Signatures of a Flavor Changing $Z^{\prime }$ Boson in $B_q\to \gamma Z^{\prime }$

Abstract

Rare $B$ meson decays offer an opportunity to probe a light hidden $Z^{\prime }$ boson. In this work we explore a new channel $B_q\to \gamma Z^{\prime }$ ($q=d,s$) followed by a cascade decay of $Z^{\prime }$ into an invisible (neutrino or dark matter) or charged lepton pair ${\ell }^{+}{\ell }^{-}$ ($\ell =e,\mu )$. The study is based on a simplified effective model where the down quark sector has tiny flavor-changing neutral current couplings with $Z^{\prime }$. For the first time, we calculate $\mathrm{BR}(B_q\to \gamma Z^{\prime })$ at the leading power of $1/m_b$ and $1/E_{\gamma }$. Confronting with the strong constraints from semi-invisible decays of $B$ meson, we find that the branching ratio for $B_d\to \mathrm{invisible}+\gamma$ can be larger than its Standard Model prediction, leaving a large room for new physics, in particular for light dark matter. Additionally, the branching ratio for $B_d\to e^{+}{e}^{-}\gamma$ can also be sizable when the corresponding flavor violating $Z^{\prime }$ coupling to quarks is of the axial-vector type. On the other hand, the predicted branching ratios of $B_d\to {\mu }^{+}{\mu }^{-}\gamma$ and $B_s\to {\ell }^{+}{\ell }^{-}\gamma$ are severely constrained by the experimental measurements.

arXiv comment23 pages, 14 figures

References in corpus (72)

