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SUMMARY:Chiral U (1)X Gauge Symmetries and Their Phenomenological Implicat
 ions
DTSTART:20260623T070000Z
DTEND:20260623T083000Z
DTSTAMP:20260621T041000Z
UID:indico-event-419@indico.kias.re.kr
DESCRIPTION:Speakers: Hemant Kumar Prajapati\n\nTitle: Chiral U (1)X Gauge
  Symmetries and Their Phenomenological Implications\nSpeaker: Hemant Kumar
  Prajapati\nAbstract: \nWhile the Standard Model is highly successful\, p
 henomena like dark matter and neutrino oscillations require new physics. A
  well-motivated remedy is extending the SM with an additional Abelian $U(1
 )_X$ gauge symmetry.\n In this talk\, I present new chiral $U(1)_X$ exten
 sions of the SM and explore their phenomenological implications across two
  distinct frameworks. First\, I discuss flavor-universal chiral models whe
 re anomaly cancellation requires introducing three dark fermions\, providi
 ng a natural dark matter. The $Z'$ gauge boson mediates interactions betwe
 en the dark and visible sectors\, and we call this $U(1)_X$ symmetry as th
 e “Dark hypercharge” symmetry. We analyze both heavy ($M_{Z'} > M_Z$) 
 and light ($M_{Z'} < M_Z$) $Z'$ scenarios using collider\, CE$\\nu$NS\, an
 d E$\\nu$ES data. I will also discuss how $U(1)_X$ gauge extension can exp
 lain the CDF-II W boson mass anomaly. Second\, I introduce flavor-specific
  chiral models that naturally generate mixed vector-axial or pure axial-ve
 ctor couplings for a light $Z'$. Using representative benchmarks\, we demo
 nstrate that this framework successfully accommodates global fits to $b \\
 to s$ observables while respecting $B$ and $K$ meson mixing constraints. F
 inally\, we show how this framework realizes the necessary axial-vector co
 uplings to explain the ATOMKI anomaly while satisfying stringent low-energ
 y and collider bounds.\n\nhttps://indico.kias.re.kr/event/419/
LOCATION:Room 1423 (KIAS)
URL:https://indico.kias.re.kr/event/419/
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