Speaker: T. Daniel Brennan
Title: The Callan Rubakov Effect
Room: 3024
Host: John Terning
Abstract: The Callan Rubakov Effect describes the interaction between (massless) fermions and a smooth monopole in 4d gauge theory. In this scenario, the fermions can probe the UV physics inside the monopole core which leads to interesting effects such as proton decay in GUT models. However, the monopole-fermion scattering appears to lead to out-states that are not in the perturbative Hilbert space. In this talk, we will review this issue and propose a new physical mechanism that may resolve this long-standing confusion.
Description:
Veterans Day
User:
High-Energy Seminars
Time:
1:30pm - 3:00pm
Send Reminder:
Yes - 0 days 6 hour 0 minutes before start
Description:
Holiday
User:
High-Energy Seminars
Time:
4:00pm - 5:00pm
Location:
PHY 285
Send Reminder:
Yes - 20241110
Description:
Speaker: Julia Gonski
Title: AI/ML Across the Data Pipeline: Designing 'New' New Physics Searches at the Energy Frontier
Abstract: The coincidence of rapid technological developments in both machine learning (ML) and microelectronics have opened the door to increased intelligence in modern physics experiments, from the “edge” at-source to offline analysis. Such capability is driven by the need for new fundamental physics and can be naturally incorporated into the data pipelines of energy frontier collider experiments. In this talk I will describe novel applications of ML to collider data acquisition and analysis, starting with searches for beyond the Standard Model physics, trigger applications, and finally to processing on the detector. The future of this work is discussed in the context of planning for next-generation international collider facilities and the long-term outlook for discovery.
Speaker: Zacharia Chacko
Title: General Form of Effective Operators from Hidden Sectors
Room: 3024
Host: John Terning
Abstract: I discuss a model-independent analysis of the dimension-six terms that are generated in the low energy effective theory when a hidden sector that communicates with the Standard Model through a specific portal operator is integrated out. I work within the Standard Model Effective Field Theory (SMEFT) framework and consider the Higgs, neutrino, and hypercharge portals. I show that, for each portal, the forms of the leading dimension-six terms in the low-energy effective theory are fixed and independent of the dynamics in the hidden sector. For the Higgs portal, two independent dimension-six terms are generated, one of which has a sign that, under certain conditions, is fixed by the requirement that the dynamics in the hidden sector be causal and unitary. In the case of the neutrino portal, for a single generation of SM fermions and assuming that the hidden sector does not violate lepton number, a unique dimension-six term is generated, which corresponds to a specific linear combination of operators in the Warsaw basis. For the hypercharge portal, a unique dimension-six term is generated, which again corresponds to a specific linear combination of operators in the Warsaw basis. For both the neutrino and hypercharge portals, under certain conditions, the signs of these terms are fixed by the requirement that the hidden sector be causal and unitary. I perform a global fit of these dimension-six terms to electroweak precision observables, Higgs measurements, and diboson production data and determine the current bounds on their coefficients.
User:
High-Energy Seminars
Time:
1:30pm - 3:00pm
Send Reminder:
Yes - 0 days 6 hour 0 minutes before start
Description:
Speaker: Spencer Chang
Title: General Amplitudes for Beyond the Standard Model Physics
Room: 3024
Host: John Terning
Abstract:
At the LHC and future colliders, in addition to searching for specific
theories, it is crucial to search for new physics model-independently.
In this talk, I will describe how to determine the most general
on-shell scattering interactions involving Standard Model particles
which are SU(3)_c x U(1)_em invariant. By a combination of the
Hilbert series and numerical computations, we have completely
determined the structure for three and four point interactions. One
can then use this classification of the interactions to perform a
systematic search for new physics. As applications, I will discuss
how these enable i) searches for general lepton number violating
decays for the muon and tau and ii) effective field theory searches,
taking into account higher order uncertainties.
Election Day