David Hitlin DOE Annual Review July 10, 2008 1 Super B The Super Flavor Factory David Hitlin DOE Annual Review of Caltech July 10, 2008.

David Hitlin DOE Annual Review July 10, 2008 1

SuperB The Super Flavor

Factory

David HitlinDOE Annual Review of Caltech

July 10, 2008


SuperB – the Super Flavor Factory

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 Scale up PEP-II in the existing tunnel– more bunches, more current Revisit old idea of colliding linacs with high disruption- not attractive 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


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 flavour violation (LFV) ? Are there new CP-violating phases in b,c or 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 ?


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 atRome II University “Tor Vergata”, using many PEP-II components

This talk will concern SuperB

320 signers80 institutions

INFN has now made aformal request to SLAC for

PEP-II and BABAR Components


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 decays

The primary ECM will be the (4S), but SuperB can run elsewhere in the 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 INFNMinistry TDR effort is beginning: construction 5 years : luminosity in 2015-16


INFN International Review Committee ReportMembers: 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



SuperB Experimental Hall & Transfer Line

-+


SuperB arameters

Beam-beamtransparencyconditions inred

SuperKEKB

3.5 80.8 (0.4)

5000 12 | 5

9.4 | 4.1 3 200

9 (24) 0.36742

330

83

0.2090.405

45

IP beam distributions

for KEKB

IP beam distributions for

SuperB(without

transparency conditions)


Crabbed waist beam distribution at the IP

Crab sextupoles

OFF

Crab sextupoles

ON

waist is orthogonal to the axis of bunch

waist moves to the axis of other beam

All particles from both beams collide in the minimum y region, with a net luminosity gain

E. Paoloni


Charm FCNC

Charm mixing and CPVB Physics: (4S)

PhysicsBs Physics: (5S)


polarized e- beam: reduced background

Very important order of magnitude 10-8 10-9

Complimentarity with e

A Super Flavor Factory is also a factory Lepton Flavor Violation


LFV in decays: SuperB capability

SuperB sensitivity directly confronts many New Physics models BABAR

SuperBsensitivityFor 75 ab-1

We expect to see LFV events, not just improve limits


Why do we need a very large sample ~75ab-1 ?

Im (

13) L

L

Im (

13) L

L

Re (13)LL Re (13)LL

SM SM

Example: CPV in loop B decays

Determination of coupling [in this case : (13)LL] with 10 ab-1 and 75 ab-1


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


Ren-yuan Zhu, with ADR funds, has been for several years, workingon the development of LYSO crystals for HEPVery attractive for the SuperB endcap EMC and the CMS upgrade


5x5 Projective LYSO array with CsI(Tl) surround

A 7x7 array is best, but it can beapproximated by a 5x5 arraysurrounded by CsI(Tl) to catchthe outer few percent of shower

CMS APD readout module2 @ 5mmx5mm APD(10x10mm APDs are now available)

16 spare BABAR CsI(Tl)crystals may be available


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 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

Conclusions






From the SuperKEKB web page


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 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)


SuperB+Lattice improvements

Interplay between metrology and New Physics sensitivity

Today

= ± 0.0028 = ± 0.0024

= 0.163 ± 0.028 = 0.344± 0.016

Improving the precision of Unitarity Triangle measurements, along with reducing theoretical uncertainties, can provide evidence

for New Physics


CMSSM : e vanishes at all SPS points MVF-NP extensions : e vanishes as s130is independent of s13

1 1 7510ab : 75ab for ( ), 7.5 for ( )

10 B B

LFV

2

5 disc

B B


107 B

(

M 1

/2

SuperB

SO(10) MSSMLFV from PMNS

LFV from CKMBeyond MFV

SUSY GUTnow

SuperB

Recent work :J.K.Parry, H.-H. Zhanghep-ph/0710.5443

Allowed by ms

From Bs phase

now

SuperB


t -¬

t -¬

t -¬ t -

¬

Flipping the helicity of the polarizedelectron beam allows us todetermine the chiral structureof dimension 6 four fermionlepton flavor-violating interactions

t -¬ t -

¬

Polarized ’s can probe the chiral structure of LFV

Dassinger, Feldmann, Mannel, and TurczykJHEP 0710:039,2007;

[See also Matsuzaki and SandaarXiv:0711.0792 [hep-ph]

t -¬t-¬

t -¬ -

¬ -

¬

-¬ -

¬

-¬


SPS4 is ruled out by exp value of (Bs)

SPS1a is the least favorable for flavor effects, but SuperB and only SuperBcan observe 2 deviations in several observables

Minimal Flavor Violation : SNOWMASS points


Many channels can show effects in the range S~(0.01-0.04)

New Physics in CPV: sin2 from “s Penguins”…

SuperB

(*) theory limited

d d

sb

W-

B0d

t ss

K0

g

sb b s

~

~ ~

23d

LR

X


1 10

1

10-1

10-2 (TeV)gluinom

is measured with a significance >3 away

from zero

23| |LR

23| |LR

Arg(23)LR=(44.5± 2.6)o

= (0.026 ± 0.005)

1 10

g

sb b s

~

~ ~

New Physics contribution (2-3 transitions)

23d

LR

MSSM + generic soft SUSY breaking terms

Flavor-changing NP effects in the squark propagator NP scale SUSY mass

flavor-violating coupling X

0.01

0.1

2

, ,

2, ,

( )qij LR RR LLq

ij LR RR LL

M

m

~ gm m


KB

Exhibit B: SM Branching fractions: Current 10ab-1 75ab-1 * , ( )SB K K K

Actual limit


CP Violation in charmNOW

SuperB

David Hitlin DOE Annual Review July 10, 2008 1 Super B The Super Flavor Factory David Hitlin DOE Annual Review of Caltech July 10, 2008.

Documents

mw super b

pager super b

overseas super b factory

new flavor symmetry

super flavor factory

scenario b

new physics scale

b ar components