Transcript The SuperB Detector Confronts New Physics

SuperB
The Super Flavor Factory
David Hitlin
DOE Annual Review of Caltech
June 29, 2009
David Hitlin
DOE Annual Review
June 29, 2009
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SuperB – the Super Flavor Factory
The Caltech group led the way in recognizing the importance of continuing
e+e- flavor studies substantially beyond the level of 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

There is clear discovery potential

Lepton flavor violation

New sources of CP violation

Rare b,c and t decays that will be crucial to interpreting New Physics
found at the LHC

Sensitivity to New Physics at scales accessible to the LHC requires a large
data sample:
50-75 ab-1 ⇒ luminosity of 1036 = 15 ab-1/year

SuperB, proposed for construction at or near the INFN Frascati laboratory,
can provide this luminosity with low power consumption and manageable
backgrounds, using a novel collider concept:

Very low emittance rings, similar to the ILC damping rings and a new
final focus scheme – the crabbed waist

The design includes a linearly polarized electron beam (LER), which
provides unique capabilities in studies of t production and decay

David Hitlin
DOE Annual Review
June 29, 2009
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Antonio Masiero at the June 2009 Perugia Workshop
David Hitlin
DOE Annual Review
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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
More specifically
 Is there charged lepton flavor 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 ?
 BABAR provides an excellent base for an upgraded detector that can
address these questions in the SuperB 1036 asymmetric e+e- environment
David Hitlin
DOE Annual Review
June 29, 2009
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B Physics: U(4S)
Charm mixing and CPV
Charm FCNC
Bs Physics: U(5S)
t Physics
David Hitlin
DOE Annual Review
June 29, 2009
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The SuperB machine design is evolving
John Seeman – miniMAC April 2009
David Hitlin
DOE Annual Review
June 29, 2009
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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
June 29, 2009
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E. Paoloni
Crabbed waist has been convincingly tested at DAFNE
David Hitlin
DOE Annual Review
June 29, 2009
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The March 2009 design has been reviewed by the
SuperB Machine Advisory Committee
Klaus Balewski (DESY), John Corlett (LBNL), Jonathan Dorfan (SLAC, Chair),
Stuart Henderson (ORNL), Tom Himel (SLAC), Claudio Pellegrini (UCLA),
Daniel Schulte (CERN), Ferdi Willeke (BNL), Andy Wolski (Liverpool, phone),
Frank Zimmermann (CERN)
Closeout report of the second miniMAC review - April 24, 2009
…. “Mini-MAC now feels secure in enthusiastically encouraging the
SuperB design team to proceed to the TDR phase, with confidence that
the design parameters are achievable”
The design takes as a constraint the re-use of PEP-II magnet and RF
components
Many details of the design, of course, remain to be worked out.
We aim for a TDR at the end of 2010, with an intermediate report by
the end of 2009
David Hitlin
DOE Annual Review
June 29, 2009
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David Hitlin
DOE Annual Review
June 29, 2009
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Prospects for SuperB
 The CERN Strategy Group has “taken note” that the SuperB
project is consistent with the European HEP roadmap
 INFN is working for a funding decision in 2009
 The Region of Lazio has committed funds for a tunnel and associated
structures, contingent upon Italian central government approval
 An excellent bid (15K€/m) for the tunnel + associated structures is in hand
 P5 recommended US participation in an overseas B Factory in
Scenario B or above
 INFN has requested PEP-II and
BABAR components from DOE
 The project has published a CDR
and a physics update
 Work is now underway on
comprehensive TDR volumes on
the accelerator, detector and
physics performance – end of 2010
 A Progress Report will be issued
by the end of 2009
David Hitlin
DOE Annual Review
320 signers
80 institutions
June 29, 2009
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SITES : Tor Vergata……..
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DOE Annual Review
June 29, 2009
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LNF option
David Hitlin
DOE Annual Review
June 29, 2009
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SuperB Experimental Hall & Transfer Line
+
David Hitlin
-
DOE Annual Review
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Caltech’s role in SuperB and the US (proto)collaboration
 We originated the concept of a 1036 e+e- collider in February, 2001
and ran a year-long workshop “The Discovery Potential of a Super B
Factory at 1036 Luminosity” in 2003
 Caltech has been instrumental in organizing the SuperB project and
is heavily involved in the TDR activities:
 David Hitlin is Deputy Director, a member of the Steering Committee, and
has been co-convener of the EMC group
 Frank Porter will become co-convener of the EMC group in the Fall




