Erratum: “Effect of asymmetric strange seas and isospin-violating parton distribution functions onsin2θWmeasured in the NuTeV experiment” [Phys. Rev. D65, 111103

Abstract

The following changes should be noted.A new measurement of the neutron excess is reported from an updated material assay of the NuTeV target, ␦Nϭ5.74 Ϯ0.02%. This new value, while consistent with the previously reported neutron excess, is more precise.The definition of the neutron excess is clarified. The expression on page 111103-2 should read ␦Nϵ(AϪ2Z)/A.A sign mistake in the second term in Eq. ͑7͒ is corrected. In addition, this second term should instead have been expressed as the fractional difference in the total valence momentum carried by the U and D quarks:

Radiatively Generated Isospin Violations in the Nucleon and the NuTeV Anomaly

“…Similar overestimates are obtained for the nonperturbative (hadronic) bag model results [5]. Furthermore, the frequently used [6,7,24,26] expression for δR − s in (8) due to a strangeness asymmetry represents already a priori an overestimate since it results from treating naively the CC transition (−) s → (−) c without a kine-matic suppression factor for massive charm production [3]. Nevertheless one obtains ∆s 2 W | strange = δR − s = −0.0021 using [25] S − = 0.00165, instead of ∆s 2 W | strange = −0.0017 in (6), as derived from (4).…”

“…Possible sources for this discrepancy (see, for example, [3,4,5,6,7]) include, among other things, isospin-symmetry violating contributions of the parton distributions in the nucleon, i.e., nonvanishing δq v and δq defined via…”

“…(Note that the correct expressions for both δR − I and δR − s have been presented only in [3]). Our radiative QED results in Fig.…”

Dynamical parton distributions of the nucleon

“…effects due to a non-isoscalar target, higher-twists, charm production, etc. ; several sources, spanning from new physics to nuclear effects, have been proposed to explain this discrepancy (see, for instance, [182][183][184][185]). Among them isospin-symmetry violating contributions of the parton distributions in the nucleon and effects caused by the strange sea asymmetry s =s turn out to be relevant.…”

“…1.5 within the frame- Figure 2.36: The functionals describing the shift in the NuTeV s 2 W measurement caused by isospin and strange sea asymmetries in the nucleon as presented in [182].…”