Anatomy of New Physics in B-Bbar mixing

Abstract

We analyse three different New Physics scenarios for Delta F=2 flavour-changing neutral currents in the quark sector in the light of recent data on neutral-meson mixing. We parametrise generic New Physics contributions to B_q-Bbar_q mixing (q=d,s), in terms of one complex quantity Delta_q, while three parameters Delta_K^tt, Delta_K^ct and Delta_K^cc are needed to describe K-Kbar mixing. In Scenario I, we consider uncorrelated New Physics contributions in the B_d, B_s, and K sectors. In this scenario, it is only possible to constrain the parameters Delta_d and Delta_s whereas there are no non-trivial constraints on the kaon parameters. In Scenario II, we study the case of Minimal Flavour Violation (MFV) and small bottom Yukawa coupling and Scenario III is the generic MFV case with large bottom Yukawa couplings. Our quantitative analyses consist of global 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 accomodated 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_d and B_s systems. Within our statistical framework, we find evidence of New Physics in both B_d and B_s systems. The Standard-Model hypothesis Delta_d=Delta_s=1 is disfavoured 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_s -> J psi phi and the difference between the B_s and B_d semileptonic asymmetries, which will be both measured by the LHCb experiment.

arXiv comment82 pages. Published version

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• Top mass dependent alpha_s^3 corrections to B-meson mixing in the MSSM
• Disentangling weak and strong interactions in $B\to K^{\ast }(\to K\pi )\pi$ Dalitz-plot analyses
• Detecting Fourth Generation Quarks at Hadron Colliders
• B Mixing in the Standard Model and Beyond
• The MSSM with a softly broken U(2)^3 flavor symmetry
• Selected Topics in Heavy Flavour Physics
• RGE Behaviour of SUSY with a U(2)^3 symmetry
• Effect of both Z and Z^prime - mediated flavor-changing neutral currents on $B_s$ decays into $ta{u}^{+}ta{u}^{-}$
• Review: The FLAG working group
• Gamma(K -> e nu)/Gamma(K -> mu nu) in the Minimal Supersymmetric Standard Model
• Calculating B-meson decay constants using domain-wall light quarks and nonperturbatively tuned relativistic b-quarks
• Theoretical status of the CKM Matrix
• Lessons for new physics from CKM studies
• Higgs Phenomenology in Warped Extra-Dimensions with a 4th Generation
• Heavy Flavor & Dark Sector
• The effect of z^prime boson on same-sign dimuon charge asymmetry in $b_q^0-bar{b}_q^0$ system
• $B$-mixing in and beyond the Standard model
• Constraints on the anomalous $Wtb$ couplings from $B$-physics experiments
• The Challenges of Flavour Physics
• Interpreting B-anomalies within an extended 331 gauge theory
• On the consistency between CP violation in the K vs. Bd systems within the Standard Model
• Exploring the flavour structure of the high-scale MSSM
• Challenges for New Physics in the Flavour Sector
• Phenomenology from the Lattice
• Constraining new physics in B_s meson mixing
• K0-K0bar on the Lattice
• Combined constraints on CP-violation in the Standard Model and beyond
• B^0_s and B^0 Mixing in the Standard Model and Beyond: A Progress Report
• B-meson decay constants and mixing on the lattice
• Neutral B mixing from 2+1 flavor lattice QCD
• Flavour Theory and the LHC Era
• U(2) and MFV in Supersymmetry
• Penguin contributions to B to J/Psi P Decays
• Prospects at Future B Factories
• Review on new physics in heavy flavors: B-meson sector
• Top, Polarization, LHC and New Physics
• Associated Production of Different Flavor Heavy Quarks Through $W^{\prime }$ Bosons at the LHC
• Implications of the Anomalies in B_s^0-\bar{B}_s^0 Mixing for Anomalous Tensor Couplings
• A Search for pair production of the LSP $\widetilde{{\nu }_{\tau }}$ at the CLIC via RPV Decays
• Measurement of CP violation in Bs --> J/psi phi decay