The Super Flavour Factory ������������������ ������������������ ������������������ ������������������ ��������� ��������� ��������� ���������� � ������������������� � � ������������������� ������������������� ������������������� OXFORD June 9, 2009 Oxford June 9,2009 Marcello A. Giorgi 1
Outline • A bit of Physics • Progress in understanding the High Luminosity machine • Now a Machine Baseline. • A Detector Baseline • About the process: a touch of History • Report from ECFA to CERN Council • INFN formal start up of TDR Phase • Organizing the TDR effort. • Organization of Accelerator effort • Detector organization • Physics Next steps. Oxford June 9,2009 Marcello A. Giorgi 2
Super Flavour Physics GOAL : ��������������������� ���������������� beauty , charm, tau CPV asymmetries, FCNC loops, LFV, Tau mag.moment, EDM Oxford June 9,2009 Marcello A. Giorgi 3
How move to New Physics Move to New Physics in two ways: Quantum way ~ Relativistic way g s b ( δ 23 d RR ) ~ + b R ~ g s s R s d d LHC (Energy Frontier) Flavor (High precision measurements) The two ways are complementary 4 Marcello A. Giorgi 4
High Luminosity potential • Flavour precision measurements sensitive to New Physics (NP) See M.Ciuchini Talk at Orsay SuperB workshop. – Measure interference effect in known processes Feb.17,09 – Measure decays: rare or forbidden in Standard Model • NP effects governed by – New Physics Scale NP( Λ ) – Effective coupling C • Different Intensities (from interactions) • Different Patterns (for instance from simmetries) With 7-10x10 10 pair bb, cc, ττ (75-100 ab -1 ) it is possible NP(Λ) found at LHC NP(Λ) not found at LHC •Determine couplings FV e CPV of NP •Look for indirect signals of NP •Look for heavier states •Link them to explaining NP models •Study the flavour structure of NP •Constrain regions in parameter space with NP( Λ ) sensitivity up several tens of TeV. Some channels as τ LFV clear segnals of NP Marcello A. Giorgi 5
(Some) Results of B-Factories B � τν setting limits on Spectroscopy of new, Unitarity Triangle precision What in the next decade will e+ e- factories say about new physics and contribute as complementary to LHC and LHCb ? unexpected states MSSM parameters measurements η η γ New DK state(s) at 2.86GeV/c 2 1 1 ∆ m β ∆ m d d ∆ m s 0.5 0.5 ε V ub K V cb 0 0 D s2 (2573) + α -0.5 -0.5 -1 -1 Well beyond the original goals -1 -1 -0.5 -0.5 0 0 0.5 0.5 1 1 ρ ρ D 0 – D 0 mixing No Mixing Marcello A. Giorgi 6 6 6 6 Valencia Marcello A. Giorgi 6 Dec16,2008
Physics activity Physics goals have been discussed inside the SuperB community in the CDR published in May 2007 and in the proceedings of the Valencia SuperB Workshop in 2008 .It was reviewed in April 2008 by the IRC appointed by the President of INFN. Activity in 2009, preliminary Workshop on New Physics with SuperB document with “realistic” sensitivities ready by the end 14th-17th April 2009 of 2009 Oxford June 9,2009 Marcello A. Giorgi 7
Improving CKM precision NOW ! ρ = 0.163 ± 0.028 η = 0.344 ± 0.016 ρ = ± 0.0028 Improving CKM is η = ± 0.0024 crucial to look for NP 75 ab-1 SuperB and Lattice calculation improvement Marcello A. Giorgi 8
B Physics @ Y(4S) Charm mixing and CP Charm FCNC τ Physics B s Physics @ Y(5S) Marcello A. Giorgi 9
Higgs-mediated NP in MFV at large tan β 2ab -1 10ab -1 2ab -1 M H ~0.4-0.8 TeV for tan β ~30-60 tan β tan β How signal would like 75ab -1 with MH=350GeV SuperB - 75ab -1 M H ~1.2-2.5 TeV for tan β ~30-60 tan β tan β Importance of having very large sample ≥ 75ab -1 10 10 10 10 Marcello A. Giorgi 10
Determination of coupling [in this case : ( δ 13 ) LL ] with 10 ab -1 and 75 ab -1 Im ( δ 13 ) LL Im ( δ 13 ) LL SM SM Re ( δ 13 ) LL Re ( δ 13 ) LL Importance of having very large sample >75ab -1 Marcello A. Giorgi 11
COMPLEMENTARY: LHC and Flavour with 75 ab -1 IF LHC DISCOVERS SUPERSYMMETRY VALENCIA PROCEEDINGS EXAMPLE FROM Red are LHC+EW constraints + Blue is LHC alone Marcello A. Giorgi 12
From LHCb, expect: LHC upgrade with 100fb -1 Only LHCb? F.Muheim SuperLHCb vs. SuperBfactory at 50 ab -1 Marcello A. Giorgi 13
