Transcript The SuperB Detector Confronts New Physics

SuperB
The Super Flavor Factory
David Hitlin
DOE Annual Review of Caltech
July 10, 2008
David Hitlin
DOE Annual Review
July 10, 2008
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SuperB – the Super Flavor Factory
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The Caltech group led the way in recognizing the importance of continuing
flavor studies in e+e- substantially beyond the level achievable at BABAR and
Belle
The crucial role that flavor physics will play in understanding New Physics
found at the LHC is becoming ever more clear to the community
Sensitivity to New Physics at scales accessible to the LHC requires 50-75
ab-1 ⇒ luminosity of 1036
Achieving this luminosity with reasonable power consumption and currents low
enough to make the detector background problem tractable is not an easy
problem
With SLAC and then Frascati colleagues, several approaches were tried
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Scale up PEP-II in the existing tunnel– more bunches, more current
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Revisit old idea of colliding linacs with high disruption- not attractive
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Use very low emittance rings, like the ILC damping rings, but collide at
an angle with a new final focus scheme – the crabbed waist
Several workshops have been held to investigate the physics capabilities
of a Super Flavor Factory
Efforts are now centered on SuperB, an international project hosted by
INFN in Italy
David Hitlin
DOE Annual Review
July 10, 2008
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Primary physics objectives of a Super Flavor Factory
 Perform measurements in the flavor sector such that:
 If new particles are discovered at LHC we are able to study the
flavor structure of the New Physics
 If the New Physics scale is beyond the reach of the LHC,
explore the New Physics scale
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More specifically
Is there charged lepton flavour violation (LFV) ?
Are there new CP-violating phases in b,c or t decay ?
Are there new right-handed currents ?
Are there new loop contributions to flavor-changing neutral currents
Are there new Higgs fields ?
Is there new flavor symmetry that elucidates the CKM hierarchy ?
We must also understand the requirements for a detector that can
address these questions in a 1036 asymmetric e+e- environment ?
David Hitlin
DOE Annual Review
July 10, 2008
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Prospects for a Super Flavor Factory
 The recent P5 report recommends, in Scenario B and above,
US participation in an overseas Super B factory
 There are two proposals on the market
 SuperKEKB, an upgrade of KEKB, with an initial luminosity of 1-2 x 1035
and an upgrade path to 4-8 x 1035 by 2027, using 83 MW
 SuperB, a new low emittance collider, with an initial luminosity of 1036
using 17 MW, and an upgrade path to 4 x 1036, to be built at
Rome II University “Tor Vergata”, using many PEP-II components
 This talk will concern SuperB
INFN has now made a
formal request to SLAC for
PEP-II and BABAR Components
320 signers
80 institutions
David Hitlin
DOE Annual Review
July 10, 2008
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SuperB One Pager
 SuperB is a Super Flavor Factory with very high initial luminosity,
1036, which can be upgraded to 4x1036 in a straightforward manner
 It is asymmetric : 4 on 7 GeV
 Most of the ring magnets can be reused from PEP-II, as can the RF systems,
many vacuum components, linac and injection components – as well as BABAR as the
basis for an upgraded detector – the net in-kind value is $270M
 The high energy beam can be linearly polarized to ~85% , using the SLC laser gun
 This is particularly important for confronting New Physics in t decays
 The primary ECM will be the U(4S), but SuperB can run elsewhere in the U region,
and in the charm &tau threshold regions as well, with a luminosity above 1035
 One month at the (3770), for example, yields 10x the total data sample that
will be produced by BEPCII
 SuperB will be built on the campus of the Rome II University at Tor Vergata
 There is an FEL already in early stages of construction on the site
 Tunneling will continue to dig the SuperB tunnel, funded by Regione Lazio
 Time scales
 (Successful) conclusion of the European Roadmap process (INFN, ECFA,
CERN Strategy Group) by the end of 2008, followed by INFNMinistry
 TDR effort is beginning: construction 5 years : luminosity in 2015-16
David Hitlin
DOE Annual Review
July 10, 2008
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INFN International Review Committee Report
Members: H. Aihara, J.B. Dainton (chair), R. Heuer (to Nov 07), Y. K. Kim,
J. Lefrançois, A. Masiero, S. Myers (for April 08),
T. Nakada (RECFA from April 08), D. Schulte, A. Seiden
Conclusions
● Strongly recommend continuation of work for 1036 cm-2 s-1
asymmetric e+e- collider
● Even more concerted effort to fully evaluate
physics potential ↔ machine specifications
● Major design program to establish credibility
of machine now critical ← showstoppers ?
