Interference in the gg →h →γγ On-Shell Rate and the Higgs Boson Total Width

John Campbell; Marcela Carena; Roni Harnik; Zhen Liu

doi:10.1103/PhysRevLett.119.181801

Interference in the gg →h →γγ On-Shell Rate and the Higgs Boson Total Width

John Campbell
, Marcela Carena
, Roni Harnik
, Zhen Liu

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

We consider interference between the Higgs signal and QCD background in gg→h→γγ and its effect on the on-shell Higgs rate. The existence of sizable strong phases leads to destructive interference of about 2% of the on-shell cross section in the standard model. This effect can be enhanced by beyond the standard model physics. In particular, since it scales differently from the usual rates, the presence of interference allows indirect limits to be placed on the Higgs width in a novel way, using on-shell rate measurements. Our study motivates further QCD calculations to reduce uncertainties. We discuss possible width-sensitive observables, both using total and differential rates and find that the HL-LHC can potentially indirectly constrain widths of order tens of MeV.

Original language	English (US)
Article number	181801
Journal	Physical review letters
Volume	119
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevLett.119.181801
State	Published - Oct 30 2017
Externally published	Yes

Bibliographical note

Funding Information:
This manuscript has been co-authored by employees of the Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics. The U.S. Government retains and the publisher, by accepting the article for publication, acknowledges that the U.S. Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for U.S. Government purposes.

Publisher Copyright:
© 2017 American Physical Society.

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10.1103/PhysRevLett.119.181801

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title = "Interference in the gg →h →γγ On-Shell Rate and the Higgs Boson Total Width",

abstract = "We consider interference between the Higgs signal and QCD background in gg→h→γγ and its effect on the on-shell Higgs rate. The existence of sizable strong phases leads to destructive interference of about 2\% of the on-shell cross section in the standard model. This effect can be enhanced by beyond the standard model physics. In particular, since it scales differently from the usual rates, the presence of interference allows indirect limits to be placed on the Higgs width in a novel way, using on-shell rate measurements. Our study motivates further QCD calculations to reduce uncertainties. We discuss possible width-sensitive observables, both using total and differential rates and find that the HL-LHC can potentially indirectly constrain widths of order tens of MeV.",

author = "John Campbell and Marcela Carena and Roni Harnik and Zhen Liu",

note = "Funding Information: This manuscript has been co-authored by employees of the Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics. The U.S. Government retains and the publisher, by accepting the article for publication, acknowledges that the U.S. Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for U.S. Government purposes. Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

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AU - Campbell, John

AU - Carena, Marcela

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AU - Liu, Zhen

N1 - Funding Information: This manuscript has been co-authored by employees of the Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics. The U.S. Government retains and the publisher, by accepting the article for publication, acknowledges that the U.S. Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for U.S. Government purposes. Publisher Copyright: © 2017 American Physical Society.

PY - 2017/10/30

Y1 - 2017/10/30

N2 - We consider interference between the Higgs signal and QCD background in gg→h→γγ and its effect on the on-shell Higgs rate. The existence of sizable strong phases leads to destructive interference of about 2% of the on-shell cross section in the standard model. This effect can be enhanced by beyond the standard model physics. In particular, since it scales differently from the usual rates, the presence of interference allows indirect limits to be placed on the Higgs width in a novel way, using on-shell rate measurements. Our study motivates further QCD calculations to reduce uncertainties. We discuss possible width-sensitive observables, both using total and differential rates and find that the HL-LHC can potentially indirectly constrain widths of order tens of MeV.

AB - We consider interference between the Higgs signal and QCD background in gg→h→γγ and its effect on the on-shell Higgs rate. The existence of sizable strong phases leads to destructive interference of about 2% of the on-shell cross section in the standard model. This effect can be enhanced by beyond the standard model physics. In particular, since it scales differently from the usual rates, the presence of interference allows indirect limits to be placed on the Higgs width in a novel way, using on-shell rate measurements. Our study motivates further QCD calculations to reduce uncertainties. We discuss possible width-sensitive observables, both using total and differential rates and find that the HL-LHC can potentially indirectly constrain widths of order tens of MeV.

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Interference in the gg →h →γγ On-Shell Rate and the Higgs Boson Total Width

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