The
Super Flavour Factory
Physics Case
Achille Stocchi
SuperB Meeting
La Biodola, Isola d'Elba
May 31st-June 3rd,
2008
Exploration of two frontiers
“Relativistic path”
Crucial : Center-of-mass energy
“Quantum path”
Crucial : Luminosity
The problem of particle physics today is :
where is the NP scale L ~ 0.5, 1…1016 TeV
The quantum stabilization of the Electroweak Scale
suggest that
L ~ 1 TeV
LHC will search on this range
What happens if the NP scale is at 2-3..10 TeV
…naturalness is not at loss yet…
Flavour Physics explore also this range
We want to perform flavour measurements such that :
- if NP particles are discovered at LHC we able
study the flavour structure of the NP
- we can explore NP scale beyond the LHC reach
1034
luminosity to have measurable effects (anyhow) if NP particles are at EW
1036 luminosity to have measurable effects (anyhow)
if NP particles are at TeV
 bq
L eff
scale
scale
Special specific meeting
to answer the IRC questions on physics
and sharpen the physics case
3 Chapters : Physics Case
Detector
Machine
444 pages
320 signers
~80 institutions
49 signers
~24 institutions
Super Flavour Factory
> 1036cm-2 sec-1  >15ab-1 per year
(today max ~1034cm-2 sec-1)
after several years running Babar~450fb-1 Belle~700fb-1 )
Background machine ~ to the present one
Possibility running
- at lower energies (t-charm)
- ..intermediate energies..
- at higher energies (Bs)
- with polarized beam
B factories have shown that a variety of measurements
can be performed in the clean environment.
By doing the work of extrapolating the existing measurements and the
ones which will be possible with more statistics we observe that :
- Several measurements are statistically limited and so it is
worthwhile to collect >75ab-1
-The systematic errors are very rarely irreducible and can
almost on all cases be controlled with control samples.
In the CDR
- we justify the precision of a variety of measurements
- we discuss the phenomenological impacts of these measurements
(Physics Case chapter ~100 pages)
In the Valencia proceedings
- we sharpen the Physics Case addressing the questions asked by
the IRC
50 pages)
B Physics @ U(4S)
Charm mixing and CP
Charm FCNC
t Physics
Bs Physics @ U(5S)
No single golden modes.
Many observable sensitive to New Physics
We do not know the NP we will deal with…
so we need to have many observable
Golden modes or not golden modes..
Illustrative with few selected GOLDEN MODES
X The GOLDEN channel for the given scenario
O Not the GOLDEN channel for the given NP scenario
but can show experimentally measurable deviations
from SM.
Interplay between metrology and NP sensitivity
Today
SuperB+Lattice improvements
r = 0.163 ± 0.028
h = 0.344± 0.016
Improving CKM is
crucial to look for NP
r = ± 0.0028
h = ± 0.0024
NP in a Model Independent way in F=2 transitions
Cq e
Now
SuperB~200GeV
SensitivitySuperB
(MFV)
in case of
discrepency
Sensitivity
(MFV)
~1TeV
Improving CKM is
crucial to look for NP
2id
SM
QNP

Q
 B 2 SM B 2
QB 2
MFV : SNOWMASS points
SPS4 ruled out by present
values of Bsg.
SPS1a is the least favorable for
flavour, but SuperB and only SuperB
can observe 2 s deviations in several
observables
Higgs-mediated NP in MFV at large tanb
2ab-1
10ab-1
2ab-1
MH~0.4-0.8 TeV
for tanb~30-60
tan b
SuperB -75ab-1
tan b
How signal would like
with MH=350GeV
75ab-1
MH~1.2-2.5 TeV
for tanb~30-60
tan b
Importance of having very large sample >75ab-1
tan b
MSSM+generic soft SUSY breaking terms
Flavour-changing NP effects in the squark propagator
 NP scale SUSY mass
 flavour-violating coupling
b
|  23 |LR
~
~
s
b
d
 23 LR
In the red regions the 
are measured with a
significance >3s away
from zero
1
|  23 |LR = (0.026 ± 0.005)
New Physics contribution
(2-3 families)
~
g
10-1
Arg(23)LR=(44.5± 2.6)o
10-2
1
1 TeV
10 mgluino (TeV)
s
Determination of coupling [in this case : (13)LL]
Im (13)LL
Im (13)LL
with 10 ab-1 and 75 ab-1
SM
SM
Re (13)LL
Re (13)LL
Importance of having very large sample >75ab-1
Some comparison: Current 10ab-1 75ab-1
B   K  
Actual limit
B   K *   ,( K   K S   )
SFF is also a t factory  golden measurement LFV
Further improvements if polarized beams.
Very important order of magnitude
10-8  10-9
Complementarity with m  e g
LFV
5s disc
2
CMSSM : meg vanish at all SPS points
MVF-NP extentions : meg alos vanish s130
tmg is independent.
