Extraction of the intrinsic light-quark sea in the proton

Chang, W. C.; Peng, J. C.

doi:10.1103/physrevd.92.054020

Cited by 17 publications

(39 citation statements)

References 36 publications

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“…Therefore, we calculate thed(x) −ū(x) distribution using the Brodsky, Hoyer, Peterson, and Sakai (BHPS) model [72] and show that the available experimental data for this quantity suggest a smaller value for the down quark mass than the up quark one in the BHPS formalism. Note that, this is in contrast to the previous studies in this context [62][63][64] where was assumed equal masses for the down and up quarks in the proton. This difference between masses leads to a sign-change ford(x)−ū(x) when we evolve this quantity to the scale of experimental data [43].…”

Section: Introductionmentioning

confidence: 89%

Improved determination ofd¯(x)−u¯(x)flavor asymmetry in the proton by data from the BONuS experiment at JLAB and using an approach by Brodsky, Hoye

2017

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The experimental data taken from both Drell-Yan and deep-inelastic scattering (DIS) experiments suggest a sign-change ind(x) −ū(x) flavor asymmetry in the proton at large values of momentum fraction x. In this work, we present a phenomenological study ofd(x)−ū(x) flavor asymmetry. First, we extract thed(x) −ū(x) distribution using the more recent data from the BONuS experiment at Jefferson Lab on the ratio of neutron to proton structure functions, F n 2 /F p 2 , and show that it undergoes a sing-change and becomes negative at large values of momentum fraction x, as expected. The stability and reliability of our obtained results have been examined by including target mass corrections (TMCs) as well as higher twist (HT) terms which are particularly important at the large-x region at low Q 2 . Then, we calculate thed(x) −ū(x) distribution using the Brodsky, Hoyer, Peterson, and Sakai (BHPS) model and show that if one chooses a mass for the down quark smaller than the one for the up quark it leads to a better description for the Fermilab E866 data. In order to prove this claim, we determine the masses of down and up sea quarks by fitting to the available and up-to-date experimental data for thed(x) −ū(x) distribution. In this respect, unlike the previous performed theoretical studies, we have shown that this distribution has a sign-change at x > 0.3 after evolution to the scale of available experimental data.

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Section: Introductionmentioning

confidence: 89%

Improved determination ofd¯(x)−u¯(x)flavor asymmetry in the proton by data from the BONuS experiment at JLAB and using an approach by Brodsky, Hoye

2017

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“…GeV has not been shown in Fig 9. In fact, in that scale, the value of α s in the that the choice of initial scale µ 0 is a very important ingredient in this respect, and the evolution of the intrinsic quark distributions from a low initial scale, as suggested by Chang and Pang [35,36,37], is not a good choice at NNLO using VFNS.…”

Section: The Evolution Of the S −S Asymmetrymentioning

confidence: 99%

“…The first ones are produced perturbatively through the splitting of the gluons into qq pairs and are dominant at small x regions, while the later ones are produced through the nonperturbative fluctuations of the nucleon state to five-quark states or meson plus baryon states and are dominant at large x regions. In recent years, the intrinsic quarks have been a subject of study by many investigators [31,34,35,36,37,38,39,40,41,42,43,44,45].…”

Section: Introductionmentioning

confidence: 99%

“…To be more precise, in FFNS, n f is kept fixed throughout the evolution, while in VFNS, the flavor thresholds µ 2 c,b,t related to charm, bottom and top quark masses are introduced and the value of number of active flavors is changed from n f to n f + 1 at these thresholds (note that the number of active flavors is set to n f = 3 below the charm threshold).In other to study the evolution of x(s(x) −s(x)) in the proton, we select the distribution obtained with Λ p = 4 and Λ K = Λ Λ = 2 (see the previous section) and evolve it to Q 2 = 16 GeV 2 as an example. The evolution is preformed from two values of initial scale µ 0 = 0.3 and 0.5 GeV as suggested by Chang and Pang in Refs [35,36,37]. and at both NLO and NNLO.…”

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confidence: 99%

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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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“…There are attempts to extract the strange-quark PDF from the data of M K D (x, Q 2 ) by using Eq. (4), but not without controversy [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Consistency Check of Charged Hadron Multiplicities and Fragmentation Functions in SIDIS

Kao¹,

Yang²,

Chang³

et al. 2017

Proceedings of the 14th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU2016)

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We derived the conditions on certain combinations of integrals of the fragmentation functions of pion using HERMES data for the sum of the charged pion multiplicities from semi-inclusive deepinelastic scattering (SIDIS) off the deuteron target. We have chosen several FFs to study the ratios of the strange PDFs S (x) and the nonstrange PDFs Q(x, Q 2 ) extracted from the charged pion and kaon multiplicities. We conclude that, in the LO QCD analysis and with the D π,K Q,S (Q 2 ) of the FFs chosen in our study, there is inconsistency between S (x, Q 2 )/Q(x, Q 2 ) derived from the pion and kaon multiplicity data.Finally, we demonstrate that the HERMES pion multiplicity data are unlikely to be compatible with two widely-used PDFs, namely CTEQ6L and leading order NNPDF3.0.

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Extraction of the intrinsic light-quark sea in the proton

Cited by 17 publications

References 36 publications

Improved determination ofd¯(x)−u¯(x)flavor asymmetry in the proton by data from the BONuS experiment at JLAB and using an approach by Brodsky, Hoye

Improved determination ofd¯(x)−u¯(x)flavor asymmetry in the proton by data from the BONuS experiment at JLAB and using an approach by Brodsky, Hoye

Study of the s−s¯ asymmetry in the proton

Consistency Check of Charged Hadron Multiplicities and Fragmentation Functions in SIDIS

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