On the momentum dependence of the flavor structure of the nucleon sea

Jen Chieh Peng; Wen Chen Chang; Hai Yang Cheng; Tie Jiun Hou; Keh Fei Liu; Jian Wei Qiu

doi:10.1016/j.physletb.2014.07.050

On the momentum dependence of the flavor structure of the nucleon sea

Jen Chieh Peng, Wen Chen Chang, Hai Yang Cheng, Tie Jiun Hou, Keh Fei Liu, Jian Wei Qiu

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

15 Scopus citations

Abstract

Difference between the u- and d- sea quark distributions in the proton was first observed in the violation of the Gottfried sum rule in deep-inelastic scattering (DIS) experiments. The parton momentum fraction x dependence of this difference has been measured over the region 0.02. <. x<. 0.35 from Drell-Yan and semi-inclusive DIS experiments. The Drell-Yan data suggested a possible sign-change for d-(x)-u-(x) near x~. 0.3, which has not yet been explained by existing theoretical models. We present an independent evidence for the d-(x)-u-(x) sign-change at x~. 0.3 from an analysis of the DIS data. We further discuss the x-dependence of d--u- in the context of meson cloud model and the lattice QCD formulation.

Original language	English
Pages (from-to)	411-414
Number of pages	4
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	736
DOIs	https://doi.org/10.1016/j.physletb.2014.07.050
State	Published - Sep 7 2014

Bibliographical note

Funding Information:
We acknowledge helpful discussion with Jiunn-Wei Chen and Chien-Peng Yuan. This work was supported in part by the National Science Council of the Republic of China and the U.S. Department of Energy under contact Nos. DE-AC02-98CH10886 and DE-FG05-84ER40154 , and the National Science Foundation under grant Nos. PHY-0969739 and PHY-1316617 .

Keywords

D-(x)-u-(x)
Lattice QCD
Parton distributions
Sea quark

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/j.physletb.2014.07.050

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title = "On the momentum dependence of the flavor structure of the nucleon sea",

abstract = "Difference between the u- and d- sea quark distributions in the proton was first observed in the violation of the Gottfried sum rule in deep-inelastic scattering (DIS) experiments. The parton momentum fraction x dependence of this difference has been measured over the region 0.02. <. x<. 0.35 from Drell-Yan and semi-inclusive DIS experiments. The Drell-Yan data suggested a possible sign-change for d-(x)-u-(x) near x~. 0.3, which has not yet been explained by existing theoretical models. We present an independent evidence for the d-(x)-u-(x) sign-change at x~. 0.3 from an analysis of the DIS data. We further discuss the x-dependence of d--u- in the context of meson cloud model and the lattice QCD formulation.",

keywords = "D-(x)-u-(x), Lattice QCD, Parton distributions, Sea quark",

author = "Peng, {Jen Chieh} and Chang, {Wen Chen} and Cheng, {Hai Yang} and Hou, {Tie Jiun} and Liu, {Keh Fei} and Qiu, {Jian Wei}",

note = "Funding Information: We acknowledge helpful discussion with Jiunn-Wei Chen and Chien-Peng Yuan. This work was supported in part by the National Science Council of the Republic of China and the U.S. Department of Energy under contact Nos. DE-AC02-98CH10886 and DE-FG05-84ER40154 , and the National Science Foundation under grant Nos. PHY-0969739 and PHY-1316617 .",

year = "2014",

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doi = "10.1016/j.physletb.2014.07.050",

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T1 - On the momentum dependence of the flavor structure of the nucleon sea

AU - Peng, Jen Chieh

AU - Chang, Wen Chen

AU - Cheng, Hai Yang

AU - Hou, Tie Jiun

AU - Liu, Keh Fei

AU - Qiu, Jian Wei

N1 - Funding Information: We acknowledge helpful discussion with Jiunn-Wei Chen and Chien-Peng Yuan. This work was supported in part by the National Science Council of the Republic of China and the U.S. Department of Energy under contact Nos. DE-AC02-98CH10886 and DE-FG05-84ER40154 , and the National Science Foundation under grant Nos. PHY-0969739 and PHY-1316617 .

PY - 2014/9/7

Y1 - 2014/9/7

N2 - Difference between the u- and d- sea quark distributions in the proton was first observed in the violation of the Gottfried sum rule in deep-inelastic scattering (DIS) experiments. The parton momentum fraction x dependence of this difference has been measured over the region 0.02. <. x<. 0.35 from Drell-Yan and semi-inclusive DIS experiments. The Drell-Yan data suggested a possible sign-change for d-(x)-u-(x) near x~. 0.3, which has not yet been explained by existing theoretical models. We present an independent evidence for the d-(x)-u-(x) sign-change at x~. 0.3 from an analysis of the DIS data. We further discuss the x-dependence of d--u- in the context of meson cloud model and the lattice QCD formulation.

AB - Difference between the u- and d- sea quark distributions in the proton was first observed in the violation of the Gottfried sum rule in deep-inelastic scattering (DIS) experiments. The parton momentum fraction x dependence of this difference has been measured over the region 0.02. <. x<. 0.35 from Drell-Yan and semi-inclusive DIS experiments. The Drell-Yan data suggested a possible sign-change for d-(x)-u-(x) near x~. 0.3, which has not yet been explained by existing theoretical models. We present an independent evidence for the d-(x)-u-(x) sign-change at x~. 0.3 from an analysis of the DIS data. We further discuss the x-dependence of d--u- in the context of meson cloud model and the lattice QCD formulation.

KW - D-(x)-u-(x)

KW - Lattice QCD

KW - Parton distributions

KW - Sea quark

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JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

On the momentum dependence of the flavor structure of the nucleon sea

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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