Neutrinos and the LHC
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Transcript of Neutrinos and the LHC
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Neutrinos and the LHC
R. N. Mohapatra
June, 14-19, 2010
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Neutrino mass New physics beyond SM:
Two generic Issues: New mass scale to explain why
? How to understand the flavor puzzle : Why quark and lepton mixing patterns are so different ?
Low energy probes: Oscillations, , Probing this new physics at
LHC:This talk
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1. Scale of new physics Why is ? Seesaw
Paradigm:
Add heavy right handed neutrinos to SM and play seesaw:
Seesaw scale is the new physics scale !! Different experimental signatures depending on
Majorana or Dirac
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Type I seesaw Majorana
New scale -Neutrino majorana small nu mass natural since key parameter to test seesaw
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RMR
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Minkowski,Gell-Mann, Ramond Slansky,Yanagida, Mohapatra,Senjanovic,Glashow
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Inverse Seesaw Mostly Dirac i.e. add another
singlet
(RNM’86; RNM, Valle’86)
Seesaw testing parameter or larger;
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Seesaws without RH Nus
Type II (scalar triplet) Type III(fermion triplet) (Maag,Wetterich, Shafi, Lazaridis; (Foot, He, Lew, Joshi)
RNM,Senjanovic; Schecter, Valle)
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New seesaw related particles: Minimal case
Type I and Inverse seesaw: Right handed neutrinos:
Type II: Scalar bosons
Type III: triplet fermions:
If their masses (seesaw scale ) are sub-TeV, LHC is ideal machine for their search:
N
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Decay modes: RH neutrino : ~Dirac (Inverse) Majorana (Type I)
Scalar triplet (Type II)
Fermion triplet: (Type III)
N WlNWlN
WWll ,
l ZW ,
Wl0
,..Zl
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Collider Production: Type II and type III: New particles couple to W, Z and and can be produced via
, Type I and Inverse-N- SM singlets, do not couple to, W or Z-
Only production mode is via nu-N mixing.
0
N
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Testing Type II: Doubly charged member Striking signal
Production Decay
Final state: inv mass can be used to reduce bg.
LHC reach ~TeV; leptonic couplings give nu mass matrix (roughly) (Han, Perez, Huang, Li, Wang; Akyroid, Aoki; Azuelos, Mukhopadhyay,)
duuu ; WWll ,
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Signals of Type III Y=0, fermion triplet: (Bajc, Senjanovic, Nemesvec,..)
Like sign dileptons+ 4 jets
LHC Reach <TeV
0 Wl0
jj
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Type I, Inverse: Need Low energy bounds on = vs MN
Type I
Atre, Han, Pascoli, Zhang
Only observable for inverse seesaw forMN< TeV Situation different with gauge forces:
NFromNA3, CHARM,DELPHI, L3, NOMAD, double beta
decay
eN N
610N
N
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How plausible are new gauge forces for Type I or
Inverse case ? Type I : why seesaw scale below Planck scale: Local B-L symmetry Inverse seesaw case:
Why why not
Case for new Gauge symmetry compelling !!
LHC can see their signals !!
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What Gauge Symmetry ?
Standard model: gauge sym. Fermions:
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What Gauge Symmetry ?
Standard model: gauge sym. Fermions:
NR Gauge group:
New
LBRL USUSU )1()2()2(
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Parity an exact symmetry of nature
The weak Lagrangian of model:
Weak Lagrangian conserves Parity Low energy parity violation due to
RNM, Pati, Senjanovic 74-75
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ZWZW LRMM
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Bound on LR scale Most stringent bounds come from CP viol. Observables e.g.
depends on how CP is introduced: Two minimal scenarios Parity defined as usual:( ) minimal model: ;2 CP phases (An,Ji,Zhang,RNM
’07)
Parity as C (as in SUSY i.e. ) more CP (Maezza, Nesti Nemevsek,Senjanovic’10) phases
With SUSY: bounds weaker: > 1-2 TeV (An, Ji, Zhang’08)
Collider (CDF,D0) 640-750 GeV;
RW
MRL
c TeV4
TeVMRW
5.2
end,',
RCKML
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Bounds from Nu-less double beta decay
New contributions from WR-N exchange (only for Case I) (RNM, 86; Hirsch, Klapdor, Panella 96)
Diagram:
From Ge76:
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TeV Seesaw signal from Nu contribution: (Feruglio, Strumia, Vissani)
Inverse hierarchy Normal hierarchy (Rodejohann’s talk)
Punch line: Suppose long baseline
and nonzero signal for (+ RP if susy )
could be a signal of TeV WR and type I
0
0231 m
0
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LR type I seesaw at LHC WR and Z’: ;(Keung, Senjanovic; Han, Perez,Huang,Li, Wang; Del Aguila, Aguilar-Saavedra; de Blas,
Azuelos,
N-decay: (a) mixing and/or (b) exchange
type I : (a) negligible;
Signal: like sign dileptons+jets; no missing E
Background from
NlWdu R NNZuu '
jjlN
,...,, WWnjWZnjnjtt
TeVMRWN 4,10 3
N RW
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LHC Reach for WR(Ferrari et al’00 ; Gninenko et al, 07) Datta, Guchait, Roy’92
Maleza, Nemevsek,Nesti, Senjanovic
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Signals of LR Inverse seesaw
N mostly Dirac and
No like sign dileptons Possible displaced vertex
Distinguishes between Type I and Inverse seesaw;
310N lljjlN ,
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~50
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er
year
Mike Lamont
Expectations at the LHC
Physics updated from De Roeck
Luminosity projections from Jenni, 3/10
Z’(SSM)@1.5 TeV
Higgs@160 GeV
Higgs@120 GeV→
Large X-Dim@ 9TeV
Leptoquarks @ 1.5TeV
SUSY@ 3 TeV
SUSY@1 TeV)3( TeVWR
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Seesaw search at LHC and Grand unification
MSSM Type I
seesaw
(Kopp, Lindner, Niro, Underwood’09; Parida, Sarkar, Majee, Raichaudhuri’09)
TeV type I seesaw does not grand unify: Discovery of doubly charged Higgs or type I signal at LHC
will rule out GUTs.
GeVM BLU16
, 102
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TeV Inverse Seesaw (LR) does unify
New result! Inverse seesaw does unify –TeV WR and Z’
(Dev, RNM, 09; PRD; arXiv:
1003:6102);
New motivation to search for WR,Z’ at LHC !!
TeVMGeVM RBLU ,16 ;10
TeVmq 2,1
~
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Testing GUT Scale Type I Seesaw
In GUTs, type I seesaw scale is near GUT scale: no low energy tests. With susy, LHC tests possible: Neutrino
mixing lepton superpartners mixing flavor violating signals
(Porod, Hirsch, Romao, Valle, Moral)
01
01 ,
~ e 01
02
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Conclusion: Seesaw scale can be in the TeV range in very
reasonable class of theories (even SUSY GUTs) A likely model of TeV scale seesaw is left-right
sym. model - parity restored at TeV. Premium channel for probing WR and Z’ at LHC
are like sign dileptons or trileptons. Discovery of TeV seesaw signal will provide an
understanding of the origin of the second mass problem in particle physics, that of -will surpass in impact the discovery of the Higgs boson !!
m
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LR Z’ at LHC Z’ – first to show up at LHC; Current limit~TeV
(Langacker)
To tell it is related to neutrino mass (e.g. LR) is hard: couplings needed (Petriello, Quackenbush’09)
300 fb^-1-1000 fb^-1
Heavier the Z’, the harder it is.
TeVMTeVs Z 5.1,10 '