Constraints on new physics from the quark mixing unitarity triangle

TL;DR

The allowed ranges of new physics contributions to DeltaF=2 processes and of the time-dependent CP asymmetry in Bs-->J/psivarphi decays are presented and a significant constraint on new physics in the Bs sector is obtained.

Abstract

The status of the Unitarity Triangle beyond the Standard Model including the most recent results on Delta m_s, on dilepton asymmetries and on width differences is presented. Even allowing for general New Physics loop contributions the Unitarity Triangle must be very close to the Standard Model result. With the new measurements from the Tevatron, we obtain for the first time a significant constraint on New Physics in the B_s sector. We present the allowed ranges of New Physics contributions to Delta F=2 processes, and of the time-dependent CP asymmetry in B_s to J/Psi phi decays.

Figures (4)

• Figure 1: Determination of $\bar{\rho}$ and $\bar{\eta}$ from the constraints on $\alpha$, $\beta$, $\gamma$, $\vert V_{ub}/V_{cb}\vert$, $\Delta m_d/\Delta m_s$ (UUT fit, left) and from the constraints on $\alpha$, $\beta$, $\gamma$, $\vert V_{ub}/V_{cb}\vert$, $\Delta m_d$, $\Delta m_s$, $\varepsilon_K$, $A_\mathrm{SL}$, $A_\mathrm{CH}$ and $\Delta \Gamma_q/\Gamma_q$ (generalized NP fit, right). In the right plot, only tree-level constraints are shown.
• Figure 2: From left to right, constraints on $\phi_{B_d}$ vs. $C_{B_d}$, $\phi_{B_s}$ vs. $C_{B_s}$, $\phi_d^\mathrm{NP}$ vs. $A_d^\mathrm{NP}/A_d^\mathrm{SM}$ and $\phi_s^\mathrm{NP}$ vs. $A_s^\mathrm{NP}/A_s^\mathrm{SM}$ from the NP generalized analysis.
• Figure 3: Predictions for $A_\mathrm{SL}$ and $A_\mathrm{CH}$ in the presence of NP, obtained without including these observables in the fit. The lower peak in the p.d.f.'s correspond to values of $\rho$ and $\eta$ in the third quadrant.
• Figure 4: Constraints on $\phi_{B_q}$, $C_{B_q}$ and $C_{\varepsilon_K}$ coming from the NP generalized analysis. The correlation between $C_{B_d}$ and $C_{B_s}$ is also shown.