The spin structure of a polarized photon

Bass, Steven D.; Brodsky, Stanley J.; Schmidt, Iván

doi:10.1016/s0370-2693(98)00917-4

Cited by 31 publications

(22 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This expectation is based also on the decoupling of gluon axial anomaly from two real photons. Thus, the photon contribution to the axial charge vanishes on-shell, and the first moment of spin-dependent structure function of photon g γ 1 becomes zero as well [43,44] 7 . However, X(1835) should couple to heavy vector currents, i.e.…”

Section: Proton Spin Problem and Glueball X(1835)mentioning

confidence: 99%

X(1835) as the lowest mass pseudoscalar glueball and proton spin problem

Kochelev

Min

2006

Physics Letters B

View full text Add to dashboard Cite

We consider the parity doublet structure observed in high hadronic excitations within the instanton model for the QCD vacuum. In the conventional approach this doubling phenomenon is treated as a manifestation of the partial restoration of chiral or U (1) A symmetry. We demonstrate that the suppression of direct instanton contribution to the masses of excited hadrons leads to the partial U(1) A symmetry restoration in hadron spectrum. The origin of X(1835) resonance observed by BES Collaboration is studied upon the doublet structure. We argue also how X(1835) be interpreted as the lowest pseudoscalar glueball state, and derive its coupling constant to proton. It turns out that this coupling is large and negative. Demonstrated is how this large coupling affects the gluonic contribution to the proton spin.

show abstract

Section: Proton Spin Problem and Glueball X(1835)mentioning

confidence: 99%

X(1835) as the lowest mass pseudoscalar glueball and proton spin problem

Kochelev

Min

2006

Physics Letters B

View full text Add to dashboard Cite

show abstract

“…We have shown g γ 1 (x, Q 2 , P 2 ) in Fig.3, where the NLO g γ 1 corresponds to the solid line, for n f = 3, Q 2 = 30 GeV 2 and P 2 = 1 GeV 2 with Λ = 0.2 GeV. For a real photon (P 2 = 0), the 1st moment vanishes to all orders of α s (Q 2 ) in QCD [ 8]:…”

Section: Structure Functionsmentioning

confidence: 99%

Virtual photon structure functions

Uematsu

2003

Nuclear Physics B - Proceedings Supplements

View full text Add to dashboard Cite

show abstract

“…Note for the real photon target we have the vanishing sum rule [13]. The right-hand side corresponds to the twist-2 contribution, and actually the first term is the consequence of the QED axial anomaly.…”

Section: Qcd Sum Rules With Tmementioning

confidence: 99%

Mass effects in the polarized virtual photon structure

Sasaki

Uematsu

2004

Nuclear Physics B - Proceedings Supplements

View full text Add to dashboard Cite

We discuss target mass effects in the polarized virtual photon structure functions $g_1^\gamma (x,Q^2,P^2)$, $g_2^\gamma (x,Q^2,P^2)$ for the kinematic region $\Lambda^2\ll P^2 \ll Q^2$, where $-Q^2 (-P^2)$ is the mass squared of the probe (target) photon. We obtain the expressions for the structure functions in closed form by inverting the Nachtmann moments for the twist-2 and twist-3 operators. Numerical analysis shows that target mass effects appear at large $x$ and become sizable near the maximal value of $x$, as the ratio $P^2/Q^2$ increases. Target mass effects for the QCD sum rules of $g_1^\gamma$ and $g_2^\gamma$ are also investigated.Comment: 5 pages, LaTeX, 4 eps figures, npb.sty file included, Talk given at Loops and Legs 2004, Zinnowitz, Germany, April 25-30, 2004, to appear in the Proceeding

show abstract

The spin structure of a polarized photon

Cited by 31 publications

References 39 publications

X(1835) as the lowest mass pseudoscalar glueball and proton spin problem

X(1835) as the lowest mass pseudoscalar glueball and proton spin problem

Virtual photon structure functions

Mass effects in the polarized virtual photon structure

Contact Info

Product

Resources

About