Minimal left-right symmetry for electroweak interaction.

See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/280690847

Minimal left-right symmetry model for
electroweak interaction
Conference Paper · September 2007

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1 author:
Asan Damanik
Universitas Sanata Dharma
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2noJoglalnternationalPhysics
Conference
"EnhoncingNetwork ond Calloborotion Developing
Researchond Educationin Physicsand Nuclear Energyo
September6-9, 2007,Yogyakarta-lndonesia

ORGANIZING
COMMITTEE
The Advisors board
.
.
'
.
'
'
.


Prof"lr. Y. Sardjono(P3TM-lndonesia)
Prof.Dr. ShoichiKai(KyushuUniversity-Japan)
Prof.Dr. MuhamadMatSalleh(Universiti
Kebangsaan
Malaysia)
Prof.Suparwoto(UNY-lndonesia)
(UGM-lndonesia)
Prof.Dr. Kusminarto
Dr.KamsulAbraha(UGM-lndonesia)
(UGM-lndonesia)
Dr.JaziEkolstianyanto

The Technical Program Committee
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:
Dr. Sismanto
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EdiHartantyo,

M.Si
Treasurer:
Dra.Chotimah,
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llonaUsuman,M.Kom
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Dr. KuwatTriyana
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Harsojo,M.Sc.
AgusSupriyanto,
M.Si (UNS)
AriDwiNugraheni,
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AhmadKusumaatmaja,
S.Si
ScientificProgram:
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Publication
:
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CONTENTS
ORGANIZING
COMMITTEE
FOREWORDS
CONTENTS

i
ii
iv

PAPERS
Keynofe Speoker

Aulhor(s)

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Nucleor Low ond Regulotionin
Indonesio

Poge

I

Dr.SukormonAminjoyo

2

Prot.Ren-ToiChiong,
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KS06

Dr.BoekJong-Bok

NPPStotusond ProspectIn Koreo

KSOI0

Dr.YoshikiHidoko

Stotisficol
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KSOI2

Prof.Dr.Yoshitsugu
Tomokiyo

Chorocterizotionof NonoStructuresin Moteriolsby
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KSOI5

5

Dr.HoriniSosioti

Focusedlon Beom Techniques
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Moteriols

KS02l

7

Dr.YusrilYusuf

LiquidCrysiolElostomers;SwellingKS026
Dynomics,Electromechonicolond
ElectroopticolEffects

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Prof.Dr.MuhomcrdMot
Soileh

Fobricotionof Orgonic Light
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I

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NEOI

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Mitroyono,T.Pierero,
B.W.M.Moeskops,S.
Persijn,
H. Nous,F.J.M.
Honen,M.A.J.Wosono,
Muslim,ond W. Rochmoh

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NEo4

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D- Lelonoond M.A.J.
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THol5

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2ndJogjo InlernotionolPhysics
Conference
ond Colloborolion Developing Reseorchond Educotbn in Physicsand Nucleor Energy"
September 6-9,2@7, Yogyokorto-lndonesio

Hermonto
l3

BombongHerulswonto

Leorningof MixlureModelsbosed
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l4

UmiKhoirunnisyoh

Determinotionof Coherent
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ScotteringAmplitude of ArsenicUsing
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l5

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A SimpleMethod to Determinethe
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AliYunuR
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TH0l9

COMPUTATIONAI.
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20 Mutio Delinoond
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22 DonielSetiodikorunio

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Cp023

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2"dJogjo InternotionolPhysicsConference
ond Colloborotion Developing Reseorchond Educotion in Physicsond Nucleor Energy"
Seplember 69, 2007.Yogyokorlo-lndonesio

23 ViskoIndoV

Developmentof TheObject
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Meosurement
Softwore

CP030

24 PekikNurwontoro

RobustComputotion
of the Gount
Coefficients

CP034

NANOTECHNOTOGY

No

Autho(s)

25 A. Bohtior

26 ldo Sriyonti,Leni
Morlino,Mikrojuddin
Abdulloh,ond
Khoirunijol
27 W.B.Nurdinond K.D.
Schotte
28 Aripin

