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TZID:Europe/Rome
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DTSTART:20260329T010000
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DTSTART:20261025T010000
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DTSTART;TZID=Europe/Rome:20260730T110000
DTEND;TZID=Europe/Rome:20260730T133000
DTSTAMP:20260817T114219
CREATED:20260727T120147Z
LAST-MODIFIED:20260727T120147Z
UID:41186-1785409200-1785418200@w3.lnf.infn.it
SUMMARY:Novel constraints on the axion-up-charm axial coupling from $D^0$-meson decays: an in-depth analysis of the D0 -> pi pi a channel
DESCRIPTION:Speaker: Daniele Lombardo (Sapienza Roma Univ.) \nUp to now\, bounds on the axion-up-charm axial coupling\, kA\, come only from the baryonic decay Lambda_c -> p a and from D-anti D mixing\, which are both affected by large theoretical uncertainties. I will show a novel procedure to infer new constraints on this coupling from D0-meson decays with an axion in the final state. In particular\, I will discuss how to compute the differential decay width of the BSM process D0 -> pi pi a and to find a new constraint on  kA via a sensitivity study. In particular\, I will focus on the treatment of the form factors appearing in the hadronic matrix element associated with this transition\, which can be directly extracted from measurements concerning semi-leptonic four-body D+-meson decays. All these inputs also produce a Dalitz plot\, giving important information for future dedicated experimental searches. In conclusion\, I will discuss how further constraints on kA$ may be obtained from other complementary decay channels\, as for instance the D0 -> K+ K- a$ transition\, and from information coming from astrophysics\, such as e.g. the cooling of supernovae.
URL:/event/novel-constraints-on-the-axion-up-charm-axial-coupling-from-d0-meson-decays-an-in-depth-analysis-of-the-d0-pi-pi-a-channel/
LOCATION:Aula Seminari\, Via Enrico Fermi\, 40\, Frascati\, Roma\, 00044\, Italia
CATEGORIES:Seminari teorici
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