Quark flavour mixing with right-handed currents: an effective theory approach
Jul, 2010
39 pages
Published in:
- Nucl.Phys.B 843 (2011) 107-142
e-Print:
- 1007.1993 [hep-ph]
Report number:
- TUM-HEP-765-10
View in:
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Abstract: (Elsevier)
The impact of right-handed currents in both charged- and neutral-current flavour-violating processes is analysed by means of an effective theory approach. More explicitly, we analyse the structure of dimension-six operators assuming a left–right symmetric flavour group, commuting with an underlying SU ( 2 ) L × S U ( 2 ) R × U ( 1 ) B − L global symmetry, broken only by two Yukawa couplings. The model contains a new unitary matrix controlling flavour-mixing in the right-handed sector. We determine the structure of this matrix by charged-current data, where the tension between inclusive and exclusive determinations of | V u b | can be solved. Having determined the size and the flavour structure of right-handed currents, we investigate how they would manifest themselves in neutral current processes, including particle–antiparticle mixing, Z → b b ¯ , B s , d → μ + μ − , B → { X s , K , K ⁎ } ν ν ¯ , and K → π ν ν ¯ decays. The possibility to explain a non-standard CP-violating phase in B s mixing in this context, and the comparison with other predictive new-physics frameworks addressing the same problem, is also discussed. While a large S ψ ϕ asymmetry can easily be accommodated, we point out a tension in this framework between | V u b | and S ψ K .Note:
- 39 pages, 3 figs
- flavor: mixing
- particle antiparticle: mixing
- quark: flavor
- coupling: Yukawa
- current: right-handed
- flavor: violation
- symmetry: left-right
- neutral current
- charged current
- new physics
References(65)
Figures(3)