Proton spin content from lattice QCD

Nilmani Mathur; S. J. Dong; K. F. Liu; N. C. Mukhopadhyay

doi:10.1016/s0920-5632(00)91637-2

Proton spin content from lattice QCD

Nilmani Mathur
, S. J. Dong
, K. F. Liu
, N. C. Mukhopadhyay

Physics And Astronomy

Producción científica: Article › revisión exhaustiva

1 Cita (Scopus)

Resumen

We calculate the form factor of the quark energy momentum tensor and thereby extract the quark orbital angular momentum of the nucleon. The calculation is done on a quenched 16³ × 24 lattice at β = 6.0 and with Wilson fermions at κ = 0.148, 0.152, 0.154 and 0.155. We calculate the disconnected insertion stochastically which employs the Z₂ noise with an unbiased subtraction. This proves to be an efficient method of reduce the error from the noise. We find that the total quark contribution to the proton spin is 0.29 ± 0.07. From this we deduce that the quark orbital angular momentum is 0.17 ± 0.08 and predict the gluon spin to be 0.21 ± 0.07, i.e. about 40% of the proton spin is due to the glue.

Idioma original	English
Páginas (desde-hasta)	247-249
Número de páginas	3
Publicación	Nuclear Physics B - Proceedings Supplements
Volumen	83-84
N.º	1-3
DOI	https://doi.org/10.1016/s0920-5632(00)91637-2
Estado	Published - mar 2000

Financiación

This work is partially supported by DOE Grant No. DE-FG05-84ER40154, DE-FG02-88ER40448 and NSF Grant No. 9722073.

Financiadores	Número del financiador
National Science Foundation Arctic Social Science Program	9722073
U.S. Department of Energy	DE-FG05-84ER40154, DE-FG02-88ER40448

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Nuclear and High Energy Physics

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title = "Proton spin content from lattice QCD",

abstract = "We calculate the form factor of the quark energy momentum tensor and thereby extract the quark orbital angular momentum of the nucleon. The calculation is done on a quenched 163 × 24 lattice at β = 6.0 and with Wilson fermions at κ = 0.148, 0.152, 0.154 and 0.155. We calculate the disconnected insertion stochastically which employs the Z2 noise with an unbiased subtraction. This proves to be an efficient method of reduce the error from the noise. We find that the total quark contribution to the proton spin is 0.29 ± 0.07. From this we deduce that the quark orbital angular momentum is 0.17 ± 0.08 and predict the gluon spin to be 0.21 ± 0.07, i.e. about 40\% of the proton spin is due to the glue.",

author = "Nilmani Mathur and Dong, \{S. J.\} and Liu, \{K. F.\} and Mukhopadhyay, \{N. C.\}",

year = "2000",

month = mar,

doi = "10.1016/s0920-5632(00)91637-2",

language = "English",

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TY - JOUR

T1 - Proton spin content from lattice QCD

AU - Mathur, Nilmani

AU - Dong, S. J.

AU - Liu, K. F.

AU - Mukhopadhyay, N. C.

PY - 2000/3

Y1 - 2000/3

N2 - We calculate the form factor of the quark energy momentum tensor and thereby extract the quark orbital angular momentum of the nucleon. The calculation is done on a quenched 163 × 24 lattice at β = 6.0 and with Wilson fermions at κ = 0.148, 0.152, 0.154 and 0.155. We calculate the disconnected insertion stochastically which employs the Z2 noise with an unbiased subtraction. This proves to be an efficient method of reduce the error from the noise. We find that the total quark contribution to the proton spin is 0.29 ± 0.07. From this we deduce that the quark orbital angular momentum is 0.17 ± 0.08 and predict the gluon spin to be 0.21 ± 0.07, i.e. about 40% of the proton spin is due to the glue.

AB - We calculate the form factor of the quark energy momentum tensor and thereby extract the quark orbital angular momentum of the nucleon. The calculation is done on a quenched 163 × 24 lattice at β = 6.0 and with Wilson fermions at κ = 0.148, 0.152, 0.154 and 0.155. We calculate the disconnected insertion stochastically which employs the Z2 noise with an unbiased subtraction. This proves to be an efficient method of reduce the error from the noise. We find that the total quark contribution to the proton spin is 0.29 ± 0.07. From this we deduce that the quark orbital angular momentum is 0.17 ± 0.08 and predict the gluon spin to be 0.21 ± 0.07, i.e. about 40% of the proton spin is due to the glue.

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DO - 10.1016/s0920-5632(00)91637-2

M3 - Article

AN - SCOPUS:0034147262

SN - 0920-5632

VL - 83-84

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EP - 249

JO - Nuclear Physics B - Proceedings Supplements

JF - Nuclear Physics B - Proceedings Supplements

IS - 1-3

ER -

Proton spin content from lattice QCD

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