towards higgs precision measurement at ilc what we have done ? & what we have to do?
DESCRIPTION
JAPAN LC Physics study group Higgs subgroup and KEK Minamitateya Collaboration Yoshiaki Yasui (Tokyo Management Collage). ACFA 7 th Nov.9-12 2004 Taipei Taiwan. Towards Higgs Precision Measurement at ILC What we have done ? & What we have to do?. Why Precision Measurement ?. - PowerPoint PPT PresentationTRANSCRIPT
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Towards Higgs Precision Towards Higgs Precision Measurement at ILCMeasurement at ILC
What we have done ? & What we have to do?What we have done ? & What we have to do?
JAPAN LC Physics study group Higgs subgroupand
KEK Minamitateya Collaboration
Yoshiaki Yasui(Tokyo Management Collage)
ACFA 7th Nov.9-12 2004 Taipei Taiwan
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Why Precision MeasurementWhy Precision Measurement??Why Precision MeasurementWhy Precision Measurement??
Direct measurement of self coupling
e+e- →hh X luminosity upgraded LHC (SLHC) (e+e- → hh X ) >> (e+e- → hhh X) Diouadi et.al
SM New Physics!! Higgs coupling may be a probe of BSM
What we can do after Higgs discovery @ LHC?
Higgs Precision Measurement EW SSB, mass generation
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MSSM at ILC? MSSM at ILC? MSSM at ILC? MSSM at ILC?
But .....
Decoupling limit MH0 ≈ MH
≈ MA0 >> MZ
hhh = (3gMZ/Cw)cos2sin()
3gMh02/2MW = hhh
SM (MhSM=Mh0)
hhhh = (3g2/Cw
2)cos22 3g2Mh0
2/4MW2
=SMhhhh(Mh
SM=Mh0)
Top Yukawa corrections are small Hollik et.al.
Higgs self coupling = gauge coupling?
We need more idea!!
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Non SUSY THD at ILC?Non SUSY THD at ILC?Non SUSY THD at ILC?Non SUSY THD at ILC?● Higgs self coupling as a probe of THD
Kanemura et.al LCWS’04 Paris
Baryogenesis talk by Senaha-san
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Extra-dim at ILC?Extra-dim at ILC?Extra-dim at ILC?Extra-dim at ILC?● Radion(graviscalar)-Higgs mixing
Ex:Warped Extra Dim model Randall Sundrum
radion mass mPlanck-warped scale
Dominici et.al. Nucl.Phys. B671 (2003)
=5GeV
zzh
hhh=5GeV
m > 2mh ⇒ hh bbbbmmh, >> 1⇒ gg 0
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Towards Towards Higgs Precision MeasurementHiggs Precision Measurement Towards Towards Higgs Precision MeasurementHiggs Precision Measurement
Machine design parameters(CM energy, Luminosity,etc.)
Detailed study of SM Higgs(Simulation, RC, etc.)
New Physics at ILC(SUSY,THD,LH,Extra-Dim,etc.)
feedback
this talk
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What we have done?What we have done?What we have done?What we have done?
Priority ⇒ Higgs Physics at TeV LC
1.Higgs self coupling⇒ We started (from 2002)
2.Top Yukawa
3.Heavy Higgs, etc.
etc..
etc..
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Assumption No bkg effects 100% signal efficiency
by Yasui et.al.
@@LCWS '02 Jeju KoreaLCWS '02 Jeju Korea
LCWS’04 Paris France Quick Simulation (includes bkg.) study!!
