Nuclear effects on the extraction of sin2θ

Kovalenko, S.; Schmidt, Iván; Yang, Jian

doi:10.1016/s0370-2693(02)02591-1

Cited by 31 publications

(17 citation statements)

References 24 publications

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“…From Eqs. (7) and (8), we can have the quark distribution functions of the nucleon by using the splitting function Eq. (10) and the constituent quark distributions u 0 and d 0 which are normalized to 1,…”

Section: The Sea Content In the Effective Chiral Quark Modelmentioning

confidence: 99%

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Nucleon sea in the effective chiral quark model

Ding

2005

Phys. Rev. D

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The asymmetries of both light-flavor antiquark $\bar{d}(x)-\bar{u}(x)$ and strange-antistrange $s(x)-\bar{s}(x)$ distributions of the nucleon sea are considered with more details in the effective chiral quark model. We find that the asymmetric distribution of light-flavor antiquarks $\bar{d}(x)-\bar{u}(x)$ matches the experiment data well and that the asymmetry of strange and antistrange distributions can bring about 60-100% correction to the NuTeV anomaly of $\sin^{2}\theta_{w}$, which are three standard deviations from the world average value measured in other electroweak processes. The results on the correction to the NuTeV anomaly are insensitive to the inputs of the constituent quark distributions and the cut-off parameters. The ratios of $\bar{d}(x)/\bar{u}(x)$ and $s(x)/\bar{s}(x)$ are also discussed, and it is found that the ratio $s(x)/\bar{s}(x)$ is compatible with the available experiments with an additional symmetric sea contribution being considered effectively.Comment: 24 Latex pages, 8 figure

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Section: The Sea Content In the Effective Chiral Quark Modelmentioning

confidence: 99%

“…In addition, nuclear effects were completely estimated and the shift to the NuTeV anomaly was given with some uncertainties in Ref. [7] by using a particular nuclear x-rescaling model to describe the structure functions in (anti-)neutrino-nucleus DIS. Also, there are other suggestions [8] from a conservative point of views.…”

Section: Introductionmentioning

confidence: 99%

Nucleon sea in the effective chiral quark model

Ding

2005

Phys. Rev. D

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“…Model effects [6,7,8,9,10,11,12,13,14,15,16]. In this paper we shall investigate whether the anomalous NuTeV result for sin 2 θ W could be due to the different behavior of leading-twist nuclear shadowing and antishadowing effects for charged and neutral currents.…”

Section: Introductionmentioning

confidence: 99%

Nuclear antishadowing in neutrino deep inelastic scattering

2004

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The shadowing and antishadowing of nuclear structure functions in the GribovGlauber picture is due respectively to the destructive and constructive interference of amplitudes arising from the multiple-scattering of quarks in the nucleus. The effective quark-nucleon scattering amplitude includes Pomeron and Odderon contributions from multi-gluon exchange as well as Reggeon quark-exchange contributions.We show that the coherence of these multiscattering nuclear processes leads to shadowing and antishadowing of the electromagnetic nuclear structure functions in agreement with measurements. This picture leads to substantially different antishadowing for charged and neutral current reactions, thus affecting the extraction of the weakmixing angle θ W . We find that part of the anomalous NuTeV result for θ W could be due to the nonuniversality of nuclear antishadowing for charged and neutral currents.Detailed measurements of the nuclear dependence of individual quark structure functions are thus needed to establish the distinctive phenomenology of shadowing and antishadowing and to make the NuTeV results definitive.2

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“…(1), there are a number of corrections that need to be considered, such as charge symmetry violation [4], which should reduce roughly one-third of the discrepancy between the NuTeV result and all accepted average value of sin 2 θ w , nuclear effect, which arises from the higher twist effect of nuclear shadowing [5], neutron excess [6], although such modification are not measured, differences in shadowing from photons, W ± and Z 0 s [7], asymmetry in the s and s distributions [8], nuclear correction, discussed in Ref. [9] by noting nuclear modification of F 2 , also recently QCD correction [10], and so on. In addition, the discussion of possible uncertainties and physics behind the anomaly can be found in Ref.…”

Section: Introductionmentioning

confidence: 99%

Contribution of asymmetric strange–antistrange sea to the Paschos–Wolfenstein relation

Ding

2004

Physics Letters B

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The NuTeV Collaboration reported a value of sin 2 θ w measured in neutrino-nucleon deep inelastic scattering, and found that the value is three standard deviations from the standard model prediction. This result is obtained under the assumption that the strange-antistrange sea quarks of nucleons are symmetric, and that the up and down quark distributions are symmetric with the simultaneous interchange of u↔d and p↔n. We discuss the contribution of asymmetric strange-antistrange sea to the Paschos-Wolfenstein relation in the extraction of weak mixing angle sin 2 θ w . We also point out that the contribution of asymmetric strange-antistrange sea should remove roughly 30-80% of the discrepancy between the NuTeV result and other determinations of sin 2 θ w , when using the light-cone meson-baryon model to calculate the contribution of the strange-antistrange sea.

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Nuclear effects on the extraction of sin2θ

Cited by 31 publications

References 24 publications

Nucleon sea in the effective chiral quark model

Nucleon sea in the effective chiral quark model

Nuclear antishadowing in neutrino deep inelastic scattering

Contribution of asymmetric strange–antistrange sea to the Paschos–Wolfenstein relation

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