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- Title
LEPTONIC UNIVERSALITY BREAKING IN ϒ DECAYS AS A PROBE OF NEW PHYSICS.
- Authors
SANCHIS-LOZANO, MIGUEL ANGEL
- 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 ϒ 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.
- Subjects
LEPTONS (Nuclear physics); PARTICLE decays; PARTICLES (Nuclear physics); RESONANCE; MAGNETIC dipoles; LEPTONS (Nuclear physics) -- Polarization; NUCLEAR reactions
- Publication
International Journal of Modern Physics A: Particles & Fields; Gravitation; Cosmology; Nuclear Physics, 2004, Vol 19, Issue 13, p2183
- ISSN
0217-751X
- Publication type
Article
- DOI
10.1142/S0217751X04018117