Upload
flann
View
48
Download
2
Tags:
Embed Size (px)
DESCRIPTION
Exploring SUSY models through quark and lepton flavor physics. Yasuhiro Okada(KEK/Sokendai) June 18, 2008 SUSY 2008, Seoul, Korea. Content of this talk. Quark and lepton flavor physics processes sensitive to the TeV scale physics. - PowerPoint PPT Presentation
Citation preview
1
Exploring SUSY models through quark and lepton flavor physics
Yasuhiro Okada(KEK/Sokendai)
June 18, 2008
SUSY 2008, Seoul, Korea
2
Content of this talk
Quark and lepton flavor physics processes sensitive to the TeV scale physics.
Study of quark and lepton flavor signals in various cases of SUSY models.
T.Goto,Y.O., T.Shindou,M.Tanaka, arXiv:0711.2935
3
Flavor in the LHC era
LHC will give a first look at the TeV scale physics. The mass of the Higgs boson alone is an important hint for possi
ble new physics scenarios. Flavor structure of the TeV scale physics is largely u
nknown. Patterns of the deviations from the SM predictions are a key to
distinguish new physics models. New flavor experiments are coming. LHCb, B physic
s at ATLAS and CMS, MEG, Super B, etc.
4
Quark flavor
B,D,K
Lepton flavorNeutrino mixing
LFV~0
EDM ~0
Relationship may be quite different for new physics contributions.
GUT
SUSY CP
slepton mixing
SM has a characteristic feature among various flavor and CP signals.
5
The Unitarity Triangle Even if CKM looks perfect, there are still room for new physics contributions of at least a few 10’s %.
Fit by tree level processes SM global fit
6
|Vub|,
Bd mixing and CP asymmetries
K and B(K)
Bs mixing and CP asymmetries
+
+
+
In order to disentangle new physics effects, we first need todetermine the CKM parameter by tree processes.
We know (or constrain) which sector is affected by new physics
Expected precision LHCb 5-10 deg (2fb-1: 1year)
Super B factory1-2 deg (50-75 ab-1)
Improvement on 3/ is essential
7
Rare B decays: Various tests of new physics
S(B->Ks)
Time-dependent CP asymmetry of penguin-dominated processes
A(b->s)
Direct CP asymmetry of b->s S(B->K*)
Time-dependent CP asymmetry of B-> K*
AFB(b->sll), AFB(B->K*g)
Forward-backward asymmetry of b->sll, B->K*ll
B(B->,B(B-> D
New phase
New phase
Right-handed operator
H-b
u
charged Higgs exchange
8
Expected precisions at Super B factory
CERN Flavour WS report: arXiv:0801.1833
Super KEKB study and SuperB CDR study; 50-75 ab-1
b-s transition
EW penguin
Charged Higgs
0(10%) physics (Now)=> 0(1%) physics (Future)
0.39 ± 0.17 0.61 ± 0.07 0.58 ± 0.20
−0.09 ± 0.24
error ~0.05-0.06
Current results
9
CPV in Bs system at LHCb Measurement of CP violation in the Bs system is a
major goal of the LHCb experiment. Many are parallel to the Bd system.
S(Bd->J/ Ks)
S(Bd->Ks)
S(Bd->K*)
Time dep. CP in Bs->J/ “Bs mixing phase”
Time-dep. CPV in Bs-> “b-s penguin phase”
Time-dep. CPV in Bs->“right-handed current”
M.Merk,a talk at CERM TH Institute, May 26,20082fb-1 (1year)
10
and Lepton Flavor Violation Sensitive to slepton flavor mixings
The MEG experiment will search for B(->e) up to 10-13. The current upper bound is 1.2 x 10-11.
One to two orders improvements are expected at a Super B factory for tau LFV searches.
S.Banerjee, TAU 06
B( )
Super B factory, 50-75 ab-1 arXiv:0801.1833
11
SUSY and flavor physics LHC experiments will be a crucial test for existence of S
USY. (Squark/gluino mass reach 2-3 TeV, A light Higgs boson)
The role of flavor physics is to determine the flavor structure of squark/slepton mass matrixes. (new sources of flavor mixing and CP phases)
Squark/slepton mass matrixes carry information of SUSY breaking mechanism and interactions at high energy scale (ex. GUT/Planck scale).
Diagonal tem: LHC/LCOff diagonal term: Flavor Physics
12
Different assumptions on the SUSY breaking sector
SUSY breaking
Minimal Flavor Violation (ex. mSUGRA)
SUSY GUT with see-saw neutrinos
Flavor symmetry
Effective SUSY
etc.
How to distinguish these models from factory observables?
13
Quark and lepton flavor physics in various SUSY models In order to illustrate how future flavor experiments are
useful to distinguish different SUSY models, we calculated various quark and lepton flavor observables in representative SUSY models.
Models
1. Minimal supergravity model (mSUGRA)
2. SUSY seesaw model
2. SU(5) SUSY GUT with right-handed neutrino
3. MSSM with U(2) flavor symmetry
Observables Bd-Bd mixing, Bs-Bs mixing. CP violation in K-K mixing (). Time-dependent CP violation i
n B ->J/Ks, B->Ks, B->K* ,B->.
