$Λ_c^+$ fragmentation functions from pQCD approach and the Suzuki model

Delpasand, Mahdi; Nejad, S. Mohammad Moosavi; Soleymaninia, Maryam

doi:10.48550/arxiv.2006.07602

Cited by 3 publications

(3 citation statements)

References 53 publications

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“…The direct link between the dynamics governing DGLAP-evolving VFNS FFs and the stabilization pattern of the hybrid factorization was initially uncovered via studies of semi-hard emissions of singly heavy-flavored hadrons, including 𝐷 mesons [292][293][294][295][296][297][298][299][300], Λ 𝑐 hyperons [293,301,302], and 𝑏-flavored ( 𝑏 ) hadrons [303][304][305][306][307][308][309][310][311].…”

Section: Rise and Discovery Of The Natural Stabilitymentioning

confidence: 99%

Vector Quarkonia at the LHC with Jethad: A High-Energy Viewpoint

Celiberto

2023

Universe

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In this review, we discuss and extend the study of the inclusive production of vector quarkonia, J/ψ and Υ, emitted with large transverse momenta and rapidities at the LHC. We adopt the novel ZCW19+ determination of fragmentation functions to depict the quarkonium production mechanism at the next-to-leading level of perturbative QCD. This approach is based on the nonrelativistic QCD formalism well adapted to describe the formation of a quarkonium state from the collinear fragmentation of a gluon or a constituent heavy quark at the lowest energy scale. We rely upon the NLL/NLO+ hybrid high-energy and collinear factorization for differential cross-sections, where the collinear formalism is enhanced by the BFKL resummation of next-to-leading energy logarithms arising in the t-channel. We employ the method to analyze the behavior of the rapidity distributions for double-inclusive vector quarkonium and inclusive vector quarkonium plus jet emissions. We discover that the natural stability of the high-energy series, previously seen in observables sensitive to the emission of hadrons with heavy flavor detected in the rapidity acceptance of LHC barrel calorimeters, becomes even more manifest when these particles are tagged in forward regions covered by endcaps. Our findings present the important message that vector quarkonia at the LHC via hybrid factorization offer a unique chance to perform precision studies of high-energy QCD, as well as an intriguing opportunity to shed light on the quarkonium production puzzle.

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Section: Rise and Discovery Of The Natural Stabilitymentioning

confidence: 99%

Vector Quarkonia at the LHC with Jethad: A High-Energy Viewpoint

Celiberto

2023

Universe

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“…In recent years, the EMFFs of charmed hyperon Λ c attracts a lot of interest both theoretically [29][30][31][32] and experimentally [33][34][35][36][37], since the Λ c hyperon is the lightest baryon containing the charm quark. Similar to the Λ hyperon, the Λ c target is unfeasible and the EMFFs of Λ c can not be accessed from exclusive experiments in the space-like region [27,38].…”

Section: Introductionmentioning

confidence: 99%

The electromagnetic form factors of $Λ_c$ hyperon in the vector meson dominance model

Wan,

Yang,

2021

Preprint

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We applied a modified vector meson dominance (VMD) model to analyze the electromagnetic form factors of the Λ c hyperon in the time-like reaction e + e − → Λ + c Λ− c . In the model, we include the contributions from ω(782), ω(1420), ω(1650), φ(1020), φ(1680) and φ(2170), as well as charmed mesons and their resonance states ψ(1S ), ψ(2S ), ψ(3770), ψ(4040), ψ(4160) and ψ(4415). We perform a combined fit to the available data on the Born cross section in reaction e + e − → Λ + c Λ− c and the ratio of the electromagnetic form factors |G E /G M | to obtain the values of the model parameters. Our results show that the vector meson dominance model can simultaneously describe the data of electromagnetic form factors from the Bell and BESIII Collaboration, and the model result for |G E /G M | qualitatively agrees with the data from BESIII. With the fitted parameters, we predict the relative phase ∆Φ between G E and G M . Moreover, we predict the single and double polarization observables in e + e − → Λ + c Λ−c reactions, which are experimentally accessible in the polarized process. We also obtain the form factors of the Λ c hyperon in the space-like region via analytic continuing the time-like form factors.

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“…In perturbative Quantum Chromodynamics (pQCD), unpolarized fragmentation functions (FFs) are necessary ingredients to calculate the cross-section of inclusive single hadron production in hard scattering processes [1][2][3][4][5][6][7][8][9][10][11]. In perturbative QCD, Collinear FFs D h i (z, µ 2 F ) can be expressed as a probability for a parton i at the factorization scale µ F to fragment into a hadron h which carries the fraction z of the parton momentum.…”

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confidence: 99%

First NNLO fragmentation functions of KS0 and Λ/Λ¯ and their uncertainties in

2020

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The current paper presents a determination of K 0 S and Λ/ Λ fragmentation functions (FFs) from QCD analysis of single-inclusive electron-positron annihilation process (SIA). Our FFs determinations are performed at next-to-leading order (NLO), and for the first time, at next-to-next-to-leading order (NNLO) accuracy in perturbative Quantum Chromodynamics (pQCD) which is designated as SAK20 FFs. Each of these FFs is accompanied by their uncertainties which are determined using the 'Hessian' method. Considering the hadron mass corrections, we clearly investigate the reliability of our results upon the inclusion of higher-order QCD correction. We provide comparisons of SAK20 FFs set with the available analysis from another group, finding in general a reasonable agreement, and also considerable differences. In order to judge the fit quality, our theoretical predictions are compared with the analyzed SIA datasets. SAK20 FFs at NLO and NNLO accuracy along with their uncertainties are made available in the standard LHAPDF format in order to use for predictions of present and future measurements in high-energy collisions such as LHC and RHIC.

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$Λ_c^+$ fragmentation functions from pQCD approach and the Suzuki model

Cited by 3 publications

References 53 publications

Vector Quarkonia at the LHC with Jethad: A High-Energy Viewpoint

Vector Quarkonia at the LHC with Jethad: A High-Energy Viewpoint

The electromagnetic form factors of $Λ_c$ hyperon in the vector meson dominance model

First NNLO fragmentation functions of KS0 and Λ/Λ¯ and their uncertainties in

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