circumference km 54.4 100 100 C.M. energy TeV 70.6 75 125-150 Dipole field T 20 12 20-24 Injection energy TeV 2.1 2.1 4.2 Number of IPs 2 2 2 Nominal luminosity per IP cm-2s-1 1.2x1035 1.0x1035

  • Beta function at collision

m 0.75 0.75

  • Circulating beam current

A 1.0 0.7

  • Bunch separation

ns 25 25

  • Bunch population

2.0x1011 1.5x1011

  • SR power per beam

MW 2.1 1.1

  • SR heat load per aperture @arc

W/m 45 13

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ILC

Shin Michizono, PANIC 2017, Beijing

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Compact Linear Collier (CLIC)

  • R. Franceschini, LLP Trieste,

October 2917

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ACFI Workshop: July 2017

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  • II. TeV Scale (and below) LNV
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LNV Mass Scale & 0νβ νββ-Decay

A(Z,N) ! ! A(Z+2, N-2) + e- e-

Underlying Physics

  • 3 light neutrinos only: source of neutrino

mass at the very high see-saw scale

  • 3 light neutrinos with TeV scale source of

neutrino mass

  • > 3 light neutrinos
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LNV Mass Scale & 0νβ νββ-Decay

A(Z,N) ! ! A(Z+2, N-2) + e- e-

Underlying Physics

  • 3 light neutrinos only: source of neutrino

mass at the very high see-saw scale

  • 3 light neutrinos with TeV scale source of

neutrino mass

  • > 3 light neutrinos

Two parameters: Effective coupling & effective heavy particle mass

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0νβ νββ-Decay: LNV? Mass Term?

e− e−

A Z,N

( )

A Z − 2,N + 2

( )

TeV LNV Mechanism

Dirac Majorana

Lmass = y ¯ L ˜ HνR + h.c. Lmass = y Λ ¯ LcHHTL + h.c.

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F S S

  • Majorana mass generated at

the TeV scale

  • Low-scale see-saw
  • Radiative mν
  • mMIN << 0.01 eV but 0νββ-signal

accessible with tonne-scale exp’ts due to heavy Majorana particle exchange

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0νβ νββ-Decay: LNV? Mass Term?

e− e−

TeV LNV Mechanism

Dirac Majorana

Lmass = y ¯ L ˜ HνR + h.c. Lmass = y Λ ¯ LcHHTL + h.c.

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  • Majorana mass generated at

the TeV scale

  • Low-scale see-saw
  • Radiative mν
  • mMIN << 0.01 eV but 0νββ-signal

accessible with tonne-scale exp’ts due to heavy Majorana particle exchange W e e ~ ~ ~

A(Z+2, N-2) A(Z, N)

RPV SUSY

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0νβ νββ-Decay: LNV? Mass Term?

e− e−

TeV LNV Mechanism

Dirac Majorana

Lmass = y ¯ L ˜ HνR + h.c. Lmass = y Λ ¯ LcHHTL + h.c.

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NR WR WR

  • Majorana mass generated at

the TeV scale

  • Low-scale see-saw
  • Radiative mν
  • mMIN << 0.01 eV but 0νββ-signal

accessible with tonne-scale exp’ts due to heavy Majorana particle exchange

A(Z+2, N-2) A(Z, N)

LRSM

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0νβ νββ-Decay: TeV Scale LNV

0νββ-Decay Dirac Majorana

Lmass = y ¯ L ˜ HνR + h.c. Lmass = y Λ ¯ LcHHTL + h.c.

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pp Collisions LNV d u d u e e A(Z, N) A(Z+2, N-2) e e LNV d u d u _ _ P P X X

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0νβ νββ-Decay: TeV Scale LNV

0νββ-Decay Dirac Majorana

Lmass = y ¯ L ˜ HνR + h.c. Lmass = y Λ ¯ LcHHTL + h.c.

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pp Collisions LNV d u d u e e A(Z, N) A(Z+2, N-2) e e LNV d u d u _ _ P P X X

LHC: SS Dilepton + Dijet

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0νβ νββ-Decay: TeV Scale LNV

d d u u e− e− F 0 S+ S+

LHC: pp ! jj e-e-

d d u e− e− u

0νββ - decay Dirac Majorana

Lmass = y ¯ L ˜ HνR + h.c. Lmass = y Λ ¯ LcHHTL + h.c.

TeV Scale LNV

Can it be discovered with combination of 0νβ νββ & LHC searches ?

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Simplified models

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Simplified Models: Illustrative Case

S: (1, 2, ½) F: (1, 0, 0) Majorana

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0νβ νββ-Decay: TeV Scale LNV

d d u u e− e− F 0 S+ S+

LHC: pp ! jj e-e-

d d u e− e− u

0νββ - decay Dirac Majorana

Lmass = y ¯ L ˜ HνR + h.c. Lmass = y Λ ¯ LcHHTL + h.c.

