[Theory-seminars] Theory Seminar Monday (remote) - Nora Salone

[Zheng-Yang Li]

Dear all,

On Monday, October 21st, 2024 at 9:00AM EDT, we will have a virtual seminar given by Nora Salone of Narodowe Centrum Badań Jądrowych, Warsaw on the Zoom for Government link:

https://jlab-org.zoomgov.com/j/1619802511?pwd=DoSPgrGaVJ5jsCg7chY0oQIf6MrILT.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 F224/225.

Please see below for the title and abstract.

Theory Seminar: October 21st, 9:00AM EDT (virtual)

Speaker: Nora Salone (NCBJ, Warsaw)

Title: Weak nonleptonic decays in relativistic χPT

Abstract: Nonleptonic hyperon transitions are studied in a relativistic framework of chiral perturbation theory (χPT). Previously, one-loop corrections to parity-violating and -conserving partial-wave amplitudes S and P have been computed in a nonrelativistic approach, focusing on the leading chiral logarithms [1]. This study concluded that a satisfying agreement with data and reasonable convergence is reachable for the S waves, but not for the P waves. In light of significant updates of asymmetry parameters on the experimental side (see [2] and references therein), we attempt a (re)calculation of one-loop corrections in relativistic χPT in the EOMS renormalization scheme [3, 4]. Following the suggestion of [5], the unknown low-energy constants are estimated using explicit resonances corresponding to the chiral order of the one-loop corrections. We present our results for the combined fit to S- and P-wave amplitudes, as well as the relative importance of the considered contributions, such as the role of resonances and decuplet baryons as intermediate states. To summarize, our goal is to provide an updated theoretical description of weak nonleptonic hyperon decays in χPT up to one-loop corrections, based on the most recent data and theoretical framework.

References
[1] E. Jenkins, Nucl. Phys. B 375 (1992), 561-581.
[2] Phys. Rev. D 105 (2022) 11, 116022.
[3] Phys. Rev. D 68 (2003), 056005.
[4] Front. Phys. 8 (2013), 328–348.
[5] Phys. Rev. D 59 (1999), 094025.

See you on Monday.

Best regards,
Joe, Zheng-Yang, and Gloria

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