David Hitlin US/Canada SuperB Meeting July 25, 2008 1 Super B US/Canada Meeting Introduction David Hitlin July 25, 2008

David Hitlin US/Canada SuperB Meeting July 25, 2008 1

SuperB US/Canada Meeting

Introduction

David HitlinJuly 25, 2008


IntroductionWhy we are here ?

The SuperB project is gaining momentum, particularly within DOE, after a renewed emphasis on flavor physics by P5

Organizing the US (Canadian) physics community is obviously a crucial element in moving forward with DOE/NSF/(NSERC)

We hope today to take some strides in this direction

The program Introduction - David Hitlin INFN Status – Marcello Giorgi The SuperB Collider – John Seeman The US SuperB Project – David Leith Discussion


Progress [Marcello will fill us in on progress in Italy and the rest of Europe]

The recent P5 report recommends, in Scenario B and above, US participation in an overseas Super B factory

There are two proposals on the market1. 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 MW2. 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

If you’re interested in 1), you’re in the wrong meeting

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




The North American flavor physics community

The current BABAR author list has 34 US and 3 Canadian institutions [henceforth rendered as 34(3)]

There is also, potentially, interest from the CLEOc, BES, CDF.D0,…….. flavor communities Many institutions have, of course, made other commitments at LHC,

T2K, etc. The size of the overall SuperB collaboration is bound to be smaller than

that of BABAR, perhaps approximating the size of Belle

The SuperB CDR had 65(5) signers from 12(3) institutions, including SLAC A letter we sent to Steve Kahn and David MacFarlane in October, 2007

urging that SuperB be a component of the SLAC PPA program going forward had 24(6) PI signers from 18(4) institutions, not including SLAC

It is difficult to project asymptotic numbers, but for the US, 100-150 faculty, postdocs and students seems like an achievable goal


Primary physics objectives of a Super Flavor Factory

The crucial role that flavor physics will play in understanding New Physics found at the LHC is becoming ever more clear to the community (P5)

Sensitivity to New Physics at scales accessible to the LHC requires 50-75 ab-1 which can be provided by a collider with a luminosity of 1036 in ~5 years

A polarized electron beam adds important and unique capability

SuperB can perform measurements in the quark and lepton 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, SuperB can still 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 ?


Charm FCNC

Charm mixing and CPVB Physics: (4S)

PhysicsBs Physics: (5S)


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


polarized e- beam: reduced background

Very important order of magnitude: 10-8 10-9

Complimentarity to en.b.: in neutrinos, the mixing is 2<->3

A Super Flavor Factory is also a factory Lepton Flavor Violation


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 -¬-

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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 : (LL)13] with 10 ab-1 and 75 ab-1

Im (

13) L

L

Im (

13) L

L

SM

SM

d

d0

Lb

Ls

13

dLL


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


CP asymmetries (T-odd) in decays *B K K

Bobeth, Hiller and Piranishvili have recently shown that CP violation beyond the SM can produce large CP asymmetries in the C7,9,10 Wilsoncoefficients in decays. These can be disentangled in a model-independent way with an angularanalysis in the low q2 region

*B K K

Needs a sensitivity analysis


CP Violation in charmNOW

SuperB


Moving forward The proto-Collaboration (a rather small group) has already

produced an impressive CDR We now entering the TDR phase

TDR responsibilities must be worked out in the near future These will evolve into project responsibilities over the next

two years or so INFN is beginning to provide R&D funding for Italian groups Organizational activities have begun in Canada, the UK, and to

some extent in France It is a good time for interested US groups need step up to the plate In the US there has been to date some activity in PID, EMC, trigger,

computing and physics tools On July 9, Hitlin, Jawahery, Leith, MacFarlane and Seeman met with a

group from the DOE Program Office (Crawford, Debenham, Kovar and Nicholson)

They may see SuperB as an important opportunity for the program We were encouraged that if university groups expressed interest to DOE

in SuperB involvement, there would be a favorable response NSF response as yet not well understood (NSERC ???) INFN has formally requested the PEP-II/BABAR components John Kogut (Dr. Electron) will shortly be making a presentation to

SC-1 regarding Super B Factories


Raise your hands Seminars

A classic method of spreading the word is seminars and colloquia at prospective collaborator’s home institutions We need to develop a cadre of potential speakers to respond to

requests We need some requests

Get involved in the ongoing SuperB meetings Speak to your funding agency monitor

Flavor physics is no longer a taboo subject at DOE; they are likely to respond

How do we proceed?



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 the 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 early 2009, followed by INFNMinistry TDR effort is beginning: construction 5 years : luminosity in 2015-16

Documents

David Hitlin US/Canada SuperB Meeting July 25, 2008 1 Super B US/Canada Meeting Introduction David Hitlin July 25, 2008