[Theory-seminars] Theory seminar: Monday April 5th at 1:00PM

[Christos Kallidonis]

Dear all,

Tomorrow we will have a theory seminar, please see below for details:

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Bluejeans connection: https://bluejeans.com/801786278
Date and time: Monday April 5, 2021, 1:00PM EDT
Speaker: Raquel Molina (University of Valencia)
Title: The observed dibaryon “d*(2380)” peak in n p -> pi- pi+ d
Abstract: We study the two step sequential one pion production mechanism, np(I = 0) -> pi- pp, followed by the fusion reaction pp -> pi+ d, in order to describe the np -> pi+ pi- d reaction with pi+ pi- in I = 0, where a narrow peak, so far identified with a “d*(2380)” dibaryon, has been observed. We find that the second step pp -> pi+ d is driven by a triangle singularity that determines the position of the peak of the reaction and the large strength of the cross section. The combined cross section of these two mechanisms produces a narrow peak with the position, width and strength compatible with the experimental observation within the approximations done. This novel interpretation of the peak without invoking a dibaryon explains why the peak is not observed in other reactions where it has been searched for.
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Kindly note that we have now started recording the seminars. The recording archives can be found here:
         https://www.jlab.org/theory/seminars/2021seminars


See you all there!

Best regards,
Astrid, Christos, Filippo
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