Constraints on a New Light Spin-One Particle from Rare b -> s Transitions

Abstract

The anomalously large like-sign dimuon charge asymmetry in semileptonic b-hadron decays recently measured by the D0 Collaboration may be hinting at the presence of CP-violating new physics in the mixing of B_s mesons. It has been suggested that the effect of a nonstandard spin-1 particle lighter than the b quark with flavor-changing couplings to b and s quarks can reproduce the D0 result within its one-sigma range. Here we explore the possibility that the new particle also couples to charged leptons l=e,mu and thus contributes to rare b -> s processes involving the leptons. We consider in particular constraints on its couplings from existing experimental data on the inclusive B -> X_s l^+ l^- and exclusive B -> K^{(*)} l^+ l^- decays, as well as the anomalous magnetic moments of the leptons. We find that there is parameter space of the particle that is allowed by the current data. Future measurements of these B transitions and rare decays of the B_s meson, such as B_s -> (phi,eta,eta') l^+ l^- and B_s -> l^+ l^-, at LHCb and next-generation B factories can probe its presence or couplings more stringently.

19 pages, 5 figures

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Cited by in corpus (7)

• Measurement of the B->Xsl+l- branching fraction and search for direct CP violation from a sum of exclusive final states
• A simple relation for B_s-mixing
• New Physics in Gamma_12^s: (sbar b) (taubar tau) Operators
• Study of Bs-> ϕl^+ l^-$ Decay in a Single Universal Extra Dimension
• Constraining Nonstandard Neutrino-Electron Interactions due to a New Light Spin-1 Boson
• Associated Production of Different Flavor Heavy Quarks Through $W^{\prime }$ Bosons at the LHC
• A Search for pair production of the LSP $\widetilde{{\nu }_{\tau }}$ at the CLIC via RPV Decays