dominant for E
CM > 1TeV
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1. Parton level Generator (tree level ⇔ GRACE-loop)● LCGrace talk by Yasui, ACFA 6th India 2003
package for LC Higgs physics study: Mh ≤ 140 GeV e+e- 6f
based on the GRACE System ● Bases ⇒ Monte Carlo integration ⇒ Cross section● Spring ⇒ Events generator
2. Hadronizer● Pythia (interface from Spring to Pythia6)
3. Simulator (Quick Simulation → Full Simulation)
4. Analysis
Our Strategy for simulation studiesOur Strategy for simulation studies
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Ecm = 1 TeV
main mode W-fusion
Higgs mass = 120 GeV
SM decay Br
ISR/BSR included
Signal & bkg event generator
LCGrace (BASES+SPRING)
Signal MC: X + hh
/SM from 0.0 to 2.0 with 0.2
step
Smearing simulation at parton level
Jet energy resolution ~ 30%/√E (GeV)
(detector R&D target value)
Simulation StudySimulation Study
ννhh quick analyses
only for hh decaying to 4b
Br(hh4b) ~ 47 %
for 120 GeV SM Higgs
Signal characteristics
Large missing energy, missing PtOnly 4 b jetsM1 jj ~ Mh M2 jj ~ Mh
No isolated lepton
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Signal and Background processesSignal and Background processes
Signal(for SM)
Main bkg processes 4b + missing
ννbbbb (~ ννZZ, ννZγ*)
ννbbh
(~ ννZh)
By LCGrace
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1. Likelihood selection bkg further reduction
2. Separate Zhh & fusion different dependence (positive/negative interferences)
3. Combine with Zhh analyses for s-channel process
4. Check hh invariant mass
5. hhh
measurements
ννhh Analysis Flowννhh Analysis Flow
dep. of cross-section
νeνehh
Zhh
/SM
L = 1 ab-1
ννbbbb
ννbbh =SM
=
Reconstructed ‘Higgs’ mass
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ννbbbb
Likelihood
ννbbh
ννhh
=
=SM
coun
ts
L = 1 ab-1
ννhh selection
(~ OPAL Higgs scheme)(~ OPAL Higgs scheme)
Missing mass [GeV]
‘Zhh’
‘fusion’
ννhh channel
coun
ts
Separate Zhh & fusion
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(= visible mass)
‘fusion-channel’
hh invariant mass [GeV]co
unts
ννhh
=
=SM
hh invariant mass [GeV]
coun
ts
‘Zhh-channel’
Zhh=SM
=2 SM
HH invariant mass distributionsHH invariant mass distributionsHH invariant mass distributionsHH invariant mass distributions
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Mh=120 GeV
Mea
sure
d /
SM
True /SM
95%CL upper bound
95%CL lower bound
67%CL range
Ilumi=1 ab-1
Pol beam= -80%
@1TeV
Mh=120 GeV(SM Higgs Br)
Use only hh4b(Br(hh4b)~47%)
Eff.(4b) 80%
By Yamashita et.al. LCWS 2004
hhh Measurement sensitivityhhh Measurement sensitivity
Precise study Radiative corrections are also important!! Systematic study of the RC for Higgs physics at LC with GRACE
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Radiative correction for Radiative correction for ee++ee--ZHH
GRACE Phys.Lett.B576(2003)152Zhang et al. Phys.Lett.B578(2004)349
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W for Mh=120GeV
QED for Mh=120 GeV
=(O())/(tree)-1
W
G=W
- 4r
r=2.267%
W
Radiative correction for Radiative correction for ee++ee--ννeeνν
ee HHHH
Yasui et.al. ECFA2004 Durham UK
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Single Higgs production
● e+e-ZH (full number of graphs = 341)
● e+e-ννH (1350) Phys.Lett. B559 (2003) 252-262 A.Denner et.al. PLB 560(2003)196, NPB 660(2003)289
● e+e-e+e- H (4470) Phys.Lett.B600(2004)65-76
top Yukawa
● e+e-t t H (2327) Phys.Lett. B571 (2003) 163-172 Y.You et.al.PLB 571(2003)85 A.Denner et.al. PLB 575(2003)290, NPB 68(2004)85
Multi Higgs production
● e+e-ZHH (5417) Phys.Lett. B576 (2003) 152-164 R.Zhang et.al.PLB(2004)349
● e+e-νeνe HH (19638) New results!! of 2 to 4
Weak corrections are sizable O(5-10)%
Recent progress on the loop calculationsRecent progress on the loop calculations
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A quick simulation study has been performed for Ecm=1 TeV
For Mh=120 GeV: measurement sensitivity (only hhbbbb only)
for =SM /SM=1.0 +0.13 -0.11 (1) 0.78 - 1.32 (95%CL)
/SM=0.6 0.6 +0.10 -0.07 (1) 0.45 - 0.77 (95%CL)
/SM=1.4 1.4 +0.14 -0.18 (1) 1.08 - 1.70 (95%CL)
SummarySummarySummarySummaryWhat we have done?
What we have to do?
Non-b decay of the Higgs increase sensitivity
Mh>140GeV W-par decay of the Higgs
ννhh 8f, 10f New version of Grace system
Radiative corrections (systematic study have been done)
sizable include in the event generator
New Physics study