TY - JOUR
T1 - Quark flavour mixing with right-handed currents
T2 - An effective theory approach
AU - Buras, Andrzej J.
AU - Gemmler, Katrin
AU - Isidori, Gino
N1 - Funding Information:
We thank Wolfgang Altmannshofer, Paolo Gambino and Tillmann Heidsieck for useful comments and discussions. G.I. would like to thank Jernej Kamenik and Martin Gonzalez-Alonso for useful discussions in the early stage of this work. We all thank the Galileo Galilei Institute for Theoretical Physics for the hospitality and partial support during the completion of this work. This research was partially supported by the Cluster of Excellence ‘Origin and Structure of the Universe’, by the Graduiertenkolleg GRK 1054 of DFG , by the German ‘Bundesministerium für Bildung und Forschung’ under contract 05H09WOE , and by the EU Marie Curie Research Training Network contract MTRN-CT-2006-035482 (Flavianet).
PY - 2011/2/1
Y1 - 2011/2/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=78049459247&partnerID=8YFLogxK
U2 - 10.1016/j.nuclphysb.2010.09.021
DO - 10.1016/j.nuclphysb.2010.09.021
M3 - Article
AN - SCOPUS:78049459247
SN - 0550-3213
VL - 843
SP - 107
EP - 142
JO - Nuclear Physics, Section B
JF - Nuclear Physics, Section B
IS - 1
ER -