Determination of PDFs and the strong coupling based on four different schemes

Shokouhi, A.B.; Vafaee, A.

doi:10.1016/j.nuclphysbps.2018.12.008

Cited by 3 publications

(2 citation statements)

References 42 publications

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“…• Extra Minimisation Parameters: In fitting with fixed strong coupling, we set the strong coupling to α s (M 2 Z ) = 0.1176 and in fitting with free strong coupling, we varied α s (M 2 Z ) in steps of 0.001. In addition, we fixed the strangeness suppression factor to f s = 0.31, which has the best consistency with other physical parameters of this NLO QCD analysis [46][47][48][49]. 2.0.0 FrozenFrog and start this NLO QCD analysis evolution at starting scale of Q 2 0 = 1.9 GeV 2 [50][51][52][53][54].…”

Section: Fitting and Qcd Set-upmentioning

confidence: 99%

The pQCD analysis to extract PDFs and $α_s^{\rm NLO}(M^2_Z)$ from inclusive jet-hadron production data

Vafaee,

Shokouhi

2019

Preprint

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This perturbative Quantum Chromo Dynamics (pQCD) analysis attempts to present a simultaneous determination of parton distribution functions (PDFs) and the strong coupling α s (M 2 Z ) from inclusion of inclusive H1 and ZEUS jet, DiJets and TriJets production cross sections data on the HERA I and II combined data, as the central data sets for probing the internal structure of proton. To present an accurate pQCD analysis, we separate the role and influence of inclusion jet production cross sections data from inclusion of the strong coupling α s (M 2 Z ) as an extra fit parameter parameter on the gluon distribution. We show inclusion of jet, DiJets and TriJets production cross sections data improves the consistency between experiment and theory of cross sections for neutral current (NC) and charged current (CC) interactions of deep inelastic e ± p scattering on proton up to ∼ 2.8 %. In addition, we show inclusion of jet production cross section data and considering α s (M 2 Z ) as a pQCD free parameter not only reduce dramatically the uncertainty band of gluon distribution but also improve the consistency between experiment and theory of NC and CC deep inelastic e ± p scattering cross sections up to ∼ 3.6 %. Our simultaneous determination of PDFs and the strong coupling α s (M 2 Z ) with inclusion of jet production cross sections data leads to α NLO s (M 2 Z ) = 0.12041 ± 0.00086, which is in a good agreement with world average and other individual measurements.

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Section: Fitting and Qcd Set-upmentioning

confidence: 99%

The pQCD analysis to extract PDFs and $α_s^{\rm NLO}(M^2_Z)$ from inclusive jet-hadron production data

Vafaee,

Shokouhi

2019

Preprint

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“…• To fitting with experimental data, we us the xFitter package as a powerful QCD open source framework [81][82][83][84][85][86][87][88][89].…”

Section: Qcd Analysis Set-up and Systematic Uncertaintiesmentioning

confidence: 99%

NNLO compatibility between pQCD theory and phenomenology in determination of the $b$-quark pole and \MSbar running masses

Vafaee,

Javidan,

Shokouhi

2019

Preprint

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Measurements of open b-quark production in deep inelastic scattering (DIS) of e ± p at HERA provide an important test of pQCD theory within the Standard Model and is used to constrain the proton PDFs. In this contribution, we attempt to determine the b-quark pole mass M b and MS running mass m b , using phenomenology of H1, ZEUS and (H1 + ZEUS) F bb 2 beauty vertex production data sets and pQCD theory. Then we discuss about the compatibility between pQCD

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NNLO compatibility between pQCD theory and phenomenology in determination of the b-quark pole and MS¯ running masses

Vafaee¹,

Javidan

Shokouhi³

2020

Mod. Phys. Lett. A

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This contribution attempts to determine the [Formula: see text]-quark pole mass [Formula: see text] and [Formula: see text] running mass [Formula: see text] with two different approaches at the next-to-next-to-leading order (NNLO) corrections. At the first approach, we derive a relation between the [Formula: see text]-quark pole mass [Formula: see text] and its [Formula: see text] running mass [Formula: see text] at the NNLO corrections based on the perturbative Quantum Chromo Dynamics (pQCD) predictions. At the second approach, we extract numerical values of the [Formula: see text]-quark pole and [Formula: see text] running masses based on the NNLO phenomenology of H1 and ZEUS Collaborations combined beauty vertex production experimental data. Then we discuss about the compatibility between the pQCD theory results and phenomenology approach in determination of the [Formula: see text]-quark pole and [Formula: see text] running masses at the NNLO corrections. Also, we investigate the role and influence of the [Formula: see text]-quark mass as an extra degree of freedom added to the input parameters of the Standard Model Lagrangian, on the improvement of the uncertainty band of the proton parton distribution functions (PDFs) and particularly on the gluon distribution.

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Determination of PDFs and the strong coupling based on four different schemes

Cited by 3 publications

References 42 publications

The pQCD analysis to extract PDFs and $α_s^{\rm NLO}(M^2_Z)$ from inclusive jet-hadron production data

The pQCD analysis to extract PDFs and $α_s^{\rm NLO}(M^2_Z)$ from inclusive jet-hadron production data

NNLO compatibility between pQCD theory and phenomenology in determination of the $b$-quark pole and \MSbar running masses

NNLO compatibility between pQCD theory and phenomenology in determination of the b-quark pole and MS¯ running masses

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