Background substraction in parity violation experiments

Wiele, J. Van de; Morlet, M.

doi:10.1140/epjad/s2005-04-033-y

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…This program of measurements was sparked by the seminal papers of Kaplan and Manohar [1], McKeown [2], and Beck [3]. The SAMPLE experiment at the MIT-Bates Lab and the HAPPEX experiment at Jefferson Lab have already made measurements of these asymmetries, and a tremendous amount of additional data will be collected on these asymmetries at Mainz [4] and Jefferson Lab [5,6,7,8] in the next 3-4 years.…”

mentioning

confidence: 99%

Determination of the Strange Form Factors of the Nucleon fromνp,ν¯p, and Parity-Violatinge→
Pate
¹

2004
Phys. Rev. Lett.
62
2
67
0
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Determination of the strange form factors of the nucleon from νp,νp, and parity-violating ep elastic scattering A new method of obtaining the strange form factors of the nucleon is presented, in which forwardangle parity-violating ep elastic scattering data is combined with νp andνp elastic scattering data. The axial form factor in electron-nucleon scattering is complicated by the presence of electro-weak radiative corrections that in principle need to be calculated or separately measured, but this axial form factor is suppressed at forward angles. The neutrino data has no such complication. Hence the use of forward-angle parity-violating ep data with νp andνp data allows the extraction of all three strange form factors: electric, magnetic and axial (G s E , G s M , and G s A ). In this letter, νp and νp data from the Brookhaven E734 experiment are combined with the Jefferson Lab HAPPEX ep data to obtain two distinct solutions for the strange form factors at Q 2 = 0.5 GeV 2 . More generally, combining the neutrino elastic scattering data from E734 with the existing and upcoming ep data will yield the strange form factors of the nucleon for Q 2 of 0.45-1.05 GeV 2 . Measurement of G s A is crucial to the determination of the strange quark contribution to the nucleon spin, ∆s.

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mentioning

confidence: 99%

Determination of the Strange Form Factors of the Nucleon fromνp,ν¯p, and Parity-Violatinge→
Pate
¹

2004
Phys. Rev. Lett.
62
2
67
0
View full text Add to dashboard Cite

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“…The cross sections have been interpolated for intermediate values using a spline method. In order to obtain rates, each event (number j) is normalized through a weight w j proportional to the cross section [35]:…”

Section: Application To the G 0 Experiments At Forward Anglesmentioning

confidence: 99%

Electromagnetic radiative corrections in parity-violating electron-proton scattering

et al. 2005

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QED radiative corrections have been calculated for leptonic and hadronic variables in parityviolating elastic ep scattering. For the first time, the calculation of the asymmetry in the elastic radiative tail is performed without the peaking-approximation assumption in hadronic variables configuration. A comparison with the PV-A4 data validates our approach. This method has been also used to evaluate the radiative corrections to the parity-violating asymmetry measured in the G0 experiment. The results obtained are here presented.PACS. 25.30.Bf Elastic electron scattering -13.60.-r Photon and charged-lepton interactions with hadrons

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“…The energy resolution of the detectors must be sufficient to separate the 10 MHz of elastically scattered electrons from the 90 MHz of inelastic electrons coming from threshold pion and resonance production. The achieved energy resolution was 4%/ √ E [ 25]. The first PVA4 measurement was at a beam energy of 855 MeV, corresponding to Q 2 =0.23 (GeV/c) 2 and a sensitivity to the combination G to combine with the existing HAPPEX and PVA4 data.…”

Section: Pva4 At Mainzmentioning

confidence: 99%

Parity violation with electrons and hadrons

BEISE¹

2004

Nuclear Physics A

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A key question in understanding the structure of nucleons involves the role of sea quarks in their ground state electromagnetic properties such as charge and magnetism. Parity-violating electron scattering, when combined with determination of nucleon electromagnetic form factors from parity-conserving e-N scattering, provides another degree of freedom to separately determine the up, down and strange quark contributions to nucleon electromagnetic structure. Strange quarks are unique in that they are exclusively in the nucleon's sea. A program of experiments using parity violating electron scattering has been underway for approximately a decade, and results are beginning to emerge. This paper is a brief overview of the various experiments and their results to date along with a short-term outlook of what can be anticipated from experiments in the next few years.

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Background substraction in parity violation experiments

Abstract: The importance of the knowledge of the background in parity violating (PV) experiments is shown. Some improvements in Monte Carlo simulations are presented and discussed.

Cited by 3 publications

References 4 publications

Determination of the Strange Form Factors of the Nucleon fromνp,ν¯p, and Parity-Violatinge→
Pate
¹

2004
Phys. Rev. Lett.
62
2
67
0
View full text Add to dashboard Cite

Determination of the Strange Form Factors of the Nucleon fromνp,ν¯p, and Parity-Violatinge→
Pate
¹

2004
Phys. Rev. Lett.
62
2
67
0
View full text Add to dashboard Cite

Electromagnetic radiative corrections in parity-violating electron-proton scattering

Parity violation with electrons and hadrons

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Background substraction in parity violation experiments

Abstract: The importance of the knowledge of the background in parity violating (PV) experiments is shown. Some improvements in Monte Carlo simulations are presented and discussed.

Cited by 3 publications

References 4 publications

Determination of the Strange Form Factors of the Nucleon fromνp,ν¯p, and Parity-Violatinge→Pate1 2004Phys. Rev. Lett.622670View full textAdd to dashboardCite

Determination of the Strange Form Factors of the Nucleon fromνp,ν¯p, and Parity-Violatinge→Pate1 2004Phys. Rev. Lett.622670View full textAdd to dashboardCite

Electromagnetic radiative corrections in parity-violating electron-proton scattering

Parity violation with electrons and hadrons

Contact Info

Product

Resources

About

Determination of the Strange Form Factors of the Nucleon fromνp,ν¯p, and Parity-Violatinge→
Pate
¹

2004
Phys. Rev. Lett.
62
2
67
0
View full text Add to dashboard Cite

Determination of the Strange Form Factors of the Nucleon fromνp,ν¯p, and Parity-Violatinge→
Pate
¹

2004
Phys. Rev. Lett.
62
2
67
0
View full text Add to dashboard Cite