end-of-run summary v2 - slac€¦ · e-polarization 85% 80% energy 45 gev 250 gev repetition rate...
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•UC Berkeley•Caltech•Jefferson Lab•Princeton•Saclay
•SLAC•Smith College•Syracuse•UMass•Virginia
7 Ph.D. Students60 physicists
Sep 97: EPAC approval1998-99: Design and Beam Tests2000: Funding and construction2001: Engineering run2002: Physics Runs 1 (Spring), 2 (Fall)2003: Physics Run 3 (Summer)
E158 CollaborationE158 Collaboration
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e- e-e
e
e
ee
-
-
-
-- e-
γZγZ 00
For E158, E=48 GeV, Q2=0.03 GeV2
At tree level, APV= -3 x 10-7
PVemeasPV
WPV
LR
LRPV
APAA
A
⋅=
−∝
+−
=
)sin41( 2θ
σσσσ
For a polarized electron beam and an unpolarized electron target,
Parity Violation in Parity Violation in MollerMoller ScatteringScattering
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Run 1: Spring 2002Run 2: Fall 2002Run 3: Summer 2003
E158 Physics RunsE158 Physics Runs
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Run 1: Spring 2002Run 2: Fall 2002Run 3: Summer 2003
E158 Physics RunsE158 Physics Runs
Total integrated data sample ~4X Run1 data sampleBeam performance met or exceeded all goals!
(intensity, polarization, jitter, efficiency)
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0.16%0.15%Energy Spread
80%85%e- Polarization250 GeV45 GeVEnergy120 Hz120 HzRepetition Rate
14.4 x 10115 x 1011Charge/Train
22%10%Beam Loading1.4ns0.3nsMicrobunch spacing267ns270nsTrain Length
NLC-500E-158Parameter
EE--158 Beam158 Beam(and comparison with 500 GeV Linear Collider Design)
IP Beam Instrumentation Groups for LC will be pushing for ESA beam tests!To demonstrate: i) precision beam energy and energy spectrum measurements
ii) precision polarimetryiii) beam diagnostics downstream of IP in presence of beamstrahlung
(mimic beamstrahlung and disruption angles with bremstrahlungand multiple scattering from a thick target)
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Observe ~ 2.5 ppm up-down asymmetry w/ horizontal polarization
First measurement of single-spin transverse asymmetry in e-e scattering.
Flips sign at 43 GeV
Asymmetry vs φ
Two-photon exchange QED effect
Theory References:1. A. O. Barut and C. Fronsdal, (1960)2. L. L. DeRaad, Jr. and Y. J. Ng (1975)3. Lance Dixon and Marc Schreiber; (higher order calc.
in progress)
Transverse Asymmetry in Transverse Asymmetry in MollerMoller ScatteringScattering
May also be useful for checking normalization factors (polarization, dilutions)
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E158 Run1 E158 Run1 MollerMoller AsymmetryAsymmetry
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Significance of parity nonconservation in Møller scattering: 3.6σ
APV(e-e- at Q2 = 0.027 GeV2): -151.9 ± 29.0 (stat) ± 32.5 (syst)
parts per billion(preliminary)
E158 Run1 ResultE158 Run1 Result
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E158 Preliminary (Run 1 only):sin2θW(MZ
2) = 0.2296 ± 0.0025 (stat) ±0.0027 (syst)
( )2MS2sin ZW Mθ
Weak Mixing AngleWeak Mixing Angle
E158 projected
SM Prediction(Czarnecki and Marciano)
±0.0012 ±0.0010Runs 1,2,3 projected:
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THANKS to Accelerator Operationsand all the Support Groups!!
From The E158 Collaboration
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THANKS to Accelerator Operationsand all the Support Groups!!
From The E158 Collaboration
… onto steps 4 and 5for the E158 experiment