Fixing the number of non-sequential generations within the SU (2) L - U (1) y gauge group

Elmer Ramirez Barreto, David Romero Abad

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Abstract

In this work, we explore the possibility of fixing the number of new non-sequential chiral-type generations of fermions that could be added to the Standard Model by combining the condition that arise from the anomaly cancellation with the restriction in the number of flavors imposed by the QCD asymptotic freedom. We found that the maximum number of new generations is four, and this allows us, at the same time, to place limits for the electrical charges of quarks and leptons within an SM-like framework. Our result is compatible with the constraints involving new generations and their contributions to the oblique parameters S and T.

Original languageEnglish
Article number1950292
JournalModern Physics Letters A
Volume34
Issue number35
DOIs
StatePublished - 20 Nov 2019

Keywords

  • Gauge anomaly cancellation
  • new fermions
  • QCD asymptotic freedom

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