BNM Concluding Remarks

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BNM Concluding Remarks

• Tom Browder (University of Hawaii)

The Super B Factory and Todaiji
By 798 the vast compound of Todaiji and its
buildings were completed. According to Todaiji
records, 50,000 carpenters, 370,000 metal
workers, and 2.18 million laborers worked on its
construction and furnishings. The enormous
expenses virtually brought the nation to the
brink of bankruptcy.
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Deep Unsolved Problems in Particle Physics
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Where is the anti-matter ?

• Sakharov 1967 SM has the prerequisites for
  baryogenesis
• Baryon number violation at high temperatures
  (DBDL)
• Non-equilibrium (phase transitions)
• CP violation in the quark sector
• However, according to the theory department
• The KM (Kobayashi-Maskawa) phase in the SM is
  probably not sufficient (by about 10 orders of
  magnitude !)
• Refs V.A Rubakov, M.E. Shaposhnikov, Phys.Usp
  39,
• 461 (1996) A.G. Cohen, D.B. Kaplan, A.E. Nelson,
• Ann. Rev. Nucl. Part. Sci. 43, 27 (1993).

A New source of CP violation in quarks ?
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Fundamental Questions in Flavor Physics
Why three generations ? String Theory ? (e.g.
P.Binetruy et.al., hep-th/0509157 J.Phys G.32
129 (2006)) Larger Symmetry Groups
? Experiments with quarks or heavy leptons? This
question is probably too hard more tractable
questions..
Are there New Physics Phases and New sources of
CP Violation Beyond the SM ?
Experiments b?s CPV, compare CPV angles from
tree and loops
Are there new operators with quarks enhanced by
New Physics ?
Experiments AFB(B?Kl l), B?K ? rates and
asymmetries
Are there right-handed currents ?
Experiments b?s ? CPV, B-gtVP? or B?V V
triple-product asymmetries
Are there new flavor changing neutral currents ?
Experiments b?s ??bar, D-Dbar CPVmixingrare,
t???
These questions can only be answered at a Super B
Factory.
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Thanks, Tim Gershon
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New physics effects in B decayswill depend on
the type of NP
SUSY Models popular in Japan (e.g. SU(5) GUTs
connects ?s and quarks)
Generic predictions no signf. effects in B
decays, (due to Tevatron Bs mixing constraint)
however, enhanced lepton flavor violation such as
????
e.g. Okada
Generic SUSY
Not constrained well. But impossible to make ab
initio predictions, too much freedom and too many
extra phases and couplings.
Extra dimensions
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2006Intriguing Tension between Vub and sin(2f1)
tree
loop
Small non-zero NP phase
Amplitude close to 1
R. Itoh
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Off-diagonal SUSY terms with current data
x
L. Silvestrini
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CKM Unitarity Triangle (in)consistency
50 ab-1
Two scenarios at
Super B Factory
Something new in?
Precise measurements may show f3 (tree)
measurements are inconsistent with loops.
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Extra dimensions (by Randall Sundrum)
New Kaluza-Klein (K.K) particles are associated
with the extra dimension. (Tower of
states) Some may induce certain types of
flavor-changing neutral currents.
e.g. K.Agashe, G. Perez, A. Soni, PRD 71, 016002
(2005)
RS1
CPV in D decay
SM
Model K.K. Gluon near 3 TeV
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New Detectors for B Physics
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LHCb
J. Libby 10 fb-1 for LHCb 50 fb-1 for SuperB
The Super B Factory will face tough competition
from LHCb, which is now a real experiment.
There is considerable complementarity photon,
neutral detection and inclusive channels are
considerable easier at the Super B Factory while
time-dependent Bs studies are superior at LHCb.
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New Ideas and Unsolved Problems for the Detector
at the Super B Factory
Red meat for experimental physicists
Do we have robust solutions for vertexing and
particle ID ?
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SuperBelle default
Barrel
BWD EndCap
FWD EndCap
Realistic design based on discussion with QCS
group
VertexSi striplet (MAPS later) inner-most and Si
strip tracker TrackerDrift chamber rgt15cm PID
w/TOP and AC-RICH (endcap) ECALCsI (Tl) wave
from (barrel) pure CsIPMT (endcap) m
Scintillator SiPM
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Detector Layout
BASELINE
OPTION
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Detector summary (Haba)

• Now the two detectors look alike even more than
  before.
• 1cm Be beam pipe
• Striplet (MAP pixels later) 5 layer Si strips
• Drift chamber tracker for rgt15cm
• PID with a DIRC-like principle optional FWD PID
• EMcal with CsI(Tl) (barrel reuse) pure CsI (or
  LSO) for endcap
• Several important points to note
• Energy asymmetry/vertex resolution
• KLM?m detector
• APD for pure CsI endcap
• Role of backward EC for hermiticity
• Differences are worth investigating.

