2015 # Extraction of the intrinsic light-quark sea in the proton

**Abstract:** The HERMES collaboration recently reported a reevaluation of the strange-quark parton distribution, S(x), based on kaon production in semi-inclusive deep-inelastic scattering. Two distinct results on S(x)at the x > 0.1 region, one with a sizable magnitude and another with a vanishing content, were reported.We show that the latter result is due to a particular assumption adopted in the analysis. The impact of the new HERMES S(x) result on the extraction of intrinsic light-quark sea in the proton is discussed. G…

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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].…”

confidence: 89%

“…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].…”

confidence: 89%

“…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.…”

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].…”

confidence: 99%

“…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].…”

confidence: 99%