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Gilberto Colangelo (Berna University)15/02/2023, 09:00
I will review the dispersive and data-driven calculations of the hadronic contributions to the Muon g-2, with emphasis on the hadronic vacuum polarization. I will discuss in detail the comparison with the lattice evaluation both of the total and of the intermediate window quantity, and the implications of the present discrepancy. I will conclude with an outlook on future developments.
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On Kim15/02/2023, 09:30
The Muon 𝑔−2 experiment at Fermilab aims to measure the magnetic anomaly of muon to 140 parts-per-billion precision, which is about four times more precise than the predecessor experiment at Brookhaven National Laboratory. To that end, the experiment not only requires the accumulation of 21 times more of the detected positrons but a much better understanding and, thus, reduction of the...
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Christoph Lehner (Brookhaven National Laboratory)15/02/2023, 11:10Oral presentation
I will give an overview of the RBC/UKQCD g-2 program including both the hadronic light-by-light as well as the hadronic vacuum polarization contribution.
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Peter Winter (Argonne National Laboratory)15/02/2023, 11:40
The Muon g-2 Experiment at Fermi National Accelerator Laboratory was designed to measure the anomalous magnetic moment of the muon, $𝑎_𝜇$, with a target precision of 140 parts-per-billion (ppb); a four-fold improvement over the former measurement at Brookhaven National Laboratory. The experiment was motivated by the ~3.5 standard deviation between the BNL result and the Standard Model...
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Graziano Venanzoni (Istituto Nazionale di Fisica Nucleare)15/02/2023, 14:10
During the last 15 years the "Radio MontecarLow (“Radiative Corrections and Monte Carlo Generators for Low Energies”) Working Group, see www.lnf.infn.it/wg/sighad/, has been providing valuable support to the development of radiative corrections and Monte Carlo generators for low energy $e^+e^-$ data and tau-lepton decays. Its operation which started in 2006 proceeded until the last few years...
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Francesco Sanfilippo (Istituto Nazionale di Fisica Nucleare)15/02/2023, 14:30Oral presentation
In this talk I will review the calculation of the short and intermediate window for g-2, based on our recent simulations performed int the Twisted Mass regularization of QCD, with physical pion mass and three different lattice spacings. Our results highlights that the tension with experimental measurement is concentrated in the intermediate energy region.
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Giovanni Abbiendi (Istituto Nazionale di Fisica Nucleare)15/02/2023, 15:00
The muon anomalous magnetic moment is currently one of the most intriguing measurements, as it marks a 4.2 𝜎 deviation from the reference prediction of the Standard Model, and is expected to provide an even more stringent test in the next few years with the experimental error reducing by a factor of four. In parallel the theoretical error need to be reduced. It is dominated by the...
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Matteo Sorbara (Università degli Studi di Roma Tor Vergata & INFN Sezione Roma Tor Vergata)15/02/2023, 16:40
The muon anomaly, $𝑎_𝜇=\frac{(𝑔−2)}{2}$, is a low-energy observable which can be both measured and computed to high precision, making it a sensitive test of the Standard Model and a probe for new physics. The current discrepancy between the Standard Model calculation from the Muon $𝑔−2$ Theory Initiative [T. Aoyama et al. - Phys. Rept. 887 (2020), 1-166] and the experimental value is...
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Kalman Szabo (University of Wuppertal)15/02/2023, 17:10
We present our previous and ongoing lattice QCD efforts to determine thehadron vacuum polarization contribution to the muon magnetic moment.
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Anna Driutti15/02/2023, 17:40
The main goal of the Fermilab Muon g-2 experiment is to determine the muon anomalous magnetic moment ($a_\mu$) to a 140 parts per billion (ppb) uncertainty, to compare it with the Standard Model prediction. The value of a_\mu is determined by measuring two quantities: the anomalous spin precession frequency of positive muons circulating in a storage ring and the magnetic field experienced by...
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Damir BECIREVIC (LPT, Université Paris Sud and CNRS)16/02/2023, 08:30
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Giulia Tuci (PI)16/02/2023, 09:00
The LHCb detector at the Large Hadron Collider is dedicated to the study of heavy-flavoured hadrons. Using large data samples accumulated during the first two runs of the LHC, the LHCb collaboration has performed various measurements providing a sensitive test of the Standard Model and strengthening our knowledge of flavour physics, QCD and electroweak processes. Selected recent results are...
