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SUMMARY:Patrick Bolton: Displaced Signals from Long-lived Particles in Neu
 trinoless Double Beta Decay
DTSTART:20260924T090000Z
DTEND:20260924T100000Z
DTSTAMP:20261004T205300Z
UID:indico-event-4059@indico.ijs.si
DESCRIPTION:Neutrinoless double beta (0νββ) decay is one of the most po
 werful tools for probing physics beyond the Standard Model\, most notably 
 the Majorana nature of neutrinos. Extensions of this framework involving l
 ight new physics mediators\, such as Majoron-like bosons\, have traditiona
 lly been searched for through their contribution to missing energy\, treat
 ing the new particle as invisible. In this talk\, I will present a complem
 entary and largely unexplored scenario: one in which the Majoron-like part
 icle is produced on-shell during 0νββ decay but is massive and long-liv
 ed enough to travel a macroscopic distance before decaying into visible fi
 nal states. I will discuss the resulting displaced energy depositions from
  decays into photon pairs\, a photon plus a dark photon\, and electron-pos
 itron pairs\, and show how these signatures distort the expected visible e
 nergy spectra in characteristic\, distance-dependent ways. These displaced
 -decay topologies offer novel experimental handles at current and next-gen
 eration 0νββ decay experiments\, with the potential to improve sensitiv
 ity to Majoron couplings by more than two orders of magnitude relative to 
 standard invisible Majoron searches. I will also comment on how the effect
 ive interactions responsible for this phenomenology can arise naturally in
  well-motivated UV completions that are otherwise inaccessible to conventi
 onal 0νββ decay searches\, underscoring the value of displaced-vertex s
 ignatures as a new probe of neutrino mass generation mechanisms.\n\nhttps:
 //indico.ijs.si/event/4059/
LOCATION:A/1-106 - Seminarska soba fizike (F5) (Jamova)
URL:https://indico.ijs.si/event/4059/
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