iv. low energy probes of susy j erler (unam) a kurylov (caltech) c lee (caltech) s su (arizona) p...
TRANSCRIPT
IV. Low Energy Probes of SUSY
• J Erler (UNAM)
• A Kurylov (Caltech)
• C Lee (Caltech)
• S Su (Arizona)
• P Vogel (Caltech)
• G Prezeau (Caltech)
• V Cirigliano (Caltech)
• How is SUSY broken?
• How viable is SUSY dark matter ?
• Is there enough SUSY CP violation to account for the matter-antimatter asymmetry?
MSUSY MSM
High precision, low energy measurements can probe new physics in the “desert”
Complementary to Z0 pole
Precision ~ Mass Scale
SUSY OSUSY
OSM
M˜ M
2 M=m~ 2 x 10-9
exp ~ 1 x 10-9
M=MW ~ 10-3
• LEP & SLD programs are complete
• Sensitivity to off Z0 - resonance physics
• Precision is improving
Weak decays
d u e es u e eb u e e
u c t Vud Vus Vub
Vcd Vcs Vcb
Vtd Vts Vtb
d
s
b
Vud
2 Vus
2 Vub
2= 1
0.9968 0.0014
SM
Expt
0.9487 0.0010
0.0482 0.0008
0.000010.000007
Weak decays
u c t Vud Vus Vub
Vcd Vcs Vcb
Vtd Vts Vtb
d
s
b
n p e eA(Z,N) A(Z 1,N 1) e e
0 e e
-decay
d u e es u e eb u e e
GF
GF Vud 1 r r
New physics
˜ 0
˜
˜
e
W
e
e
e
˜ 0
˜
˜
˜ e
SUSY
OSUSY
OSM~ 0.001
Weak decays
n p e eA(Z,N) A(Z 1,N 1) e e
0 e e
-decay
GF
GF Vud 1 r r
SM theory input
W
e p
e n
MW GF
2
ˆ 2
lnMZ
2
2
CW ()
Weak decays
n p e eA(Z,N) A(Z 1,N 1) e e
0 e e
-decay
GF
GF Vud 1 r r
Ft ft 1 R NS 1 C K 2(GF
)2
0+ ! 0+ “Superallowed”
Nuclear structure-dependent corrections
Weak decays
n p e eA(Z,N) A(Z 1,N 1) e e
0 e e
-decay
GF
GF Vud 1 r r
Ft ft 1 R NS 1 C K 2(GF
)2
0+ ! 0+ “Superallowed”
Nuclear structure-dependent corrections
New tests
Weak decays
n p e eA(Z,N) A(Z 1,N 1) e e
0 e e
-decay
GF
GF Vud 1 r r
Liquid N2
Be reflector
Solid D2
77 K poly
Tungsten Target
58Ni coated stainless guide
UCN Detector
Flapper valve
LHe
dW 1 ap e
p
E e E
An
p eEe
Ultra cold neutrons
LANSCE: “UCN A”
Future SNS: Pulsed Cold Neutrons: “abBA”
Weak decays
n p e eA(Z,N) A(Z 1,N 1) e e
0 e e
-decay
GF
GF Vud 1 r r
Decay correlationsFuture SNS: Pulsed Cold Neutrons: “abBA” G. Greene
Weak decays
n p e eA(Z,N) A(Z 1,N 1) e e
0 e e
-decay
GF
GF Vud 1 r r
LANSCE
SNS
NIST
Weak decays
GF
GF Vud 1 r r
Vud
gv/gA
n p e eA(Z,N) A(Z 1,N 1) e e
0 e e
-decay
n ~ gv2+3gA
2
ILL, Grenoble
Weak decays
n p e eA(Z,N) A(Z 1,N 1) e e
0 e e
-decay
GF
GF Vud 1 r r
0e e ~ 110 8
PSI: “Pi-Beta”
Weak decays
u c t Vud Vus Vub
Vcd Vcs Vcb
Vtd Vts Vtb
d
s
b
K 0 e e
kaon decay
GFK
GF Vus 1 rK r
SUSY Loops: Too small
d u e es u e eb u e e
Value of Vus important
Weak decays
u c t Vud Vus Vub
Vcd Vcs Vcb
Vtd Vts Vtb
d
s
b
d u e es u e eb u e e
