[Theory-seminars] Theory seminar next Monday: Raquel Molina

[Astrid Hiller Blin]

Dear all,

Next Monday, Raquel Molina will be giving a seminar, see the details below.
Bluejeans connection: https://bluejeans.com/801786278
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*Theory seminar*
Monday, April 5th, 1:00 PM

*Raquel Molina* (University of Valencia) will talk about "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.

We look forward to seeing you at the seminar!
Astrid, Christos, Filippo
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