Azimuthal dependence of the heavy quark initiated contributions to DIS

Ananikyan, L. N.; Ivanov, N. Ya.

doi:10.1103/physrevd.75.014010

Cited by 17 publications

(28 citation statements)

References 47 publications

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“…An obvious candidate would be c and b production data from HERA; but these are already included in the analysis, and they don't have very much effect because the errors are rather large and because the data are mostly at small x where the dominant partonic subprocess is γg → cc rather than γc → cX. It may be possible to probe the subprocess γc → cX more effectively by measuring specific angular differential distributions-see [22].…”

Section: Summary and Implicationsmentioning

confidence: 99%

Charm parton content of the nucleon

2007

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We investigate the charm sector of the nucleon structure phenomenologically, using the most up-to-date global QCD analysis. Going beyond the common assumption of purely radiatively generated charm, we explore possible degrees of freedom in the parton parameter space associated with nonperturbative (intrinsic) charm in the nucleon. Specifically, we explore the limits that can be placed on the intrinsic charm (IC) component, using all relevant hard-scattering data, according to scenarios in which the IC has a form predicted by light-cone wave function models; or a form similar to the light sea-quark distributions. We find that the range of IC is constrained to be from zero (no IC) to a level 2-3 times larger than previous model estimates. The behaviors of typical charm distributions within this range are described, and their implications for hadron collider phenomenology are briefly discussed. *

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Section: Summary and Implicationsmentioning

confidence: 99%

Charm parton content of the nucleon

2007

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“…However, in Ref. [23] the NLO corrections to the cos 2ϕ-asymmetry have been estimated within the so-called soft-gluon approximation at Q 2 m…”

Section: Resummation For Azimuthal Asymmetrymentioning

confidence: 99%

“…At the same b For more details, see Refs. [23,26]. c Note that we convolve the NLO CTEQ6M distribution functions with both the LO and NLO partonic cross sections that makes it possible to estimate directly the degree of stability of the FFNS predictions under radiative corrections.…”

Section: Resummation For F 2 and Callan-gross Ratiomentioning

confidence: 99%

“…[19][20][21][22][23][24], where the azimuthal cos(2ϕ) asymmetry and Callan-Gross ratio R(x, Q 2 ) = F L /F T in heavy quark leptoproduction were analyzed. a It was shown that, contrary to the production cross sections, the azimuthal asymmetry 20,22 and Callan-Gross ratio 24 in heavy flavor leptoproduction are stable within the FFNS, both parametrically and perturbatively.…”

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confidence: 99%

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How to Measure the Charm Density in the Proton at Eic

Ivanov¹

2011

Exclusive Reactions at High Momentum Transfer IV

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We study two experimental ways to measure the heavy-quark content of the proton: using the Callan-Gross ratio R(x, Q 2 ) = F L /F T and/or the azimuthal cos(2ϕ) asymmetry in deep inelastic lepton-nucleon scattering. Our approach is based on the following observations. First, unlike the production cross sections, the ratio R(x, Q 2 ) = F L /F T and the azimuthal cos(2ϕ) asymmetry in heavy-quark leptoproduction are sufficiently stable, both parametricallly and perturbatively, in a wide region of variables x and Q 2 within the fixed-flavornumber scheme of QCD. Second, both these quantities, R(x, Q 2 ) = F L /F T and cos(2ϕ) asymmetry, are sensitive to resummation of the mass logarithms of the type αs ln Q 2 /m 2 within the variable-flavor-number schemes. These two facts together imply that the heavy-quark densities in the nucleon can, in principle, be determined from high-Q 2 data on the Callan-Gross ratio and/or the azimuthal asymmetry in heavy-quark leptoproduction. In particular, the charm content of the proton can be measured in future studies at the proposed Large Hadron-Electron (LHeC) and Electron-Ion (EIC) Colliders.

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“…For this reason, it is of special interest to study those observables that are well-defined in QCD. Nontrivial examples of such observables were proposed in [19][20][21][22][23][24][25], where the azimuthal cos(2ϕ) asymmetry and Callan-Gross ratio R(x, Q 2 ) = F L /F T in heavy quark leptoproduction were analyzed (note also the paper [26] where the perturbative stability of the QCD predictions for the charge asymmetry in t-quark hadroproduction has been observed). It was shown that, contrary to the production cross sections, the azimuthal asymmetry [20,22] and the Callan-Gross ratio [25] in heavy flavor leptoproduction are stable within the FFNS, both parametrically and perturbatively.…”

Section: Introductionmentioning

confidence: 99%

Azimuthal asymmetry and ratio R = F L /F T as probes of the charm content of the proton

Ivanov

2012

J. Contemp. Phys.

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We study two experimental ways to measure the heavy-quark content of the proton: using the Callan-Gross ratio R(x, Q 2 ) = FL/FT and/or azimuthal cos(2ϕ) asymmetry in deep inelastic leptonnucleon scattering. Our approach is based on the perturbative stability of the QCD predictions for these two quantities. We resume the mass logarithms of the type αs ln Q 2 /m 2 and conclude that heavy-quark densities in the nucleon can, in principle, be determined from data on the CallanGross ratio and/or azimuthal asymmetry. In particular, the charm content of the proton can be measured in future studies at the proposed Large HadronElectron (LHeC) and ElectronIon (EIC) Colliders.

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Azimuthal dependence of the heavy quark initiated contributions to DIS

Cited by 17 publications

References 47 publications

Charm parton content of the nucleon

Charm parton content of the nucleon

How to Measure the Charm Density in the Proton at Eic

Azimuthal asymmetry and ratio R = F L /F T as probes of the charm content of the proton

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