Measurement of parton distributions of strange quarks in the nucleon from charged-kaon production in deep-inelastic scattering on the deuteron

Airapetian, A.; Акопов, Н.; Akopov, Z.; Andrus, A.; Aschenauer, E. C.; Augustyniak, W.; Avakian, R.; Avetissian, A.; Avetissian, E.; Belostotski, S.; Bianchi, N.; Blok, H. P.; Böttcher, H.; Bonomo, C.; Borissov, A.; Brüll, A.; Bryzgalov, V.; Burns, J.; Capiluppi, M.; Capitani, G. P.; Cisbani, E.; Ciullo, G.; Contalbrigo, M.; Dalpiaz, P.; Deconinck, W.; Лео, Р. Де; Demey, M.; Nardo, L. De; Sanctis, E. De; Diefenthaler, M.; Nezza, P. Di; Dreschler, J.; Düren, M.; Ehrenfried, M.; Elalaoui-Moulay, A.; Elbakian, G.; Ellinghaus, F.; Elschenbroich, U.; Fabbri, R.; Fantoni, A.; Felawka, L.; Frullani, S.; Funel, A.; Gabbert, D.; Gapienko, G.; Гапиенко, В. А.; Garibaldi, F.; Gavrilov, G.; Gharibyan, V.; Giordano, F.; Gliske, S.; Gregor, I. M.; Güler, H.; Hadjidakis, C.; Hasch, D.; Hasegawa, T.; Hesselink, W.H.A.; Hill, G.; Hillenbrand, A.; Hoek, M.; Holler, Y.; Hommez, B.; Hristova, I.; Iarygin, G.; Imazu, Y.; Ivanilov, A.; Izotov, A.; Jackson, H. E.; Jgoun, A.; Joosten, S.; Kaiser, R.; Keri, T.; Kinney, E.; Kisselev, A.; Kobayashi, T.; Kopytin, M.; Коротков, В. А.; Kozlov, V.; Kravchenko, P.; Krivokhijine, V. G.; Lagamba, L.; Lamb, R.; Lapikás, L.; Lehmann, I.; Lenisa, P.; Liebing, P.; Linden-Levy, L. A.; Ruiz, A.; Lorenzon, W.; Lü, Shaozhe; Lu, X. R.; Q., B.; Mahon, D.; Maiheu, B.; Makins, N.; Manfré, L.; Mao, Y.; Mariański, B.; Marukyan, H.; Mexner, V.; Miller, C. A.; Miyachi, Y.; Muccifora, V.; Murray, M.; Mussgiller, A.; Нагайцев, А.; Nappi, E.; Naryshkin, Y.; Nass, A.; Negodaev, M.; Nowak, W.-D.; Osborne, A.M.; Pappalardo, L. L.; Pérez-Benito, R.; Pickert, N.; Raithel, Martin; Reggiani, D.; Reimer, P. E.; Reischl, A.; Reolon, A. R.; Riedl, C.; Rith, Klaus; Rock, S. E.; Rosner, G.; Rostomyan, A.; Rubáček, L.; Rubin, J.; Ryckbosch, D.; Salomatin, Y.; Sanjiev, I.; Schäfer, Andreas; Schnell, G.; Schüler, K. P.; Seitz, B.; Shearer, C.; Shibata, T. A.; Shutov, V.; Stancari, M.; Statera, M.; Steffens, E.; Steijger, J. J. M.; Stenzel, H.; Stewart, J.; Stinzing, F.; Streit, J.; Tait, P.; Taroian, S.; Tchuiko, B.; Terkulov, A.; Trzciński, A.; Tytgat, M.; Vandenbroucke, A.; Nat, P. B. van der; Steenhoven, G. van der; Haarlem, Y. Van; Hulse, C. Van; Varanda, M.; Veretennikov, D.; Vikhrov, V.; Vilardi, I.; Vogel, Christian; Wang, S.; Yaschenko, S.; Ye, H.; Ye, Y.; Ye, Z.; Yen, S.; Yu, W.; Zeiler, D.; Zihlmann, B.; Żuprański, P.

doi:10.1016/j.physletb.2008.07.090

Cited by 136 publications

(166 citation statements)

References 36 publications

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“…Combined analysis of parity violating ep asymmetries and ν p elastic data, used for the extraction of the strange axial form factor, also suggests a negative strange quark contribution [13]. Surprisingly, these results are at variance with the most recent determinations of the strange quark distribution ∆s(x) from SIDIS, which appears to be compatible with zero [14] or even slightly positive [15], at least in the x range of the measurements. Among possible explanations for this observation, a substantial breaking of the SU(3) f symmetry has been advocated [16].…”

