Axions, neutrinos, and Higgs-like resonances, a fuzzy combination

Rojas, Eduardo Y Benavides, Richard H. Y Giraldo, Yithsbey (2025) Axions, neutrinos, and Higgs-like resonances, a fuzzy combination. In: 5th Colombian Meeting on Flavor Physics, 10/12/25, Tolima. Colombia.

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Resumen

In the limit where the SM fermions are massless the QCD Lagrangian has the symmetry U(N)V x U(N)A, for the first family N = 2. U(2)V = SU(2)V x U(1)V = SU(2)I (isospin symmetry) x U(1)B (baryon number conservation). In the limit where the SM fermions are massless the QCD Lagrangian has the symmetry U(N)V x U(N)A, for the first family N = 2. U(2)V = SU(2)V x U(1)V = SU(2)I (isospin symmetry) x U(1)B (baryon number conservation). The global U(2)A = SU(2)A x U(1)A symmetry is broken spontaneously by the quark condensate, thus one expects 4 Nambu–Goldstone bosons (pi0, pi-, pi+, eta), but eta is too heavy. Although pions are light, there is no clue of another light state in the hadronic spectrum. Weinberg dubbed this the U(1)A problem, suggesting that somehow there was no U(1)A symmetry in QCD.

Tipo de Elemento:	Conferencia o Taller artículo (Speech)
Palabras Clave:	decaimientos raros de mesones, física de sabor, procesos K+ → pi+ nu nu, desintegraciones del mesón B, búsqueda de familones, neutrinos en decaimientos hadrónicos, experimentos Belle, física más allá del Modelo Estándar, razones de branching.
Asunto:	Q Ciencias > Q Science (General) Q Ciencias > QC Physics
Division:	Facultad de Ciencias Exactas y Naturales > Programa de Física > Eventos
Depósito de Usuario:	Prof. Eduardo Rojas
Fecha Deposito:	06 Mar 2026 19:54
Ultima Modificación:	06 Mar 2026 19:54
URI:	http://sired.udenar.edu.co/id/eprint/17722

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