Constraining models with vector-like fermions from FCNC in /K and /B physics
Abstract
In this work we update the constraints on tree level FCNC couplings in the framework of a theory with n isosinglet vector-like down quarks. In this context, we emphasize the sensitivity of the B→ J/ ψKSCP asymmetry to the presence of new vector-like down quarks. This CP asymmetry, together with the rare decays B→X s,dl l¯ and K→πν ν¯ are the best options to further constrain the FCNC tree level couplings or even to point out, in the near future, the possible presence of vector-like quarks in the low energy spectrum, as suggested by GUT theories or models of large extra dimensions at the TeV scale.
- Publication:
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Nuclear Physics B
- Pub Date:
- October 2001
- DOI:
- 10.1016/S0550-3213(01)00390-X
- arXiv:
- arXiv:hep-ph/0105306
- Bibcode:
- 2001NuPhB.613..285B
- Keywords:
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- High Energy Physics - Phenomenology
- E-Print:
- 29 pages 11 figures. Comments on the calculation of epsilon' added, references included, conclusions unchanged