[Theory-seminars] Cake Seminar Tomorrow - JSA/HUGS Fellowship Recipients

[Caroline Silva Rocha Costa]

Dear All,


Tomorrow, June 21st at 1pm EDT, we will have a cake seminar given by the JSA/HUGS fellowship recipients: Lucal Froguel (IFT-Unesp), María Guadalupe Morales Trejo (Universidad Michoacana de San Nicolás de Hidalgo) and Johan Colorado Caicedo (CINVESTAV-IPN). The seminars will be shorter than usual, each lasting around 15min. Please, join us in CEBAF Center room F224-225 and welcome the fellowship recipients, who will be with us at the Lab for the next 2 weeks.


Please see below for the title and abstracts.



Cake Seminar

Wednesday, June 21st at 1:00 PM



Lucal Froguel (IFT-Unesp)

Will discuss “An Application of Quantum Computing to QCD”



Abstract:

Quantum computers hold the promise to overcome the limitation of classical computers and simulate bigger quantum systems, as suggested by Feynman. On the other hand, QCD is a non-perturbative theory which is still not fully understood, despite its importance. In this seminar, I will speak about our efforts in simulating a quarkonium pair that interacts via an effective potential, derived from Effective Field Theory, using quantum computers. I will discuss the approximations we make, the current limitations and how we can improve our simulations.

María Guadalupe Morales Trejo (Universidad Michoacana de San Nicolás de Hidalgo)
Will discuss "Constructing a non-perturbative fermion-photon interaction"


Abstract:

We construct the non-perturbative fermion-photon vertex invoking constraints of gauge covariance. Thanks to the work of Ball and Chiu, it is known that the fermion-photon vertex is the sum of two components, longitudinal and transverse to the photon momentum. The longitudinal part is determined by the well-known Ward-Takahashi identity (WTI). We employ Transverse Takahashi Identities (TTI) to construct the transverse part of the fermion-photon vertex which remains unconstrained by the usual WTI. The related gap equation is studied in the massless limit using the quenched approximation to further constrain the transverse vertex and guarantee the multiplicative renormalizability of the fermion propagator. This work is relevant and important to implement gauge-invariance in the study of Schwinger-Dyson equations (SDEs).


Johan Colorado Caicedo (CINVESTAV-IPN)

Will discuss “Exploring invisible particles: In a search of “Beyond Standard Model” in $\tau$ decay”



Abstract:

This presentation introduces a novel two-dimensional method designed for the investigation of semi-invisible decays, with a specific focus on the $\tau \to l \alpha$ process within the Belle II experiment, where $l$ denotes an electron or a muon, and $\alpha$ represents an invisible boson. By utilizing comprehensive kinematic information, this method enhances the sensitivity to semi-invisible decays, with the ultimate goal of exploring physics beyond the Standard Model (BSM).
The study, currently in its preliminary stage, involves the initial approximation through official Monte Carlo simulation data. Remarkably, the application of this method in the Belle II experiment has resulted in significant improvements to the upper limits on the branching fraction ratio $Br(\tau \to l \alpha)/Br(\tau \to l \nu \overline{\nu})$. This accomplishment could represent a substantial advancement in our understanding of semi-invisible decays and could establish a promising platform for future research endeavors in this exciting field.




See you tomorrow!

Caroline, Joe & Patrick

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