Ren-yuan Zhu is leading development of LYSO crystals for SuperB and SLHC
Chih-hsiang Cheng is the fast simulation EMC developer
Alexander Rakitin is optimizing the design of the backward calorimeter
We are playing an important role in preparations for a beam test of an LYSO
crystal array of anticipated for November 2009
 We will play a leading role in organizing a US detector/physics
collaboration when the project is approved by INFN and DOE agrees
to US participation
 Currently active: Caltech, Cincinnati, LBNL, Maryland, SLAC, ….
 We anticipate a US contingent of ~100 members
David Hitlin
DOE Annual Review
June 29, 2009
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Rear
endcap
Possible
barrel
extension
David Hitlin
Forward
endcap
DOE Annual Review
June 29, 2009
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Fast simulation of 2M BfKs events
C.-h. Cheng

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DOE Annual Review
June 29, 2009
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Btnt decay: stringent limits on New Physics
 Search for a lepton from
A. Rakitin
E
t decay + missing energy, recoiling
against reconstructed hadronic B decay
 Sensitivity depends on detector hermeticity
 BABAR coverage in backward direction is compromised by DIRC PID
 This can be substantially improved in SuperB by covering backward solid
angle with even a crude calorimeter
 Progress report:
 Signal
 Two background modes thus far:
David Hitlin
DOE Annual Review
June 29, 2009
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Btnt S/B with backward endcap
A. Rakitin
 S/B is significantly improved for both backgrounds
David Hitlin
DOE Annual Review
June 29, 2009
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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 SLHC upgrade
David Hitlin
DOE Annual Review
June 29, 2009
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A beam test of the forward EMC endcap configuration
in tagged photon and e- beams is planned for LNF in November
A 5x5 projective LYSO array will be used
with a CsI(Tl) surround to catch
the outer few percent of shower
We have borrowed 16 spare
CLEO-II CsI(Tl) crystals for
the outer section
David Hitlin
CMS APD readout module
2 @ 5mm x 5mm APD will be used
(10x10mm APDs are now available)
Photodiodes are also under
consideration
DOE Annual Review
June 29, 2009
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Is there a fourth quark generation ?
 A fourth generation CKM-like mixing matrix has
 2 additional quark masses
 3 additional mixing angles
 2 additional
CP-violating phases
 A recent analysis by Bobrowski, Lenz,
Reidl and Rohrwild shows that large
regions of the new parameter spaces
are still allowed
 SuperB will be the primary tool to close down, or, perhaps find, non-zero
values of these fourth generation parameters
q24
d14
q14
David Hitlin
DOE Annual Review
d13
June 29, 2009
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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
David Hitlin
DOE Annual Review
June 29, 2009
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Polarized t’s can probe the chiral structure of LFV
t¨
t¨
t -¬-¬
tt -¬¬-¬--
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
June 29, 2009
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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
June 29, 2009
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Conclusions
 High statistics flavor physics (50-75 ab-1) with SuperB will provide discovery
potential and information vital to interpret New Physics found at LHC
 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 will 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 will 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 can, as it did in PEP-II and
BABAR, play a central role in
SuperB and the construction of a US contingent of the Collaboration
 We are transitioning from the current intense analysis phase of
TDR phase of SuperB
David Hitlin
DOE Annual Review
June 29, 2009
BABAR into the
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David Hitlin
DOE Annual Review
June 29, 2009
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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
June 29, 2009
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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
June 29, 2009
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Beyond MFV
107 B (tmg)
SO(10) MSSM
LFV from CKM
LFV from PMNS
SuperB
now
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
June 29, 2009
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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
June 29, 2009
31
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
David Hitlin
DOE Annual Review
June 29, 2009
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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
June 29, 2009
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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
 flavor-violating coupling
d )
q
ij LR , RR , LL

( M ij2 )qLR , RR , LL
b
b~
s
~
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)
June 29, 2009
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Exhibit B: SM Branching fractions: Current  10ab-1  75ab-1
B   K n n
B  K *nn , ( K   KS   )
Actual limit
David Hitlin
DOE Annual Review
June 29, 2009
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CP Violation in charm
NOW
SuperB
David Hitlin
DOE Annual Review
June 29, 2009
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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
June 29, 2009
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