Proton fragmentation functions considering finite-mass corrections

Nejad, S. Mohammad Moosavi; Soleymaninia, Maryam; Maktoubian, A.

doi:10.1140/epja/i2016-16316-6

Cited by 35 publications

(19 citation statements)

References 59 publications

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“…In the analysis of Ref. [56], the authors considered the finite-mass effects of the proton to calculate the proton FFs by including SIA data at LO and NLO accuracies. Recently, pion, kaon and proton FFs have been extracted by various groups such as the DEHSS [57,58], HKKS [59], JAM [60], and also by the NNPDF Collaboration [42] using the iterative Monte Carlo method.…”

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confidence: 99%

First QCD analysis of charged hadron fragmentation functions and their uncertainties at next-to-next-to-leading order

2018

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In this paper, we present SGK18 FFs, a first global QCD analysis of parton-to-unidentified charged hadrons fragmentation functions (FFs) at next-to-next-to-leading order (NNLO) accuracy in perturbative QCD. This analysis is based on single-inclusive charged hadron production in electronpositron (e − e + ) annihilation. The uncertainties in the extraction of SGK18 FFs as well as the corresponding observables are estimated using the "Hessian" technique. We study the quality of the SGK18 FFs determined in this analysis by comparing with the recent results in literature. We also show how SGK18 FFs results describe the available data for single-inclusive unidentified charged hadron production in e − e + annihilation. We demonstrate that the theoretical uncertainties due to the variation of the renormalization and factorization scales improve when NNLO QCD corrections are considered. We find that the resulting SGK18 FFs are in good agreement with all data analyzed and the inclusion of NNLO corrections tends to improve the data description with somewhat smaller uncertainty.

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confidence: 99%

First QCD analysis of charged hadron fragmentation functions and their uncertainties at next-to-next-to-leading order

2018

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“…and protons, etc., using the nonperturbative (b, g) → π/K/P FFs extracted in our recent works [47][48][49][50], relying on their universality and scaling violations [51].…”

Section: Jhep03(2017)051mentioning

confidence: 99%

QCD analysis of light charged Higgs production through polarized top quark decay in two different frames

Nejad

Abbaspour

2017

J. High Energ. Phys.

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Light and heavy charged Higgs bosons are predicted by many models with an extended Higgs sector such as the two-Higgs-doublet model (2HDM). Searches for the charged Higgs bosons have been done by the ATLAS and the CMS experiments at the Large Hadron Collider (LHC) in proton-proton collision. However, a definitive search of charged Higgs bosons still has to be carried out by the LHC experiments. The experimental observation of charged Higgs bosons would indicate physics beyond the Standard Model. In the present work we study the O(α s ) correction to the energy spectrum of the inclusive bottom-flavored mesons (X b ) in polarized top quark decays into a light charged Higgs boson (m H + < m t ) and a massless bottom quark followed by the hadronization process b → X b in the type-I 2HDM, i.e. t(↑) → H + b → H + X b + Jet. This spin-dependent energy distribution is studied in two different helicity coordinate systems. This study could be considered as a new channel to indirect search for the charged Higgs bosons. To present our phenomenological predictions, we restrict ourselves to the constraints on the m H + − tan β parameter space determined by the recent results of the CMS and the ATLAS collaborations.

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“…It is well known now that the factorisation theorem of Quantum Chromodynamics (QCD) [1,2] can provide a powerful tool for calculating cross sections of high energy processes, by dividing them to perturbative and nonperturbative parts. In this respect, the nonperturbative objects such as the parton distribution functions (PDFs) [3,4,5,6,7,8,9,10,11,12,13], polarized PDFs [14,15,16,17,18,19,20], nuclear PDFs [21,22,23,24,25], and fragmentation functions (FFs) [26,27,28,29] play an essential role for testing QCD, describing the experimental data, and searching New Physics. Among them, the PDFs have always been of particular importance.…”

Section: Introductionmentioning

confidence: 99%

Study of the s−s¯ asymmetry in the proton

Goharipour

2018

Nuclear Physics A

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The study of s −s asymmetry is essential to better understand of the structure of nucleon and also the perturbative and nonperturbative mechanisms for sea quark generation. Actually, the nature and dynamical origins of this asymmetry have always been an interesting subject to research both experimentally and theoretically. One of the most powerful models can lead to s−s asymmetry is the meson-baryon model (MBM). In this work, using a simplified configuration of this model suggested by Pumplin, we calculate the s −s asymmetry for different values of cutoff parameter Λ, to study the dependence of model to this parameter and also to estimate the theoretical uncertainty imposed on the results due to its uncertainty. Then, we study the evolution of distributions obtained both at next-to-leading order (NLO) and next-to-next-to-leading order (NNLO) using different evolution schemes. It is shown that the evolution of the intrinsic quark distributions from a low initial scale, as suggested by Chang and Pang, is not a good choice at NNLO using variable flavor number scheme (VFNS).

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Proton fragmentation functions considering finite-mass corrections

Cited by 35 publications

References 59 publications

First QCD analysis of charged hadron fragmentation functions and their uncertainties at next-to-next-to-leading order

First QCD analysis of charged hadron fragmentation functions and their uncertainties at next-to-next-to-leading order

QCD analysis of light charged Higgs production through polarized top quark decay in two different frames

Study of the s−s¯ asymmetry in the proton

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