Higher-order power corrections in a transverse-momentum cut for colour-singlet production at NLO

Cieri, Leandro; Oleari, C.; Rocco, Marco

doi:10.1140/epjc/s10052-019-7361-8

Cited by 46 publications

(66 citation statements)

References 69 publications

(130 reference statements)

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“…The power suppressed contributions to the next-to-leading order (NLO) total cross section have been explicitly evaluated in Refs. [28,29]. In the case of heavyquark production the r cut dependence is found to be linear [25,26,30], and it is an interesting question to investigate the origin of this peculiar behavior.…”

Section: Introductionmentioning

confidence: 99%

The $$q_T$$ subtraction method: electroweak corrections and power suppressed contributions

2020

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Building upon the formulation of transverse-momentum resummation for heavy-quark hadroproduction, we present the first application of the q T subtraction formalism to the computation of electroweak corrections to massive lepton pairs through the Drell-Yan mechanism. We then study the power suppressed contributions to the q T subtraction formula in the parameter r cut , defined as the minimum transverse momentum of the lepton pair normalised to its invariant mass. We analytically compute the leading power correction from initial and final-state radiation to the inclusive cross section. In the case of initial-state radiation the power correction is quadratic in r cut and our analytic result is consistent with results previously obtained in the literature. Finalstate radiation produces linear contributions in r cut that may challenge the efficiency of the q T subtraction procedure. We explicitly compute the linear power correction in the case of the inclusive cross section and we discuss the extension of our calculation to differential distributions.

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Section: Introductionmentioning

confidence: 99%

The $$q_T$$ subtraction method: electroweak corrections and power suppressed contributions

2020

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“…Since the kinematics of these terms is equivalent to the one discussed in Ref. [38], we follow the same procedure described in its Appendix A (in particular Eqs. (A.16)-(A.20)), and we integrate all the terms proportional to δ(s 2 ) in Eq.…”

Section: The Partonic Differential Cross Sectionsmentioning

confidence: 99%

“…In Ref. [38], we presented a method to compute the power corrections at all orders, for the inclusive production of a colourless final-state system, at NLO in QCD. Recently, the leading power corrections for the electroweak NLO corrections to the inclusive cross section for the production of a massive lepton pair through the Drell-Yan mechanism have been computed in Ref.…”

Section: Introductionmentioning

confidence: 99%

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Power corrections in a transverse-momentum cut for vector-boson production at NNLO: the qg-initiated real-virtual contribution

Oleari

Rocco

2021

Eur. Phys. J. C

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We consider the production of a vector boson (Z, $$W^\pm $$ W ± or $$\gamma ^*$$ γ ∗ ) at next-to-next-to-leading order in the strong coupling constant $$\alpha _\mathrm{S}$$ α S . We impose a transverse-momentum cutoff, $$q_{\mathrm{T}}^{\mathrm{cut}}$$ q T cut , on the vector boson produced in the qg-initiated channel. We then compute the power corrections in the cutoff, up to the second power, of the real-virtual interference contribution to the cumulative cross section at order $$\alpha _\mathrm{S}^2$$ α S 2 . Other terms with the same kinematics, originating from the subtraction method applied to the double-real contribution, have been also considered. The knowledge of such power corrections is a required ingredient in order to reduce the dependence on the transverse-momentum cutoff of the QCD cross sections at next-to-next-to-leading order, when the $$q_{\mathrm{T}}$$ q T -subtraction method is applied. In addition, the study of the dependence of the cross section on $$q_{\mathrm{T}}^{\mathrm{cut}}$$ q T cut allows as well for an understanding of its behaviour in the small transverse-momentum limit, giving hints on the structure at all orders in $$\alpha _\mathrm{S}$$ α S and on the identification of universal patterns. Our result are presented in an analytic form, using the process-independent procedure described in a previous paper for the calculation of the all-order power corrections in $$q_{\mathrm{T}}^{\mathrm{cut}}$$ q T cut .

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“…Although subleading, the increasing precision of both LP resummation and of experimental data makes such terms numerically relevant. Significant progress towards understanding NLP corrections is being made [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29], and a resummation of them at LL in processes where only soft real radiation is present is achieved [30,31,32].…”

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confidence: 99%

The role of soft quarks in next-to-leading power threshold effects

Beekveld¹,

Beenakker²,

Laenen³

et al. 2019

Proceedings of 14th International Symposium on Radiative Corrections — PoS(RADCOR2019)

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Cross sections in perturbative QCD are plagued by large corrections from soft and collinear radiation. The most singular terms are known to be universal, which allows their resummation to all orders in the coupling. In our work, we have examined the structure of the next-to-singular contributions, which can originate from the emission of both soft quarks and gluons. We show that we can derive a next-to-soft amplitude for both types of emissions. The numerical impact of these contributions on the transverse momentum distribution of the single-photon production process are also discussed.

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Higher-order power corrections in a transverse-momentum cut for colour-singlet production at NLO

Cited by 46 publications

References 69 publications

The $$q_T$$ subtraction method: electroweak corrections and power suppressed contributions

The $$q_T$$ subtraction method: electroweak corrections and power suppressed contributions

Power corrections in a transverse-momentum cut for vector-boson production at NNLO: the qg-initiated real-virtual contribution

The role of soft quarks in next-to-leading power threshold effects

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