SM theory for collider physics

Anastasiou, Charalampos

doi:10.22323/1.084.0007

Cited by 15 publications

(25 citation statements)

References 35 publications

(39 reference statements)

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“…[230]. This has motivated systematic theory improvements in the effective theory to NNLO [231][232][233] and even to N 3 LO accuracy [234,235], by taking the limit of a large top-quark mass (m t → ∞) and integrating out the top-quark loop, while keeping the full m t dependence in the Born cross section. The recent N 3 LO results [234,235] demonstrate an apparent, if slow, convergence of the perturbative expansion.…”

Section: B Benchmark Cross Sections At the Lhcmentioning

confidence: 99%

“…In this situation, with perturbative QCD predictions of unprecedented accuracy for the hard scattering process being available, the largest remaining sources of uncertainties are the input value for the strong coupling constant α s and the PDFs. Indeed, the spread in the inclusive cross sections σ(H) NNLO of SM Higgs boson production at the LHC at NNLO [231][232][233] predicted by the PDF sets CJ15 [6], CT14 [7], HERAPDF2.0 [4], JR14 [8], MMHT14 [9], and NNPDF3.0 [10] amounts to 13% as documented in Ref. [11].…”

Section: B Benchmark Cross Sections At the Lhcmentioning

confidence: 99%

See 1 more Smart Citation

Parton distribution functions, αs , and heavy-quark masses for LHC Run II

et al. 2017

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We determine a new set of parton distribution functions (ABMP16), the strong coupling constant α s and the quark masses m c , m b and m t in a global fit to next-to-next-to-leading order (NNLO) in QCD. The analysis uses the MS scheme for α s and all quark masses and is performed in the fixed-flavor number scheme for n f = 3, 4, 5. Essential new elements of the fit are the combined data from HERA for inclusive deep-inelastic scattering (DIS), data from the fixed-target experiments NOMAD and CHORUS for neutrino-induced DIS, and data from Tevatron and the LHC for the Drell-Yan process and the hadro-production of single-top and top-quark pairs. The theory predictions include new improved approximations at NNLO for the production of heavy quarks in DIS and for the hadro-production of single-top quarks. The description of higher twist effects relevant beyond the leading twist collinear factorization approximation is refined. At NNLO we obtain the value α (n f =5) s (M Z ) = 0.1147 ± 0.0008.

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Section: B Benchmark Cross Sections At the Lhcmentioning

confidence: 99%

Section: B Benchmark Cross Sections At the Lhcmentioning

confidence: 99%

Parton distribution functions, αs , and heavy-quark masses for LHC Run II

et al. 2017

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“…To compute production through gluon fusion and bb annihilation, we take the SM cross sections and multiply them with the effective couplings obtained from NMSSMTools. The SM values are calculated with SusHi [96,97] and include in gluon fusion the NLO corrections with the full top quark mass dependence [98] as well as the next-to-next-to-leading order (NNLO) corrections in the heavy quark effective theory [99][100][101][102][103]. The next-to-next-to-next-to-leading order (N 3 LO) corrections are taken into account in a threshold expansion [104][105][106][107] for Higgs masses below 300 GeV.…”

Section: B the Nmssm Scanmentioning

confidence: 99%

Showcasing HH production: Benchmarks for the LHC and HL-LHC

et al. 2019

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Current projections suggest that the LHC will have only limited sensitivity to di-Higgs production in the Standard Model (SM), possibly even after the completion of its high luminosity phase. Multi-Higgs final states play a fundamental role in many extensions of the SM as they are intrinsically sensitive to modifications of the Higgs sector. Therefore, any new observation in multi-Higgs final states could be linked to a range of beyond the SM (BSM) phenomena that are not sufficiently addressed by the SM. Extensions of the Higgs sector typically lead to new phenomenological signatures in multi-Higgs final states that are vastly different from the SM expectation. In this work, we provide a range of signature-driven benchmark points for resonant and non-resonant BSM di-Higgs production that motivate non-SM kinematic correlations and multi-fermion discovery channels. Relying on theoretically well-motivated assumptions, special attention is devoted to the particular case where the presence of new physics will dominantly manifest itself in multi-Higgs final states. * Electronic address: philipp.basler@kit.edu † Electronic address: dawson@bnl.gov ‡ Electronic address: christoph.englert@glasgow.ac.uk § Electronic address: milada.muehlleitner@kit.edu * A recent summary of higher-order corrections to Higgs pair production can be found in [17].

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“…Then, we employ the method of differential equations [40,[46][47][48][49] to compute the MIs, for both the pure virtual and real emission corrections. In the latter case, the phase-space delta functions are dealt with via the reverse unitarity technique [50,51], which is based on the observation that the replacement known as Cutkowsky rule holds in terms of distributions:…”

Section: Computational Detailsmentioning

confidence: 99%

NNLO QCD×EW corrections to Z production in the qq¯
Bonciani
¹
,
Buccioni²,
Rana
³

et al. 2020
Phys. Rev. D
43
0
28
0
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We present the first results for the O(ααs) corrections to the total partonic cross section of the process qq → Z + X, with the complete set of contributions, that include photonic and massive weak gauge boson effects. The results are relevant for the precise determination of the hadronic Z boson production cross section. Virtual and real corrections are calculated analytically using the reduction to the master integrals and their evaluation through differential equations. Real corrections are dealt with using the reverse-unitarity method. They require the evaluation of a new set of two-loop master integrals, with up to three internal massive lines. In particular, three of them are expressed in terms of elliptic integrals. We verify the absence, at this perturbative order, of initial state mass singularities proportional to a weak massive virtual correction to the quark-gluon splitting.

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SM theory for collider physics

Abstract: In this talk we review some of the latest theoretical developments in Standard Model collider physics.

Cited by 15 publications

References 35 publications

Parton distribution functions, αs , and heavy-quark masses for LHC Run II

Parton distribution functions, αs , and heavy-quark masses for LHC Run II

Showcasing HH production: Benchmarks for the LHC and HL-LHC

NNLO QCD×EW corrections to Z production in the qq¯
Bonciani
¹
,
Buccioni²,
Rana
³

et al. 2020
Phys. Rev. D
43
0
28
0
View full text Add to dashboard Cite

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SM theory for collider physics

Abstract: In this talk we review some of the latest theoretical developments in Standard Model collider physics.

Cited by 15 publications

References 35 publications

Parton distribution functions, αs , and heavy-quark masses for LHC Run II

Parton distribution functions, αs , and heavy-quark masses for LHC Run II

Showcasing HH production: Benchmarks for the LHC and HL-LHC

NNLO QCD×EW corrections to Z production in the qq¯Bonciani1, Buccioni2, Rana3 et al. 2020Phys. Rev. D430280View full textAdd to dashboardCite

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About

NNLO QCD×EW corrections to Z production in the qq¯
Bonciani
¹
,
Buccioni²,
Rana
³

et al. 2020
Phys. Rev. D
43
0
28
0
View full text Add to dashboard Cite