Direct CP violation in b->s ,b->d
->e, ->, ->e
T.Goto, Y.O. Y.Shimizu, T.Shindou, and M.Tanaka,2002, 2004
T.Goto,Y.O., T.Shindou,M.Tanaka, arXiv:0711.2935
14
mSUGRSA with GUT/Seesaw Yukawa interaction
Quark Yukawa coupling Neutrino Yukawa coupling
Interactions at GUT/seesaw scale
Quark flavor signalsTime-dep CP asymmetries in
B->Ks B -> K*Bs->J/
Lepton flavor violation in->e->->e
L.J.Hall,V.Kostelecky,S.Raby,1986;A.Masiero, F.Borzumati, 1986, R.Barbieri,L.Hall,1994, R.Barbieri,L.Hall.A.Strumia, 1995, S.Baek,T.Goto,Y.O, K.Okumura, 2001;T.Moroi,2000; A.Masiero, M.Piai,A Romanino, L.Silvestrini,2001 D.Chang, A.Masiero, H.Murayama,2003J.Hisano,and Y.Shimizu, 2003, M.Ciuchini, et.al, 2004, 2007…
Yukawa interactions at the GUT scales induce quark and lepton flavor signals. In the SU(5) setup, the right-handed sdown sector can receive flavor mixing due to the neutrino Yukawa couplings.
15
Neutrino mass matrix (in the basis where yl is diagonal).
LFV mass terms for slepton (and sdown).
Effects of the neutrino Yukawa coupling
LFV mass terms and VPMNSis directly related when
(Minimal LFV)
Large solar mixing angle=> >eenhanced
16
If is somewhat suppressed, the B(->e) constraint becomes weaker, and a variety of flavor signals are possible.
• Non-degenerate MN
• Degenerate MN, but inverse hierarchy or degenerate light neutrino with 13~0.
J.Casas, A.Ibarra2001; J.Ellis,J.Hisano,M.Raidal,Y.Shimizu, 2002
We consider various cases for heavy neutrino and light neutrino mass hierarchy.
17
SUSY Seesaw model (without GUT)
Normal hierarchy Inverse hierarchy Degenerate (m1=0.1eV)
-ee
Degenerate MN (=4x1014 GeV)13 =0
Recent related works: L.Calibim, A.Faccica A.Masiero, S.K.Vepati, 2006L.Calibim, A.Faccica A.Masiero, 2006
-eis promising signal in the normal hierarchy case, and >can be alsolarge in other cases :
18
Degenerate MN and “Normal hierarchy” for light neutrinos :
e) can be close to thepresent bound even if the slepton mass is 3 TeV.
Contour in the m0 -M1/2 plane
ebound
e, >e branching ratios
SU(5) SUSY GUT
19
, evs. e
Lepton Flavor Violation in the non-degenerate MN case
B(e
B(
e
e
20
S(Bd->K*S= S(B->Ks)-S(B->J/Ks)
These asymmetries can be sizable if the squarks are within the LHC reach.
Time-dependent CP violation in Bd decays
Super BSuper B
21
S(Bs->J/ S(Bs->J/Ks) vs. B(->)
Recent works on Bs mixing:J.K. Parrym H-H. Zhong 2007; B.Dutta, Y.Mimura2008; J.Hisano Y.Shimizu, 2008.
LHCb
SuperB
Time-dependent CP asymmetry in Bs -> J/
22
MSSM with U(2) flavor symmetry The quark Yukawa couplings and the squark mass
terms are governed by the same flavor symmetry. 1st and 2nd generation => U(2) doublet 3rd generation => U(2) singlet
A.Pomarol and D.Tommasini, 1996; R.Barbieri,G.Dvali, and L.Hall, 1996; R.Barbieri and L.Hall;R.Barbieri, L.Hall, S.Raby, and A.Romonino; R.Barbieri,L.Hall, and A.Romanino 1997; A.Masiero,M.Piai, and A.Romanino, and L.Silvestrini,2001; ….
We do not consider LFV processes in this model
23
A( b->s
S(Bs->J/S(Bd->
S(Bd->K*
Various CP asymmetries are possible for the b-s and b-d transitions in the U(2) model
24
Summary table of flavor signals for mSUGRA, SUSY seesaw, SUSY GUT, MSSA with U(2) flavor symmetry
LFV
b-s and b-d transitions
Pattern of deviation from the SM predictions are different for various cases considered.
25
Conclusions
We have performed a comparative study on quark and lepton flavor signals for representative SUSY models; mSUGRA, MSSM with right-handed neutrinos, SU(5) SUSY GUT with right-handed neutrinos, and U(2) models.
Each model predicts a different pattern of the deviations from the SM in b-s and b-d quark transition processes and muon and tau LFV processes.
These signals can provide important clues on physics at very high energy scales if SUSY particles are found at LHC.