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Longmuir-Blodgett-Kuhn
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Filmsof AzobenzeneContoining
PolyomicAcid for LiquidCrystol
Opticol Switching

Poge
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ElectricolConductivity of Nd-CeOz
NonoporticlesPrepored by Simple
PolymerHeoiingMethod

NT07

Applicotionof Microcononicol
Temperotureto TheSpinCrossover
of Fe-CoCompounds

NTOII

Chorocterizotionond Electricol
Conductivity Behoviourof
PolypynoleConducting Polymer

NT0l6

29 Ahmod Kusumootmojo, structure Dependence of Electricol
Ari Dwi Nugroheni,
Chqrocteristicof Orgonic ThinFilms
Sudormiotiond Kuwot
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Triyorlo

NT020

MATERIAT
SCIENCES

No
Aulhor(s)
30 ArisDoyonond
Susilowoti
3l

susilowotiondAris
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Poge

ConductivityProperties
of polymer
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MSOI

opticolProperiiesof polymerFilms
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Chlorinelnodiotedwith
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Ms06

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2ndJogio InlernotionolPhysicsConference
ond Colloborqtion Developing Reseorchand Educolion rn Physicsond Nucleor Energy"
Seplember 6-9, 2007.Yogyokorto-lndonesio

32 Moh. Yosin,S.W.Horun,
Kusminorto,
Koryono,H.
Ahmod

Constructionof Opticol Fiber
DisplocementSensorUsingon ACModuloted LightSource

MS0lI

33 Supriyono

TheInfluenceof ( Voluein
ShokedownPhenomenofrom
Elostic- PlosticProblems

MSOI4

34 Horsojo

CriticolCunentDensityon Two
Dimensionol
Superconductor
HovingColumnorDefecl

MSOIZ

35 Bombong Murdoko Eko
Joti,lrwonto,Lukmon
Hokim

TheChorocterisotionof Some Liquid
ond SolidStoteMedium to the

Attenuotion
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levelof Sound MS02l

GEOPHYSICS
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36 BudiEkoNurcohyoond
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3D complex seismic Attribut Bosed
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37 Sudormoji

SeismicRoyTrocingIn Heterogenous GpO4
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38 Edi Hortontyo

A Verificotionof plone Wove
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GPOIO

39 Novi Rohmowoti,Tjohyo
NugrohoAdji,ond
LonggengWohyu
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GroundwoterQuolitychonges Due
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40 Sismonto,Eddy
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43 Udi Hormoko
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Minimal Left-Right symmetry Modet for ElectroweakInteraction
AsanDananit/''", Mina satriawan2, pramudita Anggraitf, Arief Hermanto2
'Department
of Plrysics,SanataDharma University,
III
USDpaingan, Maguwoharjo,Sleman,yognkarta, Indonesia
$mpus
zDepartmentof physics,
racitty of lviathematicsan{Natural sciences.

'r,,,",ff
fi:!,I:f,y#';;:y;;i{u#;';'rWff
:';*^",,"

Abstratt
Foll_owing the procedure in the Glashow-lYeinberg-Salan(GWS) model
for electroweak
interaction,by using two doubletsand one inducedbidoubletHiggs
fietds as a result oftie interactionsof
the two doublets,we evaluatethe predictive power of the lrftlri7it symnetry nodel basedon S(J(2)1x
SU(2)px U(l) gaugegroup to thegauge bosonsmasses,leptons masses,
and the structure of eharowiak
interaclions-.Byh b.iloublet and doubletHiggsfields haie the contribution to the gauge ioro^
^ r",
a|ter WmeW breaking.Meanwhile,leptonsmassesarise only
from the bidoubletitgtli fuU. Tlw parity
uiolatioytcoild be associatedwith the mixing of the chargei gauge bosow n^sii yron tne
iiaucia
bidoubletHiggs.
Keywofds: Ieft-right symmetrymodel,electroweakinteraction,doubletand bidoubtet.
*Conesponding
author
E-mai I : [email protected]
I. Introductbn
Even though the Glashow-WeinbergSalam(GWS) modelfor electroweakinteraction
based on SU(2[ xU(l\ gauge group very
successfulphenomenologically
[l-3], but many
fundamgntal problems i.e. fie responsible
mechanismfbr generatingthe neutrino masses,
the dolninafion of the V-A over V+A
interactipm 4t low energy, and the responsible
mechanismfor the doubletleptonup.down mass
differenCecould not be explained by GWS
model. The needfor the extensionof the GWS
modelcomesfrom the conclusionthat neutrinos
have a mass as an implication of the detected
neutrinooscillationsphenomenafor both solar
andatmOsphetic
neutrinos[4-10].
ManNtheoriesor models for extension
of the GIWSrnodelhavebeenproposed.Oneof
the intpresipg models is the Left-Right
symmetrymodel basedon SU(2)r x SU(2)xx
U(l) gasge group proposedby many authors
Irl this paper,we use the left-right
[l-15].
symmetrymodel basedon SU(2)r x SU(2)ax
U(l) galhgegroup with two doubletsand one
bidoubletHiggs fields (as a result of the two
doublets interaction) to break the SU(2[ x
SU(2)px U(l) gaugegroupdownto U(l)",. The
leptonfiglds to be represented
as doubletof an
SU(2) for both left and righr fields to makethe
full senseofthe left-rightsymmetrymodel.

