[Theory-seminars] (Corrected): theory seminar today at 9am - (remote) - Archana Radhakrishnan

[Adam Freese]

Greetings everyone,

I apologize for the typo in the previous email giving 9pm EDT as the time for today's seminar, as well as for the botched formatting. Note that the seminar takes place at 9 am EDT. A corrected reminder is appended below.

Today, Monday, March 31th, 2025 at 9:00AM EDT, we will have a virtual seminar given by Archana Radhakrishnan of Tata Institute of Fundamental Research on the following Zoom link:

https://jlab-org.zoomgov.com/j/1614062845?pwd=ZJ2oGOHp0vj9ipvRgYrKzY0epX8vpQ.1

Although it’s not an in-person seminar, you can also join your colleagues for a remote streaming of the seminar in CEBAF Center F324-325.

Please see below for the title and abstract.

Theory Seminar: March 31th, 9am EDT (virtual)

Speaker: Archana Radhakrishnan (TIFR)

Title: Exotic Tbc Tetraquarks From Lattice QCD


Abstract: Research into doubly heavy tetraquarks has become highly relevant, especially with the recent discovery of the doubly charmed tetraquark Tcc. In this talk, we present a lattice investigation of S-wave [https://mcusercontent.com/1de9c43e6d5e45ff0ecd664cd/images/68bd07e5-38e3-b8e2-a61d-73c26bc128e5.png]  scattering within the isoscalar axial-vector and scalar channels. Both processes feature the flavor combination [https://mcusercontent.com/1de9c43e6d5e45ff0ecd664cd/images/42a20a7a-4df7-f155-28b9-2b5bdbafab8f.png] , which could potentially host tetraquarks.


Our calculations were conducted on four different Nf = 2+1 MILC gauge ensembles, each with varying lattice spacings and volumes. Utilizing the amplitude analysis method by Lüscher, we extracted the scattering amplitudes from the finite-volume spectra. We examine the light quark mass ([https://mcusercontent.com/1de9c43e6d5e45ff0ecd664cd/images/62748273-defd-1612-f99f-98f8554d25bc.png]) dependence of these amplitudes and extrapolate the amplitudes to the continuum. Our findings provide evidence for a bound state of the [https://mcusercontent.com/1de9c43e6d5e45ff0ecd664cd/images/42a20a7a-4df7-f155-28b9-2b5bdbafab8f.png]  tetraquark at the physical quark mass ([https://mcusercontent.com/1de9c43e6d5e45ff0ecd664cd/images/62748273-defd-1612-f99f-98f8554d25bc.png]) point within both the scalar and the axial-vector channels.

See you all today!

Kind regards,

Joe, Zheng-Yang, Gloria and Adam

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