Requirements to the physics goal (NOT ONLY LUMINOSITY!) L peak ≥ 10 36 cm -2 s -1 ( asymmetric 7.0+4.0 GeV E cm = m Y(4s) ). • 85% Polarization di e - (7.0GeV) for τ : • T and CP Violation BKG reduction in LFV, distinguish among LFV models. τ g-2. Option to run SuperB still with a luminosity of 10 35 cm -2 s -1 at charm threshold • (4 .0 GeV ) . Pure DD bar , no additional fragmentation. • High signal/bkg : optimal for channels with Quantum Coherence: unique opportunity to measure D 0 -D 0 • bar relative phase. ~10 9 DD /month at 10 35 cm -2 s -1 . (using • σ (e + e - → D 0 D 0 )~3.6 nb + σ (e + e - → D + D - )~2.8 nb ~ 6.4 nb as measured by CLEO-C) • Misure dipendenti dTime dependent measurements at4 GeV as for B sector at Y(4s) in BABAR and Belle. I will be only possible at SuperB. In TDR these topics should be better addressed. Marcello A. Giorgi 14
LFV in tau and muon decay Standard Model allows LFV.In charged leptons it can occur in loops with expected low branching fractions. Es: expected Br ( τ � µγ ) <O (10 -40 ÷10 -54 ) Even less in 3 leptons For this contribution a b c b But with all contributions becomes larger than and expected same order of : c a � � α ∆ � � c ∆ � � = � � − � � ∑ − �� � τ → µγ � = � � � < �� �� �� �� ν � ν � τ � µ � � �� π � � = ��� � Observable lepton decays with FV will allow a clear indication of New Physics.Many New Physis models predict strong enhancement of violating decays of µ and τ . In many models measurable and even quite large τ BR [O(10 -8 )] are expected . Marcello A. Giorgi 15
is also a τ τ factory � golden measurement LFV τ τ (Complementarity with µ � e γ) Further improvements if polarized beams. Optimization of BKG rejection is in progress. Pol. Helps also to discriminate models. In some model there is a strong effect on the angular distribution of µ µ from signal: µ µ Marcello A. Giorgi Marcello A. Giorgi 16
Comparison with Snowmass points on Tau using also Polarization SuperB with 75 ab-1, evaluation assuming the most conservative scenario about syst. errors LFV 5 σ σ disc σ σ 1 ÷ 2 SuperKEKB worse by a factor 2.5 and 4.5 in τ→ µγ and >5 in τ→ 3µ Marcello A. Giorgi 17
Tau g-2 Start with the expt. with µ <1 Make use of all the informations (total x-section,angular distribution, f-b asymmetry. Measure Re and Im parts Marcello A. Giorgi 18
Charm • Charm events at threshold are very clean: pure DD, no additional fragmentation • High signal/bkg ratio: optimal for decays with neutrinos. • Quantum Coherence: new and alternative CP violation measurement wrt to ϒ (4S). Unique opportunity to measure D 0 -D 0 relative phase. • Increased statistics is not an advantage running at threshold: cross- section 3x wrt 10GeV but luminosity 10x smaller. SuperB lumi at 4 GeV = 10 35 cm -2 s -1 produces ~10 9 DD pairs per • month of running. (using Cleo-c cross-section measurement [ σ (e + e - → D 0 D 0 )~3.6 nb ] +[ σ (e + e - → D + D - )~2.8 nb] ~ 6.4 nb) • Super tau-charm could well study mixing and CP violation direct/indirect , but not in time dependent analysis as done in in B factories. Time-dependent measurements at 4 GeV only possible at SuperB • to extract weak Phase thanks to the improved time measurement and to the option of running at charm threshold. Marcello A. Giorgi 19
CP Violation in charm from mixing NOW SuperB Achievable in SuperB but also in 10 35 Super τ charm 20 Marcello A. Giorgi
Time dependent measurements at DD threshold: only possible at SuperB • Proper time resolution dominated by decay vertex resolution. – Production vertex precisely determined thanks to nm beamspot dimensions With Super B lumi at 4 GeV = 10 35 cm -2 s -1 expected ~10 9 DD per month SuperB nominal boost βγ ct = 0.28 × 120 µ m ~ 30 µ m Average flight distance similar to vertex resolution → σ � � τ βγ βγ βγ βγ Marcello A. Giorgi 21
Summary of Physics Goals • Increase by O(10) the precision of BaBar &Belle (*) • Challenge CKM at the level of 1% (*) τ LFV sensitivity improvement by a factor between 10 and • 100. Beam Polarization option • Explore T-violation in τ . and possibility to run at • Search for magnetic structure of τ . charm threshold • Explore CPV in Charm. • Great new Spectroscopy exploration. It can be allowed with 75 ab -1 in 5 years at Y(4s) and a few months at Charm threshold with peak lumi of 10 35 cm 2 s -1 . Marcello A. Giorgi 22
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