Meson hyperfine splittings and leptonic decays

Barbieri, Riccardo; Gatto, R.; Kögerler, Reinhart; Kunszt, Z.

doi:10.1016/0370-2693(75)90267-1

Cited by 194 publications

(87 citation statements)

References 4 publications

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“…The leading 1/v singularity and the constant term of R A can be predicted from the nonrelativistic Greens function for the Coulomb potential and the O(α s ) calculation. The next-to-leading term is determined by the combination of one loop results again with the Coulomb singularities [14,15,10]. One finds…”

Section: Threshold Behaviourmentioning

confidence: 99%

Heavy quark vacuum polarisation to three loops

1996

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Section: Threshold Behaviourmentioning

confidence: 99%

Heavy quark vacuum polarisation to three loops

1996

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“…where N sig is the number of the fitted signal yield, ǫ is the signal selection efficiency, B is [50]. These corrections are as large as 30% to first order in strong coupling constant (α S ), but have comparable uncertainties [94].…”

Section: Chapter 6 Results and Conclusionmentioning

confidence: 99%

“…In the SM, the value of f Υ is defined as: 24) where C QCD ≈ 0.7 − 1.0 [49] includes the QCD loop corrections and relativistic corrections to B(Υ(nS ) → γA 0 ) [48], as well as the leptonic width of Υ(nS ) → l + l − [50]. However, the…”

Section: Phenomenology Of the Light Scalar Statesmentioning

confidence: 99%

Search for Di-Muon Decays of a Light Scalar Higgs Boson in Radiative Upsilon(1S) Decays

Prasad

2013

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“…Other than the η b (1, 2), their masses are unmeasured and have to be taken from calculation (Refs. [37,45,[47][48][49]). We give their values, along with |R η b (n) (0)| 2 in Table III.…”

Section: A a − η B Mixing And Gg Annihilationmentioning

confidence: 99%

Implications of a new light scalar near the bottomonium regime

Baumgart

Katz²

2012

J. High Energ. Phys.

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We study the decay modes of a new, light spin-0 particle, arguing that if the mass of the (pseudo)scalar is ∼ 11 − 15 GeV, it can have an appreciable branching ratio into bottomonium, in particular the rare η b s. Using non-relativistic QCD (NRQCD), we calculate its decay rate to bottomonia for mass splittings greater than the typical momentum transfer within the bound state. It can exceed that of decays to other Standard Model fermions under the assumption of couplings proportional to those of the Standard Model. At smaller splittings, where our computational methods break down, we estimate the rate into bottomonia using data-driven methods. When the spin-0 state decays to bottomonia whose mass is too light to produce B-meson pairs, we get a qualitatively new experimental signature, decays to b-quarks invisible to b-tagging. Such a light, spinless particle can arise in extended Higgs sectors, making this channel potentially observable in decay chains initiated by the subdominant decay of a Standard Model-like Higgs to a pair of them.

show abstract

Meson hyperfine splittings and leptonic decays

Cited by 194 publications

References 4 publications

Heavy quark vacuum polarisation to three loops

Heavy quark vacuum polarisation to three loops

Search for Di-Muon Decays of a Light Scalar Higgs Boson in Radiative Upsilon(1S) Decays

Implications of a new light scalar near the bottomonium regime

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