Section: Introductionmentioning

confidence: 76%

Quark helicity distributions from longitudinal spin asymmetries in muon–proton and muon–deuteron scattering

Windmolders

2010

Physics Letters B

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135

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Double-spin asymmetries for production of charged pions and kaons in semi-inclusive deep-inelastic muon scattering have been measured by the COMPASS experiment at CERN. The data, obtained by scattering a 160 GeV muon beam off a longitudinally polarised NH 3 target, cover a range of the Bjorken variable x between 0.004 and 0.7. A leading order evaluation of the helicity distributions for the three lightest quarks and antiquark flavours derived from these asymmetries and from our previous deuteron data is presented. The resulting values of the sea quark distributions are small and do not show any sizable dependence on x in the range of the measurements. No significant difference is observed between the strange and antistrange helicity distributions, both compatible with zero. The integrated value of the flavour asymmetry of the helicity distribution of the light-quark sea, ∆u − ∆d, is found to be slightly positive, about 1.5 standard deviations away from zero.

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Section: Introductionmentioning

confidence: 76%

Quark helicity distributions from longitudinal spin asymmetries in muon–proton and muon–deuteron scattering

Windmolders

2010

Physics Letters B

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135

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“…1(a). For the isoscalar deuteron nucleus, the kaon multiplicity is expressed in leading order as follows [14,23]:…”

Section: Extraction Of S(x) From Hermes Kaon Sidis Datamentioning

confidence: 99%

“…Since the probability for the |uudQQ Fock state is expected to be roughly proportional to 1/m 2 Q , where m Q is the mass of quark Q, these light-quark intrinsic seas should be more abundant than the intrinsic charm quark. Using the kaon SIDIS data from HERMES on s(x) +s(x) [14], the E866 Drell-Yan data ond(x) −ū(x) [16], and the CTEQ6.6 PDF [21], it was shown that the probabilities for the |uuduū , |uuddd , and |uudss Fock states have been extracted, supporting the existence of the intrinsic light-quark sea [20].…”

Section: Introductionmentioning

confidence: 98%

“…From neutrino DIS, the momentum fraction carried by s +s, integrated over the measured x range, is found to be roughly half of that carried by the lighterū +d quarks [12,13], reflecting a broken SU(3) symmetry for the proton's sea. In 2008, the HERMES collaboration reported a determination of x(s(x) +s(x)) over the range of 0.02 < x < 0.5 at Q 2 = 2.5 GeV 2 from their measurement of SIDIS for charged-kaon production on a deuteron target with e ± beam [14]. The invariant mass of the photon-nucleon system W is required to be greater than √ 10 GeV.…”

Section: Introductionmentioning

confidence: 99%

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Extraction of the intrinsic light-quark sea in the proton

Chang

Peng

2015

Phys. Rev. D

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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. Given the large uncertainty in the kaon fragmentation function, we find that the latest HERMES data do not exclude the existence of a significant intrinsic strange-quark sea in the proton. The x dependence of the (s +s)/(ū +d) ratio is also in qualitative agreement with the presence of intrinsic strange-quark sea.

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“…Those data provide additional constraints on the s-quark PDF in a much wider kinematical range for Q 2 . The HERMES data on semi-inclusive DIS kaon production [9] can also potentially constrain the strange sea, however the strange sea extracted from those data still suffer from substantial uncertainty due to the modeling of low-Q 2 kaon production [10] therefore they are not included into our analysis.…”

Section: Introductionmentioning

confidence: 99%

Determination of strange sea quark distributions from fixed-target and collider data

et al. 2015

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We present an improved determination of the strange sea distribution in the nucleon with constraints coming from the recent charm production data in neutrino-nucleon deep-inelastic scattering by the NOMAD and CHORUS experiments and from charged current inclusive deep-inelastic scattering at HERA. We demonstrate that the results are consistent with the data from the ATLAS and the CMS experiments on the associated production of W AE -bosons with c-quarks. We also discuss issues related to the recent strange sea determination by the ATLAS experiment using LHC collider data.

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Measurement of parton distributions of strange quarks in the nucleon from charged-kaon production in deep-inelastic scattering on the deuteron

Cited by 136 publications

References 36 publications

Quark helicity distributions from longitudinal spin asymmetries in muon–proton and muon–deuteron scattering

Quark helicity distributions from longitudinal spin asymmetries in muon–proton and muon–deuteron scattering

Extraction of the intrinsic light-quark sea in the proton

Determination of strange sea quark distributions from fixed-target and collider data

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