Reply to Dr Laviano et al.'s Letter

Davidson, Isobel

doi:10.1054/clnu.2001.0546

Cited by 26 publications

(63 citation statements)

References 4 publications

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“…(27) vanishes. Of course, the NuTeV iron target is not exactly isoscalar; however, the corresponding correction can be computed [1] with small uncertainty [2]. The result Eq.…”

Section: Pdf Corrections To the Paschos-wolfenstein Ratiomentioning

confidence: 99%

“…Possible explanations for this include nuclear effects, electroweak corrections, QCD corrections, and physics beyond the standard model [2] (see e.g. [59] for an updated list of references).…”

Section: Pdf Corrections To the Paschos-wolfenstein Ratiomentioning

confidence: 99%

“…[59] for an updated list of references). However, one may also [2] question the validity of the assumption of the vanishing of the contribution in square brackets in Eq. (27).…”

Section: Pdf Corrections To the Paschos-wolfenstein Ratiomentioning

confidence: 99%

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Precision determination of electroweak parameters and the strange content of the proton from neutrino deep-inelastic scattering

et al. 2009

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Abstract:We use recent neutrino dimuon production data combined with a global deep-inelastic parton fit to construct a new parton set, NNPDF1.2, which includes a determination of the strange and antistrange distributions of the nucleon. The result is characterized by a faithful estimation of uncertainties thanks to the use of the NNPDF methodology, and is free of model or theoretical assumptions other than the use of NLO perturbative QCD and exact sum rules. Better control of the uncertainties of the strange and antistrange parton distributions allows us to reassess the determination of electroweak parameters from the NuTeV dimuon data. We perform a direct determination of the |V cd | and |V cs | CKM matrix elements, obtaining central values in agreement with the current global CKM fit: specifically we find |V cd | = 0.244 ± 0.019 and |V cs | = 0.96 ± 0.07. Our result for |V cs | is more precise than any previous direct determination. We also reassess the uncertainty on the NuTeV determination of sin 2 θ W through the Paschos-Wolfenstein relation: we find that the very large uncertainties in the strange valence momentum fraction are sufficient to bring the NuTeV result into complete agreement with the results from precision electroweak data.1

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“…(27) vanishes. Of course, the NuTeV iron target is not exactly isoscalar; however, the corresponding correction can be computed [1] with small uncertainty [2]. The result Eq.…”

Section: Pdf Corrections To the Paschos-wolfenstein Ratiomentioning

confidence: 99%

Section: Pdf Corrections To the Paschos-wolfenstein Ratiomentioning

confidence: 99%

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Precision determination of electroweak parameters and the strange content of the proton from neutrino deep-inelastic scattering

et al. 2009

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“…This reduces the neutral-current cross section. F 3 In a particular case [13], the Z ′ coupling is required to conserve parity (i. e. no axial vector coupling). This is not the only way to obtain a parity-conserving, effective four-fermion interaction for ν µ -hadron neutral-current scattering.…”

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confidence: 99%

“…The value ∼ (G F / √ 2)(0.01) has been deduced [13] phenomenologically as the approximate necessary strength of an effective four-fermion interaction which is, a priori, required to be SU (2) L invariant (we use only a corresponding parityconserving, axial-axial term involving νν and uu(-dd)). In the present model, the effective strength in Eq.…”

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confidence: 99%

Effect of possible stronger neutrino interaction at Eνμ∼1011 GeV upon the extraction of sin2θW from the neutral-current cross section at NuTeV

Barshay¹,

Kreyerhoff²

2002

Physics Letters B

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The possibility exists that cosmic-ray neutrinos with energies of ∼ 10 20 eV interact in the atmosphere with a cross section at the millibarn level, giving rise to some of the highest-energy air showers. In a specific dynamical model which can give rise to such a cross section, we show that there can be a small effect upon the extraction of the effective value of sin 2 θW from νµ-hadron, neutral-current cross section data at NuTeV.The possibility that neutrinos, with energies of the order of 10 20 eV, have stronger interactions with hadrons than those which are given by electroweak theory, has been considered, specifically in connection with the puzzling observation of the highest energy cosmic-ray air shower events.[1, 2] Such energetic neutrinos can propagate from sources at cosmological distances (red shifts > ∼ 1), undisturbed by the cosmic microwave background radiation, which photons largely prevent protons of > ∼ 0.6 × 10 20 eV from arriving here. [3,4] Recently [5] we have explicitly calculated a σ νµ of ∼ 10 −29 cm 2 at E νµ ∼ 10 20 eV, in a specific dynamical model which involves the hypothesis of a strong, parity-conserving interaction of ν µ with a hypothetical, point-like component of a π 0 , leading to a very massive neutral lepton L, with m L ∼ 2 × 10 6 GeV. F 1 The essential physical idea is that of neutrino structure at very small distances (< 10 −18 cm), due to hadron-like coupling to L. For this m L , E νµ must reach ∼ 2 × 10 21 eV for production of real L. However, the amplitude for the diagram in Fig. (1), which involves a virtual L, results in a cross section above the electroweak σ νµ ∼ 10 −31 cm 2 , already at E νµ ∼ 10 20 eV.[5] For a somewhat smaller m L ∼ 0.3 × 10 6 GeV, the production of real L is possible for E νµ above about 0.5 × 10 20 eV, which is close to where the GZK cut-off [3,4] is located[1, 2] for protons coming from cosmological distances. In this case σ νµ can be of the order of millibarns at E νµ ∼ 10 20 eV. Then, a dip at the GZK cut-off, followed by a "bump-structure"[10] near to 10 20 eV could occur in the air-showerThe possibility of an analogous hypothetical structure (with a charged pion) for the muon, can lead to a positive-definite, unusual contribution to (gµ − 2)/2 at the level of 10 −9 , for this value of m L . [5,6] However, in addition to the squared coupling, the magnitude is rather sensitive to possible damping at the structure vertex for virtual momentum near to m L , where the integral gets its main contribution. At present, the significance of a possible experimental deviation [7] from expectation is reduced by the correction of a long-standing sign error in the calculation of a "standard" theoretical contribution. [8,9] In this paper, we consider explicitly, only neutrino, effective neutral-current couplings.

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Precision Electroweak Measurements: a Theorist point of view

Gambino¹

2003

Proceedings of the 31st International Conference on High Energy Physics Ichep 2002

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Reply to Dr Laviano et al.'s Letter

Cited by 26 publications

References 4 publications

Precision determination of electroweak parameters and the strange content of the proton from neutrino deep-inelastic scattering

Precision determination of electroweak parameters and the strange content of the proton from neutrino deep-inelastic scattering

Effect of possible stronger neutrino interaction at Eνμ∼1011 GeV upon the extraction of sin2θW from the neutral-current cross section at NuTeV

Precision Electroweak Measurements: a Theorist point of view

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