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The Physics Case for a Super B Factory

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The Physics Case for a Super B Factory The Physics Case For a Super B Factory Adrian Bevan Overview •Physics – Super B physics case. – Matter-antimatter asymmetry. – Higgs and new physics constraints. • Accelerator – Physics driven target luminosity. – Location(s) and current design. •Detector – Current design. • Conclusions Adrian Bevan 2 Overview •Physics – Super B physics case. – Matter-antimatter asymmetry. – Higgs and new physics constraints. • Accelerator – Physics driven target luminosity. – Location(s) and current design. •Detector – Current design. • Conclusions Adrian Bevan 3 Super B physics case g~ b ss b ~ (δ d ) + RR 23 η’ bR φ,η ,(KK) 0 s~ g ss ′ CP B R ss Ks0 ddd d KS • There is new physics at Λ~TeV. – it will have a flavour structure. – It will affect precision measurements at low energies through virtual loop corrections. • Many physics channelsAIMS: are complementary to the(1) LHC Precision programmes. understanding of SM flavour physics. • Many measurements are experimentally limited at 75ab(2) Elucidate-1. flavour structure beyond the SM. Adrian Bevan 4 Super B physics case g~ b ss b ~ (δ d ) + RR 23 η’ bR φ,η ,(KK) 0 s~ g ss ′ CP B R ss Ks0 ddd d KS • There is no new physics at Λ~TeV. – Higher scale new particles will affect precision measurements at low energies through virtual loop corrections. • Many physics channels are complementary to the LHC programmes.AIMS: (1) Precision understanding of SM flavour physics. • Many measurements are experimentally limited -1 at 75ab(2) Constrain. flavour structure beyond the SM. Adrian Bevan 5 Super B physics case g~ b ss b ~ (δ d ) + RR 23 η’ bR φ,η ,(KK) 0 s~ g ss ′ CP B R ss Ks0 ddd d KS • There is new physics at Λ~TeV. – it will have a flavour structure. – It will affect precision measurements at low energies through virtual loop corrections. • Many physics channels are complementary to the LHC programmes. • Many measurements are still experimentally limited at 75ab-1. Adrian Bevan 6 Overview •Physics – Super B physics case. – Matter-antimatter asymmetry. – Higgs and new physics constraints. • Accelerator – Physics driven target luminosity. – Location(s) and current design. •Detector – Current design. • Conclusions Adrian Bevan 7 Matter-antimatter asymmetry Equal amounts of matter and anti- matter created in the big bang. The universe expands, cools and the matter annihilates all of the anti- matter. We are trying to understand the mechanism that left us in a universe that is matter dominated. Adrian Bevan 8 Matter-antimatter asymmetry Equal amounts of matter and anti- matter created in the big bang. The universe expands, cools and the matter annihilates all of the anti- matter. We are trying to understand the mechanism that left us in a universe that is matter dominated. Adrian Bevan 9 Matter-antimatter asymmetry Equal amounts of matter and anti- matter created in the big bang. The universe expands, cools and the matter annihilates all of the anti- matter. We are trying to understand the mechanism that left us in this matter dominated universe. Adrian BevanWhat defines this broken symmetry?10 C, P, and T • Parity, P – Reflection of a system through the origin, converting right-handed into left-handed coordinate systems. – Vectors (momentum) change sign, but axial vectors (spin) remain unchanged. • Charge Conjugation, C – Change all particles into anti-particles and visa versa. •Time Reversal, T – Reverse the arrow of time: reverse all time- dependent quantities, e.g. momentum. Need CP violation to generate a matter-antimatter asymmetry 11 Adrian Bevan Sakharov, JETP Lett. 5 (1967), 24 Observation of CP violation • CP violation was first • ... and later in B-meson observed in K-meson decays decays ... – BaBar & Belle, 2001. – Christenson et al. 1964 B0→K+π− B0→K−π+ CP violation in B→Kπ (2004) The search for KL→ππ Observed level of CP violation is 9 orders of magnitude too smallAdrian to Bevan explain our universe. 12 Fundamental particles • Quarks change type through interactions with a W±. • Starting to probe lepton sector with neutrino experiments e.g. T2K. ν μτ→ν (Super K) ν μ →ν e (searching for) • No observed lepto- quark interactions. Adrian Bevan 13 Fundamental particles • Quarks change type through interactions with a W±. • Starting to probe lepton sector with neutrino experiments e.g. T2K. ν μτ→ν (Super K) ν μ →ν e (searching for) • No observed lepto- quark interactions. Adrian Bevan 14 The GIM mechanism • Before 1970: – Technical problems existed in calculations of kaon decays with only the know quarks at that time: u,d and s. • 1970: PRD 2 1285 – Glashow Iliopoulos and Maiani postulated the charm quark as a way to solve these problems. • ‘November revolution’: 1974 groups at Brookhaven and SLAC independently discovered the J/Psi, establishing the charm quark. – Burt Richter and Sam Ting shared the 1976 Noel Prize for physics for their discovery. SLAC’s data BNL’s data Historically, virtual effects have led to a number of discoveries in particle physics. ee+−→→ J/ Psi ee +− Adrian… and Bevan we now know 6 quarks exist. 