Hadronic Contributions to New Physics Searches 2019

Session

$g-2$

26 Sept 2019, 09:30

Puerto de la Cruz, Tenerife, Spain

28. Status of the theory prediction for $g-2$

Thomas Teubner (University of Liverpool)

26/09/2019, 09:30

There is a persisting discrepancy of more than three standard deviations between the experimental measurement and the Standard Model prediction of the anomalous magnetic moment of the muon. In this talk, the different contributions to the theory prediction of $g-2$ are reviewed, with main emphasis on the hadronic contributions, especially the hadronic vacuum polarisation corrections determined...

29. Status of the Muon $g-2$ Experiment at Fermilab

Kevin Labe (Cornell Univesity)

26/09/2019, 10:00

The magnetic moments of the charged leptons have long served as an important test of our models of fundamental particles. The well known tension in the anomalous magnetic moment of the muon observed in the E821 experiment at Brookhaven National Laboratory motivated the creation of the new Muon $g-2$ Experiment (E989), now taking place at Fermi National Accelerator Laboratory, which aims to...

30. Measurement of the fine structure constant as test of the standard model

Zachary Pagel (LBNL)

26/09/2019, 10:25

Measurements of the fine-structure constant are powerful tests of the consistency of theory and experiment across physics. We have measured the recoil frequency of cesium-133 atoms in an atom interferometer to measure $\hbar/M$, the ratio of the Planck constant and the mass of the atom, from which we derive the most accurate measurement of the fine-structure constant to date: $\alpha$ =...

31. Status of $g-2$ in lattice QCD

Thomas Blum (University of Connecticut & RIKEN BNL)

26/09/2019, 11:20

I will review the status of lattice calculations of the hadronic contributions to the muon anomalous magnetic moment, including vacuum polarization and light-by-light scattering.

32. Hadronic vacuum polarization contribution to the muon magnetic moment from lattice quantum chromodynamics

Laurent Lellouch (Centre National de la Recherche Scientifique (CNRS))

26/09/2019, 11:50

The experimental measurement of the anomalous contribution to the muon magnetic moment, $a_\mu=(g_\mu-2)/2$, has shown a persistent discrepancy of over 3 standard deviations with the standard model prediction since the early 2000s. At present theoretical and experimental uncertainties are close in size. However, a new experiment underway at Fermilab is aiming to reduce the uncertainty on the...

33. BES III inputs for $g-2$

Christoph Florian Redmer (University of Mainz)

26/09/2019, 12:15

The appearance of data-driven approaches to improve the Standard Model prediction of the anomalous magnetic moment of the muon $a_\mu$ has motivated the BESIII collaboration to embark on a dedicated experimental program. The high statistics data samples collected with the BESIII experiment in $e^+e^-$ collisions in the $\tau$-charm region are analyzed exploiting the initial state radiation...

54. Potential Search for True Muonium at LHCb

Jonathan Plews (University of Birmingham)

26/09/2019, 12:40

True muonium is the currently unobserved bound state of a muon and anti-muon. The potential of the LHCb experiment to make a discovery of the $1^3S_1$ state, which dominantly decays to $e^+e^-$, is discussed here. It is shown that a search for $\eta\rightarrow\gamma\mathcal{TM}$, $\mathcal{TM}\rightarrow e^+e^-$ can exceed a significance of 5 standard deviations with the expected luminosity...

34. Status and phenomenology of light BSM

Maxim Pospelov (Perimeter Institut & University of Victoria)

26/09/2019, 16:00

I give a short review of the low-energy extensions of the Standard Model (such as axions, dark photons, dark Higgses and sterile neutrinos), and present a short summary of existing bounds and theoretical challenges.

35. The MUonE Project

Massimo Passera (INFN Padova)

26/09/2019, 16:30

36. BSM for $g-2$, LFUV and CLFV

Paride Paradisi (Universita' di Padova and INFN)

26/09/2019, 16:55

37. Status of dispersive approach to HLbL

Igor Danilkin (University of Mainz)

26/09/2019, 17:50

In view of the current $3-4 \sigma$ deviation between theoretical and experimental values for the muon’s anomalous magnetic moment, I will review the ongoing efforts in constraining the hadronic light-by-light contribution to $(g-2)_\mu$ by using dispersive techniques.

38. Matching short-distance constraints to resonance exchange in the muon HLbL

Oscar Catà (University of Siegen)

26/09/2019, 18:15

The evaluation of the hadronic light-by-light contribution to the $(g-2)_{\mu}$ is hindered by our limited knowledge of nonperturbative physics. Different hadronic models have been introduced in the past to estimate its different contributions, where contact with QCD is achieved by fulfilling a varying number of short-distance constraints. It is not clear, however, which are the most relevant...

39. Pion-pole contribution to HLbL

Bai-Long Hoid (University of Bonn)

26/09/2019, 18:40

A model-independent dispersive framework for the evaluation of hadronic light-by-light (HLbL) scattering in the anomalous magnetic moment of the muon $(g-2)_\mu$ was recently developed. It is based on the general principles of analyticity, unitarity, and crossing symmetry to attribute the contributions to on-shell form factors and scattering amplitudes accessible from experiment, complementary...