Indirect reach of the heavy MSSM Higgs boson mass scale by precise measurements of Higgs boson decay...
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Transcript of Indirect reach of the heavy MSSM Higgs boson mass scale by precise measurements of Higgs boson decay...
Indirect reach of the heavy MSSM Higgs boson mass scale by precise
measurements of Higgs boson decay branching ratios at future linear colliders
Mitsuru Kakizaki (University of Toyama)
April 20, 2015 Mitsuru KAKIZAKI 1
Asian Linear Colliders Workshop (ALCW2015), 20-24 April 2015 @ KEK
In collaboration with Shinya Kanemura, Mariko Kikuchi, Toshinori Matsui, Hiroyuki Taniguchi and Hiroshi Yokoya (U. of Toyama)
Work in progress
Motivation
April 20, 2015 Mitsuru KAKIZAKI 2
Unsolved questions include: Hierarchy problem Is the Higgs boson elementary or composite? Dynamics behind the EW sym. breaking? Origin of the Higgs coupling? Is the Higgs boson solitary?
Higgs boson = Window to New Physics
Hints of new physics are obtained by investigatingproperties of the discovered Higgs boson
Discovery of a Higgs boson at the CERN LHC The Standard Model (SM) is established
as a low-energy effective theory below GeV
This is not the end of the story
An SM-like Higgs boson The SM Higgs boson
Strategy
April 20, 2015 Mitsuru KAKIZAKI 3
This talk:
The indirect heavy Higgs mass reach at the ILC can be higher than the direct reach at the LHC
Precise prediction of the Higgs couplings is important
New physics effects are left in the Higgs couplings
New physics scale can be determined New models can be distinguished
The indirect heavy Higgs mass reach is obtained through the ratio of the Higgs decay rates measured at the ILC
In the Minimal Supersymmetric Standard Model (MSSM) ,we evaluate Higgs boson branching ratios at 1-loop level
Fingerprinting of the Higgs couplings:
: SM particle
New phys
ILC accuracy of : percent level [ILC Higgs White Paper]
[See Prof. Kanemura’s talk]
[For 2HDM, see Ms. Kikuchi’s talk; for composite models, see Dr. Kaneta’s talk][See also Prof. Endo’s talk]
Loop corrections to the MSSM Bottom Yukawa coupling
Bottom quark mass:
Bottom Yukawa coupling to the SM-like Higgs boson:
“Wrong Higgs coupling”
Bottom Yukawa interaction:
April 20, 2015 Mitsuru KAKIZAKI 4
[ILC Technical Design Report;ILC Higgs White Paper]
[Hall,Rattazzi,Sarid(1994);Hempfling(1994);Eberl,Hidaka,Kraml,Majerotto,Yamada(2000);Haber,Mason(2008);Endo,Moroi,Nojiri(2015), ...]
- SUSY breaking
MSSM Higgs sector:: SM-like Higgs boson
: MSSM heavy Higgs bosons
Properties of the Bottom Yukawa coupling
There are two new mass scales in the MSSM:
- SUSY radiative corrections decouple
In the limit of large with fixed
In the limit of a large heavy Higgs boson mass
April 20, 2015 Mitsuru KAKIZAKI 5
- SUSY loop corrections do not decouple for small and are enhanced for large , (in sharp contrast to the type-II two-Higgs-doublet model)
Numerical Analysis
Imposed conditions :
Superparticle mass bounds obtained at the LHC
FeynHiggs2.10.3 is used [www.feynhiggs.de: Hahn,Heinemeyer,Hollik, Rzehak,Weiglein,Williams]
1st Neutralino is the lightest supersymmetric particle
Mass universality for the 1st and 2nd generation sfermions
Simplifying assumptions :
The Higgs boson masses and mixing angle are computed at 2-loop level in the on-shell scheme
Higgs boson decay rates are computed at 1-loop level[Williams,Weiglein(2008)]
CP conservation; No color or charge breaking
April 20, 2015 Mitsuru KAKIZAKI 6
No negative sfermion mass squared
