On the axial charge and other static properties of the quark core in nucleons

R. Tegen; M. Schedl; W. Weise

doi:10.1016/0370-2693(83)91223-6

On the axial charge and other static properties of the quark core in nucleons

R. Tegen, M. Schedl, W. Weise

University of Regensburg

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

75 Scopus citations

Abstract

We present calculations of the axial vector constant g_A in models where relativistic quarks are confined by scalar potentials, with special emphasis on center-of-mass corrections and pion cloud effects. It is demonstrated that pionic contributions to g_A from a f_πθ{symbol}_μφ term in the axial current vanish for finite pion mass. Confining potentials of the form crⁿ with n = 2, 3 give acceptable values for g_A together with quark core radii between 0.5 and 0.6 fm. We also calculate the pion-nucleon coupling constant and establish a connection between g_A and the quark core part of the magnetic moment, including center-of-mass corrections. About half of the proton magnetic moment is shown to come from the quark core.

Original language	English
Pages (from-to)	9-13
Number of pages	5
Journal	Physics Letters B
Volume	125
Issue number	1
DOIs	https://doi.org/10.1016/0370-2693(83)91223-6
State	Published - 19 May 1983
Externally published	Yes

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title = "On the axial charge and other static properties of the quark core in nucleons",

abstract = "We present calculations of the axial vector constant gA in models where relativistic quarks are confined by scalar potentials, with special emphasis on center-of-mass corrections and pion cloud effects. It is demonstrated that pionic contributions to gA from a fπθ{symbol}μφ term in the axial current vanish for finite pion mass. Confining potentials of the form crn with n = 2, 3 give acceptable values for gA together with quark core radii between 0.5 and 0.6 fm. We also calculate the pion-nucleon coupling constant and establish a connection between gA and the quark core part of the magnetic moment, including center-of-mass corrections. About half of the proton magnetic moment is shown to come from the quark core.",

author = "R. Tegen and M. Schedl and W. Weise",

note = "Funding Information: It cannot be excluded that part of the difficulties to explain gA within bag models is due to the sharp boundary. As an alternative, we consider massless quarks confined in a scalar potential M(r). An ansatz of the form M(r) = cr n with n = 2 or 3 has been used previously to obtain a successful description of the quark core contribution to the proton electric form factor \[1 1\]. This ansatz combines the asymptotic freedom properties in the hadron center with confine- Work supported in part by Deutsche Forschungsgemeinschaft (grant no. We 655/7-5) and by Bundesministerium f'fir For-schung und Technologie (grant no. MEP 3200 X).",

year = "1983",

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doi = "10.1016/0370-2693(83)91223-6",

language = "English",

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T1 - On the axial charge and other static properties of the quark core in nucleons

AU - Tegen, R.

AU - Schedl, M.

AU - Weise, W.

N1 - Funding Information: It cannot be excluded that part of the difficulties to explain gA within bag models is due to the sharp boundary. As an alternative, we consider massless quarks confined in a scalar potential M(r). An ansatz of the form M(r) = cr n with n = 2 or 3 has been used previously to obtain a successful description of the quark core contribution to the proton electric form factor \[1 1\]. This ansatz combines the asymptotic freedom properties in the hadron center with confine- Work supported in part by Deutsche Forschungsgemeinschaft (grant no. We 655/7-5) and by Bundesministerium f'fir For-schung und Technologie (grant no. MEP 3200 X).

PY - 1983/5/19

Y1 - 1983/5/19

N2 - We present calculations of the axial vector constant gA in models where relativistic quarks are confined by scalar potentials, with special emphasis on center-of-mass corrections and pion cloud effects. It is demonstrated that pionic contributions to gA from a fπθ{symbol}μφ term in the axial current vanish for finite pion mass. Confining potentials of the form crn with n = 2, 3 give acceptable values for gA together with quark core radii between 0.5 and 0.6 fm. We also calculate the pion-nucleon coupling constant and establish a connection between gA and the quark core part of the magnetic moment, including center-of-mass corrections. About half of the proton magnetic moment is shown to come from the quark core.

AB - We present calculations of the axial vector constant gA in models where relativistic quarks are confined by scalar potentials, with special emphasis on center-of-mass corrections and pion cloud effects. It is demonstrated that pionic contributions to gA from a fπθ{symbol}μφ term in the axial current vanish for finite pion mass. Confining potentials of the form crn with n = 2, 3 give acceptable values for gA together with quark core radii between 0.5 and 0.6 fm. We also calculate the pion-nucleon coupling constant and establish a connection between gA and the quark core part of the magnetic moment, including center-of-mass corrections. About half of the proton magnetic moment is shown to come from the quark core.

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DO - 10.1016/0370-2693(83)91223-6

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VL - 125

SP - 9

EP - 13

JO - Physics Letters B

JF - Physics Letters B

IS - 1

ER -

On the axial charge and other static properties of the quark core in nucleons

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