Quark-hadron duality in spin structure functions g1(p) and g1(d)

P. E. Bosted; Angela Biselli

doi:10.1103/PhysRevC.75.035203

Quark-hadron duality in spin structure functions g1(p) and g1(d)

P. E. Bosted, Angela Biselli

Fairfield University

Research output: Contribution to journal › Article › peer-review

Abstract

New measurements of the spin structure functions of the proton and deuteron g ₁ ^p ( x , Q ² ) and g ₁ ^d ( x , Q ² ) in the nucleon resonance region are compared with extrapolations of target-mass-corrected next-to-leading-order (NLO) QCD fits to higher energy data. Averaged over the entire resonance region ( W GeV), the data and QCD fits are in good agreement in both magnitude and Q ² dependence for Q ² >1.7 GeV ² / c ² . This “global” duality appears to result from cancellations among the prominent “local” resonance regions: in particular strong σ _3/2 contributions in the Δ (1232) region appear to be compensated by strong σ _1/2 contributions in the resonance region centered on 1.5 GeV. These results are encouraging for the extension of NLO QCD fits to lower W and Q ² than have been used previously.

Original language	American English
Journal	Physical Review C
Volume	75
DOIs	https://doi.org/10.1103/PhysRevC.75.035203
State	Published - Jan 1 2007

Disciplines

Physical Sciences and Mathematics
Physics

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10.1103/PhysRevC.75.035203License: CC BY

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title = "Quark-hadron duality in spin structure functions g1(p) and g1(d)",

abstract = " New measurements of the spin structure functions of the proton and deuteron g 1 p ( x , Q 2 ) and g 1 d ( x , Q 2 ) in the nucleon resonance region are compared with extrapolations of target-mass-corrected next-to-leading-order (NLO) QCD fits to higher energy data. Averaged over the entire resonance region ( W GeV), the data and QCD fits are in good agreement in both magnitude and Q 2 dependence for Q 2 >1.7 GeV 2 / c 2 . This “global” duality appears to result from cancellations among the prominent “local” resonance regions: in particular strong σ 3/2 contributions in the Δ (1232) region appear to be compensated by strong σ 1/2 contributions in the resonance region centered on 1.5 GeV. These results are encouraging for the extension of NLO QCD fits to lower W and Q 2 than have been used previously.",

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AU - Bosted, P. E.

AU - Biselli, Angela

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N2 - New measurements of the spin structure functions of the proton and deuteron g 1 p ( x , Q 2 ) and g 1 d ( x , Q 2 ) in the nucleon resonance region are compared with extrapolations of target-mass-corrected next-to-leading-order (NLO) QCD fits to higher energy data. Averaged over the entire resonance region ( W GeV), the data and QCD fits are in good agreement in both magnitude and Q 2 dependence for Q 2 >1.7 GeV 2 / c 2 . This “global” duality appears to result from cancellations among the prominent “local” resonance regions: in particular strong σ 3/2 contributions in the Δ (1232) region appear to be compensated by strong σ 1/2 contributions in the resonance region centered on 1.5 GeV. These results are encouraging for the extension of NLO QCD fits to lower W and Q 2 than have been used previously.

AB - New measurements of the spin structure functions of the proton and deuteron g 1 p ( x , Q 2 ) and g 1 d ( x , Q 2 ) in the nucleon resonance region are compared with extrapolations of target-mass-corrected next-to-leading-order (NLO) QCD fits to higher energy data. Averaged over the entire resonance region ( W GeV), the data and QCD fits are in good agreement in both magnitude and Q 2 dependence for Q 2 >1.7 GeV 2 / c 2 . This “global” duality appears to result from cancellations among the prominent “local” resonance regions: in particular strong σ 3/2 contributions in the Δ (1232) region appear to be compensated by strong σ 1/2 contributions in the resonance region centered on 1.5 GeV. These results are encouraging for the extension of NLO QCD fits to lower W and Q 2 than have been used previously.

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Quark-hadron duality in spin structure functions g1(p) and g1(d)

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