Going beyond MFV
107 BR (tmg
SO(10) MSSM
LFV from CKM
LFV from PMNS
SuperB
M1/2
SUSY GUT
now
SuperB
Allowed by ms
From Bs phase
Recent work :
J.K.Parry, H.-H. Zhang
hep-ph/0710.5443
Charm Physics
Charm physics using the charm produced at U(4S)
Consider that running 4 month at threshold
-1
Charm physics at threshold 0.3 ab
we will collect 1000 times the stat. of CLEO-C
~ 10 times of futire BESIII
Strong dynamics and CKM measurements
D decay form factor and decay constant @ 1%
Dalitz structure useful for g measurement
@threshold(4GeV)
Rare decays
FCNC down to 10-8
@threshold(4GeV)
x~1%,
exclusive Vub ~ few %
syst. error on g from Dalitz Model <1o
D mixing
Better studied using
the high statistics
collected at U(4S)
CP Violation in mixing could now addressed
CP Violation in charm
NOW
SuperB
X(4160) D*D*
TWO STATES? X(3872) & X(3876) ?
Predicted by tetraquark
e+ e-  J/y D(*)D(*)
J/y D+
D*
D*D*
D
J/y D*+
D*
D
The first charged state: Z(4430)!
Y(4260)J/y
The observation matrix
J/y-
D(*)D(*)
J/yw
J/y0
y(2S)
J/yK,
Y2S
J/yf,h
J/yg
X(3872)
Seen
Seen
Not seen
Not seen
Not seen
No search
N/A
Not seen
Seen
Y(3940)
No search
X(3940)?
Seen
No search
Not seen
No search
No search
No Fit
No fit
Y(4260)
Seen
No fit
No fit
No search
No search
No search
Not seen
No fit
N/A
Y(4350)
Not seen
No fit
No fit
No search
No search
No search
Seen
No fit
N/A
Z(4430)
No search
No search
No fit
No search
Seen
No search
No search
No Fit
No
search
Y(4660)
Not seen
No fit
No fit
No search
No search
No search
Seen
No Fit
N/A
Indications that strong interactions do not only form mesons and baryons,
but also
other forms of aggregation
SuperFlavourFactory is needed to
 Convert these indications into a solid set of measurements
 Discriminate among possible interpretations (regular mesons, molecules, tetraquarks,
hybrids,…)
 Complete the picture (Very large number of missing states)
SuperFlavourFactory is ideal because
 Very high Luminosity
 Adjustable energy (importance of scan)
Summary
SFF can perform many measurements at <1% level of precision
Precision on CKM parameters will be improved by more than a factor 10
NP will be studied (measuring the couplings) if discovered at LHC
if NP is not seen at the TeV by LHC, SFF is the way of exploring
NP scales of the several TeV (in some scenario several (>10 )TeV..)
with measurement on B, charm and t sectors
1034
luminosity to have measurable effects (anyhow-MFV) if NP particles are at EW
1036 luminosity to have measurable effects (anyhow-MFV)
if NP particles are at TeV
scale
scale
… and do not forget… SFF is also a Super-Super t-charm factory…
…and do not forget…SFF is a unique laboratory for spectroscopy
BACKUP
MATERIAL
107 BR (tmg
SO(10) MSSM
LFV from CKM
LFV from PMNS
SuperB
Very important order of magnitude
10-8  10-9
Complementarity with m  e g
MEG sensitivity meg ~10-13
M1/2
LFV
5s disc
2
LFV from CKM
Letpon MFV
GUT models
LFV from PMNS
Another example of sensitivity to NP : sin2b from “s Penguins”…
Many channels can be measured with S~(0.01-0.04)
-
W
b
t
B0d
d
s
s
s
d
f
SuperB
K0
~
g
b
~
~
s
b
 d 23 LR
 
s
(*) theoretical limited
more..
tan b
tan b
B  t  and B  m  combination
exclusion plots in [ M(H+), tan b]
tan b
tan b
No single golden modes.
Many observable sensitive to New Physics
Tau g-2
Start with the expt. with m
1-2.4
Make use of all the informations (total x-section,angular distribution, f-b asymmetry.
Measure Re and Im parts
CHARM Mixing from Dalitz analysis
Results from
Belle
Spectroscopy
Run at the U(5S)
Possible with the same luminosity
Bd(B+) and Bs are produced and can be separated
BsBs
Dominated
contribution
~95%
Bs*Bs
Bs*Bs*
BdBd
Bd*Bd
Bd*Bd*
*
Bd,B+ produced
with factor 6 less
than at U(4S)
*
Integrated quantities ASL and ACH at less than 0.5%
Even a run at 1ab-1 will give less 1% error.
For more details see E. Baracchini et al. hep-ph/0703258
BB from B*B produced in C=+1 after
BBg decay  some sensitivity to
S term in time integrated CP asym.