Hadronic top-quark pair production with NNLL threshold resummation

Beneke, Μ.; Falgari, Pietro; Klein, Sebastian; Schwinn, Christian

doi:10.1016/j.nuclphysb.2011.10.021

Cited by 307 publications

(388 citation statements)

References 87 publications

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“…We obtain the approximate NNLO corrections from the perturbative information contained in a soft-gluon resummation formula valid to next-to-next-to-leading logarithmic (NNLL) accuracy. The derivation of this formula is based on the soft-collinear effective theory (SCET) methods 1 used to study differential top-quark pair production (tt) cross sections at NNLL in [15,17,18] (see [19][20][21][22] for SCET-based studies of the total tt cross section). In fact, since both tt and ttH production contain four colored partons, the study of soft-gluon corrections to these processes is conceptually identical and differs only because of the underlying kinematics.…”

Section: Jhep03(2016)124mentioning

confidence: 99%

Associated production of a top pair and a Higgs boson beyond NLO

Broggio

Ferroglia

Pecjak³

et al. 2016

J. High Energ. Phys.

119

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We consider soft gluon emission corrections to the production of a top-antitop pair in association with a Higgs boson at hadron colliders. In particular, we present a softgluon resummation formula for this production process and gather all elements needed to evaluate it at next-to-next-to-leading logarithmic order. We employ these results to obtain approximate next-to-next-to-leading order (NNLO) formulas, and implement them in a bespoke parton-level Monte Carlo program which can be used to calculate the total cross section along with arbitrary differential distributions. We use this tool to study the phenomenological impact of the approximate NNLO corrections, finding that they increase the total cross section and the differential distributions which we evaluated in this work.

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Section: Jhep03(2016)124mentioning

confidence: 99%

Associated production of a top pair and a Higgs boson beyond NLO

Broggio

Ferroglia

Pecjak³

et al. 2016

J. High Energ. Phys.

119

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“…A number of phenomenological studies have been presented in the literature [9][10][11][12][13][14][15][16][17]. Critical comparisons of the various approaches can be found in refs.…”

Section: Introductionmentioning

confidence: 99%

NNLO corrections to top-pair production at hadron colliders: the all-fermionic scattering channels

Czakon

Mitov

2012

J. High Energ. Phys.

445

351

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This is a second paper in our ongoing calculation of the next-to-next-to-leading order (NNLO) QCD correction to the total inclusive top-pair production cross-section at hadron colliders. In this paper we calculate the reaction qq → tt + qq which was not considered in our previous work on qq → tt + X [1] due to its phenomenologically negligible size. We also calculate all remaining fermion-pair-initiated partonic channels qq ′ , qq ′ and qq that contribute to top-pair production starting from NNLO. The contributions of these reactions to the total cross-section for top-pair production at the Tevatron and LHC are small, at the permil level. The most interesting feature of these reactions is their characteristic logarithmic rise in the high energy limit. We compute the constant term in the leading power behavior in this limit, and achieve precision that is an order of magnitude better than the precision of a recent theoretical prediction for this constant. All four partonic reactions computed in this paper are included in our numerical program Top++. The calculation of the NNLO corrections to the two remaining partonic reactions, qg → tt + X and gg → tt + X, is ongoing.

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“…The solution is to resum these terms. For top pair production the resummation has been carried with nextto-next-to-leading logarithmic (NNLL) accuracy [43][44][45][46][47][48]. The resummed results can be re-expanded and give an "approximate NNLO" result [46,[49][50][51][52].…”

Section: Top Pair Productionmentioning

confidence: 99%

Theoretical overview on top pair production and single top production

Weinzierl

2012

EPJ Web of Conferences

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Abstract. In this talk I will give an overview on theoretical aspects of top quark physics. The focus lies on top pair production and single top production. Basic facts about the top quarkThe top quark is the heaviest elementary particle known up to today. It has been discovered at the Tevatron and it is currently studied at the LHC. The top quark can be characterised by three essential numbers. These are the top quark mass, the top quark width and the branching ratio for the decay into a bottom quark. The current experimentally measured values are [1]The first number tells us that the top quark is heavier than all other known elementary particles, from the second one we deduce that the lifetime of the top quark is shorter than the characteristic hadronisation time scale. The third number indicates that the top quark decays predominately into a bottom quark and a W-boson. These numbers have several implications: The top quark mass is close to the electroweak symmetry breaking scale v = 246 GeV. If there is new physics associated with electro-weak symmetry breaking, top quark physics is a place to look for. Secondly, the large top mass sets a hard scale. The short lifetime of the top quark implies that the top quark decays before it can form bound states. Therefore, top quark physics is described by perturbative QCD. The absence of hadronisation effects allows also that spin information of the top quark is transferred to its decay products. Finally, the large top mass implies also that the top quark contributions are relevant to precision physics. For example, the top gives a significant contribution to the Higgs self-energy and a precise knowledge of the top mass is required for an indirect determination of the Higgs mass from electro-weak precision fits. This raises immediately the question how precise the top quark mass can be extracted from experiments. There are some theoretical subtleties which should be taken into account. The starting point for a theoretical description is the Lagrange density, the relevant part reads It should be stressed that Z m and hence m renorm depend on the renormalisation scheme. Popular choices for a renormalisation scheme are the on-shell scheme, where the the mass m pole is defined as the pole of the propagator (and m pole is therefore called the pole mass), or the MS-scheme, in which the MS-mass m MS (µ) is scale-dependent. Within perturbation theory one can convert between the different schemes. Naively, the pole mass seems to be the natural choice. However, the exact definition of the pole mass assumes the concept of stable colour-less particle. The top quark is neither stable nor colour-less, and this re-introduces non-perturbative effects. As a result, the pole mass is ambiguous by an amount O Λ QCD [2][3][4][5]. This ambiguity limits the precision by which the pole mass can be extracted from experiment. As an alternative one can use a mass definition, which is only sensitive to short distances. The MS-mass m MS (µ) is an example of a short-distance mass. The direct extrac...

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Hadronic top-quark pair production with NNLL threshold resummation

Cited by 307 publications

References 87 publications

Associated production of a top pair and a Higgs boson beyond NLO

Associated production of a top pair and a Higgs boson beyond NLO

NNLO corrections to top-pair production at hadron colliders: the all-fermionic scattering channels

Theoretical overview on top pair production and single top production

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