Impact of recent COMPASS data on polarized parton distributions and structure functions

Salimi-Amiri, M.; Khorramian, Ali N.; Abdolmaleki, Hamed; Olness, Fred

doi:10.1103/physrevd.98.056020

Cited by 9 publications

(5 citation statements)

References 116 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that contrary to the other groups the JAM Collaboration has used in his analysis [5] an alternative approach, based on a new iterative Monte Carlo fitting technique. , JAM'15 [5], and SKAO'18 [6]. Note that the results for the polarized PDFs presented in the Table I and Fig.…”

Section: Results Of Analysismentioning

confidence: 91%

See 2 more Smart Citations

Sensitivity of strange quark polarization to flavor SU(3) symmetry breaking

Khorramian,

Leader,

Stamenov

et al. 2020

Preprint

View full text Add to dashboard Cite

The polarized strange quark puzzle concerns the fact that the polarized strange quark density extracted from polarized inclusive deep inelastic scattering data is significantly negative, whereas it is zero or slightly positive when extracted from a combined analysis of polarized semi-inclusive and inclusive deep inelastic data. SU (3) flavor symmetry, which, it is generally accepted, is not an exact symmetry, plays an important role in the inclusive analysis, and all the extracted polarized quark densities depend, to some extent, on the level of symmetry breaking introduced. But by far the most sensitive to the breaking is the strange quark density. In this paper we present a NLO QCD analysis of the world data on polarized inclusive DIS data on protons, neutrons and deuterons, including the final JLAB CLAS/EG1b data on the proton and deuteron, and study the sensitivity of the strange quark polarization to the breaking of flavor SU (3).

show abstract

Section: Results Of Analysismentioning

confidence: 91%

“…The extracted polarized NLO PDFs are plotted in Fig. 1 for Q 2 = 2.5 GeV 2 and compared to those obtained by the groups ([3]- [6]). As seen from Fig.…”

Section: Results Of Analysismentioning

confidence: 98%

See 1 more Smart Citation

Sensitivity of strange quark polarization to flavor SU(3) symmetry breaking

Khorramian,

Leader,

Stamenov

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…We can also compare the QCD nonsinglet results without and with using the orthogonal polynomial methods. Very recently, we have reported a new QCD analysis on polarized PDFs without using the orthogonal polynomial methods [56].…”

Section: Introductionmentioning

confidence: 99%

QCD analysis of structure functions in deep inelastic neutrino-nucleon scattering without using the orthogonal polynomials approach

2019

Self Cite

View full text Add to dashboard Cite

A nonsinglet QCD analysis of neutrino-nucleon structure function is performed based on all the data for charged current neutrino-nucleon deep inelastic scattering (DIS) corresponds to NLO and NNLO approximations, with taking into account the nuclear and higher twist corrections. In this analysis, we extract xu v (x, Q 2 ) and xd v (x, Q 2 ) valence parton distribution functions (PDFs) in a wide range of x and Q 2 , and determine their parametrization with the correlated errors using the xFitter framework. Our results regarding valence-quark densities with their uncertainties are compared to the prediction extracted using other PDF sets from different groups. We determine α s (M 2 Z )= 0.1199 ± 0.0031 and 0.1185 ± 0.0023 with considering the nuclear and higher twist corrections at the NLO and NNLO, respectively, and perform a comparison with other reported results. The extracted results regarding valence-quark distributions and the value of α s (M 2 Z ) are in good agreement with available theoretical models.

show abstract

“…[62,64] we extracted the strong coupling constant using HERA I and II combined data and Neutrino-nucleon structure function data using xFitter. More recently, we also determined the strong coupling constant with polarized data [65]. Note that one of the main purposes of this paper is to determine α s concurrently with the IC probability.…”

mentioning

confidence: 99%

Parton distribution functions and constraints on the intrinsic charm content of the proton using the Brodsky-Hoyer-Peterson-Saka approach

Abdolmaleki

Khorramian

2019

Phys. Rev. D

Self Cite

View full text Add to dashboard Cite

In this work, a new set of parton distribution functions taking into account the intrinsic charm (IC) contribution is presented. We focus on the impact of the EMC measurements on the large x charm structure function as the strongest evidence for the intrinsic charm when combined with the HERA, SLAC and BCDMS data. The main goal of this paper is the simultaneous determination of the intrinsic charm probability P cc/p and strong coupling αs. This allows us to study the interaction of these two quantities as well as the influence on the PDFs in the presence of IC contributions. By considering αs which can be fix or free parameter from our QCD analysis, we find that although there is not a significant change in the extracted central value of PDFs and their uncertainties, the obtained value of P cc/p change by factor 7.8%. The extracted value of P cc/p in the present QCD analysis is consistent with the recent reported upper limit of 1.93%, which is obtained for the first time from LHC measurements. We show the intrinsic charm probability is sensitive to the strong coupling constant and also the charm mass. The extracted value of the strong coupling constant αs(M 2 Z ) = 0.1191 ± 0.0008 at NLO is in good agreement with world average value and available theoretical models.

show abstract

Impact of recent COMPASS data on polarized parton distributions and structure functions

Cited by 9 publications

References 116 publications

Sensitivity of strange quark polarization to flavor SU(3) symmetry breaking

Sensitivity of strange quark polarization to flavor SU(3) symmetry breaking

QCD analysis of structure functions in deep inelastic neutrino-nucleon scattering without using the orthogonal polynomials approach

Parton distribution functions and constraints on the intrinsic charm content of the proton using the Brodsky-Hoyer-Peterson-Saka approach

Contact Info

Product

Resources

About