Universal A-parameters:
MSSM Parameters and Constraints
Reference point:
Scanned parameters:
Constraints:
April 20, 2015 Mitsuru KAKIZAKI 7
Input parameters:
(Common)(Common)
Heavy MSSM Higgs Mass Reach at ILC 500
To cancel uncertainties of the production and total decay rate,we consider the ratio of branching fractions:
ILC 500
April 20, 2015 Mitsuru KAKIZAKI 8
ILC sensitivity:
[ILC Higgs White Paper(2013)]
[ATLAS (2014)]
Heavy MSSM Higgs Mass Reach at ILC 500
To cancel uncertainties of the production and total decay rate,we consider the ratio of branching fractions:
ILC 500
April 20, 2015 Mitsuru KAKIZAKI 9
ILC sensitivity:
[Morinaga, JPS 70th
Annual Meeting (2015)]
[ATLAS (2014)]
[ILC Higgs White Paper(2013)]
Heavy Higgs Mass Reach (Luminosity Upgrades)
April 20, 2015 Mitsuru KAKIZAKI 10
The indirect reach through the Higgs coupling measurements can be higher than the LHC direct observation limits
The indirect reach of the MSSM heavy Higgs boson mass can be significantly extended, compared to the tree-level results
ILC 1000 LumiUp:
[ILC Higgs White Paper; ATLAS (2014)]
ILC 500 LumiUp:
Heavy MSSM Higgs Mass Reach (Luminosity Upgrades)
April 20, 2015 Mitsuru KAKIZAKI 11
[ILC Higgs White Paper; ATLAS (2014); Morinaga, JPS 70th Annual Meeting (2015)] The indirect reach through the Higgs coupling measurements
can be higher than the LHC direct observation limits The indirect reach of the MSSM heavy Higgs boson mass can
be significantly extended, compared to the tree-level results
ILC 1000 LumiUp: ILC 500 LumiUp:
We have evaluated SM-like Higgs boson branching fractionsincluding loop corrections in the MSSM
Summary
April 20, 2015 Mitsuru KAKIZAKI 12
The indirect heavy MSSM Higgs reach at the ILCcan be higher than the direct limit at the LHC
Due to the non-decoupling effects, of the Higgs couplings significantly deviate from the tree-level predictions
Fingerprinting of Higgs boson couplings is a powerful tool toexplore and distinguish models explaining dynamics ofthe EWSB (MSSM, NMSSM, Composite models, ...) and should be encouraged
The indirect heavy MSSM Higgs mass reach through the ratio of the SM-like Higgs decay branching ratios is shownat each ILC stage
Backup slides
April 20, 2015 Mitsuru KAKIZAKI 13
Determination of the Higgs Boson Branching ratios at the ILC
April 20, 2015 Mitsuru KAKIZAKI 14[ILC Higgs White paper (2013)]
Expected accuracies for cross section times branching ratiofor the 125 GeV Higgs boson:
Determination of the Higgs Boson Couplings at the ILC
April 20, 2015 Mitsuru KAKIZAKI 15
[ILC Higgs White paper (2013)]
Expected accuracies for model independent determinationof the 125 GeV Higgs boson couplings:
Heavy MSSM Higgs boson search at the LHC
[arXiv:1409.6064] [arXiv:1408.3316]
April 20, 2015 Mitsuru KAKIZAKI 16
Exclusion limit at the LHC through
Expected Heavy MSSM Higgs Boson Mass Reach at the LHC
[ATLAS-PHYS-PUB-2013-016]
5 sigma direct discovery potential of the MSSM heavy Higgs bosons at the LHC through:
April 20, 2015 Mitsuru KAKIZAKI 17
Expected Heavy MSSM Higgs Boson Mass Reach at the LHC
[From Morinaga, JPS 70th Annual Meeting (2015)]
Expected 95% CL exclusion limit at the LHC ATLAS
April 20, 2015 Mitsuru KAKIZAKI 18
Wrong-Higgs Yukawa interactions
April 20, 2015 Mitsuru KAKIZAKI 19
[Haber,Mason(2008)]
1-loop diagrams contributing to the wrong-Higgs Yukawa interactions:
3-point scalar interactions:
Yukawa couplings in the MSSM
Radiative corrections to the bottom Yukawa coupling :
April 20, 2015 Mitsuru KAKIZAKI 20