15 The GIM mechanism • Before 1970: – Technical problems existed in calculations of kaon decays with only the know quarks at that time: u,d and s. • 1970: PRD 2 1285 – Glashow Iliopoulos and Maiani postulated the charm quark as a way to solve these problems. • ‘November revolution’: 1974 groups at Brookhaven and SLAC independently discovered the J/Psi, establishing the charm quark. – Burt Richter and Sam Ting shared the 1976 Noel Prize for physics for their discovery. SLAC’s data BNL’s data Historically, virtual effects have led to a number of discoveries in particle physics. ee+−→→ J/ Psi ee +− Adrian… and Bevan we now know 6 quarks exist. 16 The CKM matrix • The couplings between qi and qj + qucti = ,, W V = Vij qdsbj = ,, • Form a 3x3 unitary matrix: CKM Matrix Wolfenstein Parameterisation: λ ~0.22 ⎛⎞1/2− λ 2 λ Aiλρ3 ( − η) ⎜⎟A ~0.8 VA=−λλ1/2 −λ 22 +O ()λ 4 ⎜⎟ρ ~ 0.2− 0.27 ⎜⎟Aλ3 (1 −−ρ iη) −Aλ 2 1 ⎝⎠η ~ 0.28− 0.37 Understanding Standard Model CP Violation means accurate measurementsAdrian Bevan of ρ and η 17 The CKM matrix • The couplings between qi and qj + qucti = ,, W V = Vij qdsbj = ,, • Form a 3x3 unitary matrix: CKM Matrix Wolfenstein Parameterisation: λ ~0.22 ⎛⎞1/2− λ 2 λ Aiλρ3 ( − η) ⎜⎟A ~0.8 VA=−λλ1/2 −λ 22 +O ()λ 4 ⎜⎟ρ ~ 0.2− 0.27 ⎜⎟Aλ3 (1 −−ρ iη) −Aλ 2 1 ⎝⎠η ~ 0.28− 0.37 Understanding Standard Model CP Violation means accurate measurementsAdrian Bevan of ρ and η 18 The unitarity triangle • Study decays involving b→u and t→d transitions to probe the weak phase of Vub and Vtd. ⎛⎞VVud us Vub ⎜⎟ B →ππ, ρπ, ρρ etc. VV= VV ⎜⎟cd cs cb ⎜⎟ ⎝⎠Vtd Vts Vtb B→ccs (e.g. J/ψK0), ccd (e.g. J/ψπ0), η’,ω,φK0 etc. B→D(*)K(*) etc. • B-factories have measured β to ~1° in ccs, and starting to do precision measurements in charmless b→s penguin decays. • α is measured to 7°. • Now starting to constrain γ. Adrian Bevan 19 Elucidating the CKM mechanism • With 50 ab-1 : precision over-constraint of the UT! α Use ππ, ρπ, ρρ β Use ccs, assume theory error can be better constrained. γ Use B→DK, 0 + - D →π π Ks α ∼ 12− ρ =±0.165 0.009 (5%) η =±0.324 0.004 ()1.3% CKM Metrology with β ∼ 0.2 unprecedented precision γ ∼ 2 Just angles Adrian Bevan 20 30 evolution of the ρ−η plane Adrian Bevan 21 Can we break the unitarity triangle? Current Precision with all constraints. Extrapolating existing measurements to super-B luminosity. Adrian Bevan 22 Overview •Physics – Super B physics case. – Matter-antimatter asymmetry. – Higgs and new physics constraints. • Accelerator – Physics driven target luminosity. – Location(s) and current design. •Detector – Current design. • Conclusions Adrian Bevan 23 b→s ‘penguin’ loops b H ... s •sin2β from ccs can differ from other loop dominated sin2βeff if new particles contribute to the loop. • Need high statistics to observe deviation for any given mode. • η’K0, K+K−K0 and φK0 are the ‘golden modes’ Adrian Bevan 24 Standard Model corrections to ΔS • A variety of theoretical calculations have been Theory error on ΔS made to estimate the from penguin mode theory error on ΔS mode by mode. • Current best levels of constraint are ~0.01. sin2β experimental Uncertainty. • This theory error becomes a ΔS QCDF: (Beneke, PLB620 (2005), SU(3): Grossman et al, PRD68 limiting factor with approx 143-150, Cheng et al., PRD72 (2003) 015004; Gronau et al, (2005) 094003 etc. PRD71 (2005) 074019; …). -1 SCET: (Williamson & Zupan, 50ab of data. hep-ph/0601214) Can estimate ΔS and mostly see a positive shift. • η’K0 is the most promising channel – most precise sin2βeff currently measured & CPV has been observed + − –B→K K Ks ( φKs) is next on the list. Adrian Bevan 25 Predictions for the future • Extrapolations from BaBar analysis indicate % level precision at ~50ab-1. From SLAC-R-709 Best: B→η’K0 2nd best:B→K+K-K0 (Dalitz) 3rd best:B→φK0 ≈η’K0 Adrian Bevan 26 B+→τ+ν • Suppressed by Vub SM prediction Gmm22⎛⎞ m 2 B ()Bl++→=υ FBl 1|| − l f 2 V 2 τ (1.59± 0.40) x 10-4 SM lB⎜⎟2 B ub 8π ⎝⎠mB – Within the SM, this measurement can be used to constrain fB. Shaded region = 95% Prob. • Can Can constrain replace theW+ apexwith H+ of–B the canunitarity be suppressed triangle using or enhanced by a factor this measurement of rH Complements the angle measurements http://utfit.roma1.infn.it/ Adrian Bevan 27 B+→τ+ν • Suppressed by Vub SM prediction Gmm22⎛⎞ m 2 B ()Bl++→=υ FBl 1|| − l f 2 V 2 τ (1.59± 0.40) x 10-4 SM lB⎜⎟2 B ub 8π ⎝⎠mB – Can replace W+ with H+ – can be suppressed B Shaded region = 95% Prob.
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