Doubly charged Higgs bosons at Hadron Colliders and neutrino mass hierarchy Mayumi Aoki (KEK)...
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Transcript of Doubly charged Higgs bosons at Hadron Colliders and neutrino mass hierarchy Mayumi Aoki (KEK)...
Doubly charged Higgs bosons at Hadron Colliders and neutrino mass hierarchy
Mayumi Aoki (KEK)
A.G.Akeroyd and M.A. PRD72,035011 (2005) (hep-ph/0506176)
Motivation
( Q=I3+Y/
2 ) 0
2
( ). . . .
2i j i jT
ij iL jL ij i j i j
l lL h Ci h c h l l h c
2/
2/0
The observed neutrino oscillation data predict nonzero neutrino masses and mixings.
• Higgs Triplet Model : SM + Δ SU(2)L Higgs triplet boson (Y=2)
GeVmH
001•LEP
The most striking signature of Δ would be the observation of H±±.
H±± →ℓi±ℓj
± strong search potential
• Hadron colliders
scatteringBhabha
eeHee
HHZee
** , jiH decay with
Motivation
CDF Collab. PRL93(2004)
GeV
GeVe
GeVmeeHH
136
115
133
HHZpp **,
Assuming B(H±±→li±lj±)=100%
240pb-1 of data collected at √s=1.96TeV
CDFIITevatron
)( WHH
•Single production of H±± HHWpp *
•Nonleptonic decay (for m H±±> m H± )
•H±±→li±lj± in light of neutrino data
We study the search potential for H±± at Tevatron in HTM.
only
1
B.Dion et al, PRD59 (1999)
E.J.Chun et al, PLB566(2003)S.Chakrabarti et al, PLB434 (1998)
J.F.Gunion et al, hep-ph/9610237
Higgs Triplet Model
Δ 0 develops a
VEV :
)eV 75.0 WMAP( , 2 iijij mhm
•Neutrino mass matrix
eV 10 10 roughly very : LFV 3 ijh
We are interested in
.~ M
03.0 10|1| 3
20
2
2
M
(*),5
,5
,00
00
WHHmmmHmmm
AHHH
HHAH
0 0
000 ,,,),( hAHHH Physical Higgs bosons
2 † † 2 2 † † 2 †1 2 3
† † † †4 5 2
( ) ( ) Tr( ) [Tr( )] + Det( )
( )Tr( ) ( ) ( . .)Ti
V m M
i h c
doublet SM Higgs :
HHWppHHZpp *** ,,Production of H±± at Tevatron
)(2)( HHppHHppH Total H±±cross section
Single H±± production can be as large as the pair production.Mass limit on mH±± increases significantly.
Decay of H±±
)8/(||)( 2 ijHji hSmH )()2(1 jijiforS
i
iji
ij mh 2
,
2 The total leptonic decay width depends on which solution to the neutrino mass hierarchy is realized.
Leptonic decay
real :)(2
13,2,1 i
Tij mVmmmdiagVh MNSMNS
3 2 1
2 1 3
21 2 3
~ ~ ATM
m m m
m m m
m m m m
Normal hierarchy (NH)Inverted hierarchy (IH)Degenerate (DG)
2/2
2/1
13
00
00
001
2/13/16/1
2/13/16/1
sin3/13/2
i
i
i
MNS
e
e
e
V
phases Majorana :phase Dirac
21
132
,:
16.02sin
GeV 20 HH mm eV2.0 im
Decay of H±±
)16/(36)( 342* GmMGWHH HWF G: phase space
factor
Nonleptonic decay H±± → H±W(* )
Current search strategy is
ineffective.
Current search strategy is effective. If H±± → ℓ± ℓ± are measured then the ratios of hij can be evaluated.
An order of magnitudeestimate of hij could be obtaiened.
HHmm
123 mmm : NH
Limit on mH±±
'''' )(2)2()( llllllll BHHppBBHHpp Bilepton cross section
case. violatingCP no and assume We 013
)(' jill llHBB
2009)(~GeV fb 1905 Hm
mH±± > 130 GeV (μμ)
: IH1 321 mmm
Majorana phase dependenceAssuming CP conservation, the following different patterns can be allowed.
or 0, 21
: IH2 321 mmm
mH±± > 138 GeV (ee) mH±± > 120 GeV (eμ)
: DG1 321 mmm
mH±± > 132 GeV (μμ)
: DG2 321 mmm
mH±± > 122 GeV (ee)
: DG3 321 mmm
mH±± > 105 GeV (eμ)
: DG4 321 mmm
mH±± > 115 GeV (μμ)
Summary
We have studied the search potential for H±± at Tevatron.
• Higgs Triplet Model : SM + Δ SU(2)L Higgs triplet boson (Y=2)
HHppHHpp ,
(*), WHllH ji
production
decay
We encourage a detailed experimental simulation of this decay mode at Tevatron.
significantly improves the search
potential for H±±
might be helpful to determine the absolute value of hij .
Neutrino mass spectrum might be distinguished by the leptonic decay mode.
LHC)()()( HHppHHppHHpp
H
Total H±±cross section
sensitivity up to 1 TeV