Speaker: Takemichi Okui
Title: Monopole-Fermion Scattering and the Solution to the Semiton/Unitarity Puzzle
Room: 3024
Host: John Terning
Abstract: The talk will cover my recent work on the so-called semiton/unitarity puzzle in monopole-fermion scattering. Traditionally it was thought such scattering could lead to fractional particle numbers (hence "semitons"), but there are no such states in the Fock space of the theory (hence "unitarity" problem). I will discuss how this problem is solved in Polchinski's "fermion-rotor system", which is an accurate description of charged massless fermions scattering on a magnetic monopole core in the limit of zero gauge coupling.
User:
High-Energy Seminars
Time:
1:30pm - 3:00pm
Send Reminder:
Yes - 0 days 6 hour 0 minutes before start
Description:
Speaker: Rodolfo Capdevilla
Title: Road to Minimal WIMPs
Room: 3024
Host: John Terning
Abstract: Minimal Dark Matter (MDM) models extend the Standard Model (SM) by introducing an electroweak multiplet, whose neutral component $\chi_0$ serves as a dark matter (DM) candidate. The multiplet can be a doublet (Higgsino-like), triplet (Wino-like), and beyond. Direct Detection (DD) and Indirect Detection (ID) searches can probe significant portions of the parameter space in these models, particularly under the assumption that $\chi_0$ accounts for 100% of the DM in the universe (the thermal target). Collider searches aim to produce the charged members of the multiplet, $\chi^+$, which then decay into $\chi_0$ and a charged SM particle. These searches are more effective when $\chi_0$ accounts for a fraction of the DM in the universe, as this leads to a lower mass multiplet compared to the thermal target, increasing the production cross sections. This creates an interesting complementarity between DD, ID, and collider searches. In this talk, I discuss the role that present and future colliders can play in discovering MDM. Specifically, I show how a muon collider with just 3 TeV of energy can discover the elusive Higgsino-like state up to its thermal target using a Soft Track search. As the collider energy increases, larger multiplets become accessible. A 10 TeV muon collider could discover the Wino-like state up to its thermal target by searching for Disappearing Tracks (DT). Finally, DT searches at a 10 TeV muon collider can probe quintuplet masses up to 10% of the thermal target. These results indicate an interesting path ahead towards the discovery of the long standing minimal WIMP models.
User:
High-Energy Seminars
Time:
1:30pm - 3:00pm
Send Reminder:
Yes - 0 days 6 hour 0 minutes before start
Description:
Speaker: Anson Hook
Title:
Room: 3024
Host: John Terning
Abstract:
User:
High-Energy Seminars
Time:
1:30pm - 3:00pm
Send Reminder:
Yes - 0 days 6 hour 0 minutes before start
Description:
Speaker: Maximilian Ruhdorfer
Title:
Room: 3024
Host: John Terning
Abstract:
