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Klaus P. Jungmann, Kernfysisch Versneller Instituut, Groningen, NL

The Muon g-2 Experiment. Klaus P. Jungmann, Kernfysisch Versneller Instituut, Groningen, NL on behalf of the muon g-2 collaboration. I nternational C onference on L inear C olliders 04 :  19-23 April 2004 - "Le Carré des Sciences", Paris, France. Standard Model Precision Experiment

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Klaus P. Jungmann, Kernfysisch Versneller Instituut, Groningen, NL

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  1. The Muon g-2 Experiment Klaus P. Jungmann, Kernfysisch Versneller Instituut, Groningen, NL on behalf of the muon g-2 collaboration International Conference on Linear Colliders 04 :  19-23 April 2004 - "Le Carré des Sciences", Paris, France Standard Model Precision Experiment Fundamental Constants Related Experiments Interpretation

  2. QED - Contributions: am(QED) = 116 584 705.6(2.9) * 10-11(Kinoshita 2000) Weak Interaction Corrections: m m m m m m Dam(weak) = 151(4) * 10-11(Kutho 1992, Degrassi 1998)

  3. ! ! Hadronic Corrections for gm-2 Dam(hadr.,1st order) = 6951(75)*10-11 (Davier, 1998) Dam(hadr., higherorder) = -101(6) *10-11 (Krause, 1996) Dam(hadr., light on light) = -79(15) *10-11 (Hayakawa, 1998) Situation Spring 2001

  4. Early “Shopping List”

  5. Trolley NMR Probes NMR Trolley Fixed NMR Probes Electrostatic Quadrupole Electrodes Trolley Rails Vacuum Vessel

  6. 900 000 000 positrons with E > 2GeV in 1999

  7. Fourier Spectra for different Run Conditions m- @BNL

  8. Systematic Uncertainties, Results Magnetic Field • wp,0 spherical probe 0.05 ppm • wp(R,ti) 17 trolley probes 0.09 ppm • wp(R,t) 150 fixed probes 0.07 ppm • wp(R) trolley measurement 0.05 ppm • < wp> muon distribution 0.03 ppm • wp (RI) others 0.10 ppm total systematic uncertainty dwp=0.17ppm Spin Precession • Pileup 0.08 ppm • Lost muons 0.09 ppm • Coherent Betatron Oscillations 0.07 ppm • Gain Instability 0.12 ppm • others 0.11 ppm total systematic uncertainty dwa,sy = 0.21 ppm total statistical uncertainty dwa,st = 0.6 ppm wp/2p = 61 791 400 (11) Hz wa/2p = 229 073.59(15)(5) Hz

  9. Theory: * need a for muon ! * hadronic and weak corrections *various experimental sources of a<better 100ppb>need constants at very moderate *a no concern for (g-2)maccuracy wa wammc Experiment: wp = am = mm wa emB - wp mp * wa and B (wp) measured in (g-2)m experiment <better 0.35 and 0.1 ppm> * c is a defined quantity <“infinite” accuracy> *mm (mm) is measured in muonium spectroscopy (hfs) <better 120 ppb> NEW 1999 *em is measured in muonium spectroscopy (1s -2s) <better 1.2 ppb> NEW 1999 *mp in water known >> probe shape dependence<< <better 26 ppb> *m3He to mp in water >> gas has no shape effect << <better 4.5 ppb> being improved

  10. Final results from Experiment E821 @BNL

  11. ! ! Hadronic Corrections for gm-2 Dam(hadr.,1st order) = 6951(75)*10-11 (Davier, 1998) Dam(hadr., higherorder) = -101(6) *10-11 (Krause, 1996) Dam(hadr., light on light) = -79(15) *10-11 (Hayakawa, 1998)

  12. The Muon g-2 Experiment Klaus P. Jungmann, Kernfysisch Versneller Instituut, Groningen, NL on behalf of the muon g-2 collaboration International Conference on Linear Colliders 04 :  19-23 April 2004 - "Le Carré des Sciences", Paris, France What next in Experiment? - Just run again ? - Is there more to it ? Standard Model Precision Experiment Fundamental Constants Related Experiments Interpretation How reliable is Theory ? What mean Speculations built on whishfull definition of Theory Value? What about Theory ? Are there other Experiments Neede to come further in Physics?

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  14. EDM closely related to non standard anomaly in many models! Exploit huge motional electric fields for relativistic particles in high magnetic fields; observe spin rotation Concept works also for (certain) nuclei; Deuteron particularly interesting

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