Measuring the weak mixing angle with the P2 Experiment at MESA PDF
Preview Measuring the weak mixing angle with the P2 Experiment at MESA
Measuring the weak mixing angle with the P2 Experiment at MESA Niklaus Berger Institut für Kernphysik, Johannes-Gutenberg Universität Mainz Oxford, May 2018 Overview • Searching for new physics at the intensity frontier • The running weak mixing angle • The MESA accelerator • The P2 Experiment See: The P2 Experiment - A future high-precision measurement of the electroweak mixing angle at low momentum transfer arXiv:1802.04759 Niklaus Berger – Oxford, May 2018 – Slide 2 The Standard Model of Elementary Particles Niklaus Berger – Oxford, May 2018 – Slide 3 Hugely successful Magnetic moment of the electron: • Theory: g = -2.002 319 304 363 56 (154) e (Aoyama et al., PRL 109, 111807 (2012)) • Experiment: g = - 2.002 319 304 361 53 (53) e (Hanneke et al. PRL 100, 120801 (2008)) Niklaus Berger – Oxford, May 2018 – Slide 4 Open Questions? Open Questions? Gravity, Dark Matter, Dark Energy, Matter-Antimatter- Asymmetry, Hierarchy Problem, Flavour,... Open Questions? Gravity, Dark Matter, Dark Energy, Matter-Antimatter- Asymmetry, Hierarchy Problem, Flavour,... There has to be more... Where is the new physics? • Not where we already looked... • Could be at very high energies • or at very weak couplings Increasing mass Previously expected Searches for region for heavy particles with new particles d e d large couplings u cl x e y all t n e m g e ri p n x E i l p u o c g Terra incognita n i Searches for light s a particles with small e r couplings c e D Niklaus Berger – Oxford, May 2018 – Slide 8 Direct production Niklaus Berger – Oxford, May 2018 – Slide 9 Indirect effects in quantum loops Niklaus Berger – Oxford, May 2018 – Slide 10
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