Constraining the Phase of Bs-B¯s Mixing
Abstract
New physics contributions to Bs-B¯s mixing can be parametrized by the size (rs2) and the phase (2θs) of the total mixing amplitude relative to the standard model amplitude. The phase has so far been unconstrained. We first use the D0 measurement of the semileptonic CP asymmetry ASL to obtain the first constraint on the semileptonic CP asymmetry in Bs decays, ASLs=-0.008±0.011. Then we combine recent measurements by the CDF and D0 Collaborations—the mass difference (ΔMs), the width difference (ΔΓs), and ASLs—to constrain 2θs. The errors on ΔΓs and ASLs should still be reduced to have a sensitive probe of the phase, yet the central values are such that the regions around 2θs∼3π/2 and, in particular, 2θs∼π/2, are disfavored.
- Publication:
-
Physical Review Letters
- Pub Date:
- October 2006
- DOI:
- 10.1103/PhysRevLett.97.151801
- arXiv:
- arXiv:hep-ph/0605028
- Bibcode:
- 2006PhRvL..97o1801G
- Keywords:
-
- 12.60.-i;
- 12.15.Ji;
- 13.20.He;
- 14.40.Nd;
- Models beyond the standard model;
- Applications of electroweak models to specific processes;
- Decays of bottom mesons;
- Bottom mesons;
- High Energy Physics - Phenomenology;
- High Energy Physics - Experiment
- E-Print:
- V3: Following clarifications by D0, our range for A_{SL} (and consequently for A_{SL}^s) has been modified, strengthening our conclusions. A new figure has been added