K 0 e e
kaon decay
SM Theory
Weak decays
K 0 e e
kaon decay
Vus fK 0
(0)
GFK
GF Vus 1 rK r
Vus
V. Cirigliano
SUSY Radiative Corrections
e
e
W
W
˜ e
˜ e
˜ 0
˜
˜
e
W
e
e
˜
W
˜
˜ 0
e
Propagator
Box
Vertex & External leg
e
e
˜ 0
˜
˜
˜ e
r
e
e
W
W
˜
˜ 0
Other Inputs
1. Muon (g-2):
2. W Mass:
3. Superpartner Masses:
Size of error bar crucial
Start analysis with collider lower bounds and vary later
GF
MZ2
2MW2 MZ
2 MW2 1 r
0.0091 rSUSY 0.0037
mt , MH
Muon g-2
SM Theory
J. Miller
Muon g-2
SUSY
Muon g-2SUSY
Muon g-2
W Boson & Top Quark Masses
GF
MZ2
2MW2 MZ
2 MW2 1 r
Most precisely measured
Dominant uncertainties
mt
0.0091 rSUSY 0.0037
MW=80.425 +/- 0.034Mt=178.0 +/- 2.7 +/- 3.3
MZ=91.1875 +/- 0.0021
Visible World
Hidden World
Flavor-blind mediation
SUSY Breaking
SUSY theory must explain why no SUSY particles yet seen
M ˜ q M ˜
M ˜ e me
M ˜ q mq
M ˜ MW ,Z ,
105 parameters~ 5 parameters
Visible World
Hidden World
Flavor-blind mediation
SUSY Breaking
SUSY Theory
M ˜ q M ˜
Flavor-blind SUSY-breaking
Exp’t
M ̃L M ̃q L
Experiment
Kurylov & R-M
clashes with
CC (non) universality & the MSSM
Data appear to conflict with MSSM & models having flavor-blind SUSY-breaking mediation
Possible resolutions:
1. MSUSY > TeV
2. Hadronic effects in SM predictions
3. Something is wrong with exp’t
4. New models of SUSY-breaking
5. Go beyond the MSSM
SUSY irrelevant to low energy observables
Better control of non-pQCD
Exp’t: n decay, Ke3 decay
???
Break R-parity
New ideas needed !
But NuTeV
LANSCE, NIST, SNS…
Kaon Decays & Vus
KLOE Prelim
Unitarity
Vus
Cirigliano & De Lucia
Kaon Decays & Vus
KLOE Prelim
Unitarity
Vus
CC (non) universality & the MSSM
Data appear to conflict with MSSM & models having flavor-blind SUSY-breaking mediation
Possible resolutions:
1. MSUSY > TeV
2. Hadronic effects in SM predictions
3. Something is wrong with exp’t
4. New models of SUSY-breaking
5. Go beyond the MSSM
SUSY irrelevant to low energy observables
Better control of non-pQCD
Exp’t: n decay, Ke3 decay
???
Break R-parity But NuTeV
Visible World
Hidden World
Flavor-blind mediation
SUSY Breaking
SUSY Theory OK if no SUSY dark matter
0 e e
e e
˜ e Rk
12k 12k
Test in scattering experiments
“R parity violation” (RPV)
Weak decaysMW
l2
APV
R-Parity Violation (RPV)
WRPV = ijk LiLjEk + ijk LiQjDk +/
i LiHu
+ ijkUiDjDk
L=1
B=1
Li, Qi
Ei, Ui, Di
SU(2)L doublets
SU(2)L singlets
proton decay: Set
ijk =0
Four-fermion Operators
e e
˜ e Rk
12k 12k
e
d e
d
˜ q Lj
1j1
1j1
L=1 L=1
12k 12k
2
4 2GF M ̃e Rk
21j 1
/ iji
/ 2
4 2GFM ̃q Lj
2