- Jose Bernabeu (IFIC)
- Eberhard Widmann (Austrian Academy of Sciences (AT))
- Johann Marton (Austrian Academy of Sciences (AT))
- Claude Amsler (Austrian Academy of Sciences (AT))
- Antonio Di Domenico (Sapienza Universita e INFN, Roma I (IT))
- Jeanette Miriam Lorenz (Ludwig Maximilians Universitat (DE))
- Niki Saoulidou (National and Kapodistrian University of Athens (GR))
- Vasiliki Mitsou (Univ. of Valencia and CSIC (ES))
- Margarida Nesbitt Rebelo (Instituto Superior Tecnico (IST))
- Margarida Nesbitt Rebelo Da Silva (Universidade de Lisboa (PT))
- Gustavo Branco (Instituto Superior Tecnico)
Compact binary mergers are cosmic laboratory for fundamental physics.
All four fundamental interactions play a key role in setting the properties of the
observables associated with these powerful stellar collisions. Thus, they need to
be taken into account to provide reliable multimessenger predictions. In this talk,
I will present the results obtained by the Ligo-Virgo collaborations for...
Since several decades people search for the electric dipole moment (EDM) of the neutron, an unambiguous manifestation of parity (P) and time reversal symmetry (T) violation. Assuming the conservation of CPT, T violation in a fundamental system also means CP violation. This has only been observed in very few systems in the Standard Model of particle physics (SM) as a tiny effect. However, it...
Electron EDM tests at ACME.
October 2018 the European Strategy Update study for the particle
physics program has been launched. This study will evaluate the options and
priorities of proposed particle physics facilities for the next five
years and beyond.
This presentation will report on the planned steps and milestons of the
European Strategy Update study, and describe some of the proposed key
projects that are being...
CPT symmetry demands that the spectrum of antihydrogen be identical to that of its ordinary matter counterpart. Performing laser spectroscopy on antihydrogen atoms and comparing to the hydrogen spectrum therefore allows for unique and very precise tests of this fundamental symmetry. The most precise such comparison so far is of the 1S-2S transition, which has been recently measured in...
Observation Atomic Parity Violation (APV) in atoms was crucial for the acceptance of the Standard Model as a general theory in physics. So far APV has been determined most precisely in Cs atoms. This measurement provides for a precise value of the weak mixing (Weinberg) angle at the lowest accessible energies with sub % accuracy. A significant deviation of this number from predictions based on...
The astrophysical neutrinos recently discovered by IceCube have the highest detected neutrino energies --- from TeV to PeV --- and travel the longest distances --- up to a few Gpc, the size of the observable Universe. These features make them naturally attractive probes of fundamental particle-physics properties, possibly tiny in size, at energy scales unreachable by any other means. The...
The measurement of a relatively large theta13 angle has opened the possibility to study CP violation phenomena in the leptonic sector, related to the phase delta of the PMNS neutrino mixing matrix.
Today, the current generation of long baseline experiments with T2K and Nova has started probing this sector, with interesting first indications that will be followed by more precise measurements...
A viable minimal model with spontaneous CP violation in the framework of a Two Higgs Doublet Model is introduced. The model is based on a generalised Branco-Grimus-Lavoura model with a flavoured $Z_2$ symmetry, under which two of the quark families are even and the third one is odd. The lagrangian respects CP invariance, while the vacuum has a CP violating phase, which is able to generate a...
The EW vacuum, the state where our universe has settled, is a metastable state (false vacuum), and if only Standard Model interactions are considered, its lifetime turns out to be much larger than the age of the universe. It is well known, however, that the EW vacuum lifetime is extremely sensitive to unknown (but necessarily present) high enery new physics: the latter can enormously lower the...
Positronium is the lightest purely leptonic object decaying into photons. As an atom bound by a central potential, it is a parity eigenstate, and as an atom built out of an electron and an anti-electron, it is an eigenstate of the charge conjugation operator. Therefore, the positronium is a unique laboratory to study discrete symmetries whose precision is limited, in principle, only by the...
In this talk I will review the theoretical status of the NP interpretations of the recent hints of Lepton Flavor Universality Violation in semileptonic B decays. The interplay with other observables will also be discussed.
The LHC results have set the stage for the discussion of future high-energy physics facilities. The Higgs boson discovery, with the need of precise measurements of its properties, and the current absence of experimental evidence of new physics open a discussion on the best ways to move forward. I will summarise recent sensitivity studies for the HL-LHC physics programme and compare it with the...
A selection of the most recent results of Higgs boson physics from the ATLAS and CMS Collaborations using the LHC Run 2 data will be reported. The measurements of properties of the Higgs boson in the Standard Model analyses will be presented and an overview of the beyond Standard Model Higgs boson searches will be given.
This is a place holder abstract for the supersymmetry talk of Dr John Ellis.
Twin Higgs (TH) models explain the lack of discovery of new colored particles responsible for natural electroweak symmetry breaking. A new type of supersymmetric Twin Higgs model is presented in which the TH mechanism is introduced by an extra gauge symmetry. This class of models feature natural electroweak symmetry breaking for squarks and gluino heavier than 2 TeV. The new gauge interaction...
In this talk, I will describe the current status of global analyses of neutrino oscillation data in the three-flavour framework, focusing on the current knowledge of the oscillation parameters as well as on the improvements that can be expected in the near future. The recent hints pointing towards a preferred value for the leptonic CP phase and a preferred ordering for the neutrino spectrum...
The field of PT-symmetric quantum mechanics began with a study of the
Hamiltonian $H=p^2+x^2(ix)^\epsilon$. A surprising feature of this non-Hermitian
Hamiltonian is that its eigenvalues are discrete, real, and positive when $\epsilon\geq0$. This talk examines the corresponding quantum-field-theoretic
Hamiltonian $H=\half(\partial\phi)^2+\half\phi^2(i\phi)^\epsilon$ in
Generically the only time-independent solutions to open electromagnetic problems are scattering states, consisting of an input wave and a scattered wave, which typically contains flux in all physically accessible channels. If restrictions are placed on which scattering channels may contain outgoing flux, in general no solutions exist. However, in certain circumstances such solutions may...
The MiniBooNE collaboration recently reported results that support the existence of sterile neutrinos in nature. In the talk I will discuss the incorporation of sterile neutrinos in string derived models. While large volume string-brane scenarios may naturally accommodate sterile neutrinos, they are much harder to reconcile with the high scale heterotic-string GUT models. I will argue that...
We present recent developments in F-theory compactifications. We focus on advances in constructions of globally consistent F-theory compactifications with continuous and discrete gauge symmetries and emphasize new insights into global constraints on allowed matter representations. We highlight the first example of the three family Standard Model with Z2 matter parity and a subsequent...