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SUMMARY:Hemant Kumar Prajapati (IISER\, Bhopal) "Chiral $U(1)_{X}$ Gauge S
 ymmetries and Their Phenomenological Implications"
DTSTART:20260706T060000Z
DTEND:20260706T070000Z
DTSTAMP:20260715T072500Z
UID:indico-event-1309@indico.ibs.re.kr
DESCRIPTION:While the Standard Model is highly successful\, phenomena like
  dark matter and neutrino oscillations require new physics. A well-motivat
 ed remedy is extending the SM with an additional Abelian U(1)_X gauge symm
 etry. In this talk\, I present new chiral U(1)_X extensions of the SM and 
 explore their phenomenological implications across two distinct frameworks
 . First\, I discuss flavor-universal chiral models where anomaly cancella
 tion requires introducing three dark fermions\, providing a natural dark m
 atter. The Z′ gauge boson mediates interactions between the dark and vis
 ible sectors\, and we call this U(1)_X symmetry as the “Dark hypercharge
 ” symmetry. We analyze both heavy (M_{Z′} > M_Z) and light (M_{Z′} <
  M_Z) Z′ scenarios using collider\, CEνNS\, and EνES data. I will also
  discuss how U(1)_X gauge extension can explain the CDF-II W boson mass an
 omaly. Second\, I introduce flavor-specific chiral models that naturally 
 generate mixed vector-axial or pure axial-vector couplings for a light Z
 ′. Using representative benchmarks\, we demonstrate that this framework 
 successfully accommodates global fits to b → s observables while respect
 ing B and K meson mixing constraints. Finally\, we show how this framework
  realizes the necessary axial-vector couplings to explain the ATOMKI anoma
 ly while satisfying stringent low-energy and collider bounds.\n\nhttps://i
 ndico.ibs.re.kr/event/1309/
LOCATION:CTPU Seminar room (Theory Bldg\, 4F)
URL:https://indico.ibs.re.kr/event/1309/
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