Collider physics at the precision frontier

Heinrich, G.

doi:10.1016/j.physrep.2021.03.006

Cited by 154 publications

(146 citation statements)

References 924 publications

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“…For this reason a lot of theoretical effort has been invested in their evaluation and in the development of ever-more efficient methods for their calculation. A number of gauge theories are being studied, starting from string and supersymmetric theories [1][2][3][4][5][6][7][8][9][10][11][12][13], to gravity [14][15][16], to Yang-Mills [17,18], to QED [19] and QCD [20][21][22][23][24][25][26][27][28][29][30][31][32] and ultimately to the full Standard Model [33][34][35][36][37][38][39][40][41][42]. Research on generic methods for solving multi-loop integrals is also ongoing [43][44][45][46][47][48]…”

Section: Introductionmentioning

confidence: 99%

Two-loop leading-color helicity amplitudes for three-photon production at the LHC

Chawdhry

Czakon

Mitov

et al. 2021

J. High Energ. Phys.

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We calculate all planar contributions to the two-loop massless helicity amplitudes for the process $$ q\overline{q} $$ q q ¯ → γγγ. The results are presented in fully analytic form in terms of the functional basis proposed recently by Chicherin and Sotnikov. With this publication we provide the two-loop contributions already used by us in the NNLO QCD calculation of the LHC process pp → γγγ [Chawdhry et al. (2019)]. Our results agree with a recent calculation of the same amplitude [Abreu et al. (2020)] which was performed using different techniques. We combine several modern computational techniques, notably, analytic solutions for the IBP identities, finite-field reconstruction techniques as well as the recent approach [Chen (2019)] for efficiently projecting helicity amplitudes. Our framework appears well-suited for the calculation of two-loop multileg amplitudes for which complete sets of master integrals exist.

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Section: Introductionmentioning

confidence: 99%

Two-loop leading-color helicity amplitudes for three-photon production at the LHC

Chawdhry

Czakon

Mitov

et al. 2021

J. High Energ. Phys.

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“…The two-loop amplitude for tt H production is not known. Being a five-leg amplitude involving particles with different masses, its computation is at the frontier of current possibilities [23].…”

Section: Introductionmentioning

confidence: 99%

“…Various methods have been proposed and used to overcome these difficulties at the NNLO level (see Refs. [23][24][25][26] and references therein).…”

Section: Introductionmentioning

confidence: 99%

$${t {{\bar{t}}}H}$$ production at NNLO: the flavour off-diagonal channels

et al. 2021

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We consider QCD radiative corrections to the associated production of a heavy-quark pair ($$Q{{\bar{Q}}}$$ Q Q ¯ ) with a generic colourless system F at hadron colliders. We discuss the resummation formalism for the production of the $$Q{{\bar{Q}}}F$$ Q Q ¯ F system at small values of its total transverse momentum $$q_T$$ q T . We present the results of the corresponding resummation coefficients at next-to-leading and, partly, next-to-next-to-leading order. The perturbative expansion of the resummation formula leads to the explicit ingredients that can be used to apply the $$q_T$$ q T subtraction formalism to fixed-order calculations for this class of processes. We use the $$q_T$$ q T subtraction formalism to perform a fully differential perturbative computation for the production of a top-antitop quark pair and a Higgs boson. At next-to-leading order we compare our results with those obtained with established subtraction methods and we find complete agreement. We present, for the first time, the results for the flavour off-diagonal partonic channels at the next-to-next-to-leading order.

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“…In the collisions data from this run, about 7 million Higgs bosons have been produced, so the LHC can be considered to be the first 'Higgs factory' , even though only a fraction could be identified and used to study its properties. LHC data analysis proceeds in parallel with advances in precision theoretical calculations for the SM production and decay rates as well as modelling of the backgrounds [53][54][55][56] .…”

Section: Discovery and First Measurementsmentioning

confidence: 99%