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Super B The Super Flavor Factory

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

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Super B The Super Flavor Factory

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

  2. 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

  3. 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 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 1036asymmetric e+e-environment ?

  4. 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 INFN has now made aformal request to SLAC forPEP-II and BABAR Components 320 signers 80 institutions

  5. 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 ECMwill 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 • SuperBwill 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

  6. 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

  7. SuperB Experimental Hall & Transfer Line - +

  8. SuperBarameters SuperKEKB 8 IP beam distributions for KEKB 3.5 0.8 (0.4) 5000 12 | 5 9.4 | 4.1 3 Beam-beam transparency conditions in red 200 45 9 (24) 0.367 42 IP beam distributions forSuperB (without transparency conditions) 3 30 0.405 0.209 83

  9. 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 E. Paoloni

  10. B Physics: U(4S) Charm mixing and CPV Charm FCNC Bs Physics: U(5S) tPhysics

  11. A Super Flavor Factory is also a t factoryLepton Flavor Violation polarized e- beam: reduced background Very important order of magnitude 10-8 10-9 Complimentarity with meg

  12. LFV in t decays: SuperB capability SuperB sensitivity directly confronts many New Physics models BABAR SuperBsensitivity For 75 ab-1 We expect to see LFV events, not just improve limits

  13. Why do we need a very large sample ~75ab-1 ? Example: CPV in loop B decays Determination of coupling [in this case : (d13)LL] with 10 ab-1 and 75 ab-1 Im (d13)LL Im (d13)LL SM SM Re (d13)LL Re (d13)LL

  14. 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

  15. 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

  16. 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 16 spare BABAR CsI(Tl)crystals may be available CMS APD readout module 2 @ 5mmx5mm APD (10x10mm APDs are now available)

  17. 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

  18. From the SuperKEKB web page

  19. 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)

  20. Interplay between metrology and New Physics sensitivity SuperB+Lattice improvements Today r = ± 0.0028 h = ± 0.0024 r = 0.163 ± 0.028 h = 0.344± 0.016 Improving the precision of Unitarity Triangle measurements, along with reducing theoretical uncertainties, can provide evidence for New Physics

  21. LFV 5s disc B 2 B MVF-NP extensions : meg vanishes as s130 tmgis independent of s13 CMSSM : meg vanishes at all SPS points

  22. Beyond MFV LFV from CKM LFV from PMNS 107 B (tmg) now SO(10) MSSM SuperB SuperB M1/2 SUSY GUT now SuperB Allowed by Dms From Bs phase Recent work : J.K.Parry, H.-H. Zhang hep-ph/0710.5443

  23. Polarizedt’s can probe the chiral structure of LFV Flipping the helicity of the polarizedelectron beam allows us to determine the chiral structureof dimension 6 four fermionlepton flavor-violating interactions Dassinger, Feldmann, Mannel, and TurczykJHEP 0710:039,2007; [See also Matsuzaki and SandaarXiv:0711.0792 [hep-ph]

  24. 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 SuperBcan observe 2s deviations in several observables

  25. New Physics in CPV: sin2b from “s Penguins”… W- Many channels can show effects in the range DS~(0.01-0.04) s b f t s SuperB B0d s d d K0 ~ g ~ b s ~ b s X (*) theory limited

  26. 1 10-1 10-2 d is measured with a significance >3s away from zero 1 10 MSSM + generic soft SUSY breaking terms New Physics contribution (2-3 transitions) • Flavor-changing NP effects in the squark propagator • NP scale SUSY mass • flavor-violating coupling ~ g ~ b s ~ b s X 0.1 = (0.026 ± 0.005) Arg(d23)LR=(44.5± 2.6)o 0.01 1 10

  27. Exhibit B: SM Branching fractions: Current  10ab-1  75ab-1 Actual limit

  28. CP Violation in charm NOW SuperB

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