Zγ production in vector-boson scattering at next-to-leading order QCD

Campanario, Francisco; Kerner, M.; Zeppenfeld, D.

doi:10.1007/jhep01(2018)160

Cited by 9 publications

(17 citation statements)

References 41 publications

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“…In order to compare the measured fiducial cross-section (at particle level) with the NLO theory predictions by Vbfnlo (at parton level) [48], a correction factor A parton is derived. Such a correction accounts for differences between the parton-and particle-level phase-space regions.…”

Section: Fiducial Zγjj Cross-section Measurements In the Charged-leptmentioning

confidence: 99%

“…while the SM NLO prediction [48] Table 6. Summary of the main relative uncertainties in cross-section measurements presented in this paper.…”

Section: Fiducial Electroweak Production Cross-section Determinationmentioning

confidence: 99%

“…The total Zγjj cross-section predictions at QCD NLO [48] are derived adding the individual Vbfnlo QCD and EWK production predictions with uncertainties calculated as described in section 3. They are found to be: These predictions include A parton corrections derived from Sherpa MC samples reported before for EWK production as well as A parton corrections for QCD production, which are 0.76 and 0.82 in the CR and SR respectively, with negligible statistical uncertainty.…”

Section: Total Zγjj Fiducial Cross-section Measurementsmentioning

confidence: 99%

“…The aQGC cross-sections are calculated at NLO precision in α s [48] using the Vbfnlo event generator and parameterized as a function of the dimension-8 operator anomalous coupling values. For each operator, the cross-sections are calculated for five aQGC coupling values.…”

Section: Jhep07(2017)107mentioning

confidence: 99%

“…The maximum allowed form-factor values Λ FF are chosen, according to the unitarity bounds calculated by Vbfnlo and are also reported in this table. The latest NLO cross-section prediction of Vbfnlo is used in the aQGC parameterization [48].…”

Section: Jhep07(2017)107mentioning

confidence: 99%

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Studies of Zγ production in association with a high-mass dijet system in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

Aaboud¹,

Aad²,

Abbott³

et al. 2017

J. High Energ. Phys.

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The production of a Z boson and a photon in association with a high-mass dijet system is studied using 20.2 fb −1 of proton-proton collision data at a centre-of-mass energy of √ s = 8 TeV recorded with the ATLAS detector in 2012 at the Large Hadron Collider. Final states with a photon and a Z boson decaying into a pair of either electrons, muons, or neutrinos are analysed. Electroweak and total pp → Zγjj cross-sections are extracted in two fiducial regions with different sensitivities to electroweak production processes. Quartic couplings of vector bosons are studied in regions of phase space with an enhanced contribution from pure electroweak production, sensitive to vector-boson scattering processes V V → Zγ. No deviations from Standard Model predictions are observed and constraints are placed on anomalous couplings parameterized by higher-dimensional operators using effective field theory. Keywords: Electroweak interaction, Hadron-Hadron scattering (experiments)ArXiv ePrint: 1705.01966Open Access, Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP 3 .https://doi.org/10.1007/JHEP07(2017)107 The ATLAS collaboration 30 JHEP07(2017)107 IntroductionThe scattering of two vector bosons, V V → V V with V = W /Z/γ, is a key process for probing the SU(2) L × U(1) Y gauge symmetry of the electroweak theory that determines the self-couplings of the vector bosons. In particular, it is important to independently test the triple and quartic gauge-boson coupling strengths (TGCs and QGCs), since new phenomena could generate additional contributions to QGCs with respect to the Standard Model (SM) predictions [1-4], while not significantly affecting the TGCs [5]. Experimental information about QGCs is still limited. At the Large Hadron Collider (LHC), it can be deduced from studies of processes with either three bosons in the final state [6][7][8][9][10] or involving pure electroweak production of heavy dibosons [11][12][13][14]. In particular, the CMS experiment recently studied Zγ and used these results to set limits on anomalous QGCs. Final states involving photons have higher rates than those involving only W and Z bosons identified via their leptonic decay modes. The Zγjj electroweak (EWK) production (qq → qqZγ) -where j represents a jet and q a quark -contains processes with fourth-order electroweak coupling O(α 4 em ). These include vector-boson scattering (VBS) as well as non-VBS diagrams, e.g. when the Z boson and the photon are radiated off the initial-or final-state quarks ( figure 1, left). The VBS processes do not respect the electroweak gauge symmetry when taken in isolation and cannot be studied separately from other electroweak processes, due to large interference effects.The same Zγjj final state can be produced by QCD-mediated processes -in the following simply called "QCD production" -with second-order electroweak coupling and second-order strong coupling O(α 2 em α 2 s ) (figure 1, right). Such processes can involve radiated gluons in the initial and/or final state ...

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Section: Fiducial Zγjj Cross-section Measurements In the Charged-leptmentioning

confidence: 99%

“…while the SM NLO prediction [48] Table 6. Summary of the main relative uncertainties in cross-section measurements presented in this paper.…”

Section: Fiducial Electroweak Production Cross-section Determinationmentioning

confidence: 99%

Section: Total Zγjj Fiducial Cross-section Measurementsmentioning

confidence: 99%

Section: Jhep07(2017)107mentioning

confidence: 99%

Section: Jhep07(2017)107mentioning

confidence: 99%

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Studies of Zγ production in association with a high-mass dijet system in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

Aaboud¹,

Aad²,

Abbott³

et al. 2017

J. High Energ. Phys.

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Diphoton production in vector-boson scattering at the LHC at next-to-leading order QCD

Campanario

Kerner

Ninh

et al. 2020

J. High Energ. Phys.

Self Cite

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In this paper, we present results at next-to-leading order (NLO) QCD for photon pair production in association with two jets via vector boson scattering within the Standard Model (SM), and also in an effective field theory framework with anomalous gauge coupling effects via bosonic dimension-6 and 8 operators. We observe that, compared to other processes in the class of two electroweak (EW) vector boson production in association with two jets, more exclusive cuts are needed in order to suppress the SM QCD-induced background channel. As expected, the NLO QCD corrections reduce the scale uncertainties considerably. Using a well-motivated dynamical scale choice, we find moderate K-factors for the EW-induced process while the QCD-induced channel receives much larger corrections. Furthermore, we observe that applying a cut of ∆φ cut j 2 γ 1 < 2.5 for the second hardest jet and the hardest photon helps to increase the signal significance and reduces the impact of higher-order QCD corrections.

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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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Zγ production in vector-boson scattering at next-to-leading order QCD

Cited by 9 publications

References 41 publications

Studies of Zγ production in association with a high-mass dijet system in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

Studies of Zγ production in association with a high-mass dijet system in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

Diphoton production in vector-boson scattering at the LHC at next-to-leading order QCD

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

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