Nucleon strange<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>s</mml:mi><mml:mover accent="true"><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mo accent="true" stretchy="false">¯</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:math>asymmetry to the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Λ</mml:mi><mml:mo>/</mml:mo><mml:mover accent="true"><mml:mrow><mml:mi mathvariant="normal">Λ</mm

Chi, Yujie; Du, Xi; Ma, Bo-Qiang

doi:10.1103/physrevd.90.074003

Cited by 10 publications

(25 citation statements)

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“…where E h = ν − ε is the measured hadron energy and ε is the loss energy of the quark during the hadronization. The nucleus fragmentation function is expressed as (32) in which D(ε, ν) is the probability for a quark with energy ν to lose an energy ε. Here we adopt the parametrization by Arleo [57],…”

Section: Semi-inclusive Deep Inelastic Scatteringmentioning

confidence: 99%

“…Then the experimental processes and quantities that are sensitive to the sea content in the nucleus should enable us to discriminate different models. It was shown that the Λ/Λ ratio of production cross sections in semi-inclusive DIS (SIDIS) process is a physical quantity that is sensitive to the sea quark content of nucleons [29][30][31][32][33]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

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Nuclear EMC effect through Λ¯/Λ production in semi-inclusive deep-inelastic scattering processes

Gong

2018

Phys. Rev. C

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We calculate Λ andΛ hadron production cross sections in charged lepton semi-inclusive deepinelastic scattering off nuclear target (A, using iron Fe as an example) and deuteron (D) target. The results show that the ratio (Λ A /Λ A )/(Λ D /Λ D ) is sensitive to the sea quark content of the nucleus. We adopt three different models to take the nuclear EMC effect into account. The ratio (Λ A /Λ A )/(Λ D /Λ D ) is predicted to be different by these different models.

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Section: Semi-inclusive Deep Inelastic Scatteringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nuclear EMC effect through Λ¯/Λ production in semi-inclusive deep-inelastic scattering processes

Gong

2018

Phys. Rev. C

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“…22 The content of this report is about our previous studies, and the work has been published in Ref. 24.…”

Section: -20mentioning

confidence: 99%

“…The values of a's and α's can be referred to Ref. 24. The antiquark distributions were considered using SU(3) flavor symmetry relation between octet baryons.…”

Section: The λ/λ Longitudinal Spin Transfers and Asymmetric Nucleon Smentioning

confidence: 99%

Λ/Λ̄ Longitudinal Spin Transfer from Asymmetric Nucleon s/s̄ Distribution

Chi

2016

Int. J. Mod. Phys. Conf. Ser.

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We investigate quark to Λ andΛ longitudinal spin transfers in the light-cone SU(6) quark sepctator-diquark model and try to analyze the possible origins for the spin transfer difference between them measured by the COMPASS collaboration. The intermediate heavier hyperon decay processes are considered, while the final hadron transverse momentum is also included. We find that after taking into account the asymmetric nucleon s/s distribution effect, the results we get are qualitatively comparable with the difference of the COMPASS experimental data.

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“…The HERMES Collaboration has recently reported the determination of x(s(x) +s(x)) over the range of 0.02 < x < 0.5 at Q 2 = 2.5 GeV 2 from the measurement of charged kaon production on a deuteron target [28]. Apart from the kaon production, the Λ/Λ hyperon produced in high energy interactions can also supply information concerning the strange content of the nucleon [29][30][31][32][33]. This is due to the fact that Λ is the lightest baryon containing a strange quark; it has a relatively large production cross section, and its polarization can be also determined by measuring the angular distributions of the decay products.The measurement of the polarization of Λ/Λ hyperons not only allows a unique test of the quark distributions of the target nucleon but also the quark to Λ/Λ fragmentation functions [34][35][36][37][38][39][40][41][42][43][44][45][46][47].…”

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confidence: 99%

Strange quark-antiquark asymmetry of nucleon sea from Λ/Λ¯ polarization

2017

Phys. Rev. D

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Distinctions between quark to Λ andΛ longitudinal spin transfers in the semi-inclusive deep inelastic scattering process were observed by the E665 and COMPASS Collaborations. There are suggestions that the difference between Λ andΛ production is related to the asymmetric strangeantistrange distribution inside the nucleon. However, previous calculations are still too small to explain the experimental data. From a realistic consideration of quark to Λ fragmentation due to different flavors, we investigate the strange quark contribution for Λ production and polarization. We find that the strange quark-antiquark asymmetry of the nucleon sea can be amplified into an observable quantity from the difference between Λ andΛ polarizations after taking into account the larger probability of the Λ produced from the s quark fragmentation process compared to that from the u or d quark. The qualitative agreement between our calculation and the experimental data supports the existence of the intrinsic strange sea and the strange-antistrange asymmetry. Thus the polarization of Λ/Λ does open a new window to probe the nucleon sea properties, especially the strange content and its quark-antiquark asymmetry.The sea content of nucleons is a key focus in hadronic physics as there exist a number of anomalies in experiments, such as the proton spin problem [1] and the NuTeV anomaly [2,3]. Due to the nonperturbative nature of quantum chromodynamics(QCD) at low energy scale, it is complicated to theoretically calculate the sea properties and structures. Also, the limited data sensitive to the sea content of the nucleon from experiments makes the detailed sea structure remain obscure. Even the existence of the intrinsic sea quark and the strange quark-antiquark asymmetry are still under controversy. It is thus important to find experimental quantities that are sensitive to revealing the striking features of the nucleon sea content.From theoretical aspects, the existence of the intrinsic charm quark and the non-negligible uudcc Fock component in the proton was proposed in 1980 to explain the unexpectedly large cross section of charmed hadrons at high x F [4]. This intrinsic quark model has been extended to the light-quark sector with significant progress recently [5]. Under the frame of the intrinsic quark sea, several theoretical models were proposed to investigate the nonperturbative contributions to the nucleon asymmetric strange-antistrange sea distribution, such as the baryon-meson fluctuation model, the meson cloud model, and the chiral quark model [6][7][8][9][10][11]. This asymmetric distribution was thought to play an important role in the extraction of the Weinberg angle [12] from neutrino-nucleon deep inelastic scattering , and it has the potential to remove the NuTeV anomaly [13][14][15][16][17][18][19][20].From experimental aspects, the current constraints on * Electronic address: mabq@pku.edu.cn the strangeness mainly come from the neutrino dimuon production data. This is because a neutrino can resolve the flavor of the nucleon...

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Nucleon strangess¯asymmetry to theΛ/Λ

Cited by 10 publications

References 50 publications

Nuclear EMC effect through Λ¯/Λ production in semi-inclusive deep-inelastic scattering processes

Nuclear EMC effect through Λ¯/Λ production in semi-inclusive deep-inelastic scattering processes

Λ/Λ̄ Longitudinal Spin Transfer from Asymmetric Nucleon s/s̄ Distribution

Strange quark-antiquark asymmetry of nucleon sea from Λ/Λ¯ polarization

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