Leptonic universality breaking in Upsilon decays as a probe of new physics

Abstract

In this work we examine the possible existence of new physics beyond the standard model which could modify the branching fractions of the leptonic (mainly tauonic) decays of bottomonium vector resonances below the $B\bar{B}$ threshold. The decay width is factorized as the product of two pieces: a) the probability of an intermediate pseudoscalar color-singlet $b\bar{b}$ state (coupling to the dominant Fock state of the Upsilon via a magnetic dipole transition) and a soft (undetected) photon; b) the annihilation width of the $b\bar{b}$ pair into two leptons, mediated by a non-standard CP-odd Higgs boson of mass about 10 GeV, introducing a quadratic dependence on the lepton mass in the partial width. The process would be unwittingly ascribed to the ${\rm Y}$ leptonic channel thereby (slightly) breaking lepton universality. A possible mixing of the pseudoscalar Higgs and bottomonium resonances is also considered. Finally, several experimental signatures to check out the validity of the conjecture are discussed.

LaTeX, 22 pages, 2 EPS figures

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Cited by in corpus (27)

• The Next-to-Minimal Supersymmetric Standard Model
• The Physics of the B Factories
• Role of h --> eta eta in Intermediate-Mass Higgs Boson Searches at the Large Hadron Collider
• New constraints on a light CP-odd Higgs boson and related NMSSM Ideal Higgs Scenarios
• Indirect detection of light neutralino dark matter in the NMSSM
• Hunting a light CP-odd non-standard Higgs boson through its tauonic decay at a (Super) B factory
• Radiative Upsilon decays and a light pseudoscalar Higgs in the NMSSM
• A light CP-odd Higgs boson and the muon anomalous magnetic moment
• Test of lepton universality in Upsilon(1S) decays at BaBar
• Decays of a NMSSM CP-odd Higgs in the low-mass region
• B decay anomalies in an effective theory
• First Observation of Upsilon(3S) --> tau tau and Tests of Lepton Universality in Upsilon Decays
• Spectroscopy, leptonic decays and the nature of heavy quarkonia
• Updated constraints from radiative ${\rm Y}$ decays on a light CP-odd Higgs
• Reduced branching ratio for H -> AA -> 4 tau from A - eta_b mixing
• Revisiting the Heavy Vector Quarkonium Leptonic Widths
• Proposal for testing lepton universality in Upsilon decays at a B-factory running at ${\rm Y}(3S)$
• Precision measurement of the $\mathcal{B}({\rm Y}(3S)\to {\tau }^{+}{\tau }^{-})/\mathcal{B}({\rm Y}(3S)\to {\mu }^{+}{\mu }^{-})$ ratio
• On a Latent Structure of Lepton Universality
• Searching for new physics in bottomonium decays
• Z-pole observables in an effective theory
• Hints of new physics in bottomonium decays and spectroscopy
• Prospects of probing new physics in bottomonium decays and spectroscopy
• Searching for new physics in Upsilon decays
• Dark Matter EFT, the Third -- Neutrino WIMPs
• The Super Flavor Factory
• Universality and Lepton Flavor Violation in Upsilon Decays at CLEO