• Final Report of the Muon E821 Anomalous Magnetic Moment Measurement at BNL
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Test of lepton universality using $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Secluded U(1) below the weak scale
• Reevaluation of the Hadronic Contributions to the Muon g-2 and to alpha(MZ)
• Test of lepton universality with $B^0\to K^{\ast 0}{\ell }^{+}{\ell }^{-}$ decays
• The muon $g-2$ and $\alpha (M_Z^2)$: a new data-based analysis
• (g-2)_mu and alpha(M_Z^2) re-evaluated using new precise data
• Reevaluation of the hadronic vacuum polarisation contributions to the Standard Model predictions of the muon g-2 and alpha(mZ) using newest hadronic cross-section data
• B_{d,s}->rho, omega, K*, phi Decay Form Factors from Light-Cone Sum Rules Revisited
• A new evaluation of the hadronic vacuum polarisation contributions to the muon anomalous magnetic moment and to $\mathbf{\alpha }({\mathbf{m}}_{\mathbf{Z}}^2)$
• Search for a dark photon in e+e- collisions at BABAR
• Cold dark matter: controversies on small scales
• Measurement of the Differential Branching Fraction and Forward-Backword Asymmetry for B->K(*)l+l-
• Search for lepton-universality violation in $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Flavor Changing Effects in Theories with a Heavy Z' Boson with Family Non-Universal Couplings
• Differential branching fractions and isospin asymmetries of $B\to K^{(\ast )}{\mu }^{+}{\mu }^{-}$ decays
• Asymptotics of Heavy-Meson Form Factors
• The Dark Photon
• "Dark" Z implications for Parity Violation, Rare Meson Decays, and Higgs Physics
• Search for $A^{\prime }\to {\mu }^{+}{\mu }^{-}$ decays
• Explaining Dark Matter and $B$ Decay Anomalies with an $L_{\mu }-L_{\tau }$ Model
• Search for B --> K(*) nu nubar and invisible quarkonium decays
• Search for the decay $B_s^0\to {\overline{D}}^0{f}_0(980)$
• Search for $\mathbf{B}\to \mathbf{h\nu }\bar{\mathbf{\nu }}$ decays with semileptonic tagging at Belle
• Lepton flavor violating Z' explanation of the muon anomalous magnetic moment
• Renormalization-Group Evolution of the B-Meson Light-Cone Distribution Amplitude
• Status of the Fermilab Muon (g-2) Experiment
• Rare $B$ Decays as Tests of the Standard Model
• Constraints on light mediators: confronting dark matter searches with B physics
• B meson distribution amplitude from B --> γl ν
• Search for B -> h(*) nu nubar with the full Belle Y(4S) data sample
• Factorization in leptonic radiative B -> gamma eνdecays
• Factorization and Sudakov Resummation in Leptonic Radiative B Decay
• A New Light Particle in B Decays?
• Explaining the $R_K$ and $R_{K^{\ast }}$ anomalies
• Direct CP, Lepton Flavor and Isospin Asymmetries in the Decays B->K(*)l+l-
• Z'-induced FCNC decays of top, beauty and strange quarks
• Probing dark sectors with long-lived particles at BELLE II
• Rare radiative leptonic decays B_{d,s}-> l^+l^-γ
• New light mediators for the $R_K$ and $R_{K^{\ast }}$ puzzles
• Light Dark Matter from the U(1)_X Sector in the NMSSM with Gauge Mediation
• First measurement of the differential branching fraction and $CP$ asymmetry of the $B^{\pm }\to {\pi }^{\pm }{\mu }^{+}{\mu }^{-}$ decay
• Searching for light Dark Matter in heavy meson decays
• B_q -> l^+ l^- gamma decays in light cone QCD
• Gauge invariance and form factors for the decay B --> gamma l^+l^-
• Loophole in K --> pi nu nubar Search and New Weak Leptonic Forces
• Study of $B_{s,d}\to l^{+}{l}^{-}\gamma$ Decays
• A search for the decay $B^{+}\to K^{+}\nu \bar{\nu }$
• Light Resonances and the Low-$q^2$ Bin of $R_{K^{\ast }}$
• Charge Asymmetry and Photon Energy Spectrum in the Decay $B_s\to l^{+}{l}^{-}\gamma$
• B meson Dileptonic Decays in NMSSM with a Light CP-odd Higgs Boson
• B-meson dileptonic decays enhanced by supersymmetry with large $\tan \beta$
• Rare FCNC radiative leptonic $B_{s,d}\to \gamma l^{+}{l}^{-}$ decays in the Standard Model
• Search for the rare decays $B_s^0\to e^{+}{e}^{-}$ and $B^0\to e^{+}{e}^{-}$
• Evidence for the decay $B_s^0\to \overline{K}{}^{\ast 0}{\mu }^{+}{\mu }^{-}$
• Study of $B_s\to {\ell }^{+}{\ell }^{-}\gamma$ decays in covariant quark model
• Search for $B\to \pi {\ell }^{+}{\ell }^{-}$ Decays at Belle
• Dark matter and $B$-meson anomalies in a flavor dependent gauge symmetry
• Improved Limits on $B^0$ decays to invisible $(+\gamma )$ final states
• Fourth generation effects in rare (B_s -> l^+ l^-) and (B_s -> l^+ l^- gamma) decays
• $B_s(B_d)\to \gamma \nu \bar{\nu }$ }
• Flavour anomalies from a split dark sector
• Bs to mu mu gamma from Bs to mu mu
• A Search for the Rare Decays B --> pi l+l- and B0 --> eta l+l-
• Rare B -> Nu Barnu Gamma Decay in Light Cone QCD Sum Rule
• Search for the Decays B0->e+e-gamma and B0->mu+mu-gamma
• The study of light invisible particles in $B_c$ decays
• Constraints on Light Dark Matter from Single-Photon Decays of Heavy Quarkonium
• Search for $B^0$ Decays to Invisible Final States ($+\gamma$) at Belle
• Study of $B_s^0\to l^{+}{l}^{-}\gamma$ decays in the nonuniversal Z' model
• Long-distance QCD effects in FCNC $B\to \gamma l^{+}{l}^{-}$ decays

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• Test of lepton universality in beauty-quark decays
• Tests of lepton universality using $B^0\to K_S^0{\ell }^{+}{\ell }^{-}$ and $B^{+}\to K^{\ast +}{\ell }^{+}{\ell }^{-}$ decays
• Methods for high-precision determinations of radiative-leptonic decay form factors using lattice QCD
• $(g-2{)}_{\mu }$ Versus $K\to \pi +E_{miss}$ Induced by the $(B-L{)}_{23}$ Boson