There is convergence on the detector
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Comments on Super B Factory Accelerator
Developments
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Simplified SuperB layout Crossing angle 225
mrad
November 2006
ILC ring ILC FF
Piredda
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Energy asymmetry discussion
There is no free lunch
INFN To reduce beam energy spread, improve beam
dynamics and reduce power costs, reduce the bg
factor from 0.56 to 0.23. To recover BaBar level
physics performance, must reduce the beampipe
radius to 1cm and improve vertexing performance
May improve acceptance for high multiplicity
modes and hermiticity
Similar discussions are underway for SuperKEKB in
order to reduce power and wiggler costs (T.
Tsuboyama, Ohnishi)
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Background from Touschek scattering ?

• Data taken 28-June-2003 12301300
• LER single beam
• Vertical beam size changed by size bump
• Beam lifetime expected to follow
• Background could depend on

Beam current
Vertical beam size sy
Beam life t
1/t
k might be different for different processes
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Super B Factory at KEK
Interaction Region Crab crossing q30mrad. by
3mm New QCS
New Beam pipe
More RF power
Damping ring
Linac upgrade
L 8?1035/cm2 /sec
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First step towards Super B Crab crossing
.
Superconducting crab cavities are now being
tested and will be installed at KEKB in 2007
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Piredda

ILC-style international review committee can
examine whether this is realistic
Question 12 nanometer beam spot in y, 2.7
microns in x. Is this possible in a real 2-3 km
circumference multi-orbit machine ?
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Master Plan for Japanese High Energy Physics
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Dai-repoton keikaku
K. Oide
Budget of Japanese accelerator physicists
Official Announcement from KEK director A. Suzuki
on Super B expected in 2007
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Thinking outside of the ? (hako)
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E. Baracchini
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E. Baracchini
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Bs??? at Upsilon(5S)
E. Baracchini
Another example where the Super B is the only
machine where this experiment is possible.
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Searches for light (GeV) Dark Matter
No sensitivity of direct searches to Mlt10 GeV

• B decays with missing energy
• e.g. B?K nothing
• (use fully reconstructed tags)
• Upsilon(1S)?nothing
• (use Upsilon(3S)-gtUpsilon(1S) ?? and run KEKB
  at the Upsilon(3S) resonance, modify trigger)
• (new Belle UL)

T. Iijima
Expected BFO(6 x 10-3)
O. Tajima
Also may use Upsilon(nS) to look for a very
light CP odd neutral Higgs a1 (J. Gunion)
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Results of Belle Dark Matter Search
Nsignal 38 39, consistent with zero
BF(Y(1S)?invisible) lt 2.5x10-3 (90C.L.)
McElrath prediction is disfavored.
SM Y(1S)?nnbar
O. Tajima
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Doing light dark matter g Uinvisible
5 GeV, g
Due to Beam-BG suppressed Bhabha veto Veto with
Esum of two-f rings Two-threshold logic is
still under testing
No signal
O. Tajima
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Use time-dependent flavor asymmetry in B?D l ?
to look for deviations from quantum mechanics
(Belle)
Something for the next SuperB meeting ?
Chi2 5
Chi2 43
Chi2 174
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Wise words from a discoverer of CP violation
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Backup Slides
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Crab waist (P. Raimondi)
Crab waist removes beam-beam betratron
coupling Introduced by the crossing angle

• Vertical waist has to be a function of x
• Z0 for particles at sx (- sx/2q at low
  current)
• Z sx/q for particles at sx (sx/2q at low
  current)
• Crabbed waist realized with a sextupole in
  phase with the IP in X and at p/2 in Y

May be studied at KEKB and DAFNE in machine
experiments
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Possible site Tor Vergata campusRing
circumference 3.-2.2 km
Piredda
Civil construction synergy with FEL project or
subway ???
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Piredda
Sigx mm 2.67
Etax mm 0.0
Sigy nm 12.6
Betx mm 9.0
Bety mm 0.080
Sigz_IP mm 6.0
Sige_IP 1.3e-3
Sige_Lum 0.9e-3
Emix nm 0.8
Emiy nm 0.002
Emiz mm 8.0
Cross_angle mrad 225
Sigz_DR mm 6.0
Sige_DR 1.3e-3
Np 10e10 2.3
Nbunches 6000
DR_length km 3.0
Damping_time msec 20
Nturns_betwe_coll 1
Collision freq MHz 600
Lsingleturn 1e36 1.2
Lmultiturn 1e36 1.0

• An ILC-like parameter list
• Same DR emittances
• Same DR bunch length
• Same DR bunch charges
• Same DR damping time
• Same ILC-IP betas
• Crossing Angle and Crab Waist to minimize BB
  blowup