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Report on ICHEP06 Moscow, Russian Federation
Lee Pondrom, UW Madison, 25 Sept 2006
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Possible new c-cbar states
Several new resonances have been seen at the B factories-daughters of B decays One prominent signature is X->J/ψ The X(3872) has been confirmed at the Tevatron.
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CP violation in the B sector
This is a busy area, only a few things will be discussed
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Kobayashi-Maskawa Phase
l ~ 0.22 CP violation is due to a complex phase in quark mixing matrix CP violation parameters (f1, f2, f3) = (b, a, g )
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xCP : CP eigenvalue, +1 (-1) for CP even (odd)
sin2f1 measurement B0 q p fCP _ d b c s w B0 J/y K0 _ t d b w B0 V*td V*td = A CP G (Dt ; B0J/yK0) - G (Dt ; B0J/yK0) G (Dt ; B0J/yK0) + G (Dt ; B0J/yK0) _ = -xcpsin2f1 sin(DmDt) + A cos (DmDt) Mixing induced CPV Direct CPV (A = -C) xCP : CP eigenvalue, +1 (-1) for CP even (odd) A=0
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Principle of TCPV measurement
CP-side m+ J/y B0 _ m- (4S) resonance B1 electron (8GeV) KS/L B0 positron (3.5GeV) nm B2 p- bg = (Belle) 0.56 (BaBar) K+ p- Flavor tag and vertex reconstruction Dz ~ 200mm (Belle) m+ Fully reconstruct one B-meson which decays to CP eigenstate Tag-side determines its flavor Proper time (Dt) is measured from decay-vertex difference (Dz)
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B0J/y KS , KL B0 J/y KS B0 J/y KL Belle preliminary
B0 J/y KL B0 tag B0 tag B0 tag _ B0 tag _ CP odd : xCP=-1 CP even : xCP=+1 sin2f1= ±0.038 A = ±0.028 sin2f1= ±0.057 A = ±0.033 Sig Sig+BG stat error stat error
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Constraint on the Unitarity Triangle
_ Time-dependent Dalitz analysisof B0 D[ KSp+p- ]h0 hep-ex/ submitted to PRL f1=70o ? f1=20o Disfavored at 98.3% C.L. ? (^_^) f1 = 20.0o ± 1.3o (Belle data only)
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The unitarity triangle: a year ago
Already many observable quantities are over-constraining the unitarity triangle.
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Electroweak Sector Here again only a few topics
Charged currents at HERA Top mass Single top production
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Cosmic Rays Highest energies – Auger detector
Atmospheric neutrinos and Super K
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1 particle/km2/century
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Above Ethr ≈ 7*1019 eV, protons loose rapidly energy via pion photoproduction. Interaction length ≈ 6 Mpc Energy loss ≈ 20 % / interaction p + γ 2.7 K → N+ π
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Auger hybrid detector Fluorescence Detector (FD)
Longitudinal development of the shower Calorimetric measurement of the energy Calibration of the energy scale Direction of the shower 12% duty cycle ! Surface Detector (SD) Front of shower at ground Direction of the shower “High” statistics
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The Auger Observatory Completion in 2007 50 km Total area ~3000 km2
1600 Surface detectors (“water tanks”) 24 fluorescence telescopes 6 in each of 4 buildings About ¾ installed and operational Completion in 2007 50 km
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Statistics is now about ½ year of full Observatory (~7000 km2 sr yr)
Efficiency =100% above 3 EeV Systematic error on the energy ±~ 25%
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Lots more stuff of course
The end
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