Exclusive radiative Higgs decays as probes of light-quark Yukawa couplings

Publication type:
Journal article
Metadata:
Autoren
  • Matthias Koenig
  • Matthias Neubert
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000359257000001&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.1007/JHEP08(2015)012
Externe Identifier
  • Clarivate Analytics Document Solution ID: CO6HE
ISSN
1029-8479
Ausgabe der Veröffentlichung
8
Zeitschrift
JOURNAL OF HIGH ENERGY PHYSICS
Schlüsselwörter
  • Higgs Physics
  • Rare Decays
  • Resummation
  • Effective field theories
Artikelnummer
ARTN 012
Datum der Veröffentlichung
2015
Status
Published
Titel
Exclusive radiative Higgs decays as probes of light-quark Yukawa couplings
Sub types
  • Article

Data source: Web of Science (Lite)

Other metadata sources:
Abstract
<jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>We present a detailed analysis of the rare exclusive Higgs boson decays into a single vector meson and a photon and investigate the possibility of using these processes to probe the light-quark Yukawa couplings. We work with an effective Lagrangian with modified Higgs couplings to account for possible new-physics effects in a model-independent way. The <jats:italic>h</jats:italic> → <jats:italic>Vγ</jats:italic> decay rate is governed by the destructive interference of two amplitudes, one of which involves the Higgs coupling to the quark anti-quark pair inside the vector meson. We derive this amplitude at next-to-leading order in <jats:italic>α</jats:italic> <jats:sub> <jats:italic>s</jats:italic> </jats:sub> using QCD factorization, including the resummation of large logarithmic corrections and accounting for the effects of flavor mixing. The high factorization scale <jats:italic>μ</jats:italic> ∼ <jats:italic>m</jats:italic> <jats:sub> <jats:italic>h</jats:italic> </jats:sub> ensures that our results are rather insensitive to the hadronic parameters characterizing the light-cone distribution amplitude of the vector meson. The second amplitude arises from the loop-induced effective <jats:italic>hγγ</jats:italic> <jats:sup>*</jats:sup> and <jats:italic>hγZ</jats:italic> <jats:sup>*</jats:sup> couplings, where the off-shell gauge boson converts into the vector meson. We devise a strategy to eliminate theoretical uncertainties related to this amplitude to almost arbitrary precision. This opens up the possibility to probe for <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \mathcal{O}(1) $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>O</mml:mi> <mml:mfenced> <mml:mn>1</mml:mn> </mml:mfenced> </mml:math> </jats:alternatives> </jats:inline-formula> modifications of the <jats:italic>c</jats:italic>- and <jats:italic>b</jats:italic>-quark Yukawa couplings and <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \mathcal{O}(30) $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>O</mml:mi> <mml:mfenced> <mml:mn>30</mml:mn> </mml:mfenced> </mml:math> </jats:alternatives> </jats:inline-formula> modifications of the <jats:italic>s</jats:italic>-quark Yukawa coupling in the high-luminosity LHC run. In particular, we show that measurements of the ratios Br(<jats:italic>h</jats:italic> → Υ(<jats:italic>nS</jats:italic>)<jats:italic>γ</jats:italic>)/Br(<jats:italic>h</jats:italic> → <jats:italic>γγ</jats:italic>) and <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \mathrm{B}\mathrm{r}\left(h\to b\overline{b}\right)/\mathrm{B}\mathrm{r}\left(h\to \gamma \gamma \right) $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>B</mml:mi> <mml:mi>r</mml:mi> <mml:mfenced> <mml:mrow> <mml:mi>h</mml:mi> <mml:mo>→</mml:mo> <mml:mi>b</mml:mi> <mml:mover> <mml:mi>b</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:mrow> </mml:mfenced> <mml:mo>/</mml:mo> <mml:mi>B</mml:mi> <mml:mi>r</mml:mi> <mml:mfenced> <mml:mrow> <mml:mi>h</mml:mi> <mml:mo>→</mml:mo> <mml:mi>γ</mml:mi> <mml:mi>γ</mml:mi> </mml:mrow> </mml:mfenced> </mml:math> </jats:alternatives> </jats:inline-formula> can provide complementary information on the real and imaginary parts of the <jats:italic>b</jats:italic>-quark Yukawa coupling. More accurate measurements would be possible at a future 100 TeV proton-proton collider.</jats:p>
Autoren
  • Matthias König
  • Matthias Neubert
DOI
10.1007/jhep08(2015)012
eISSN
1029-8479
Ausgabe der Veröffentlichung
8
Zeitschrift
Journal of High Energy Physics
Sprache
en
Artikelnummer
12
Online publication date
2015
Datum der Veröffentlichung
2015
Status
Published
Herausgeber
Springer Science and Business Media LLC
Herausgeber URL
http://dx.doi.org/10.1007/jhep08(2015)012
Datum der Datenerfassung
2021
Titel
Exclusive radiative Higgs decays as probes of light-quark Yukawa couplings
Ausgabe der Zeitschrift
2015

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