High-energy resummation of direct photon production at hadronic colliders

Diana, Giovanni; Rojo, Juan; Ball, Richard D.

doi:10.1016/j.physletb.2010.08.063

Cited by 16 publications

(19 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The source of such a disagreement, which is about a 2σ effect in the case of D∅, is unclear. Theoretically, the inclusion of small-x resummation effects [39] does not help to improve the data-NLO agreement. T , BFG-II) predictions for three PDFs: CTEQ6.6, MSTW08 and NNPDF1.2.…”

Section: A Parton Distribution Functions Dependencementioning

confidence: 95%

Sensitivity of isolated photon production at TeV hadron colliders to the gluon distribution in the proton

Ichou

d’Enterria

2010

Phys. Rev. D

View full text Add to dashboard Cite

We compare the single inclusive spectra of isolated photons measured at high transverse energy in proton-antiproton collisions at √ s = 1.96 TeV with next-to-leading order perturbative QCD predictions with various parametrizations of the parton distribution functions (PDFs). Within the experimental and theoretical uncertainties, the Tevatron data can be reproduced equally well by the recent CTEQ6.6, MSTW08 and NNPDF1.2 PDF sets. We present also the predictions for isolated γ spectra in proton-proton collisions at √ s = 14 TeV for central (y = 0) and forward (y = 4) rapidities relevant for LHC experiments. Different proton PDFs result in maximum variations of order ±30% in the expected E γ T -differential isolated γ cross sections. The inclusion of the isolated photon data in global PDF fits will place extra independent constraints on the gluon density.

show abstract

Section: A Parton Distribution Functions Dependencementioning

confidence: 95%

Sensitivity of isolated photon production at TeV hadron colliders to the gluon distribution in the proton

Ichou

d’Enterria

2010

Phys. Rev. D

View full text Add to dashboard Cite

show abstract

“…The resummation relies on the resummation of the splitting function, which must then be combined with a computation of the hard cross-section with incoming off-shell gluons. Such calculations have been made for a range of processes: heavy quark production [100,101,107,108], DIS structure functions [103,109,110], Drell-Yan production [111,112], direct photon production [113,114] and Higgs production [115][116][117]. The use of these expressions to resum coefficient functions at fixed coupling is straightforward, but becomes more complicated when the coupling runs, due to the presence of anti-collinear singularities.…”

Section: )mentioning

confidence: 99%

Parton distributions with small-x resummation: evidence for BFKL dynamics in HERA data

et al. 2018

Self Cite

View full text Add to dashboard Cite

We present a determination of the parton distribution functions of the proton in which NLO and NNLO fixed-order calculations are supplemented by NLLx smallx resummation. Deep-inelastic structure functions are computed consistently at NLO+NLLx or NNLO+NLLx, while for hadronic processes small-x resummation is included only in the PDF evolution, with kinematic cuts introduced to ensure the fitted data lie in a region where the fixed-order calculation of the hard cross-sections is reliable. In all other respects, the fits use the same methodology and are based on the same global dataset as the recent NNPDF3.1 analysis. We demonstrate that the inclusion of small-x resummation leads to a quantitative improvement in the perturbative description of the HERA inclusive and charm-production reduced crosssections in the small x region. The impact of the resummation in our fits is greater at NNLO than at NLO, because fixedorder calculations have a perturbative instability at small x due to large logarithms that can be cured by resummation. We explore the phenomenological implications of PDF sets with small-x resummation for the longitudinal structure function F L at HERA, for parton luminosities and LHC benchmark cross-sections, for ultra-high-energy neutrino-nucleus crosssections, and for future high-energy lepton-proton colliders such as the LHeC.

show abstract

“…The resummation of partonic coefficient functions is based on the so-called k t -factorization theorem [62,[73][74][75][76][77][78][79] and it is known to LLx for an increasing number of cross-sections and distributions [80][81][82][83][84][85][86]. Its generalization to rapidity distributions was carried out in Refs [79], where it was applied to the case of Higgs production in gluon fusion.…”

Section: A Recap Of Small-x Resummationmentioning

confidence: 99%

“…Because we are interested in the Q T spectrum, we find more useful to organize the calculation of the phase-space integrals following the case of direct photon production [85,97]. Therefore, we use the first δ function in Eq.…”

Section: Acknowledgmentsmentioning

confidence: 99%

CombiningQTand small-xresummations

Marzani

2016

Phys. Rev. D

View full text Add to dashboard Cite

We analyze transverse momentum (QT ) resummation of a colorless final state, e.g. Higgs production in gluon fusion or the production of a lepton pair via the Drell-Yan mechanism, in the limit where the invariant mass of the final state is much less then the center-of-mass energy, i.e. Q 2 ≪ s. We show how the traditional resummation of logarithms of QT /Q can be supplemented with the resummation of the leading logarithmic contributions at small x = Q 2 /s and we compute the necessary ingredients to perform such joint resummation.

show abstract

High-energy resummation of direct photon production at hadronic colliders

Cited by 16 publications

References 50 publications

Sensitivity of isolated photon production at TeV hadron colliders to the gluon distribution in the proton

Sensitivity of isolated photon production at TeV hadron colliders to the gluon distribution in the proton

Parton distributions with small-x resummation: evidence for BFKL dynamics in HERA data

CombiningQTand small-xresummations

Contact Info

Product

Resources

About