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Alejandro Vaquero (Universidad de Zaragoza)16/02/2023, 10:50
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Guido Martinelli (ROMA1)16/02/2023, 11:20
The Standard Model of particle physics leaves many fundamental questions unanswered, among which, for example, neutrino masses, matter-antimatter asymmetry and the nature of dark matter. Flavour physics (the intensity frontier) is one of the main fields of investigation to unveil the unsolved questions.
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Several aspects of flavour physics, including the recent experimental ``anomalies” in... -
Giuseppe Gagliardi (Istituto Nazionale di Fisica Nucleare)16/02/2023, 11:50
We discuss a novel approach, based on spectral reconstruction techniques, which circumvents the well-known problem of the analytic continuation from Minkowskian to Euclidean time for hadronic processes above kinematical thresholds. The approach is discussed for the specific case of the radiative decays of pseudoscalar mesons $P\to \ell \nu_{\ell} \gamma^{}$, where $\gamma^{}$ is a virtual...
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Luigi Del Debbio (University of Edinburgh)16/02/2023, 14:20
As the number of fermion fields is increased, gauge theories are expected to undergo a transition from a QCD-like phase, characterised by confinement and chiral symmetry breaking, to a conformal phase, where the theory becomes scale-invariant at large distances. In this paper, we discuss some properties of a third phase, where spontaneously broken conformal symmetry is characterised by its...
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Giancarlo Rossi (University of Roma Tor Vergata, INFN Roma2 and Centro Fermi)16/02/2023, 14:50
We discuss how a recently discovered non-perturbative field-theoretical mechanism giving mass to elementary fermions can be extended to generate a mass for the electro-weak bosons, when weak interactions are introduced, and can thus be used as a viable alternative to the Higgs scenario. We will show that this new scheme, successfully tested in extensive lattice simulations, offers a solution...
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Michael De Nuccio17/02/2023, 09:10
Axions and Axion-Like Particles (ALPs) are hypothetical particles that could help solve the strong QCD problem and/or act as dark matter or dark portals. B factories are high-precision experiments specialized in B physics, but also exceptionally capable of probing the dark matter MeV-to-GeV range. In this talk, I will report on the status and the recent results of searches for axions and ALPs...
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Luca Di Luzio17/02/2023, 09:40
Four decades after its prediction the axion remains the most compelling solution to the strong CP problem and a well motivated dark matter candidate, inspiring several ultrasensitive experiments based on axion-photon mixing. After reviewing the axion solution to the strong CP problem, I will focus on recent developments in axion model building suggesting that the QCD axion parameter space is...
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Giovanni Villadoro17/02/2023, 10:40
I will overview the interplay between QCD axion properties and Lattice QCD inputs and discuss open questions in axion phenomenology and cosmology.
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Maria Paola Lombardo17/02/2023, 11:10
Ab-initio results from QCD topological susceptibility as a function of temperature constrain the freeze-out of the QCD axion, and in turn limit the available parameter space of today's axion coupling and mass. The talk reviews the status of lattice studies, with emphaysis on extrapolation to the relevant temperarure range. Issues related with the continuum limit of lattice results with...
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Gianluca Lamanna (Istituto Nazionale di Fisica Nucleare)17/02/2023, 11:40
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Monica Verducci (Istituto Nazionale di Fisica Nucleare)17/02/2023, 14:00
High-statistics measurements in peripheral photon-induced scattering using relativistic heavy-ion beams provide a precise and unique opportunity to investigate extensions of the Standard Model. New measurements of exclusive dilepton production (electron, muon, and tau pairs) are discussed. In particular, the tau-pair production measurement is used to constrain tau lepton's anomalous magnetic...
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Alessandro Podo17/02/2023, 14:30
The axion solution to the strong CP problem is known to be sensitive to Planck scale effects, that give rise to the axion quality problem. We study a class of chiral gauge theories with a confining vector-like SU(N) factor and a weakly interacting chiral U(1) in which the Peccei-Quinn (PQ) symmetry is accidental and the axion arises as a composite Nambu-Goldstone boson. We clarify the...
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