Q2-evolution of parton densities at small x values and H1 and ZEUS experimental data

Kotikov, A. V.; Shaikhatdenov, B. G.

doi:10.1063/1.4891128

Cited by 5 publications

(2 citation statements)

References 26 publications

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“…The generalized DAS approach has been successfully used to fit the experimental data for F 2 and F c 2 SFs (see Refs. [52,[55][56][57][58][59][60][61][62], respectively). In addition, it helps to extract gluon density and F L SF from experimental data of F 2 and its derivative with respect to Q 2 (see [63,64] and [65][66][67], respectively), to estimate the charm part of F L [68] and, finally, it leads to useful links between SFs [69][70][71].…”

Section: Singlet Partmentioning

confidence: 99%

Parametrizations of Collinear and kT-Dependent Parton Densities in Proton

2022

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A new type of parametrization for parton distribution functions in the proton, based on their Q2-evolution at large and small x values, is constructed. In our analysis, the valence and nonsinglet parts obey the Gross–Llewellyn–Smith and Gottfried sum rules, respectively. For the singlet quark and gluon densities, momentum conservation is taken into account. Then, using the Kimber–Martin–Ryskin prescription, we extend the consideration to Transverse Momentum Dependent (TMD, or unintegrated) gluon and quark distributions in the proton, which currently plays an important role in a the number of phenomenological applications. The analytical expressions for the latter, valid for both low and large x, are derived for the first time.

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Section: Singlet Partmentioning

confidence: 99%

Parametrizations of Collinear and kT-Dependent Parton Densities in Proton

2022

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“…In Refs. [12,80,81,[87][88][89] this information is used to analyze the behavior of effective QCD constants at low Q 2 .…”

Section: First Moments Of Spin Structure Functionsmentioning

confidence: 99%

Nonperturbative region of effective strong coupling

Andreev

2013

Preprint

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In the framework of Poincaré covariant quark model the behavior of running coupling constant α s Q 2 is considered in Q < 1 GeV region. An analysis was carried out for pseudoscalar and vector mesons with lepton decay constants, masses (obtained from model dependent) and nucleon spin rules required to match their experimental counterparts.Possible behavior of α s with α crit. = α s Q 2 = 0 ∼ 0.65 − 0.72 in the case of a frozen regime, which follows from experimental values of lepton decay constant, masses and nucleon spin rules are discussed.

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Average gluon and quark jet multiplicities

Kotikov¹

2016

AIP Conference Proceedings

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Abstract. We show the results in [1,2] for computing the QCD contributions to the scale evolution of average gluon and quark jet multiplicities. The new results came due a recent progress in timelike small-x resummation obtained in the MS factorization scheme. They depend on two nonperturbative parameters with clear and simple physical interpretations. A global fit of these two quantities to all available experimental data sets demonstrates by its goodness how our results solve a longstandig problem of QCD. Including all the available theoretical input within our approach, α (5) s (M z ) = 0.1199 ± 0.0026 has been obtained in the MS scheme in an approximation equivalent to next-to-next-to-leading order enhanced by the resummations of ln x terms through the NNLL level and of ln Q 2 terms by the renormalization group. This result is in excellent agreement with the present world average.

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Q2-evolution of parton densities at small x values and H1 and ZEUS experimental data

Cited by 5 publications

References 26 publications

Parametrizations of Collinear and kT-Dependent Parton Densities in Proton

Parametrizations of Collinear and kT-Dependent Parton Densities in Proton

Nonperturbative region of effective strong coupling

Average gluon and quark jet multiplicities

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