Anatomy of new physics in B-B mixing
- Institut fuer Physik, Technische Universitaet Dortmund, D-44221 Dortmund (Germany)
- Institut fuer Theoretische Teilchenphysik, Universitaet Karlsruhe, Karlsruhe Institute of Technology, D-76128 Karlsruhe (Germany)
- Centre de Physique Theorique, Campus de Luminy, Case 907, F-13288 Marseille Cedex 9 (France)
- France
- Laboratoire de Physique Theorique d'Orsay, UMR8627, CNRS/Universite Paris-Sud 11, 91405 Orsay Cedex (France)
- Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut), Foehringer Ring 6, 80805 Muenchen (Germany)
- Laboratoire d'Annecy-Le-Vieux de Physique des Particules, 9 Chemin de Bellevue, BP 110, F-74941 Annecy-le-Vieux Cedex, France (UMR 5814 du CNRS-IN2P3 associee a l'Universite de Savoie) (France)
- Humboldt-Universitaet zu Berlin, Institut fuer Physik, Newtonstr. 15, D-12489 Berlin (Germany)
- Laboratoire de Physique Corpusculaire de Clermont-Ferrand, Universite Blaise Pascal, 24 Avenue des Landais F-63177 Aubiere Cedex (France)
We analyze three different new physics scenarios for {Delta}F=2 flavor-changing neutral currents in the quark sector in the light of recent data on neutral-meson mixing. We parametrize generic new physics contributions to B{sub q}-B{sub q} mixing, q=d, s, in terms of one complex quantity {Delta}{sub q}, while three parameters {Delta}{sub K}{sup tt}, {Delta}{sub K}{sup ct}, and {Delta}{sub K}{sup cc} are needed to describe K-K mixing. In scenario I, we consider uncorrelated new physics contributions in the B{sub d}, B{sub s}, and K sectors. In this scenario, it is only possible to constrain the parameters {Delta}{sub d} and {Delta}{sub s} whereas there are no nontrivial constraints on the kaon parameters. In scenario II, we study the case of minimal flavor violation (MFV) and small bottom Yukawa coupling, where {Delta}{identical_to}{Delta}{sub d}={Delta}{sub s}={Delta}{sub K}{sup tt}. We show that {Delta} must then be real, so that no new CP phases can be accommodated, and express the remaining parameters {Delta}{sub K}{sup cc} and {Delta}{sub K}{sup ct} in terms of {Delta} in this scenario. Scenario III is the generic MFV case with large bottom Yukawa couplings. In this case, the kaon sector is uncorrelated to the B{sub d} and B{sub s} sectors. As in the second scenario one has {Delta}{sub d}={Delta}{sub s{identical_to}{Delta}}, however, now with a complex parameter {Delta}. Our quantitative analyses consist of global Cabibbo-Kobayashi-Maskawa (CKM) fits within the Rfit frequentist statistical approach, determining the standard model parameters and the new physics parameters of the studied scenarios simultaneously. We find that the recent measurements indicating discrepancies with the standard model are well accommodated in Scenarios I and III with new mixing phases, with a slight preference for Scenario I that permits different new CP phases in the B{sub d} and B{sub s} systems. Within our statistical framework, we find evidence of new physics in both B{sub d} and B{sub s} systems. The standard model hypothesis {Delta}{sub d}={Delta}{sub s}=1 is disfavored with p-values of 3.6{sigma} and 3.3{sigma} in Scenarios I and III, respectively. We also present an exhaustive list of numerical predictions in each scenario. In particular, we predict the CP phase in B{sub s}{yields}J/{psi}{phi} and the difference between the B{sub s} and B{sub d} semileptonic asymmetries, which will be both measured by the LHCb experiment.
- OSTI ID:
- 21504929
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 83, Issue 3; Other Information: DOI: 10.1103/PhysRevD.83.036004; (c) 2011 American Institute of Physics; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ASYMMETRY
CERN LHC
COUPLING
FLAVOR MODEL
FORECASTING
HYPOTHESIS
KAONS
MIXING
NEUTRAL CURRENTS
QUARKS
SEMILEPTONIC DECAY
STANDARD MODEL
YUKAWA POTENTIAL
ACCELERATORS
ALGEBRAIC CURRENTS
BOSONS
COMPOSITE MODELS
CURRENTS
CYCLIC ACCELERATORS
DECAY
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
GRAND UNIFIED THEORY
HADRONS
MATHEMATICAL MODELS
MESONS
NUCLEAR POTENTIAL
PARTICLE DECAY
PARTICLE MODELS
POTENTIALS
PSEUDOSCALAR MESONS
QUANTUM FIELD THEORY
QUARK MODEL
STORAGE RINGS
STRANGE MESONS
STRANGE PARTICLES
SYNCHROTRONS
UNIFIED GAUGE MODELS
WEAK PARTICLE DECAY