● Machine Advisory Committee (MAC) now essential
● Preservation of detector and PEP2 components
● Increasing global involvement if timescale for a TDR is to be met
David Hitlin
DOE Annual Review
July 10, 2008
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David Hitlin
DOE Annual Review
July 10, 2008
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SuperB Experimental Hall & Transfer Line
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DOE Annual Review
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SuperB arameters
SuperKEKB
8
3.5
0.8 (0.4)
Beam-beam
transparency
conditions in
red
IP beam distributions
for KEKB
5000
12
|
5
9.4 |
4.1
3
200
45
9 (24)
0.367
42
3
30
IP beam distributions
for SuperB
(without transparency
conditions)
0.405
0.209
83
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DOE Annual Review
July 10, 2008
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Crabbed waist beam distribution at the IP
Crab sextupoles
OFF
waist is orthogonal
to the axis of bunch
Crab sextupoles
ON
waist moves to the
axis of other beam
All particles from both beams collide in the minimum by region,
with a net luminosity gain
David Hitlin
DOE Annual Review
July 10, 2008
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E. Paoloni
B Physics: U(4S)
Charm mixing and CPV
Charm FCNC
Bs Physics: U(5S)
t Physics
David Hitlin
DOE Annual Review
July 10, 2008
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A Super Flavor Factory is also a t factory
Lepton Flavor Violation
polarized e- beam: reduced background
Very important order of magnitude
10-8  10-9
Complimentarity with m  e g
David Hitlin
DOE Annual Review
July 10, 2008
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LFV in t decays: SuperB capability
SuperB sensitivity directly confronts many New Physics models
BABAR
SuperB
sensitivity
For 75 ab-1
We expect to see LFV events, not just improve limits
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DOE Annual Review
July 10, 2008
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Why do we need a very large sample ~75ab-1 ?
Example: CPV in loop B decays
Determination of coupling [in this case : (d13)LL]
(d13)LL
SM
Im
Im
(d13)LL
with 10 ab-1 and 75 ab-1
Re (d13)LL
David Hitlin
DOE Annual Review
SM
Re (d13)LL
July 10, 2008
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Caltech’s role in SuperB and US the collaboration
 We are clearly to engine behind US SuperB activities
 Member of Steering Committee
 Leading and actively working in the R&D group on EMC upgrade for the
revised BABAR detector
 Contributing to development of Monte Carlo and reconstruction software to
optimize the EMC in particular, and the overall detector
 Working towards formation of a US contingent of the SuperB Collaboration
 Expect 100-150 US collaborators
 A meeting to inform potential US participants is scheduled for July 25
 The proto-Collaboration has already produced an impressive CDR
 The group is now entering the TDR phase
 For the US to be well-positioned as TDR responsibilities are worked out
over the next year or so, some actual resources will soon be needed
 INFN is beginning to provide R&D funding for Italian groups
 On the appropriate time scale and in the appropriate way, the US
groups need support of this kind
David Hitlin
DOE Annual Review
July 10, 2008
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Ren-yuan Zhu, with ADR funds, has been for several years, working
on the development of LYSO crystals for HEP
Very attractive for the SuperB endcap EMC and the CMS upgrade
David Hitlin
DOE Annual Review
July 10, 2008
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5x5 Projective LYSO array with CsI(Tl) surround
A 7x7 array is best, but it can be
approximated by a 5x5 array
surrounded by CsI(Tl) to catch
the outer few percent of shower
16 spare BABAR CsI(Tl)
crystals may be available
David Hitlin
CMS APD readout module
2 @ 5mmx5mm APD
(10x10mm APDs are now available)
DOE Annual Review
July 10, 2008
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Conclusions
 High statistics flavor physics (50-75 ab-1) at an e+e- collider will likely provide
information crucial to the understanding of new physics found at LHC
 SuperB, with an initial luminosity of 1036 cm-2s-1 can provide such a sample in
the canonical five years
 The achievable levels of sensitivity in rare b, c and t decays allow substantial
coverage in the parameter space of new physics
 SuperB presents a strong physics opportunity for the US community
 US participation in SuperB would leverage $270M of PEP-II and
BABAR
components through an in-kind contribution
 New funding of $10-20M/year over the TDR and construction period would also
be needed to allow US participation in design and construction of the collider
and detector upgrade
 Such participation in encouraged by P5 in Scenario B and above
 We are working towards a turn-on date of 2015/16
 The Caltech group will, as it did in PEP-II and
BABAR, play a central role in
SuperB, should it go forward
 We propose to begin by transitioning from the current intense analysis phase of
BABAR into the TDR phase of SuperB
David Hitlin
DOE Annual Review
July 10, 2008
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David Hitlin
DOE Annual Review
July 10, 2008
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David Hitlin
DOE Annual Review
July 10, 2008
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David Hitlin
DOE Annual Review
July 10, 2008
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David Hitlin
DOE Annual Review
July 10, 2008
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From the SuperKEKB web page
David Hitlin
DOE Annual Review
July 10, 2008
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Q&A
 Is there a motivation to continue e+e- flavor physics studies with a Super
B
factory beyond the BABAR/Belle/(LHCb) era ?
