English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present a calculation of the rates for Higgs-boson decays to a vectorheavy-quarkonium state plus a photon, where the heavy quarkonium states are theJ/psi and the Upsilon(nS) states, with n=1, 2, or 3. The calculation is carriedout in the light-cone formalism, combined with nonrelativistic QCDfactorization, and is accurate at leading order in m_Q^2/m_H^2, where m_Q isthe heavy-quark mass and m_H is the Higgs-boson mass. The calculation containscorrections through next-to-leading order in the strong-coupling constantalpha_s and the square of the heavy-quark velocity v, and includes aresummation of logarithms of m_H^2/m_Q^2 at next-to-leading logarithmicaccuracy. We have developed a new method, which makes use of Abel summation,accelerated through the use of Pade approximants, to deal with divergences inthe resummed expressions for the quarkonium light-cone distribution amplitudes.This approach allows us to make definitive calculations of the resummationeffects. Contributions from the order-alpha_s and order-v^2 corrections to thelight-cone distribution amplitudes that we obtain with this new method differsubstantially from the corresponding contributions that one obtains from amodel light-cone distribution amplitude [M. Koenig and M. Neubert, J. HighEnergy Phys. 08 (2015) 012]. Our results for the real parts of thedirect-process amplitudes are considerably smaller than those from one earliercalculation [G. T. Bodwin, H. S. Chung, J.-H. Ee, J. Lee, and F. Petriello,Phys. Rev. D 90, 113010 (2014)], reducing the sensitivity to theHiggs-boson--heavy-quark couplings, and are somewhat smaller than those fromanother earlier calculation [M. Koenig and M. Neubert, J. High Energy Phys. 08(2015) 012]. However, our results for the standard-model Higgs-boson branchingfractions are in good agreement with those in M. Koenig and M. Neubert, J. HighEnergy Phys. 08 (2015) 012.

New approach to the resummation of logarithms in Higgs-boson decays to a vector quarkonium plus a photon