Naturally Small $x_s$?

Abstract

Within the Standard Model, $x_s$ (the mixing parameter in the $B_s-{\bar{B}}_s$ system) is constrained to the range $7\le x_s\le 40$. We point out that if New Physics contributes significantly to $x_d$ (the mixing parameter in the $B_d-{\bar{B}}_d$ system), then $2\le x_s\le 7$ is possible without any fine-tuned cancellations between the Standard Model and the New Physics contributions.

9 pages, WIS-94/9/Feb-PH

References in corpus (6)

• Should Squarks Be Degenerate?
• Flavor Changing Scalar Interactions
• Flavor changing interactions mediated by scalars at the weak scale
• Chiral Perturbation Theory for $f_{D_S}/f_D$ and $B_{B_S}/B_B$
• Excited Heavy Mesons and Kaon Loops in Chiral Perturbation Theory
• Testing ETC Generation of the Top Quark Mass

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• A Model Independent Construction of the Unitarity Triangle
• The $B_s$ width difference beyond the Standard Model
• CP violation and CKM phases from angular distributions for $B_s$ decays into admixtures of CP eigenstates
• Constraining Models of New Physics in Light of Recent Experimental Results on $a_{\psi K_S}$
• CP violation and the CKM angle $\gamma$ from angular distributions of untagged $B_s$ decays governed by $\bar{b}\to \bar{c}u\bar{s}$
• Constraining New Physics with the CDF Measurement of CP Violation in $B\to \psi K_S$
• Radiative B-decay as a test of CKM unitarity