 Yes – provided that new measurements have sensitivity to New Physics in
b, c and t decay
 What size data sample is required to provide this sensitivity ?
 50-75 ab-1 (BABAR+Belle total sample is <2 ab-1)
 What luminosity is required to gather a sample of this size in five years ?
 At least 1036 cm-2s-1
 Can an asymmetric collider with this luminosity be built ?
 Yes, using an innovative new approach: a low emittance collider, based on
concepts developed for the ILC damping rings, and employing a new type
of final focus – a “crabbed waist”. The machine is called SuperB
 Can a detector be built that can withstand the machine backgrounds ?
 Yes. The beam currents are less than those at PEP-II and KEKB
 In this era of increasing energy prices, can you pay the power bill ?
 Yes. The wallplug power, 17MW, is less than half that of KEKB (40mw)
David Hitlin
DOE Annual Review
July 10, 2008
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Interplay between metrology and New Physics sensitivity
SuperB+Lattice improvements
Today
r = 0.163 ± 0.028
h = 0.344± 0.016
r = ± 0.0028
h = ± 0.0024
Improving the precision of Unitarity Triangle measurements,
along with reducing theoretical uncertainties, can provide evidence
for New Physics
David Hitlin
DOE Annual Review
July 10, 2008
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LFV
5s disc
B
B
2
75
10ab : 75ab 
for B(t  mg ), 7.5 for B(t 
10
1
1
CMSSM : meg vanishes at all SPS points
David Hitlin
)
MVF-NP extensions : meg vanishes as s130
tmg is independent of s13
DOE Annual Review
July 10, 2008
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Beyond MFV
107 B (tmg)
SO(10) MSSM
LFV from CKM
LFV from PMNS
now
SuperB
SuperB
M1/2
SUSY GUT
now
SuperB
Allowed by Dms
From Bs phase
David Hitlin
Recent work :
J.K.Parry, H.-H. Zhang
hep-ph/0710.5443
DOE Annual Review
July 10, 2008
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Polarized t’s can probe the chiral structure of LFV
t¬
t¬
tt -¬¬-¬--
t -¬¬
t
tt -¬¬
¬
Flipping the helicity of the polarized
electron beam allows us to
determine the chiral structure
of dimension 6 four fermion
lepton flavor-violating interactions
-t
t
t ¬¬
¬
Dassinger, Feldmann, Mannel, and Turczyk
JHEP 0710:039,2007;
[See also Matsuzaki and Sanda
arXiv:0711.0792 [hep-ph]
David Hitlin
DOE Annual Review
July 10, 2008
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Minimal Flavor Violation : SNOWMASS points
SPS4 is ruled out by exp
value of B(Bsg)
SPS1a is the least favorable
for flavor effects, but
SuperB and only SuperB
can observe 2s deviations in
several observables
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DOE Annual Review
July 10, 2008
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New Physics in CPV:
Wb
Many channels can show effects in the range DS~(0.01-0.04)
s
s
s
d
t
B0d
sin2b from “s Penguins”…
d
f
SuperB
K0
~
g
b
b~
~
s
X
s
d
d
 23 )LR
(*) theory limited
David Hitlin
DOE Annual Review
July 10, 2008
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MSSM + generic soft SUSY breaking terms
New Physics contribution
(2-3 transitions)
~
g
Flavor-changing NP effects in the squark propagator
 NP scale SUSY mass m ~ mg
d )
 flavor-violating coupling
q
ij LR , RR , LL

( M ij2 )qLR , RR , LL
b
b~
~
s
X
d )
m2
d
23 LR
| d 231| LR
| d 23 | LR = (0.026 ± 0.005)
d is measured with a
significance >3s away
from zero
0.1
10-1
Arg(d23)LR=(44.5± 2.6)o
0.01
10
2
11
David Hitlin
DOE Annual Review
10 10 mgluino (TeV)
July 10, 2008
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s
Exhibit B: SM Branching fractions: Current  10ab-1  75ab-1
B   K  
B  K * , ( K   KS   )
Actual limit
David Hitlin
DOE Annual Review
July 10, 2008
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CP Violation in charm
NOW
SuperB
David Hitlin
DOE Annual Review
July 10, 2008
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