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

Alekhin, S.; Blümlein, J.; Caminada, L.; Lipka, K.; Lohwasser, K.; Moch, S.; Petti, R.; Pla, R.

doi:10.1103/physrevd.91.094002

Cited by 62 publications

(67 citation statements)

References 105 publications

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“…More immediately, perhaps, further constraints may be possible through measurement of associated charm and weak boson production in pp scattering at the LHC [85]. The theoretical framework utilized here can also be extended to systematically explore the effects of kaon loops within the chiral theory on strange quark polarization, including contributions from both octet and decuplet hyperons, which will be discussed in a separate publication [65].…”

Section: Discussionmentioning

confidence: 99%

Strange-quark asymmetry in the proton in chiral effective theory

Wang

Melnitchouk

et al. 2016

Phys. Rev. D

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We perform a comprehensive analysis of the strange-antistrange parton distribution function (PDF) asymmetry in the proton in the framework of chiral effective theory, including the full set of lowest order kaon loop diagrams with off-shell and contact interactions, in addition to the usual on-shell contributions previously discussed in the literature. We identify the presence of δ-function contributions to thes PDF at x = 0, with a corresponding valence-like component of the s-quark PDF at larger x, which allows greater flexibility for the shape of s −s. Expanding the moments of the PDFs in terms of the pseudoscalar kaon mass, we compute the leading nonanalytic behavior of the number and momentum integrals of the s ands distributions, consistent with the chiral symmetry of QCD. We discuss the implications of our results for the understanding of the NuTeV anomaly and for the phenomenology of strange quark PDFs in global QCD analysis.

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Section: Discussionmentioning

confidence: 99%

Strange-quark asymmetry in the proton in chiral effective theory

Wang

Melnitchouk

et al. 2016

Phys. Rev. D

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“…This covers a wide kinematic range, because a hard scale provided by the mass of heavy quarks allows applicability of pQCD even at low transverse momentum p T ∼ Λ QCD ; -W ± + c final states probe the strange-quark content of the proton, since the LO production mechanism is gs → W ± c [83].…”

Section: Heavy-quark Production In Pp Collisionsmentioning

confidence: 99%

Charm production and QCD analysis at HERA and LHC

Zenaiev

2017

Eur. Phys. J. C

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This review is devoted to the study of charm production in ep and pp collisions. The total set of measurements obtained by the two collaborations H1 and ZEUS from HERA and their combination is outlined, as well as complementary data obtained by the LHCb Collaboration at the LHC. After fitting the parton distribution functions the charm-production cross sections are predicted within perturbative QCD at next-to-leading order using the fixed-flavournumber scheme. Agreement with the data is found. The combined HERA charm data are sensitive to the c-quark mass and enabled its accurate determination. The predictions crucially depend upon the knowledge of the gluon distribution function. It is shown that the shape of the gluon distribution based on the HERA data is considerably improved by adding the measurements from LHCb and applicable down to values x of about 10 −6 , where x is the proton momentum fraction carried by a parton.

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“…This is in fact what seems to be happening when comparing the strange quark extracted from LHC data on W +c productions, where one observes a ratio k = 2s/(ū+d) ≈ 1 compared to k ≈ 0.4 obtained in fits utilizing only di-muon data; see [40] for a more detailed discussion and for an alternative interpretation of this mismatch. Indications of issues with strange quarks also come from semi-inclusive DIS kaon cross sections from the HERMES collaboration [41], that…”

Section: Pos(dis2015)001mentioning

confidence: 91%

PDFs from protons to nuclei

Accardi¹

2016

Proceedings of XXIII International Workshop on Deep-Inelastic Scattering — PoS(DIS2015)

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I review recent progress in the extraction of unpolarized parton distributions in the proton and in nuclei from a unified point of view that highlights how the interplay between high-energy particle physics and lower energy nuclear physics can be of mutual benefit to either field in areas ranging from the search for physics beyond the standard model at the LHC, to the study of the non perturbative structure of nucleons and teh emergence of nuclei from quark and gluon degrees of freedom, to the interaction of colored probes in a cold nuclear medium.

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

Cited by 62 publications

References 105 publications

Strange-quark asymmetry in the proton in chiral effective theory

Strange-quark asymmetry in the proton in chiral effective theory

Charm production and QCD analysis at HERA and LHC

PDFs from protons to nuclei

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