We study the inclusive production of a Higgs boson in association with a high-pT photon at the LHC, detailing the leading-order features of the main processes contributing to the Hγ final state. Requiring an extra hard photon in Higgs production upsets the cross-section hierarchy for the dominant channels. The Hγ inclusive production comes mainly from photons radiated in vector-boson fusion (VBF), which accounts for about 2/3 of the total rate, for pT^(γ,jT)>30 GeV, at leading order. On the other hand, radiating a high-pT photon in the main top-loop Higgs channel implies an extra parton in the final state, which suppresses the production rate by a further αS power. As a result, the Hγ production via top loops at the LHC has rates comparable with the ones arising from either the Htt¯ production or the HW(Z)γ associated production. Then, in order of decreasing cross section, comes the single-top-plus-Higgs channel, followed in turn by the heavy-flavor fusion processes bb¯→Hγ and c barc→Hγ. The Hγ production via electroweak loops has just a minor role. At larger c.m. energies, the Httbar-γ channel surpasses the total contribution of top-loop processes. In particular, requiring pT(γ,j)>30 GeV at Sqrt(S)≃100 TeV, Htt¯γ accounts for about 1/4 of the inclusive Hγ production at leading order, about half of the total being due to VBF production.

Asking for an extra photon in Higgs production at the LHC and beyond

GABRIELLI, Emidio;
2016

Abstract

We study the inclusive production of a Higgs boson in association with a high-pT photon at the LHC, detailing the leading-order features of the main processes contributing to the Hγ final state. Requiring an extra hard photon in Higgs production upsets the cross-section hierarchy for the dominant channels. The Hγ inclusive production comes mainly from photons radiated in vector-boson fusion (VBF), which accounts for about 2/3 of the total rate, for pT^(γ,jT)>30 GeV, at leading order. On the other hand, radiating a high-pT photon in the main top-loop Higgs channel implies an extra parton in the final state, which suppresses the production rate by a further αS power. As a result, the Hγ production via top loops at the LHC has rates comparable with the ones arising from either the Htt¯ production or the HW(Z)γ associated production. Then, in order of decreasing cross section, comes the single-top-plus-Higgs channel, followed in turn by the heavy-flavor fusion processes bb¯→Hγ and c barc→Hγ. The Hγ production via electroweak loops has just a minor role. At larger c.m. energies, the Httbar-γ channel surpasses the total contribution of top-loop processes. In particular, requiring pT(γ,j)>30 GeV at Sqrt(S)≃100 TeV, Htt¯γ accounts for about 1/4 of the inclusive Hγ production at leading order, about half of the total being due to VBF production.
http://link.springer.com/article/10.1007%2FJHEP07%282016%29003
File in questo prodotto:
File Dimensione Formato  
JHEP-1607-003.pdf

accesso aperto

Descrizione: Articolo principale
Tipologia: Documento in Versione Editoriale
Licenza: Creative commons
Dimensione 568.94 kB
Formato Adobe PDF
568.94 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11368/2886117
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 10
  • ???jsp.display-item.citation.isi??? 10
social impact