Theoretical update of the charm structure function of the proton

Presti, N. A. Lo; Kawamura, Hiroyuki; Vogt, A.; Moch, S.; Khemchandani, Kanchan; Nagahiro, Hideko; Nawa, Kanabu

doi:10.1063/1.3647436

Cited by 6 publications

(14 citation statements)

References 10 publications

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“…For NC heavy-quark production the convolution of the coefficient functions (especially C 2,g ) and the gluon density is dominated by rather low partonic of-mass energies s and the corresponding soft logarithms in β = (1 − 4m 2 /s) 1/2 at NNLO have recently been completely determined [4]. In our description of the NC structure functions F k (which supersedes our earlier studies [19]) we include these latest improvements [4] together with complete dependence on the renormalization and factorization scales, see e.g. [9,18].…”

Section: Heavy-quark Dis In Perturbative Qcdmentioning

confidence: 99%

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Heavy-quark deep-inelastic scattering with a running mass

2011

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We study the production of heavy quarks in deep-inelastic scattering within perturbative QCD. As a novelty, we employ for the first time the running mass definition in the MS scheme for deep-inelastic charm and bottom production. We observe an improved stability of the perturbative expansion and a reduced theoretical uncertainty due to variations of the renormalization and factorization scales. As our best estimate we extract from a global fit to fixed-target and HERA collider data for the charm-quark an MS mass of m c (m c ) = 1.01 ± 0.09 (exp) ± 0.03 (th) GeV.1

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Section: Heavy-quark Dis In Perturbative Qcdmentioning

confidence: 99%

“…(15) uses the threshold enhanced terms of Ref. [4] to estimate the dominant corrections at two loops. All explicit dependence on the renormalization and factorization scales and the terms accounting for the scheme transformation from the pole to the running mass at NNLO are, however, exact in Eq.…”

Section: Heavy-quark Dis In Perturbative Qcdmentioning

confidence: 99%

Heavy-quark deep-inelastic scattering with a running mass

2011

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Section: The Massive Nnlo Corrections and The Running Massmentioning

confidence: 99%

“…1.15. Here one uses the Wilson coefficients to NLO and refers to the approximate result valid in the threshold region [121,122,123] to give an estimate for the NNLO value, see Ref. [124].…”

Section: The Massive Nnlo Corrections and The Running Massmentioning

confidence: 99%

“…In particular, near the production threshold s ≃ 4m 2 h , where large Sudakov double logarithms α k s ln 2k (1 − 4m 2 h /s) dominate at each order, one may wish to apply resummations; see Refs. [121,122,123] for details.Another aspect at higher orders concerns the definition of the heavy quark mass, since it is a scheme dependent quantity. It is of particular interest to investigate which choice of scheme leads to the best convergence of the perturbative series.…”

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Gluons and the quark sea at high energies: distributions, polarization, tomography

Boer¹,

Diehl²,

Milner³

et al. 2011

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ForewordThe study of the fundamental structure of nuclear matter is a central thrust of physics research in the United States. As indicated in Frontiers of Nuclear Science, the 2007 Nuclear Science Advisory Committee long range plan, consideration of a future Electron-Ion Collider (EIC) is a priority and will likely be a significant focus of discussion at the next long range plan. We are therefore pleased to have supported the ten week program in fall 2010 at the Institute of Nuclear Theory which examined at length the science case for the EIC. This program was a major effort; it attracted the maximum allowable attendance over ten weeks.This report summarizes the current understanding of the physics and articulates important open questions that can be addressed by an EIC. It converges towards a set of "golden" experiments that illustrate both the science reach and the technical demands on such a facility, and thereby establishes a firm ground from which to launch the next phase in preparation for the upcoming long range plan discussions. We thank all the participants in this productive program. In particular, we would like to acknowledge the leadership and dedication of the five co-organizers of the program who are also the co-editors of this report.David Kaplan, Director, National Institute for Nuclear Theory Hugh Montgomery, Director, Thomas Jefferson National Accelerator Facility Steven Vigdor, Associate Lab Director, Brookhaven National Laboratory iii Preface This volume is based on a ten-week program on "Gluons and the quark sea at high energies", which took place at the Institute for Nuclear Theory (INT) in Seattle from September 13 to November 19, 2010. The principal aim of the program was to develop and sharpen the science case for an Electron-Ion Collider (EIC), a facility that will be able to collide electrons and positrons with polarized protons and with light to heavy nuclei at high energies, offering unprecedented possibilities for in-depth studies of quantum chromodynamics. Guiding questions were• What are the crucial science issues?• How do they fit within the overall goals for nuclear physics?• Why can't they be addressed adequately at existing facilities?• Will they still be interesting in the 2020's, when a suitable facility might be realized?The program started with a five-day workshop on "Perturbative and Non-Perturbative Aspects of QCD at Collider Energies", which was followed by eight weeks of regular program and a concluding four-day workshop on "The Science Case for an EIC".More than 120 theorists and experimentalists took part in the program over ten weeks. It was only possible to smoothly accommodate such a large number of participants because of the extraordinary efforts of the INT staff, to whom we extend our warm thanks and appreciation. We thank the INT Director, David Kaplan, for his strong support of the program and for covering a significant portion of the costs for printing this volume. We gratefully acknowledge additional financial support provided by BNL and JLab.The program w...

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On the next-to-next-to-leading order QCD corrections to heavy-quark production in deep-inelastic scattering

et al. 2012

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The contribution of quarks with masses m Λ QCD is the only part of the structure functions in deepinelastic scattering (DIS) which is not yet known at the next-to-next-to-leading order (NNLO) of perturbative QCD. We present improved partial NNLO results for the most important structure function F 2 (x, Q 2 ) near the partonic threshold, in the high-energy (small-x) limit and at high scales Q 2 m 2 ; and employ these results to construct approximations for the gluon and quark coefficient functions which cover the full kinematic plane. The approximation uncertainties are carefully investigated, and found to be large only at very small values, x 10 −3 , of the Bjorken variable.

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Theoretical update of the charm structure function of the proton

Cited by 6 publications

References 10 publications

Heavy-quark deep-inelastic scattering with a running mass

Heavy-quark deep-inelastic scattering with a running mass

Gluons and the quark sea at high energies: distributions, polarization, tomography

On the next-to-next-to-leading order QCD corrections to heavy-quark production in deep-inelastic scattering

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