Charm Production and QCD Analysis at HERA and LHC

Zenaiev, Oleksandr

doi:10.48550/arxiv.1612.02371

Cited by 4 publications

(5 citation statements)

References 215 publications

(560 reference statements)

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“…In the latter case, the small-x gluon is relevant both for the calculation of signal event rates, via the interaction cross-section between UHE neutrinos and target nucleons (ice or water), as well as for the calculation of the rates for the dominant background process, the production of charm quarks in cosmic ray collisions in the atmosphere which then decay into so-called 'prompt' neutrinos and which dominate the atmospheric neutrino flux at high energies. With this motivation, various groups have studied the impact of the LHCb charm measurements on the gluon PDF using different theoretical frameworks [26,27,396,397], as we discuss in more detail below.…”

Section: Charm Production In Pp Collisionsmentioning

confidence: 99%

“…( 62), y D ref is a specific rapidity bin chosen to normalize the absolute cross section measurements. As explained in [26,27,397,404], its value should be such that the results of the PDF fit are stable with respect to small variations of this choice. Thanks to these normalizations, scale variations are greatly reduced, and in particular it can be shown [27] that the entire set of LHCb D meson measurements at 5, 7 and 13 TeV can be satisfactorily described using NLO QCD theory, with a χ 2 per point of order 1.…”

Section: Theoretical Calculations and Toolsmentioning

confidence: 99%

See 1 more Smart Citation

The Structure of the Proton in the LHC Precision Era

Gao,

Harland-Lang,

Rojo

2017

Preprint

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We review recent progress in the determination of the parton distribution functions (PDFs) of the proton, with emphasis on the applications for precision phenomenology at the Large Hadron Collider (LHC). First of all, we introduce the general theoretical framework underlying the global QCD analysis of the quark and gluon internal structure of protons. We then present a detailed overview of the hard-scattering measurements, and the corresponding theory predictions, that are used in state-of-the-art PDF fits. We emphasize here the role that higher-order QCD and electroweak corrections play in the description of recent highprecision collider data. We present the methodology used to extract PDFs in global analyses, including the PDF parametrization strategy and the definition and propagation of PDF uncertainties. Then we review and compare the most recent releases from the various PDF fitting collaborations, highlighting their differences and similarities. We discuss the role that QED corrections and photon-initiated contributions play in modern PDF analysis. We provide representative examples of the implications of PDF fits for high-precision LHC phenomenological applications, such as Higgs coupling measurements and searches for high-mass New Physics resonances. We conclude this report by discussing some selected topics relevant for the future of PDF determinations, including the treatment of theoretical uncertainties, the connection with lattice QCD calculations, and the role of PDFs at future high-energy colliders beyond the LHC.

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Section: Charm Production In Pp Collisionsmentioning

confidence: 99%

Section: Theoretical Calculations and Toolsmentioning

confidence: 99%

The Structure of the Proton in the LHC Precision Era

Gao,

Harland-Lang,

Rojo

2017

Preprint

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“…Refs. [22][23][24] for reviews. On one hand, parton-level heavy-quark cross sections at fixed-flavour-number scheme (FFNS) [25][26][27] can be folded with phenomenological, scale-independent partonto-meson fragmentation functions (FFs), or the parton-level calculation is matched to a parton-shower [28,29] from a general-purpose Monte-Carlo event generator, such as Pythia 8 [30] or Herwig [31], and the showered event is then hadronized according to the hadronization model of the generator.…”

mentioning

confidence: 99%

Revisiting the D-meson hadroproduction in general-mass variable flavour number scheme

Helenius¹,

Paukkunen

2018

J. High Energ. Phys.

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We introduce a novel realization of the open heavy-flavour hadroproduction in general-mass variable flavour number scheme at next-to-leading order in perturbative QCD. The principal novelty with respect to the earlier works is in the treatment of smalltransverse-momentum limit, which has been a particularly challenging kinematic region in the past. We show that by a suitable choice of scheme, it is possible to obtain a wellbehaved description of the open heavy-flavour hadroproduction cross sections from zero up to asymptotically high transverse momentum. We contrast our calculation with the available D 0 -meson data as measured by the LHCb and ALICE collaborations at the LHC, finding a very good agreement within the theoretical and experimental uncertainties. We also compare our framework with other theoretical approaches.

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“…B:Three flavours + Heavy: The heavy quark contribution (charm and bottom) to relation between F L and F 2 is define by fixed-order number scheme using m c = 1.5 GeV and m b = 4.5 GeV [8]. The mass of these heavy quarks satisfies m Q ≫Λ QCD , and provides a hard scale for pQCD calculations.…”

Section: General Methodsmentioning

confidence: 99%

Longitudinal structure function from logarithmic slopes of F2 at low x

Boroun

2018

Phys. Rev. C

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Using Laplace transform techniques, I calculate the longitudinal structure function FL(x, Q 2 ) from the scaling violations of the proton structure function F2(x, Q 2 ), and make a critical study of this relationship between the structure functions at leading order (LO) up to next-to-next-to leading order (NNLO) analysis at small x. Furthermore, I consider heavy quark contributions to the relation between the structure functions, which leads to compact formula for N f = 3 + Heavy. The nonlinear corrections to the longitudinal structure function at LO up to NNLO analysis are shown in the N f = 4 (light quark flavor) based on the nonlinear corrections at R = 2 and R = 4 GeV −1 . The results are compared to experimental data of the longitudinal proton structure function FL in the range of 6.5 ≤ Q 2 ≤ 800 GeV 2 .

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Charm Production and QCD Analysis at HERA and LHC

Cited by 4 publications

References 215 publications

The Structure of the Proton in the LHC Precision Era

The Structure of the Proton in the LHC Precision Era

Revisiting the D-meson hadroproduction in general-mass variable flavour number scheme

Longitudinal structure function from logarithmic slopes of F2 at low x

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