Experimental tests of the SM (3): non-collider particle physics FK8022, Lecture 7 Core text: Further reading:

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Presentation transcript:

Experimental tests of the SM (3): non-collider particle physics FK8022, Lecture 7 Core text: Further reading:

Collider vs non-collider physics (1) Can see new physics ? Max energy scale Max precisionCharacterisation of new physics Colliders Good – precision measurements of particle masses/couplings. Non-colliders Poor There is life beyond the large collaborations. New physics often found at the high energy/high precision frontiers. Colliders and non-colliders offer complementarity.

Collider vis non-collider physics (2) TopicScenario Anomaous charge ( q<<e ) Millicharged partices Proton decayGUTs Neutrinoless double  -decay AxionsDark matter/strong CP problem Electric dipole moments Precision SM test – search for new physics Magnetic dipole moments Precision SM test – search for new physics Non-colliders also perform studies for specific scenarios or (mad ) speculative ideas which are impossible for colliders to probe. Impossible to cover all in one lecture. Neutrinoless double  -decay covered by Thomas. Dipole moment measurements/searches among the most high profile of non-collider research (this lecture) Give a flavour of the type of work which is done and how its done. Major neutrino expts not listed (see Thomas’ lectures)

Dipole moments

Electric dipole moments violate T -invariance OR T A non-zero permanent electric dipole moment violates T -invariance!

Electric dipole moment Similar argument can be made for Parity. A permanent EDM violates P and T. – CP also violated ( CPT invariance) Standard Mode CPV predicts tiny EDMs Searches for EDMs test strong CP sector of the SM Sensitive to many exotics scenarios

SM and BSM contributions to electron-EDM Electroweak 4 loops + cancellation needed. Standard Model 1 loop sufficient CP -violating phase Supersymmetry

x y z A simple generic EDM experiment (1)

x’ y’ z’ A simple generic EDM experiment (2)

Experimental sensitivity

Worldwide EDM Community

Limits on particle EDMs ParticleUpper limit on | d | (ecm) SM prediction ( e cm) n e  p

ACME (2013) e- EDM predictions and limits (D. DeMille)

Neutron EDM searches 7 orders of magnitude in precision gained. Eating into SUSY/exotic parameter space.

Gyromagnetic ratio in classical physics

Gyromagnetic ratio in quantum mechanics

Gyromagnetic ratio in quantum field theory + infinite number of diagrams =+ =

Some more Feynman diagrams… Subset of the SM processes which need to be calculated. Sensitivity to a range of TeV-scale BSM scenarios Eg SUSY

Measurements of g

E821 Experiment (Brookhaven) Measuring the muon gyromagnetic ratio

Measurements of muon g-2

Theoretical uncertainties SourceContribution to a  x Contribution to da  x QED Hadronic vacuum polarisation 7007 EW QED HadronicEW