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<div class="">Dear all,</div>
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<div class="">Tomorrow we will have a theory seminar, please see below for details:</div>
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<div class="">Bluejeans connection: <a href="https://bluejeans.com/801786278" class="">https://bluejeans.com/801786278</a></div>
<div class="">Date and time: Monday April 5, 2021, 1:00PM EDT</div>
<div class="">Speaker: Raquel Molina (University of Valencia)</div>
<div class="">Title: The observed dibaryon “d*(2380)” peak in n p -> pi- pi+ d</div>
<div class="">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.</div>
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<div class="">Kindly note that we have now started recording the seminars. The recording archives can be found here:</div>
<div class=""> <a href="https://www.jlab.org/theory/seminars/2021seminars" class="">https://www.jlab.org/theory/seminars/2021seminars</a></div>
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<div class="">See you all there!</div>
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<div class="">Best regards,</div>
<div class="">Astrid, Christos, Filippo</div>
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