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

The NNPDF Collaboration, Richard D. Ball, Luigi Del Debbio, Stefano Forte, Alberto Guffanti, Jose I. Latorre, Andrea Piccione, Juan Rojo, Maria Ubiali

Research output: Contribution to JournalArticleAcademicpeer-review

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\pm 0.019 and |V_cs|=0.96\pm 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\theta_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.
Original languageEnglish
Pages (from-to)195-233
JournalNucl.Phys.B
Volume823
Issue number1-2
DOIs
Publication statusPublished - 10 Jun 2009

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inelastic scattering
neutrinos
protons
partons
sum rules
quantum chromodynamics
methodology
valence
momentum
matrices

Bibliographical note

46 pages, 20 figures; fig.12 and discussion on positivity added, several typos corrected. Final version, to be published in Nucl. Phys. B

Keywords

  • hep-ph

Cite this

Collaboration, T. NNPDF., Ball, R. D., Debbio, L. D., Forte, S., Guffanti, A., Latorre, J. I., ... Ubiali, M. (2009). Precision determination of electroweak parameters and the strange content of the proton from neutrino deep-inelastic scattering. Nucl.Phys.B, 823(1-2), 195-233. https://doi.org/10.1016/j.nuclphysb.2009.08.003
Collaboration, The NNPDF ; Ball, Richard D. ; Debbio, Luigi Del ; Forte, Stefano ; Guffanti, Alberto ; Latorre, Jose I. ; Piccione, Andrea ; Rojo, Juan ; Ubiali, Maria. / Precision determination of electroweak parameters and the strange content of the proton from neutrino deep-inelastic scattering. In: Nucl.Phys.B. 2009 ; Vol. 823, No. 1-2. pp. 195-233.
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Collaboration, TNNPDF, Ball, RD, Debbio, LD, Forte, S, Guffanti, A, Latorre, JI, Piccione, A, Rojo, J & Ubiali, M 2009, 'Precision determination of electroweak parameters and the strange content of the proton from neutrino deep-inelastic scattering' Nucl.Phys.B, vol. 823, no. 1-2, pp. 195-233. https://doi.org/10.1016/j.nuclphysb.2009.08.003

Precision determination of electroweak parameters and the strange content of the proton from neutrino deep-inelastic scattering. / Collaboration, The NNPDF; Ball, Richard D.; Debbio, Luigi Del; Forte, Stefano; Guffanti, Alberto; Latorre, Jose I.; Piccione, Andrea; Rojo, Juan; Ubiali, Maria.

In: Nucl.Phys.B, Vol. 823, No. 1-2, 10.06.2009, p. 195-233.

Research output: Contribution to JournalArticleAcademicpeer-review

TY - JOUR

T1 - Precision determination of electroweak parameters and the strange content of the proton from neutrino deep-inelastic scattering

AU - Collaboration, The NNPDF

AU - Ball, Richard D.

AU - Debbio, Luigi Del

AU - Forte, Stefano

AU - Guffanti, Alberto

AU - Latorre, Jose I.

AU - Piccione, Andrea

AU - Rojo, Juan

AU - Ubiali, Maria

N1 - 46 pages, 20 figures; fig.12 and discussion on positivity added, several typos corrected. Final version, to be published in Nucl. Phys. B

PY - 2009/6/10

Y1 - 2009/6/10

N2 - 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\pm 0.019 and |V_cs|=0.96\pm 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\theta_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.

AB - 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\pm 0.019 and |V_cs|=0.96\pm 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\theta_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.

KW - hep-ph

U2 - https://doi.org/10.1016/j.nuclphysb.2009.08.003

DO - https://doi.org/10.1016/j.nuclphysb.2009.08.003

M3 - Article

VL - 823

SP - 195

EP - 233

JO - Nucl.Phys.B

JF - Nucl.Phys.B

IS - 1-2

ER -