TeV Scale LNV

Effective operators:

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C1 = g1

2 g2 2

g1 g2

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0νβ νββ-Decay: TeV Scale LNV

d d u u e− e− F 0 S+ S+

LHC: pp ! jj e-e-

d d u e− e− u

0νββ - decay Dirac Majorana

Lmass = y ¯ L ˜ HνR + h.c. Lmass = y Λ ¯ LcHHTL + h.c.

TeV Scale LNV

Effective operators:

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0νββ-decay as fu g geff = C1(Λ)1/4 . We use a prospec

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0νβ νββ-Decay: TeV Scale LNV

e− e−

Benchmark Sensitivity: TeV LNV Dirac Majorana

Lmass = y ¯ L ˜ HνR + h.c. Lmass = y Λ ¯ LcHHTL + h.c.

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F S S

  • T. Peng, MRM, P. Winslow 1508.04444

A(Z+2, N-2) A(Z, N)

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0νβ νββ-Decay: TeV Scale LNV

e− e−

Benchmark Sensitivity: TeV LNV Dirac Majorana

Lmass = y ¯ L ˜ HνR + h.c. Lmass = y Λ ¯ LcHHTL + h.c.

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F S S

  • T. Peng, MRM, P. Winslow 1508.04444

Present Tonne scale

A(Z+2, N-2) A(Z, N)

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0νβ νββ-Decay: TeV Scale LNV

e− e−

Benchmark Sensitivity: TeV LNV Dirac Majorana

Lmass = y ¯ L ˜ HνR + h.c. Lmass = y Λ ¯ LcHHTL + h.c.

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F S S

  • T. Peng, MRM, P. Winslow 1508.04444

Present Tonne scale Nuc & had matrix elements

A(Z+2, N-2) A(Z, N)

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0νβ νββ-Decay: TeV Scale LNV

e− e−

Benchmark Sensitivity: TeV LNV Dirac Majorana

Lmass = y ¯ L ˜ HνR + h.c. Lmass = y Λ ¯ LcHHTL + h.c.

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F S S

  • T. Peng, MRM, P. Winslow 1508.04444

Present Tonne scale LHC: ee jj

A(Z+2, N-2) A(Z, N)

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0νβ νββ-Decay: TeV Scale LNV & mν

Dirac Majorana

Lmass = y ¯ L ˜ HνR + h.c. Lmass = y Λ ¯ LcHHTL + h.c.

Implications for mν :

Controls mν

Schecter-Valle: non-vanishing Majorana mass at (multi) loop level Simplified model: possible (larger) one loop Majorana mass

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0νβ νββ-Decay: TeV Scale LNV & mν

Dirac Majorana

Lmass = y ¯ L ˜ HνR + h.c. Lmass = y Λ ¯ LcHHTL + h.c.

Implications for mν :

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Signal mν (loop)

Ton Scale A hypothetical scenario

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0νβ νββ / LHC Interplay: Matrix Elements

e− e−

Benchmark Sensitivity: TeV LNV Dirac Majorana

Lmass = y ¯ L ˜ HνR + h.c. Lmass = y Λ ¯ LcHHTL + h.c.

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F S S

  • T. Peng, MRM, P. Winslow 1508.04444

Assume GERDA present limit & different Nuc/Had MEs

A(Z+2, N-2) A(Z, N)

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0νβ νββ / LHC Interplay: Matrix Elements

e− e−

Benchmark Sensitivity: TeV LNV Dirac Majorana

Lmass = y ¯ L ˜ HνR + h.c. Lmass = y Λ ¯ LcHHTL + h.c.

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F S S

  • T. Peng, MRM, P. Winslow 1508.04444

Assume GERDA present limit & different Nuc/Had MEs

C h a l l e n g e

A(Z+2, N-2) A(Z, N)

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0νβ νββ-Decay / LHC Comparison: Details

  • LHC: Backgrounds
  • LHC energy scale ! 0νβ

νββ-decay scale: running

  • 0νβ

νββ-decay: hadronic & nuclear matrix elements

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LHC Backgrounds: Charge Flip

e+ transfers most of pT to conversion e- ; Z / γ* + jets ! apparent e- e- jj event e+ e+ e- Z e- g g

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LHC Backgrounds: Charge Flip

e+ transfers most of pT to conversion e- ; Z / γ* + jets ! apparent e- e- jj event e+ e+ e- Z e- g g

