Quark flavour mixing with right-handed currents: An effective theory approach

Andrzej J. Buras, Katrin Gemmler, Gino Isidori

Research output: Contribution to journalArticlepeer-review

86 Scopus citations


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×SU(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 |Vub| 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→bb̄, Bs,d→μ+μ-, B→{Xs,K,K*}νν̄, and K→πνν̄ decays. The possibility to explain a non-standard CP-violating phase in Bs mixing in this context, and the comparison with other predictive new-physics frameworks addressing the same problem, is also discussed. While a large Sψφ asymmetry can easily be accommodated, we point out a tension in this framework between |Vub| and SψK.

Original languageEnglish
Pages (from-to)107-142
Number of pages36
JournalNuclear Physics, Section B
Issue number1
StatePublished - 1 Feb 2011


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