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Open accessJournal ArticleDOI: 10.1007/JHEP03(2021)034

Virtual corrections to gg → ZH in the high-energy and large-mt limits

02 Mar 2021-Journal of High Energy Physics (Springer Berlin Heidelberg)-Vol. 2021, Iss: 3, pp 1-21
Abstract: We compute the next-to-leading order virtual corrections to the partonic cross-section of the process gg → ZH, in the high-energy and large-mt limits. We use Pade approximants to increase the radius of convergence of the high-energy expansion in $$ {m}_t^2/s $$ , $$ {m}_t^2/t $$ and $$ {m}_t^2/u $$ and show that precise results can be obtained down to energies which are fairly close to the top quark pair threshold. We present results both for the form factors and the next-to-leading order virtual cross-section.

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Citations
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10 results found


Open access
01 Jan 1992-
Abstract: The prescription for the γ5 matrix within dimensional regularization in multiloop calculations is elaborated. The three-loop anomalous dimension of the singlet axial current is calculated.

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257 Citations


Open accessJournal ArticleDOI: 10.1016/J.PHYSREP.2021.03.006
Gudrun Heinrich1Institutions (1)
03 Aug 2021-Physics Reports
Abstract: The precision frontier in collider physics is being pushed at impressive speed, from both the experimental and the theoretical side. The aim of this review is to give an overview of recent developments in precision calculations within the Standard Model of particle physics, in particular in the Higgs sector. While the first part focuses on phenomenological results, the second part reviews some of the techniques which allowed the rapid progress in the field of precision calculations. The focus is on analytic and semi-numerical techniques for multi-loop amplitudes, however fully numerical methods as well as subtraction schemes for infrared divergent real radiation beyond NLO are also briefly described.

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Topics: Higgs sector (50%)

44 Citations


Open accessJournal ArticleDOI: 10.1007/JHEP01(2019)176
Abstract: We compute the NLO virtual corrections to the partonic cross section of $gg\to HH$, in the high energy limit. Finite Higgs boson mass effects are taken into account via an expansion which is shown to converge quickly. We obtain analytic results for the next-to-leading order form factors which can be used to compute the cross section. The method used for the calculation of the (non-planar) master integrals is described in detail and explicit results are presented.

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Topics: Higgs boson (56.99%), Limit (mathematics) (54%), Cross section (physics) (51%)

27 Citations


Open accessJournal ArticleDOI: 10.1016/J.PHYSREP.2021.03.006
Gudrun Heinrich1Institutions (1)
Abstract: The precision frontier in collider physics is being pushed at impressive speed, from both the experimental and the theoretical side. The aim of this review is to give an overview of recent developments in precision calculations within the Standard Model of particle physics, in particular in the Higgs sector. While the first part focuses on phenomenological results, the second part reviews some of the techniques which allowed the rapid progress in the field of precision calculations. The focus is on analytic and semi-numerical techniques for multi-loop amplitudes, however fully numerical methods as well as subtraction schemes for infrared divergent real radiation beyond NLO are also briefly described.

... read more

Topics: Higgs sector (50%)

13 Citations


Open accessJournal ArticleDOI: 10.1007/JHEP03(2021)125
Long Chen1, Gudrun Heinrich2, S. P. Jones3, M. Kerner4  +2 moreInstitutions (5)
Abstract: We present results for the two-loop helicity amplitudes entering the NLO QCD corrections to the production of a Higgs boson in association with a $Z$-boson in gluon fusion. The two-loop integrals, involving massive top quarks, are calculated numerically. Results for the interference of the finite part of the two-loop amplitudes with the Born amplitude are shown as a function of the two kinematic invariants on which the amplitudes depend.

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Topics: Top quark (57.99%), Gluon (56%), Quark (55%) ... show more

8 Citations


References
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47 results found


Open accessBook
J. J. Sakurai, Jim Napolitano1Institutions (1)
01 Jan 1985-
Abstract: Modern Quantum Mechanics is a classic graduate level textbook, covering the main quantum mechanics concepts in a clear, organized and engaging manner. The author, Jun John Sakurai, was a renowned theorist in particle theory. The second edition, revised by Jim Napolitano, introduces topics that extend the text's usefulness into the twenty-first century, such as advanced mathematical techniques associated with quantum mechanical calculations, while at the same time retaining classic developments such as neutron interferometer experiments, Feynman path integrals, correlation measurements, and Bell's inequality. A solution manual for instructors using this textbook can be downloaded from www.cambridge.org/9781108422413.

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Topics: Open quantum system (56%), Supersymmetric quantum mechanics (54%), Quantization (physics) (53%) ... show more

4,178 Citations


Open accessJournal ArticleDOI: 10.1016/S0010-4655(01)00290-9
Thomas Hahn1Institutions (1)
Abstract: This paper describes the Mathematica package FeynArts used for the generation and visualization of Feynman diagrams and amplitudes. The main features of version 3 are: generation of diagrams in three levels, user-definable model files, support for supersymmetric models, and publication-quality Feynman diagrams in PostScript or LaTeX.

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Topics: Feynman diagram (70%), Quantum field theory (56.99%), Perturbation theory (56%) ... show more

1,661 Citations


Open accessJournal ArticleDOI: 10.1016/S0010-4655(98)00173-8
Thomas Hahn1, Manuel Pérez-Victoria2Institutions (2)
Abstract: Two program packages are presented for evaluating one-loop amplitudes. They can work either in dimensional regularization or in constrained differential renormalization. The latter method is found at the one-loop level to be equivalent to regularization by dimensional reduction.

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Topics: Dimensional regularization (64%), Dimensional reduction (57.99%), Renormalization (54%) ... show more

1,449 Citations


Journal ArticleDOI: 10.1016/0003-4916(59)90051-X
Maurice Jacob1, G. C. Wick1Institutions (1)
01 Aug 1959-Annals of Physics
Abstract: The general analysis of binary reactions involving particles with arbitrary spin is reformulated in such a way, that it applies equally well to relativistic particles (including photons). This is achieved by using longitudinal spin components (“helicity states”) not only in the initial and final states, but also in the angular momentum states which are employed as usual to reduce the S-matrix to a simpler form. Expressions for the scattering and reaction-amplitude, intensity and polarization are given. They involve fewer vector-addition coefficients than the customary formulas, and no recoupling coefficients. The application to some examples is sketched, and in the Appendix some formulas are given that may be of use in the applications.

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Topics: Helicity basis (57.99%), Helicity (56.99%), Clebsch–Gordan coefficients (53%) ... show more

1,340 Citations


Open accessJournal ArticleDOI: 10.1016/S0010-4655(98)00173-8
Abstract: Two program packages are presented for evaluating one-loop amplitudes. They can work either in dimensional regularization or in constrained differential renormalization. The latter method is found at the one-loop level to be equivalent to regularization by dimensional reduction.

... read more

Topics: Dimensional regularization (64%), Dimensional reduction (56.99%), Renormalization (55%) ... show more

1,188 Citations


Performance
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20202
20181
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