Single photon production at hadron colliders at NNLO QCD with realistic photon isolation

Chen, X.; Gehrmann, Thomas; Glover, E. W. N.; Hofer, M.; Huss, A.; Schürmann, Robin

doi:10.1007/jhep08(2022)094

Cited by 8 publications

(12 citation statements)

References 74 publications

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“…Applied to processes in e + e − , deep-inelastic scattering (DIS), and hadron-hadron collisions: e + e − → 3j [158,159], (di-)jets in DIS [160,161], pp → (di) − jets [162,163], pp → γγ [164], pp → γ + j/X [165], pp → V + j [166][167][168], pp → H + j [169], pp → VH( + jet) [170][171][172], and Higgs production in VBF [173]. Extensions to cope with identified jet flavours [170,174] and the photon fragmentation function [175,176]. -Sector-improved residue subtraction [177][178][179]:…”

Section: Infrared Subtraction Methods For Differential Cross Sectionsmentioning

confidence: 99%

“…Differences in a fixed-cone isolation versus a smoothcone isolation [342,343] have been the subject of many studies which assessed the impact to be at the few-percent level [1,214,[344][345][346]. Precision phenomenology based on processes with external photons thus demands an extension of the fragmentation contribution to NNLO that has been achieved recently [175,176].…”

Section: Fiducial Cutsmentioning

confidence: 99%

See 1 more Smart Citation

Les Houches 2021—physics at TeV colliders: report on the standard model precision wishlist

Huss

Huston

Jones

et al. 2023

J. Phys. G: Nucl. Part. Phys.

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Les Houches activities in 2021 were truncated due to the lack of an in-person component. However, given the rapid progress in the field and the restart of the LHC, we wanted to continue the bi-yearly tradition of updating the standard model precision wishlist. In this work we therefore review recent progress (since Les Houches 2019) in fixed-order computations for LHC applications. In addition, necessary ingredients for such calculations such as parton distribution functions, amplitudes, and subtraction methods are discussed. Finally, we indicate processes and missing higher-order corrections that are required to reach the theoretical accuracy that matches the anticipated experimental precision.

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Section: Infrared Subtraction Methods For Differential Cross Sectionsmentioning

confidence: 99%

Section: Fiducial Cutsmentioning

confidence: 99%

Les Houches 2021—physics at TeV colliders: report on the standard model precision wishlist

Huss

Huston

Jones

et al. 2023

J. Phys. G: Nucl. Part. Phys.

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“…From the theoretical point of view, isolation helps to suppress the fragmentation contribution. The fragmentation component is available in the calculations from Jetphox 1.3.1_2 [17,18] and Nnlojet [19]. In the calculations from Sherpa 2.2.2 [20], an isolation requirement is essential to avoid divergencies in the matrix elements when the photon is collinear with a parton.…”

Section: Jhep07(2023)086mentioning

confidence: 99%

Inclusive-photon production and its dependence on photon isolation in pp collisions at $$ \sqrt{s} $$ = 13 TeV using 139 fb−1 of ATLAS data

Aad

Abbott

Abeling

et al. 2023

J. High Energ. Phys.

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Measurements of differential cross sections are presented for inclusive isolated-photon production in pp collisions at a centre-of-mass energy of 13 TeV provided by the LHC and using 139 fb−1 of data recorded by the ATLAS experiment. The cross sections are measured as functions of the photon transverse energy in different regions of photon pseudorapidity. The photons are required to be isolated by means of a fixed-cone method with two different cone radii. The dependence of the inclusive-photon production on the photon isolation is investigated by measuring the fiducial cross sections as functions of the isolation-cone radius and the ratios of the differential cross sections with different radii in different regions of photon pseudorapidity. The results presented in this paper constitute an improvement with respect to those published by ATLAS earlier: the measurements are provided for different isolation radii and with a more granular segmentation in photon pseudorapidity that can be exploited in improving the determination of the proton parton distribution functions. These improvements provide a more in-depth test of the theoretical predictions. Next-to-leading-order QCD predictions from JETPHOX and SHERPA and next-to-next-to-leading-order QCD predictions from NNLOJET are compared to the measurements, using several parameterisations of the proton parton distribution functions. The measured cross sections are well described by the fixed-order QCD predictions within the experimental and theoretical uncertainties in most of the investigated phase-space region.

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“…Such an extension is available at NLO for dipole subtraction [38]. At NNLO, recent work towards fragmentation processes yielded results for heavy hadron production in top quark decays [50] in the residue subtraction method [45] and photon fragmentation [51,52] in the antenna subtraction method [43,44].…”

Section: Introductionmentioning

confidence: 99%

Antenna subtraction at NNLO with identified hadrons

Gehrmann

Stagnitto²

2022

J. High Energ. Phys.

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We extend the antenna subtraction method to include hadron fragmentation processes up to next-to-next-to-leading order (NNLO) in QCD in e+e− collisions. To handle collinear singularities associated with the fragmentation process, we introduce fragmentation antenna functions in final-final kinematics with associated phase space mappings. These antenna functions are integrated over the relevant phase spaces, retaining their dependence on the momentum fraction of the fragmenting parton. The integrated antenna functions are cross-checked against the known NNLO coefficient functions for identified hadron production from $$ {\gamma}^{\ast }/{Z}^{\ast}\to q\overline{q} $$ γ ∗ / Z ∗ → q q ¯ and H → gg processes.

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Single photon production at hadron colliders at NNLO QCD with realistic photon isolation

Cited by 8 publications

References 74 publications

Les Houches 2021—physics at TeV colliders: report on the standard model precision wishlist

Les Houches 2021—physics at TeV colliders: report on the standard model precision wishlist

Inclusive-photon production and its dependence on photon isolation in pp collisions at $$ \sqrt{s} $$ = 13 TeV using 139 fb−1 of ATLAS data

Antenna subtraction at NNLO with identified hadrons

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