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Giuseppe Ruoso24/04/2025, 09:00Plenary talk
The axion was originally introduced in the 70s to explain the absence of CP-violating effects in quantum chromodynamics (QCD) through the Peccei-Quinn (PQ) mechanism. It is a pseudo-scalar boson whose mass and couplings to standard model particles are related to the energy scale where the so called Peccei and Quinn symmetry is broken. Several axion models have been proposed, with the common...
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Kaladi Babu24/04/2025, 09:35Plenary talk
Strong interactions can potentially violate Charge Parity (CP) symmetry, but experimentally there has been no evidence for it. The Peccei-Quinn (PQ) mechanism which assumes a global U(1) symmetry provides an elegant solution to this "strong CP problem", in terms of a light particle, the axion. However, global symmetries, such as the ones employed in the PQ mechanism, are not respected by...
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Dr Vasja Susič (Laboratori Nazionali di Frascati (LNF))24/04/2025, 09:57Plenary talk
We present an axion model based on the Pati-Salam group, where $\mathrm{SU}(3)_{f_R}$ (part of flavor symmetry) has also been gauged. The choice of field content ensures a careful interplay of the two symmetries, such that an accidental global $\mathrm{U}(1)$ Peccei-Quinn (PQ) symmetry emerges. The resulting axion is of high quality for the breaking scale in a certain range, and the model's...
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Prof. Yue Zhang24/04/2025, 10:45Plenary talk
The QCD axion does not need to be a perfect pseudoscalar for solving the strong CP problem. I will discuss a cosmological role of such imperfectness by solving the domain wall problem that prevails in post-inflationary axion models with discrete symmetry. Effective operators, where the Peccei-Quinn field linearly couples to Standard Model particles, can provide a dynamical solution to the...
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Francesco D'Eramo (University of Padua & INFN Padua)24/04/2025, 11:07Plenary talk
Axion-like particles (ALPs) are a common feature in many extensions of the Standard Model. However, their stability is not guaranteed by any symmetry, making the consideration of their lifetime crucial when investigating their cosmological consequences. In this talk, I will explore two distinct ALP mass regimes and their corresponding signatures. First, I will focus on sub-eV ALPs, presenting...
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Michele Tammaro24/04/2025, 11:29Plenary talk
A new set of experiments will deliver in the next few years unprecedented sensitivity to Lepton Flavor Violating (LFV) muon decays. Mu3e, proposed at PSI (Switzerland), will focus on observing $\mu\to 3e$ decays, with a projected target of $10^{15}$ muons decaying at rest, and excellent electron/positron track reconstruction. In this talk I will review the current and future statues of these...
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