Super Flavour Factories: SuperB Adrian Bevan Birmingham 11 th November 2009 Conceptual Design Report: arXiv:0709.0451 (hep-ex) http://web.infn.it/superb/index.php/home
Overview • What is SuperB? • Physics Case in the LHC era • Accelerator Aspects • Detector Design • Current Status • Summary Adrian Bevan March 2008 2
What is SuperB? Adrian Bevan March 2008 3
Site: Near Frascati • Asymmetric energy e + e - collider • Low emittance operation (like LC) • Polarised beams • Luminosity 10 36 cm -2 s -1 • 75ab -1 data at the # (4S) • Collect data at other $ s • Start data taking as early as 2015 • Crab Waist Precision B, D and ! decay studies and technique spectroscopy developed to achieve these goals • New Physics in loops – 10 TeV reach at 75ab -1 • International Community – Rare decays – " S CP violation measurements • Lepton Flavour & CP Violation in ! decay • Light Higgs searches • Dark Matter searches http://www.pi.infn.it/SuperB/ http://web.infn.it/superb/index.php/home Adrian Bevan May 2009 4 Geographical distribution of CDR signatories.
SuperB • Aims to constrain flavour couplings of new physics at high energy: – Refine understanding of nature if new physics exists at high energy. • We need to test the anzatz that new physics might flavour blind: – Case 1: trivial solution ! Reject more complicated models. – Case 2: non-trivial solution ! Reject flavour blind models. Quarks and neutrinos have non-trivial couplings. e,g, the CKM matrix – If the LHC doesn't find new physics: SuperB indirectly in the Standard Model of particle physics. How far fetched is a trivial flavour blind new physics sector? places constraints beyond the reach of the LHC and SLHC. Adrian Bevan March 2008 5
SuperB • Aims to constrain flavour couplings of new physics at high energy: – Refine understanding of nature if new physics exists at high energy. • We need to test the anzatz that new physics might flavour blind: – Case 1: trivial solution ! Reject more complicated models. – Case 2: non-trivial solution ! Reject flavour blind models. e.g. MSSM: 124 (160 with ! R ) – If the LHC doesn't find new physics: SuperB indirectly couplings, most places constraints beyond the reach of the LHC and are flavour SLHC. related. " 's are related to NP mass scale. Adrian Bevan March 2008 6
SuperB • Aims to constrain flavour couplings of new physics at high energy: – Refine understanding of nature if new physics exists at high energy. • We need to test the anzatz that new physics might flavour blind: – Case 1: trivial solution ! Reject more complicated models. – Case 2: non-trivial solution ! Reject flavour blind models. – If the LHC doesn't find new physics: SuperB indirectly places constraints beyond the reach of the LHC and SLHC. Adrian Bevan March 2008 7
SuperB • The measurements to be made at SuperB fall into two categories: – New physics sensitive goals of the experiment • Some of these physics processes will be discussed in a moment: B, D, # , ϒ , .... • This is why we want to build SuperB! – Standard Model calibrations ( I won't talk about this ) • This is how we validate our understanding of the detector: repeating measurements done by BaBar/ Belle and LHCb. • The equivalent of doing W, Z and PDF physics at ATLAS/CMS. Adrian Bevan March 2008 8
Case studies: 1. Lepton Flavour Violation : # decay as an example of many LFV measurements possible at SuperB. 2. Charged Higgs: what do we know; what will LHC tell us; what does SuperB add? 3. Neutral Higgs A0 : what can the flavour sector add to high p T searches? 4. ! S measurements : high mass particle interferometry. Physics Case in the LHC era Why is SuperB experiment relevant when we have the energy frontier experiments and LHCb? What is the minimum data set to make sure that we are doing something sensible? Adrian Bevan March 2008 9
Lepton Flavour Violation ( ! decay) e " beam polarization SuperB Sensitivity BR & Lower Background LHC(b) (75ab -1 ) SuperB • LHC is not competitive (Re: both GPDs and LHCb). • SuperB sensitivity ~10 – 50 % better than NP allowed branching fractions. Adrian Bevan May 2009 10
Lepton Flavour Violation ( ! decay) e " beam polarization SuperB Sensitivity BR & Lower Background LHC(b) (75ab -1 ) SuperB • LHC is not competitive (Re: both GPDs and LHCb). • SuperB sensitivity ~10 – 50 % better than NP allowed branching fractions. Adrian Bevan May 2009 11
Lepton Flavour Violation ( ! decay) • !' µ ( upper limit can be correlated to ) 13 (neutrino mixing/CPV, T2K etc.) and also to µ ' e ( . ~ SUSY seasaw = CMSSM + 3 + R + + • Complementary to flavour Herreo et al. 2006 mixing in quarks. • Golden modes: – !' µ ( and 3 µ . • e $ beam polarization: – Lower background – Better sensitivity than competition! • e + polarization may be used later in programme. • CPV in !' K S *+ at the level of ~10 -5 . • Bonus: – Can also measure ! g-2 (polarization is crucial). – , (g-2) ~2.4 % 10 -6 (statistically Use µ ( /3l to distinguish SUSY vs. LHT. dominated error). Adrian Bevan May 2009 12
Lepton Flavour Violation ( ! decay) • !' µ ( upper limit can be correlated to ) 13 (neutrino mixing/CPV, T2K etc.) and also to µ ' e ( . ~ SUSY seasaw = CMSSM + 3 + R + + • Complementary to flavour Herreo et al. 2006 mixing in quarks. • Golden modes: MEG (now) – !' µ ( and 3 µ . • e $ beam polarization: MEG (design) – Lower background – Better sensitivity than competition! • e + polarization may be used later in programme. • CPV in !' K S *+ at the level of ~10 -5 . • Bonus: – Can also measure ! g-2 (polarization is crucial). – , (g-2) ~2.4 % 10 -6 (statistically Use µ ( /3l to distinguish SUSY vs. LHT. dominated error). Adrian Bevan May 2009 13
Lepton Flavour Violation ( ! decay) • !' µ ( upper limit can be correlated to ) 13 (neutrino mixing/CPV, T2K etc.) and also to µ ' e ( . ~ SUSY seasaw = CMSSM + 3 + R + + • Complementary to flavour Herreo et al. 2006 mixing in quarks. SuperB • Golden modes: MEG (now) – !' µ ( and 3 µ . • e $ beam polarization: MEG (design) – Lower background – Better sensitivity than competition! • e + polarization may be used later in programme. • CPV in !' K S *+ at the level of ~10 -5 . • Bonus: – Can also measure ! g-2 (polarization is crucial). – , (g-2) ~2.4 % 10 -6 (statistically Use µ ( /3l to distinguish SUSY vs. LHT. dominated error). Adrian Bevan May 2009 14
Lepton Flavour Violation ( ! decay) BLUE • SU(5) SUSY GUT Model (arXiv RED :0710.5443, Parry and Zhang). • Model has non-trivial SUSY squark % s + " m s couplings. • Current BS mixing measurement favours B( # " µ ( )>3 ! 10 -9 . • Need SuperB to probe to this sensitivity. N.B. Different New " m s Physics Models have different features, and different hierarchies! Adrian Bevan March 2008 15
Lepton Flavour Violation ( ! decay) • SU(5) SUSY GUT Model (arXiv :0710.5443, Parry and Zhang). • Model has non-trivial SUSY squark couplings SuperB • Current BS mixing measurement favours B( # " µ ( )>3 ! 10 -9 . • Need SuperB to probe to this sensitivity. N.B. Different New Physics Models have different features, and different hierarchies! Adrian Bevan March 2008 16
Lepton Flavour Violation ( ! decay) • SU(5) SUSY GUT Model (arXiv :0710.5443, Parry and Zhang). • Model has non-trivial SUSY squark couplings • Current BS mixing measurement favours B( # " µ ( )>3 ! 10 -9 . • Need SuperB to probe to this sensitivity. N.B. Different New Physics Models have different features, and different hierarchies! Adrian Bevan March 2008 17
CMSSM: LHC/SuperB complementarity Blue = LHC: • Will be able to measure m(A) [CP odd Higgs mass] • Poor sensitivity to tan & [ratio of Higgs vevs] • Poor sensitivity to A [coupling] Red=LHC+EW/Low-energy constraints (includes SuperB): • Can build on the m(A) measurement to measure tan & . Again LHC and SuperB are complementary experiments. Each can contribute significantly to the Current analysis of data prefers knowledge of new physics. tan & ~10. March 2008 18
CMSSM: LHC/SuperB complementarity Blue = LHC: • Will be able to measure m(A) [CP odd Higgs mass] • Poor sensitivity to tan & [ratio of Higgs vevs] • Poor sensitivity to A [coupling] Red=LHC+EW/Low-energy constraints (includes SuperB): • Can build on the m(A) measurement to measure tan & . Again LHC and SuperB are complementary experiments. Each can contribute significantly to the Current analysis of data prefers knowledge of new physics. tan & ~10. March 2008 19
Charged Higgs: + • Within the SM, sensitive to f B and |V ub |: B SM ~1.6 % 10 -4 . , H - • B affected by new physics. – MFV models like 2HDM / MSSM. – Unparticles. • Fully reconstruct the event (modulo + ). 2HDM [T.Iijima @ Hints09] Signal Background arXiv:0809.4027, arXiv:0809.3834 2HDM: W.-S Hou PRD 48 2342 (1993) Adrian Bevan MSSM: G. Isidori arXiv:0710.5377 July 2009 20 Unparticles: R. Zwicky PRD 77 036004 (2008)
Charged Higgs • B-factory searches competitive with LHC era: e.g. 2HDM Existing Constraints from BaBar and Belle. Combined Higgs search constraint from ATLAS: arXiv:0901.1502 Converted constraints expected from ATLAS onto the plot by hand. U. Haisch 0805.2141 Adrian Bevan March 2008 21
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