[Theory-seminars] Theory Seminar Monday (remote) - Archana Radhakrishnan

[Zheng-Yang Li]

Dear all,

On 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, 9pm 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 on Monday.

Best regards,

Joe, Zheng-Yang, Gloria and Adam
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