contents 1. introduction 2. conclusions 3. analysis 4. results on operators 5. conclusions
DESCRIPTION
Presice measurement of the Higgs-boson electroweak couplings at Linear Collider and its physics impacts. Yu Matsumoto (KEK) 2009,1,21 ILC Physics Meeting @ KEK. V. Contents 1. Introduction 2. Conclusions 3. Analysis 4. Results on operators 5. Conclusions. V. H. - PowerPoint PPT PresentationTRANSCRIPT
Contents1. Introduction2. Conclusions3. Analysis4. Results on operators5. Conclusions
Presice measurement of the Higgs-boson electroweak coupling
s at Linear Collider and its physics impacts
H
V
V
Yu Matsumoto (KEK) 2009,1,21 ILC Physics Meeting @ KEK
In collaboration with K.Hagiwara (KEK) and S.Dutta (Univ. of Delhi)
1-1. Motivation
SM
・ Light Higgs scenarios
・ Heavy Higgs or Higgsless scenarios
・ W, Z-boson discovery・ top-quark discovery・ W,Z boson precision measurements
LHC LC
Tevatron LEP
・ LHC can probe light Higgs scenario・ precision measurements of the Higgs-boson properties
NP3
NP2
NP6
NP4
NP8
NP9
NP5
NP7
NP1 NP1
0NP1
1 NP12
NP13
New physics theories
1-2. Effective Lagrangian with a Higgs doublet
,8dim7dim6dim5dim LLLLLL SMeff
contribute to majonara neutrino mass
contribute to four fermion coupling (Proton decay, etc) purely gauge term (Triple gauge coupling, etc) Higgs electroweak couplings
New physics can be represented by higher mass dimension operators
We can write the effective Lagrangian including Higgs doublet as
)6(2 i
i
iSMeff
fLL
New physics effects. Here we consider only dimension 6
and the operators are …
We focused on this physics
are calculable in each particular modelsif
1-3. dimension 6 operators including Higgs
Dimension 6 operators
2 point function, TGC, vertices include Higgs boson
Precision measurement (SLC, LEP, Tevatron)
Triple gauge couplings (LEP2,Tevatron)
LH
C
LC
High energy experiments ( ) are important for the measurements of couplings
beam polarization plays an important role to obtain high accuracy
2. ConclusionsThe most accurately measured combinations of dim-6 operators are sensitive to the quantum corrections
ILC experiment can constrain completely different combinations of dim-6 operators from EWPM We can select new physics by multi-dimensional operator space
e
HZ
These accuracy of the combinations are not affected from systematic errors ex) luminosity uncertainty
GeVs 500
(EWPM)
(ILC our result)
2min
,
12min
,
2min
2
2min
2
12
)( )(
)()(
)()(
),,(
jijijik
k kSM
kjki
jiji
k kSM
ikkii
kkEXP
ikTH
kEXP
n
cVcLcc
L
cL
N
cNNcc
3-1. Optimal observable methodThe differential cross section can be expressed by using non-SM couplings
can be expressed in terms of non-SM couplings
)( i
iiSM c
d
d
number of event in the k-th bin for experiment and theory
2
,kSMkEXP LN
if is given, we can calculate
1V iciii Vc
The large discrepancy between and
makes larger errors become small 1VSM )(i
kii
ikSMkTH cLLN )(
3,2,1,,,,, 232 icccccc iWWZZiZZi
is 3-body phase space
3-2. Operators and Vertices, Form Factors
: EW precision, S and T parameter
: Triple Gauge Couplings
.)].))()(((2
[
]))()(([
)1(2
)1(
32
,32
1WW1ZZ)6(
2
chWWHWHc
WHWcm
g
VZHZHcVHZcm
g
WHWgmcZHZmg
cf
LL
WWWW
Z
Z
ZVZVZV
Z
Z
WZZ
ii
iSMeff
We exchange the operators into HVV interaction vertices as the experimental observables
※ are the linear function of
if iWWZZiZZi cccccc ,,,, 232
double-tag eeHZH production
3-3. Cross section
WW-fusion
iWWc
~ ILC phase I phase II
WW
W
f
f
fff 421 ,,
iZZc
BWBBWW
BW
fff
ff
fff
,
,
,,
,
421
double-tag eeHsingle-tag eeHZH production
iZcBWBBWW
BW
fff
ff
,
,
,
no-tag (ee)H 2c BWBBWW fff ,,
High
experiment
polarization
no-tag
(ee)H
s
if
VVf
BW ff ,
3-4. Luminosity uncertaintyHere we set
L is true luminosity
can be redefined as2
Luminosity uncertainty is absorbed into errors
WWZZ cc 11 ,
The correlation between and
is generated through luminosity uncertainty
ZZc1 WWc1
111 fcc ZZWW The measurement of
doesn’t depend on 1f
f
4-1. constraint on dim-6 operators (1)
① EWPM results
② ILC-I+ILC-II with
11200,01.0,0.0||,8.0|| fbLfPP totalee
③ ILC-I with 1700,01.0,0.0||,8.0|| fbLfPP totalee
④ ILC-I (250,350GeV) with
1700,01.0,0.0||,8.0|| fbLfPP totalee
1 dimensional
5 dimensional
1000,500,350,250:s500,500,100,100:L
500,350,250:s500,100,100:L
350,250:s350,350:L
4-2. Constraints on dim6-Operators (2)
combining with LEP and future experimentsEWPM will be also improved at ILC experiments
if
+
@ ILC
@ GigaZ
The results combining our HVV measurements at ILC and EWPM at ILC are
@ LEP2,Tevatron (present EWPM)
+
5. Conclusions
We obtain the sensitivity to the ILC experiment on 8 dim-6 operator space by using Optimal observable method
The expected accuracy of the measurements will be sensitive to quantum corrections as same accuracy as EWPM.And its constraints are in the multi dimensional space.
The t-channel processes of and at high energy experiment are important to measure and couplings
Hee Heeee
HHZHWW ,
Polarization is important to obtain high accurate measurement on coupling
HZ
Luminosity uncertainty affects measurements, but only one combination of the operators, is affected
WWZZ cc 11 ,
24 23 ff