THOI5

The paper is organizedas follows: in section II
we presentour main assumptionsfor the leftright symmetrymodel, in sectionIII we evaluate
the gauge bosons masses, in section IV we
evaluate the leptons masses,and finally in
sectionV we give a conclusion
II. The Model
In our model, the left-right symmetry
model for electroweakinteraction basedon the
SU(2)1x SU(2)Rx U(l) gaugegroup wirh the
assumptionsand the particles assignment as
follows:
l. Two primaryHiggsfieldsaredoubletof

su(2):

", =l.;.J'
r-=l;') (r)
u

-(or)

/.-\

2. The secondarybidoubletHiggs field {
could be producedfrom the interaction
of thetwo primaryHiggsfields,that is:

a:a,)=(n' c,l
a=(t.n
'

(2)

V ' = l - 1 , \ r n = l_ l

(3)

l.boc- bodo) (r- ,o )
3. The leptonsfieldsarr doubletof SU(2)
for both left andright fields:
(v )
/v \

\e )t
\e )r
4. Both leptonsand gaugebosonsmasses
are generatedvia symmetry breaking

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when Higgs fields develop its vacuum
expectation values similar to the
symmetrybreakingin the GWSmodel.
By applyingthe aboveassumptions
and
particlesassignment,we could break the leftright symmetrymodelbasedon SU(2)px SU(2h
x U(l) down to U(l),* directly as shown
schematically
below:

where {,

md 4, arethe third components
the
weakisospingenerator:T, =T,12,
Accordingto the Eqs. (a) and (5), the
Higgs fields have the following quantum
numbers:

x r(1,0,t\x
^(0,;,r)p(;,;,0) (q)
andthe leptonsfields fansform as:

SU(2[ x SU(2)axU(l)

1 " 1 .Iob ) * o
(-r^)* 0

III. The GaugeBosonsMasses
From Eq. (4), we can see that the
relevantgaugebosonmasstgrmsas follow:

{
u(l)*

The vacuum exp€ctationvalues of two
doublets and one bidoublet Higgs could
contribute to the gauge bosons masses.
Meanwhile, the leptons masses(in Yukawa
term) only emergefrom the vacuumexpectation
value of bidoublet Higgs, becausethe leptons
fields tp, and wr to be doubletof SU(2),then
only the Yukawa term with bidoublet Higgs
salisfiesgaugeinvariancc. Thus, the complete
Lagrangiandensitycould be reads:

r^*=l(trtr*-.4ttrE,l'
*l(-+r.w*-irt,V^l'(8)
+rl!+tw*-+YB,M'
+r,l(?ww-+yB,M'
By substitutingthe vacuumexpectation
valuesofthe Higgsfields:

/o\,. (o o\

fo),

(o)=|.;,)
r,,)=laJ'
r+)=[a]
into Eq. (8), we obtain:

pi
7 = -! WonV - +Y!*IF tn -+ Bt, Bp'

u* =+lr'tWil * @,11
]*o'(sw)- s'a,f
- s,Bul
* r,a,(ni^l* @,;ll*a,Gwfi

+Vry,8ou- t c.y,n- t ruob,
- t rurb^
+V*yutoo- t c.w,o

*s'b'.*W;"1
.ftr;"|
-@;"ll
*s'(p'- ttrlr;"|
. @kl. @;lt

(4)

(9)

By defining:

+r,]ftar-trw*-+tt,M'
*rlfta,-tr.wu,-+vB,M'
-V(X

(7)

v,Q,o,ol rg^(o,z,o)

I

+l!a,-irww-+tn,V)'
*l$a,-*tw* -ttu,V.l'

(5)

Q=7,,+7,^+!

w; =hQrL+twi\w; =#(wk+iwrt\
-

-pL

cwi-g'BuL r-;-----';

,lc' + c' '

L,X R,d.7-(Cgrpty^+nc)

,"un

sw:n-g'Bun
f--:-----=

,ls' +s' '

" _g' I{ i+gB*, nttR
" _g' W fi+gB*
'

where g, = gn= g are the SU(2) couplinggg'
is the U(1) coupling,Tu(lr=Q,I,2,3) are the
Dirac matrices, T's are the Pauli spin
matrices,fl;gr,X^,q; is the Higgs potential,Y
is the hypercharge
(I =B-L), and G is the
Yukawacoupling.
The elsctric chargeoparator Q satisfiesthe
relations:

,lg"+s"

^IV.F

Z',n=W1,,,,Z',,^=lYk,
m v , =sb
| , * r , = 7sd
, frt=0,

*r" =tbGl*s" ,mz.=+dG' 4" ,
frr" = *'r^ = ilr,, = frr,* =iSr[p'

*f

,

(10)
THOI6

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thenEq.(9)rcads:

* m$rw
Lbo,;w ; + mfl^w
|w;
+m|,w;w; +m'j^w;w;
+m|,2*z! +ml"z*zl

interaction)to the electroweakinteractionis only
around0.0157u In this scheme,the domination
of the V-A interactionover V+A interaction for
charged curent at low energy could be
understood as an implication of the very
massiveness
of the mn^compared
to m*,, The
gaugebosonsfir?sscS2". in the maximalparity

(ll)

+ m)ArAP+ m),^z'^z'(

violation, only come from the doublet Higgs
freld X, as formulated in the GWS model and
supportedby experimental fact that the boson
massesemergeftom doubletHiggs field.

+ m'",,2'*z'!
or

Lo*=fu|,"
* *;;,yry;w;
I

t

r r \

+@h^+ m;^lY;W;
+ m),zr,z! + m'r^z*zN

lV. The Leptonsmrsses
The leptonsm?rsses
in our model arise
from tho symmetry breaking. The lepton mass
termis the Yukawatermin Eq. (4), that is:
(14)
L,=GV,(|W*

Q2)

+ mlApAt+ m'r,^z'*z';
+ m'r,rz'*Z';

By inserting the vacuum expectationvalue of
bidoublet Higgs, then we obtain the masses:
mu= Gp *l fie - Gs for neutrinoand electron
respectively. In our minimal left-right symmetry
model basedon SU(2[ x SU(2h x U(l) gauge
group the leptonsmasses(neutrino and electron)
arise only from the bidoublet Higgs vacuum
expectationvalues.
As long as we know, for leptonsmass€s
there is no experimental fact that force us to
choose a one kind of multiplet Higgs in the
Yukawaterm exceptdictatedby the requirement
of the Lagrangian density must be gauge
invariance. But, in the boson mass sector, the
representationof the Higgs fields to be SU(2)
doublet theoretically supportedby experimental
fact. Thus, we could use the inducedbidoublet
Higgs field asthe responsiblefield for generating
the leptonsmasses.

From Eq. (10), by following the
standard rnrodel of electroweak interaction
symmetry breaking procedure to the left-right
symmetrymodel and put the value of b : d, we
canseethat the resultedgaugebosonsmassesfor
both left and right bosonsare equal. To make
the left-right symmetry model relevant to the
electroweak phenomen4 many authors
fl4,15,161have takenthe value of b