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Looks like SS dilepton

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LHC Backgrounds: Jet Fakes

Jet depositing energy in EM calorimeter

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Energy Scale Evolution

Running

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d d u u e− e− F 0 S+ S+

LHC: pp ! jj e-e-

d d u e− e− u

0νββ - decay

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Energy Scale Evolution

Low energy: QCD Running Assuming Ck = 1 at µ = 5 GeV ! Effective DBD amplitude for O1 substantially weaker for given LHC constraints

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Hadronic & Nuclear Matrix Elements

Nuclei

43 d d u e− e− u

Quarks & leptons Hadrons & leptons

e - e - π - π -

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0νβ νββ-Decay: TeV Scale LNV

e− e−

Benchmark Sensitivity: TeV LNV Dirac Majorana

Lmass = y ¯ L ˜ HνR + h.c. Lmass = y Λ ¯ LcHHTL + h.c.

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F S S

  • T. Peng, MRM, P. Winslow 1508.04444

A(Z+2, N-2) A(Z, N)

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0νβ νββ-Decay: LNV? Mass Term?

e− e−

TeV LNV Mechanism

Dirac Majorana

Lmass = y ¯ L ˜ HνR + h.c. Lmass = y Λ ¯ LcHHTL + h.c.

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NR WR WR

  • Majorana mass generated at

the TeV scale

  • Low-scale see-saw
  • Radiative mν
  • mMIN << 0.01 eV but 0νββ-signal

accessible with tonne-scale exp’ts due to heavy Majorana particle exchange

A(Z+2, N-2) A(Z, N)

LRSM

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LRSM

  • W. Rodejohann, INT ‘17
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LRSM

  • W. Rodejohann, INT ‘17

WR - NR

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0νβ νββ-Decay: TeV Scale LNV

LHC Production & 0νββ-Decay Dirac Majorana

Lmass = y ¯ L ˜ HνR + h.c. Lmass = y Λ ¯ LcHHTL + h.c.

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Helo et al, PRD 88.011901, 88.073011

76Ge τ (0ν)

LHC exclusion

LHC: SS Dilepton + Dijet

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LRSM

  • W. Rodejohann, INT ‘17

BSM scalars

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LRSM

  • M. Nemevsek ACFI ‘17
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LRSM

  • M. Nemevsek ACFI ‘17

Note: flavor handle at colliders !

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LRSM Scalars: Future Colliders

  • Y. Zhang
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LRSM Scalars: Future Colliders

  • Y. Zhang

Majorana mass

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  • III. RH Neutrinos
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LNV Mass Scale & 0νβ νββ-Decay

A(Z,N) ! ! A(Z+2, N-2) + e- e-

Underlying Physics

  • 3 light neutrinos only: source of neutrino

mass at the very high see-saw scale

  • 3 light neutrinos with TeV scale source of

neutrino mass

  • > 3 light neutrinos
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RH Sterile Neutrinos

  • E. Cazzato
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RH Sterile Neutrinos

  • E. Cazzato
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RH Sterile Neutrinos: LHC Prompt

  • E. Cazzato
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RH Sterile Neutrinos: LHC Prompt

ATLAS: 1506.06020 νSM LRSM pp ! ll jj

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Long Lived RH Neutrinos

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  • P. Mermod

Mixing UαN

  • E. Izzaguire & B. Shuve
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Long Lived RH Neutrinos

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  • P. Mermod

Mixing UαN

  • E. Izzaguire & B. Shuve

UαN ∼ mD MN

UαN ∼ rvL vR − mν MN

Type I see-saw: νSM Type I & II see-saw: LRSM

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Long Lived RH Neutrinos

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  • P. Mermod

Mixing UαN

  • E. Izzaguire & B. Shuve

BAU from Leptogenesis

  • Drewes et al ‘16
  • Lower bound < 10-10
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Long Lived RH Neutrinos

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  • P. Mermod
  • E. Izzaguire & B. Shuve

Mixing UαN

Excluded See also: Helo, Kovalenko & Hirsch

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RH Sterile Neutrinos: Future Colliders

  • E. Cazzato
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RH Sterile Neutrinos: Future Colliders

  • E. Cazzato
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RH Sterile Neutrinos

  • O. Fischer, ACFI ‘17 Workshop
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RH Sterile Neutrinos

  • M. Drewes
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Lecture V Summary

  • High energy colliders provide a powerful means of

probing dynamics of neutrino mass generation if it is associated with physics at or below the TeV scale

  • The LHC along with future e+e- and pp colliders provide

LNV probes that are complementary to 0νββ-decay

  • The observation of LNV in both 0νββ-decay and high

energy collider searches would indicate the energy scale for neutrino mass generation lies at or below the TeV scale

  • The collider discovery of other ingredients in neutrino

mass models would help unravel one of the key open problems in fundamental interaction physics