Name: Wits ICPP-iThemba LABS Seminars in Particle Physics
Start: 2021-06-30T10:00:00+02:00
End: 2023-12-22T17:00:00+02:00
Location: No location set

Wednesday, 30 June
- 14:30 → 15:30
  
  New results from the Muon g-2 experiment at Fermilab 1h
  
  At the beginning of 2000's the E821 experiment at Brookhaven (USA) has measured the anomalous magnetic moment of the muon (known also as muon g-2) with a precision of 0.54 parts per million, finding a discrepancy of about three standard deviations with the theoretical prediction of the Standard
  Model. This longstanding discrepancy is one of the most intriguing hints of new physics in particle physics. In order to understand this discrepancy a new Muon g-2 experiment has been approved at Fermilab (USA) and started taking data in 2018. We will report the first results of the new Muon g-2
  Experiment at Fermilab which measured the muon g-2 with a precision slightly better than the BNL one
  
  Speaker: Prof. Graziano Venanzoni
  
  New results from the Muon g-2 experiment at Fermilab: Prof Graziano Venanzoni
  
  Wits ICPP iTL poster.pdf
Wednesday, 21 July
- 14:30 → 15:30
  
  Muon g-2 in the standard model and a lattice QCD calculation of the leading hadronic contribution 1h
  
  Twenty years ago in an experiment at Brookhaven National Laboratory, physicists measured the muon's
  anomalous magnetic moment, , with a remarkable precision of 0.54 parts per million.
  Since then, the standard model prediction for has exhibited a discrepancy with experiment of over 3
  standard deviations, raising the tantalising possibility of physical particles or forces as yet undiscovered.
  On April 7 a new experiment at Fermilab presented its first results, brilliantly confirming Brookhaven's
  measurement and bringing the discrepancy with the standard model to a near discovery level of 4.2 . To
  fully leverage this and future measurements, and possibly claim the presence of new fundamental
  physics, it is imperative to check the standard model prediction with independent methods, and to reduce
  its uncertainties. After an introduction and a discussion of the current experimental and theoretical status
  of , I will present a precise lattice QCD calculation, by the BMW collaboration, of the contribution to
  this quantity that most limits the precision of the standard model prediction. The result of this
  calculation significantly reduces the gap between the standard model and experiment, and suggests that
  new physics may not be needed to explain the current, experimental, world-average value of
  
  Speaker: Prof. Laurent Lellouch (CNRS & Aix-Marseille U)
Wednesday, 11 August
- 14:30 → 15:30
  
  Which way beyond the Standard Model is the muon magnetic moment pointing? 1h
  
  The Fermilab muon g-2 experiment has recently confirmed the previous Brookhaven measurement, and both are in apparent tension with calculations within the Standard Model. After reviewing the history of theoretical calculations and experimental measurements of the muon g-2, I will discuss possible interpretations of this tension, including alternative Standard Model calculations as well as scenarios for physics beyond the Standard Model, including leptoquarks, a Z’ boson and supersymmetry.
  
  Speaker: Prof. John Ellis (CBE FRS King’s College London)